/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.view;
import android.animation.AnimatorInflater;
import android.animation.StateListAnimator;
import android.annotation.CallSuper;
import android.annotation.ColorInt;
import android.annotation.DrawableRes;
import android.annotation.FloatRange;
import android.annotation.IdRes;
import android.annotation.IntDef;
import android.annotation.IntRange;
import android.annotation.LayoutRes;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.Size;
import android.annotation.UiThread;
import android.content.ClipData;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.content.res.ColorStateList;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Insets;
import android.graphics.Interpolator;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Outline;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Region;
import android.graphics.Shader;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.hardware.display.DisplayManagerGlobal;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.RemoteException;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.Trace;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.FloatProperty;
import android.util.LayoutDirection;
import android.util.Log;
import android.util.LongSparseLongArray;
import android.util.Pools.SynchronizedPool;
import android.util.Property;
import android.util.SparseArray;
import android.util.StateSet;
import android.util.SuperNotCalledException;
import android.util.TypedValue;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.AccessibilityIterators.CharacterTextSegmentIterator;
import android.view.AccessibilityIterators.ParagraphTextSegmentIterator;
import android.view.AccessibilityIterators.TextSegmentIterator;
import android.view.AccessibilityIterators.WordTextSegmentIterator;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityEventSource;
import android.view.accessibility.AccessibilityManager;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
import android.view.accessibility.AccessibilityNodeProvider;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Transformation;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.Checkable;
import android.widget.FrameLayout;
import android.widget.ScrollBarDrawable;
import static android.os.Build.VERSION_CODES.*;
import static java.lang.Math.max;
import com.android.internal.R;
import com.android.internal.view.menu.MenuBuilder;
import com.android.internal.widget.ScrollBarUtils;
import com.google.android.collect.Lists;
import com.google.android.collect.Maps;
import java.lang.NullPointerException;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.ref.WeakReference;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Predicate;
/**
* <p>
* This class represents the basic building block for user interface components. A View
* occupies a rectangular area on the screen and is responsible for drawing and
* event handling. View is the base class for <em>widgets</em>, which are
* used to create interactive UI components (buttons, text fields, etc.). The
* {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which
* are invisible containers that hold other Views (or other ViewGroups) and define
* their layout properties.
* </p>
*
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For information about using this class to develop your application's user interface,
* read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide.
* </div>
*
* <a name="Using"></a>
* <h3>Using Views</h3>
* <p>
* All of the views in a window are arranged in a single tree. You can add views
* either from code or by specifying a tree of views in one or more XML layout
* files. There are many specialized subclasses of views that act as controls or
* are capable of displaying text, images, or other content.
* </p>
* <p>
* Once you have created a tree of views, there are typically a few types of
* common operations you may wish to perform:
* <ul>
* <li><strong>Set properties:</strong> for example setting the text of a
* {@link android.widget.TextView}. The available properties and the methods
* that set them will vary among the different subclasses of views. Note that
* properties that are known at build time can be set in the XML layout
* files.</li>
* <li><strong>Set focus:</strong> The framework will handle moving focus in
* response to user input. To force focus to a specific view, call
* {@link #requestFocus}.</li>
* <li><strong>Set up listeners:</strong> Views allow clients to set listeners
* that will be notified when something interesting happens to the view. For
* example, all views will let you set a listener to be notified when the view
* gains or loses focus. You can register such a listener using
* {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}.
* Other view subclasses offer more specialized listeners. For example, a Button
* exposes a listener to notify clients when the button is clicked.</li>
* <li><strong>Set visibility:</strong> You can hide or show views using
* {@link #setVisibility(int)}.</li>
* </ul>
* </p>
* <p><em>
* Note: The Android framework is responsible for measuring, laying out and
* drawing views. You should not call methods that perform these actions on
* views yourself unless you are actually implementing a
* {@link android.view.ViewGroup}.
* </em></p>
*
* <a name="Lifecycle"></a>
* <h3>Implementing a Custom View</h3>
*
* <p>
* To implement a custom view, you will usually begin by providing overrides for
* some of the standard methods that the framework calls on all views. You do
* not need to override all of these methods. In fact, you can start by just
* overriding {@link #onDraw(android.graphics.Canvas)}.
* <table border="2" width="85%" align="center" cellpadding="5">
* <thead>
* <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr>
* </thead>
*
* <tbody>
* <tr>
* <td rowspan="2">Creation</td>
* <td>Constructors</td>
* <td>There is a form of the constructor that are called when the view
* is created from code and a form that is called when the view is
* inflated from a layout file. The second form should parse and apply
* any attributes defined in the layout file.
* </td>
* </tr>
* <tr>
* <td><code>{@link #onFinishInflate()}</code></td>
* <td>Called after a view and all of its children has been inflated
* from XML.</td>
* </tr>
*
* <tr>
* <td rowspan="3">Layout</td>
* <td><code>{@link #onMeasure(int, int)}</code></td>
* <td>Called to determine the size requirements for this view and all
* of its children.
* </td>
* </tr>
* <tr>
* <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td>
* <td>Called when this view should assign a size and position to all
* of its children.
* </td>
* </tr>
* <tr>
* <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td>
* <td>Called when the size of this view has changed.
* </td>
* </tr>
*
* <tr>
* <td>Drawing</td>
* <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td>
* <td>Called when the view should render its content.
* </td>
* </tr>
*
* <tr>
* <td rowspan="4">Event processing</td>
* <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td>
* <td>Called when a new hardware key event occurs.
* </td>
* </tr>
* <tr>
* <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td>
* <td>Called when a hardware key up event occurs.
* </td>
* </tr>
* <tr>
* <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td>
* <td>Called when a trackball motion event occurs.
* </td>
* </tr>
* <tr>
* <td><code>{@link #onTouchEvent(MotionEvent)}</code></td>
* <td>Called when a touch screen motion event occurs.
* </td>
* </tr>
*
* <tr>
* <td rowspan="2">Focus</td>
* <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td>
* <td>Called when the view gains or loses focus.
* </td>
* </tr>
*
* <tr>
* <td><code>{@link #onWindowFocusChanged(boolean)}</code></td>
* <td>Called when the window containing the view gains or loses focus.
* </td>
* </tr>
*
* <tr>
* <td rowspan="3">Attaching</td>
* <td><code>{@link #onAttachedToWindow()}</code></td>
* <td>Called when the view is attached to a window.
* </td>
* </tr>
*
* <tr>
* <td><code>{@link #onDetachedFromWindow}</code></td>
* <td>Called when the view is detached from its window.
* </td>
* </tr>
*
* <tr>
* <td><code>{@link #onWindowVisibilityChanged(int)}</code></td>
* <td>Called when the visibility of the window containing the view
* has changed.
* </td>
* </tr>
* </tbody>
*
* </table>
* </p>
*
* <a name="IDs"></a>
* <h3>IDs</h3>
* Views may have an integer id associated with them. These ids are typically
* assigned in the layout XML files, and are used to find specific views within
* the view tree. A common pattern is to:
* <ul>
* <li>Define a Button in the layout file and assign it a unique ID.
* <pre>
* <Button
* android:id="@+id/my_button"
* android:layout_width="wrap_content"
* android:layout_height="wrap_content"
* android:text="@string/my_button_text"/>
* </pre></li>
* <li>From the onCreate method of an Activity, find the Button
* <pre class="prettyprint">
* Button myButton = (Button) findViewById(R.id.my_button);
* </pre></li>
* </ul>
* <p>
* View IDs need not be unique throughout the tree, but it is good practice to
* ensure that they are at least unique within the part of the tree you are
* searching.
* </p>
*
* <a name="Position"></a>
* <h3>Position</h3>
* <p>
* The geometry of a view is that of a rectangle. A view has a location,
* expressed as a pair of <em>left</em> and <em>top</em> coordinates, and
* two dimensions, expressed as a width and a height. The unit for location
* and dimensions is the pixel.
* </p>
*
* <p>
* It is possible to retrieve the location of a view by invoking the methods
* {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X,
* coordinate of the rectangle representing the view. The latter returns the
* top, or Y, coordinate of the rectangle representing the view. These methods
* both return the location of the view relative to its parent. For instance,
* when getLeft() returns 20, that means the view is located 20 pixels to the
* right of the left edge of its direct parent.
* </p>
*
* <p>
* In addition, several convenience methods are offered to avoid unnecessary
* computations, namely {@link #getRight()} and {@link #getBottom()}.
* These methods return the coordinates of the right and bottom edges of the
* rectangle representing the view. For instance, calling {@link #getRight()}
* is similar to the following computation: <code>getLeft() + getWidth()</code>
* (see <a href="#SizePaddingMargins">Size</a> for more information about the width.)
* </p>
*
* <a name="SizePaddingMargins"></a>
* <h3>Size, padding and margins</h3>
* <p>
* The size of a view is expressed with a width and a height. A view actually
* possess two pairs of width and height values.
* </p>
*
* <p>
* The first pair is known as <em>measured width</em> and
* <em>measured height</em>. These dimensions define how big a view wants to be
* within its parent (see <a href="#Layout">Layout</a> for more details.) The
* measured dimensions can be obtained by calling {@link #getMeasuredWidth()}
* and {@link #getMeasuredHeight()}.
* </p>
*
* <p>
* The second pair is simply known as <em>width</em> and <em>height</em>, or
* sometimes <em>drawing width</em> and <em>drawing height</em>. These
* dimensions define the actual size of the view on screen, at drawing time and
* after layout. These values may, but do not have to, be different from the
* measured width and height. The width and height can be obtained by calling
* {@link #getWidth()} and {@link #getHeight()}.
* </p>
*
* <p>
* To measure its dimensions, a view takes into account its padding. The padding
* is expressed in pixels for the left, top, right and bottom parts of the view.
* Padding can be used to offset the content of the view by a specific amount of
* pixels. For instance, a left padding of 2 will push the view's content by
* 2 pixels to the right of the left edge. Padding can be set using the
* {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)}
* method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()},
* {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()},
* {@link #getPaddingEnd()}.
* </p>
*
* <p>
* Even though a view can define a padding, it does not provide any support for
* margins. However, view groups provide such a support. Refer to
* {@link android.view.ViewGroup} and
* {@link android.view.ViewGroup.MarginLayoutParams} for further information.
* </p>
*
* <a name="Layout"></a>
* <h3>Layout</h3>
* <p>
* Layout is a two pass process: a measure pass and a layout pass. The measuring
* pass is implemented in {@link #measure(int, int)} and is a top-down traversal
* of the view tree. Each view pushes dimension specifications down the tree
* during the recursion. At the end of the measure pass, every view has stored
* its measurements. The second pass happens in
* {@link #layout(int,int,int,int)} and is also top-down. During
* this pass each parent is responsible for positioning all of its children
* using the sizes computed in the measure pass.
* </p>
*
* <p>
* When a view's measure() method returns, its {@link #getMeasuredWidth()} and
* {@link #getMeasuredHeight()} values must be set, along with those for all of
* that view's descendants. A view's measured width and measured height values
* must respect the constraints imposed by the view's parents. This guarantees
* that at the end of the measure pass, all parents accept all of their
* children's measurements. A parent view may call measure() more than once on
* its children. For example, the parent may measure each child once with
* unspecified dimensions to find out how big they want to be, then call
* measure() on them again with actual numbers if the sum of all the children's
* unconstrained sizes is too big or too small.
* </p>
*
* <p>
* The measure pass uses two classes to communicate dimensions. The
* {@link MeasureSpec} class is used by views to tell their parents how they
* want to be measured and positioned. The base LayoutParams class just
* describes how big the view wants to be for both width and height. For each
* dimension, it can specify one of:
* <ul>
* <li> an exact number
* <li>MATCH_PARENT, which means the view wants to be as big as its parent
* (minus padding)
* <li> WRAP_CONTENT, which means that the view wants to be just big enough to
* enclose its content (plus padding).
* </ul>
* There are subclasses of LayoutParams for different subclasses of ViewGroup.
* For example, AbsoluteLayout has its own subclass of LayoutParams which adds
* an X and Y value.
* </p>
*
* <p>
* MeasureSpecs are used to push requirements down the tree from parent to
* child. A MeasureSpec can be in one of three modes:
* <ul>
* <li>UNSPECIFIED: This is used by a parent to determine the desired dimension
* of a child view. For example, a LinearLayout may call measure() on its child
* with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how
* tall the child view wants to be given a width of 240 pixels.
* <li>EXACTLY: This is used by the parent to impose an exact size on the
* child. The child must use this size, and guarantee that all of its
* descendants will fit within this size.
* <li>AT_MOST: This is used by the parent to impose a maximum size on the
* child. The child must guarantee that it and all of its descendants will fit
* within this size.
* </ul>
* </p>
*
* <p>
* To initiate a layout, call {@link #requestLayout}. This method is typically
* called by a view on itself when it believes that is can no longer fit within
* its current bounds.
* </p>
*
* <a name="Drawing"></a>
* <h3>Drawing</h3>
* <p>
* Drawing is handled by walking the tree and recording the drawing commands of
* any View that needs to update. After this, the drawing commands of the
* entire tree are issued to screen, clipped to the newly damaged area.
* </p>
*
* <p>
* The tree is largely recorded and drawn in order, with parents drawn before
* (i.e., behind) their children, with siblings drawn in the order they appear
* in the tree. If you set a background drawable for a View, then the View will
* draw it before calling back to its <code>onDraw()</code> method. The child
* drawing order can be overridden with
* {@link ViewGroup#setChildrenDrawingOrderEnabled(boolean) custom child drawing order}
* in a ViewGroup, and with {@link #setZ(float)} custom Z values} set on Views.
* </p>
*
* <p>
* To force a view to draw, call {@link #invalidate()}.
* </p>
*
* <a name="EventHandlingThreading"></a>
* <h3>Event Handling and Threading</h3>
* <p>
* The basic cycle of a view is as follows:
* <ol>
* <li>An event comes in and is dispatched to the appropriate view. The view
* handles the event and notifies any listeners.</li>
* <li>If in the course of processing the event, the view's bounds may need
* to be changed, the view will call {@link #requestLayout()}.</li>
* <li>Similarly, if in the course of processing the event the view's appearance
* may need to be changed, the view will call {@link #invalidate()}.</li>
* <li>If either {@link #requestLayout()} or {@link #invalidate()} were called,
* the framework will take care of measuring, laying out, and drawing the tree
* as appropriate.</li>
* </ol>
* </p>
*
* <p><em>Note: The entire view tree is single threaded. You must always be on
* the UI thread when calling any method on any view.</em>
* If you are doing work on other threads and want to update the state of a view
* from that thread, you should use a {@link Handler}.
* </p>
*
* <a name="FocusHandling"></a>
* <h3>Focus Handling</h3>
* <p>
* The framework will handle routine focus movement in response to user input.
* This includes changing the focus as views are removed or hidden, or as new
* views become available. Views indicate their willingness to take focus
* through the {@link #isFocusable} method. To change whether a view can take
* focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below)
* views indicate whether they still would like focus via {@link #isFocusableInTouchMode}
* and can change this via {@link #setFocusableInTouchMode(boolean)}.
* </p>
* <p>
* Focus movement is based on an algorithm which finds the nearest neighbor in a
* given direction. In rare cases, the default algorithm may not match the
* intended behavior of the developer. In these situations, you can provide
* explicit overrides by using these XML attributes in the layout file:
* <pre>
* nextFocusDown
* nextFocusLeft
* nextFocusRight
* nextFocusUp
* </pre>
* </p>
*
*
* <p>
* To get a particular view to take focus, call {@link #requestFocus()}.
* </p>
*
* <a name="TouchMode"></a>
* <h3>Touch Mode</h3>
* <p>
* When a user is navigating a user interface via directional keys such as a D-pad, it is
* necessary to give focus to actionable items such as buttons so the user can see
* what will take input. If the device has touch capabilities, however, and the user
* begins interacting with the interface by touching it, it is no longer necessary to
* always highlight, or give focus to, a particular view. This motivates a mode
* for interaction named 'touch mode'.
* </p>
* <p>
* For a touch capable device, once the user touches the screen, the device
* will enter touch mode. From this point onward, only views for which
* {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets.
* Other views that are touchable, like buttons, will not take focus when touched; they will
* only fire the on click listeners.
* </p>
* <p>
* Any time a user hits a directional key, such as a D-pad direction, the view device will
* exit touch mode, and find a view to take focus, so that the user may resume interacting
* with the user interface without touching the screen again.
* </p>
* <p>
* The touch mode state is maintained across {@link android.app.Activity}s. Call
* {@link #isInTouchMode} to see whether the device is currently in touch mode.
* </p>
*
* <a name="Scrolling"></a>
* <h3>Scrolling</h3>
* <p>
* The framework provides basic support for views that wish to internally
* scroll their content. This includes keeping track of the X and Y scroll
* offset as well as mechanisms for drawing scrollbars. See
* {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and
* {@link #awakenScrollBars()} for more details.
* </p>
*
* <a name="Tags"></a>
* <h3>Tags</h3>
* <p>
* Unlike IDs, tags are not used to identify views. Tags are essentially an
* extra piece of information that can be associated with a view. They are most
* often used as a convenience to store data related to views in the views
* themselves rather than by putting them in a separate structure.
* </p>
* <p>
* Tags may be specified with character sequence values in layout XML as either
* a single tag using the {@link android.R.styleable#View_tag android:tag}
* attribute or multiple tags using the {@code <tag>} child element:
* <pre>
* <View ...
* android:tag="@string/mytag_value" />
* <View ...>
* <tag android:id="@+id/mytag"
* android:value="@string/mytag_value" />
* </View>
* </pre>
* </p>
* <p>
* Tags may also be specified with arbitrary objects from code using
* {@link #setTag(Object)} or {@link #setTag(int, Object)}.
* </p>
*
* <a name="Themes"></a>
* <h3>Themes</h3>
* <p>
* By default, Views are created using the theme of the Context object supplied
* to their constructor; however, a different theme may be specified by using
* the {@link android.R.styleable#View_theme android:theme} attribute in layout
* XML or by passing a {@link ContextThemeWrapper} to the constructor from
* code.
* </p>
* <p>
* When the {@link android.R.styleable#View_theme android:theme} attribute is
* used in XML, the specified theme is applied on top of the inflation
* context's theme (see {@link LayoutInflater}) and used for the view itself as
* well as any child elements.
* </p>
* <p>
* In the following example, both views will be created using the Material dark
* color scheme; however, because an overlay theme is used which only defines a
* subset of attributes, the value of
* {@link android.R.styleable#Theme_colorAccent android:colorAccent} defined on
* the inflation context's theme (e.g. the Activity theme) will be preserved.
* <pre>
* <LinearLayout
* ...
* android:theme="@android:theme/ThemeOverlay.Material.Dark">
* <View ...>
* </LinearLayout>
* </pre>
* </p>
*
* <a name="Properties"></a>
* <h3>Properties</h3>
* <p>
* The View class exposes an {@link #ALPHA} property, as well as several transform-related
* properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are
* available both in the {@link Property} form as well as in similarly-named setter/getter
* methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can
* be used to set persistent state associated with these rendering-related properties on the view.
* The properties and methods can also be used in conjunction with
* {@link android.animation.Animator Animator}-based animations, described more in the
* <a href="#Animation">Animation</a> section.
* </p>
*
* <a name="Animation"></a>
* <h3>Animation</h3>
* <p>
* Starting with Android 3.0, the preferred way of animating views is to use the
* {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based
* classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and
* {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0
* {@link android.view.animation.Animation Animation}-based classes, which instead animate only
* how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class
* makes animating these View properties particularly easy and efficient.
* </p>
* <p>
* Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered.
* You can attach an {@link Animation} object to a view using
* {@link #setAnimation(Animation)} or
* {@link #startAnimation(Animation)}. The animation can alter the scale,
* rotation, translation and alpha of a view over time. If the animation is
* attached to a view that has children, the animation will affect the entire
* subtree rooted by that node. When an animation is started, the framework will
* take care of redrawing the appropriate views until the animation completes.
* </p>
*
* <a name="Security"></a>
* <h3>Security</h3>
* <p>
* Sometimes it is essential that an application be able to verify that an action
* is being performed with the full knowledge and consent of the user, such as
* granting a permission request, making a purchase or clicking on an advertisement.
* Unfortunately, a malicious application could try to spoof the user into
* performing these actions, unaware, by concealing the intended purpose of the view.
* As a remedy, the framework offers a touch filtering mechanism that can be used to
* improve the security of views that provide access to sensitive functionality.
* </p><p>
* To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the
* android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework
* will discard touches that are received whenever the view's window is obscured by
* another visible window. As a result, the view will not receive touches whenever a
* toast, dialog or other window appears above the view's window.
* </p><p>
* For more fine-grained control over security, consider overriding the
* {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own
* security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}.
* </p>
*
* @attr ref android.R.styleable#View_alpha
* @attr ref android.R.styleable#View_background
* @attr ref android.R.styleable#View_clickable
* @attr ref android.R.styleable#View_contentDescription
* @attr ref android.R.styleable#View_drawingCacheQuality
* @attr ref android.R.styleable#View_duplicateParentState
* @attr ref android.R.styleable#View_id
* @attr ref android.R.styleable#View_requiresFadingEdge
* @attr ref android.R.styleable#View_fadeScrollbars
* @attr ref android.R.styleable#View_fadingEdgeLength
* @attr ref android.R.styleable#View_filterTouchesWhenObscured
* @attr ref android.R.styleable#View_fitsSystemWindows
* @attr ref android.R.styleable#View_isScrollContainer
* @attr ref android.R.styleable#View_focusable
* @attr ref android.R.styleable#View_focusableInTouchMode
* @attr ref android.R.styleable#View_hapticFeedbackEnabled
* @attr ref android.R.styleable#View_keepScreenOn
* @attr ref android.R.styleable#View_layerType
* @attr ref android.R.styleable#View_layoutDirection
* @attr ref android.R.styleable#View_longClickable
* @attr ref android.R.styleable#View_minHeight
* @attr ref android.R.styleable#View_minWidth
* @attr ref android.R.styleable#View_nextFocusDown
* @attr ref android.R.styleable#View_nextFocusLeft
* @attr ref android.R.styleable#View_nextFocusRight
* @attr ref android.R.styleable#View_nextFocusUp
* @attr ref android.R.styleable#View_onClick
* @attr ref android.R.styleable#View_padding
* @attr ref android.R.styleable#View_paddingBottom
* @attr ref android.R.styleable#View_paddingLeft
* @attr ref android.R.styleable#View_paddingRight
* @attr ref android.R.styleable#View_paddingTop
* @attr ref android.R.styleable#View_paddingStart
* @attr ref android.R.styleable#View_paddingEnd
* @attr ref android.R.styleable#View_saveEnabled
* @attr ref android.R.styleable#View_rotation
* @attr ref android.R.styleable#View_rotationX
* @attr ref android.R.styleable#View_rotationY
* @attr ref android.R.styleable#View_scaleX
* @attr ref android.R.styleable#View_scaleY
* @attr ref android.R.styleable#View_scrollX
* @attr ref android.R.styleable#View_scrollY
* @attr ref android.R.styleable#View_scrollbarSize
* @attr ref android.R.styleable#View_scrollbarStyle
* @attr ref android.R.styleable#View_scrollbars
* @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
* @attr ref android.R.styleable#View_scrollbarFadeDuration
* @attr ref android.R.styleable#View_scrollbarTrackHorizontal
* @attr ref android.R.styleable#View_scrollbarThumbHorizontal
* @attr ref android.R.styleable#View_scrollbarThumbVertical
* @attr ref android.R.styleable#View_scrollbarTrackVertical
* @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack
* @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack
* @attr ref android.R.styleable#View_stateListAnimator
* @attr ref android.R.styleable#View_transitionName
* @attr ref android.R.styleable#View_soundEffectsEnabled
* @attr ref android.R.styleable#View_tag
* @attr ref android.R.styleable#View_textAlignment
* @attr ref android.R.styleable#View_textDirection
* @attr ref android.R.styleable#View_transformPivotX
* @attr ref android.R.styleable#View_transformPivotY
* @attr ref android.R.styleable#View_translationX
* @attr ref android.R.styleable#View_translationY
* @attr ref android.R.styleable#View_translationZ
* @attr ref android.R.styleable#View_visibility
* @attr ref android.R.styleable#View_theme
*
* @see android.view.ViewGroup
*/
@UiThread
public class View implements Drawable.Callback, KeyEvent.Callback,
AccessibilityEventSource {
private static final boolean DBG = false;
/**
* The logging tag used by this class with android.util.Log.
*/
protected static final String VIEW_LOG_TAG = "View";
/**
* When set to true, apps will draw debugging information about their layouts.
*
* @hide
*/
public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout";
/**
* When set to true, this view will save its attribute data.
*
* @hide
*/
public static boolean mDebugViewAttributes = false;
/**
* Used to mark a View that has no ID.
*/
public static final int NO_ID = -1;
/**
* Signals that compatibility booleans have been initialized according to
* target SDK versions.
*/
private static boolean sCompatibilityDone = false;
/**
* Use the old (broken) way of building MeasureSpecs.
*/
private static boolean sUseBrokenMakeMeasureSpec = false;
/**
* Always return a size of 0 for MeasureSpec values with a mode of UNSPECIFIED
*/
static boolean sUseZeroUnspecifiedMeasureSpec = false;
/**
* Ignore any optimizations using the measure cache.
*/
private static boolean sIgnoreMeasureCache = false;
/**
* Ignore an optimization that skips unnecessary EXACTLY layout passes.
*/
private static boolean sAlwaysRemeasureExactly = false;
/**
* Relax constraints around whether setLayoutParams() must be called after
* modifying the layout params.
*/
private static boolean sLayoutParamsAlwaysChanged = false;
/**
* Allow setForeground/setBackground to be called (and ignored) on a textureview,
* without throwing
*/
static boolean sTextureViewIgnoresDrawableSetters = false;
/**
* Prior to N, some ViewGroups would not convert LayoutParams properly even though both extend
* MarginLayoutParams. For instance, converting LinearLayout.LayoutParams to
* RelativeLayout.LayoutParams would lose margin information. This is fixed on N but target API
* check is implemented for backwards compatibility.
*
* {@hide}
*/
protected static boolean sPreserveMarginParamsInLayoutParamConversion;
/**
* Prior to N, when drag enters into child of a view that has already received an
* ACTION_DRAG_ENTERED event, the parent doesn't get a ACTION_DRAG_EXITED event.
* ACTION_DRAG_LOCATION and ACTION_DROP were delivered to the parent of a view that returned
* false from its event handler for these events.
* Starting from N, the parent will get ACTION_DRAG_EXITED event before the child gets its
* ACTION_DRAG_ENTERED. ACTION_DRAG_LOCATION and ACTION_DROP are never propagated to the parent.
* sCascadedDragDrop is true for pre-N apps for backwards compatibility implementation.
*/
static boolean sCascadedDragDrop;
/**
* This view does not want keystrokes. Use with TAKES_FOCUS_MASK when
* calling setFlags.
*/
private static final int NOT_FOCUSABLE = 0x00000000;
/**
* This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling
* setFlags.
*/
private static final int FOCUSABLE = 0x00000001;
/**
* Mask for use with setFlags indicating bits used for focus.
*/
private static final int FOCUSABLE_MASK = 0x00000001;
/**
* This view will adjust its padding to fit sytem windows (e.g. status bar)
*/
private static final int FITS_SYSTEM_WINDOWS = 0x00000002;
/** @hide */
@IntDef({VISIBLE, INVISIBLE, GONE})
@Retention(RetentionPolicy.SOURCE)
public @interface Visibility {}
/**
* This view is visible.
* Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
* android:visibility}.
*/
public static final int VISIBLE = 0x00000000;
/**
* This view is invisible, but it still takes up space for layout purposes.
* Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
* android:visibility}.
*/
public static final int INVISIBLE = 0x00000004;
/**
* This view is invisible, and it doesn't take any space for layout
* purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code
* android:visibility}.
*/
public static final int GONE = 0x00000008;
/**
* Mask for use with setFlags indicating bits used for visibility.
* {@hide}
*/
static final int VISIBILITY_MASK = 0x0000000C;
private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE};
/**
* This view is enabled. Interpretation varies by subclass.
* Use with ENABLED_MASK when calling setFlags.
* {@hide}
*/
static final int ENABLED = 0x00000000;
/**
* This view is disabled. Interpretation varies by subclass.
* Use with ENABLED_MASK when calling setFlags.
* {@hide}
*/
static final int DISABLED = 0x00000020;
/**
* Mask for use with setFlags indicating bits used for indicating whether
* this view is enabled
* {@hide}
*/
static final int ENABLED_MASK = 0x00000020;
/**
* This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be
* called and further optimizations will be performed. It is okay to have
* this flag set and a background. Use with DRAW_MASK when calling setFlags.
* {@hide}
*/
static final int WILL_NOT_DRAW = 0x00000080;
/**
* Mask for use with setFlags indicating bits used for indicating whether
* this view is will draw
* {@hide}
*/
static final int DRAW_MASK = 0x00000080;
/**
* <p>This view doesn't show scrollbars.</p>
* {@hide}
*/
static final int SCROLLBARS_NONE = 0x00000000;
/**
* <p>This view shows horizontal scrollbars.</p>
* {@hide}
*/
static final int SCROLLBARS_HORIZONTAL = 0x00000100;
/**
* <p>This view shows vertical scrollbars.</p>
* {@hide}
*/
static final int SCROLLBARS_VERTICAL = 0x00000200;
/**
* <p>Mask for use with setFlags indicating bits used for indicating which
* scrollbars are enabled.</p>
* {@hide}
*/
static final int SCROLLBARS_MASK = 0x00000300;
/**
* Indicates that the view should filter touches when its window is obscured.
* Refer to the class comments for more information about this security feature.
* {@hide}
*/
static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400;
/**
* Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate
* that they are optional and should be skipped if the window has
* requested system UI flags that ignore those insets for layout.
*/
static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800;
/**
* <p>This view doesn't show fading edges.</p>
* {@hide}
*/
static final int FADING_EDGE_NONE = 0x00000000;
/**
* <p>This view shows horizontal fading edges.</p>
* {@hide}
*/
static final int FADING_EDGE_HORIZONTAL = 0x00001000;
/**
* <p>This view shows vertical fading edges.</p>
* {@hide}
*/
static final int FADING_EDGE_VERTICAL = 0x00002000;
/**
* <p>Mask for use with setFlags indicating bits used for indicating which
* fading edges are enabled.</p>
* {@hide}
*/
static final int FADING_EDGE_MASK = 0x00003000;
/**
* <p>Indicates this view can be clicked. When clickable, a View reacts
* to clicks by notifying the OnClickListener.<p>
* {@hide}
*/
static final int CLICKABLE = 0x00004000;
/**
* <p>Indicates this view is caching its drawing into a bitmap.</p>
* {@hide}
*/
static final int DRAWING_CACHE_ENABLED = 0x00008000;
/**
* <p>Indicates that no icicle should be saved for this view.<p>
* {@hide}
*/
static final int SAVE_DISABLED = 0x000010000;
/**
* <p>Mask for use with setFlags indicating bits used for the saveEnabled
* property.</p>
* {@hide}
*/
static final int SAVE_DISABLED_MASK = 0x000010000;
/**
* <p>Indicates that no drawing cache should ever be created for this view.<p>
* {@hide}
*/
static final int WILL_NOT_CACHE_DRAWING = 0x000020000;
/**
* <p>Indicates this view can take / keep focus when int touch mode.</p>
* {@hide}
*/
static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000;
/** @hide */
@Retention(RetentionPolicy.SOURCE)
@IntDef({DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH, DRAWING_CACHE_QUALITY_AUTO})
public @interface DrawingCacheQuality {}
/**
* <p>Enables low quality mode for the drawing cache.</p>
*/
public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000;
/**
* <p>Enables high quality mode for the drawing cache.</p>
*/
public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000;
/**
* <p>Enables automatic quality mode for the drawing cache.</p>
*/
public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000;
private static final int[] DRAWING_CACHE_QUALITY_FLAGS = {
DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH
};
/**
* <p>Mask for use with setFlags indicating bits used for the cache
* quality property.</p>
* {@hide}
*/
static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000;
/**
* <p>
* Indicates this view can be long clicked. When long clickable, a View
* reacts to long clicks by notifying the OnLongClickListener or showing a
* context menu.
* </p>
* {@hide}
*/
static final int LONG_CLICKABLE = 0x00200000;
/**
* <p>Indicates that this view gets its drawable states from its direct parent
* and ignores its original internal states.</p>
*
* @hide
*/
static final int DUPLICATE_PARENT_STATE = 0x00400000;
/**
* <p>
* Indicates this view can be context clicked. When context clickable, a View reacts to a
* context click (e.g. a primary stylus button press or right mouse click) by notifying the
* OnContextClickListener.
* </p>
* {@hide}
*/
static final int CONTEXT_CLICKABLE = 0x00800000;
/** @hide */
@IntDef({
SCROLLBARS_INSIDE_OVERLAY,
SCROLLBARS_INSIDE_INSET,
SCROLLBARS_OUTSIDE_OVERLAY,
SCROLLBARS_OUTSIDE_INSET
})
@Retention(RetentionPolicy.SOURCE)
public @interface ScrollBarStyle {}
/**
* The scrollbar style to display the scrollbars inside the content area,
* without increasing the padding. The scrollbars will be overlaid with
* translucency on the view's content.
*/
public static final int SCROLLBARS_INSIDE_OVERLAY = 0;
/**
* The scrollbar style to display the scrollbars inside the padded area,
* increasing the padding of the view. The scrollbars will not overlap the
* content area of the view.
*/
public static final int SCROLLBARS_INSIDE_INSET = 0x01000000;
/**
* The scrollbar style to display the scrollbars at the edge of the view,
* without increasing the padding. The scrollbars will be overlaid with
* translucency.
*/
public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000;
/**
* The scrollbar style to display the scrollbars at the edge of the view,
* increasing the padding of the view. The scrollbars will only overlap the
* background, if any.
*/
public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000;
/**
* Mask to check if the scrollbar style is overlay or inset.
* {@hide}
*/
static final int SCROLLBARS_INSET_MASK = 0x01000000;
/**
* Mask to check if the scrollbar style is inside or outside.
* {@hide}
*/
static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000;
/**
* Mask for scrollbar style.
* {@hide}
*/
static final int SCROLLBARS_STYLE_MASK = 0x03000000;
/**
* View flag indicating that the screen should remain on while the
* window containing this view is visible to the user. This effectively
* takes care of automatically setting the WindowManager's
* {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}.
*/
public static final int KEEP_SCREEN_ON = 0x04000000;
/**
* View flag indicating whether this view should have sound effects enabled
* for events such as clicking and touching.
*/
public static final int SOUND_EFFECTS_ENABLED = 0x08000000;
/**
* View flag indicating whether this view should have haptic feedback
* enabled for events such as long presses.
*/
public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000;
/**
* <p>Indicates that the view hierarchy should stop saving state when
* it reaches this view. If state saving is initiated immediately at
* the view, it will be allowed.
* {@hide}
*/
static final int PARENT_SAVE_DISABLED = 0x20000000;
/**
* <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p>
* {@hide}
*/
static final int PARENT_SAVE_DISABLED_MASK = 0x20000000;
/** @hide */
@IntDef(flag = true,
value = {
FOCUSABLES_ALL,
FOCUSABLES_TOUCH_MODE
})
@Retention(RetentionPolicy.SOURCE)
public @interface FocusableMode {}
/**
* View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
* should add all focusable Views regardless if they are focusable in touch mode.
*/
public static final int FOCUSABLES_ALL = 0x00000000;
/**
* View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
* should add only Views focusable in touch mode.
*/
public static final int FOCUSABLES_TOUCH_MODE = 0x00000001;
/** @hide */
@IntDef({
FOCUS_BACKWARD,
FOCUS_FORWARD,
FOCUS_LEFT,
FOCUS_UP,
FOCUS_RIGHT,
FOCUS_DOWN
})
@Retention(RetentionPolicy.SOURCE)
public @interface FocusDirection {}
/** @hide */
@IntDef({
FOCUS_LEFT,
FOCUS_UP,
FOCUS_RIGHT,
FOCUS_DOWN
})
@Retention(RetentionPolicy.SOURCE)
public @interface FocusRealDirection {} // Like @FocusDirection, but without forward/backward
/**
* Use with {@link #focusSearch(int)}. Move focus to the previous selectable
* item.
*/
public static final int FOCUS_BACKWARD = 0x00000001;
/**
* Use with {@link #focusSearch(int)}. Move focus to the next selectable
* item.
*/
public static final int FOCUS_FORWARD = 0x00000002;
/**
* Use with {@link #focusSearch(int)}. Move focus to the left.
*/
public static final int FOCUS_LEFT = 0x00000011;
/**
* Use with {@link #focusSearch(int)}. Move focus up.
*/
public static final int FOCUS_UP = 0x00000021;
/**
* Use with {@link #focusSearch(int)}. Move focus to the right.
*/
public static final int FOCUS_RIGHT = 0x00000042;
/**
* Use with {@link #focusSearch(int)}. Move focus down.
*/
public static final int FOCUS_DOWN = 0x00000082;
/**
* Bits of {@link #getMeasuredWidthAndState()} and
* {@link #getMeasuredWidthAndState()} that provide the actual measured size.
*/
public static final int MEASURED_SIZE_MASK = 0x00ffffff;
/**
* Bits of {@link #getMeasuredWidthAndState()} and
* {@link #getMeasuredWidthAndState()} that provide the additional state bits.
*/
public static final int MEASURED_STATE_MASK = 0xff000000;
/**
* Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits
* for functions that combine both width and height into a single int,
* such as {@link #getMeasuredState()} and the childState argument of
* {@link #resolveSizeAndState(int, int, int)}.
*/
public static final int MEASURED_HEIGHT_STATE_SHIFT = 16;
/**
* Bit of {@link #getMeasuredWidthAndState()} and
* {@link #getMeasuredWidthAndState()} that indicates the measured size
* is smaller that the space the view would like to have.
*/
public static final int MEASURED_STATE_TOO_SMALL = 0x01000000;
/**
* Base View state sets
*/
// Singles
/**
* Indicates the view has no states set. States are used with
* {@link android.graphics.drawable.Drawable} to change the drawing of the
* view depending on its state.
*
* @see android.graphics.drawable.Drawable
* @see #getDrawableState()
*/
protected static final int[] EMPTY_STATE_SET;
/**
* Indicates the view is enabled. States are used with
* {@link android.graphics.drawable.Drawable} to change the drawing of the
* view depending on its state.
*
* @see android.graphics.drawable.Drawable
* @see #getDrawableState()
*/
protected static final int[] ENABLED_STATE_SET;
/**
* Indicates the view is focused. States are used with
* {@link android.graphics.drawable.Drawable} to change the drawing of the
* view depending on its state.
*
* @see android.graphics.drawable.Drawable
* @see #getDrawableState()
*/
protected static final int[] FOCUSED_STATE_SET;
/**
* Indicates the view is selected. States are used with
* {@link android.graphics.drawable.Drawable} to change the drawing of the
* view depending on its state.
*
* @see android.graphics.drawable.Drawable
* @see #getDrawableState()
*/
protected static final int[] SELECTED_STATE_SET;
/**
* Indicates the view is pressed. States are used with
* {@link android.graphics.drawable.Drawable} to change the drawing of the
* view depending on its state.
*
* @see android.graphics.drawable.Drawable
* @see #getDrawableState()
*/
protected static final int[] PRESSED_STATE_SET;
/**
* Indicates the view's window has focus. States are used with
* {@link android.graphics.drawable.Drawable} to change the drawing of the
* view depending on its state.
*
* @see android.graphics.drawable.Drawable
* @see #getDrawableState()
*/
protected static final int[] WINDOW_FOCUSED_STATE_SET;
// Doubles
/**
* Indicates the view is enabled and has the focus.
*
* @see #ENABLED_STATE_SET
* @see #FOCUSED_STATE_SET
*/
protected static final int[] ENABLED_FOCUSED_STATE_SET;
/**
* Indicates the view is enabled and selected.
*
* @see #ENABLED_STATE_SET
* @see #SELECTED_STATE_SET
*/
protected static final int[] ENABLED_SELECTED_STATE_SET;
/**
* Indicates the view is enabled and that its window has focus.
*
* @see #ENABLED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is focused and selected.
*
* @see #FOCUSED_STATE_SET
* @see #SELECTED_STATE_SET
*/
protected static final int[] FOCUSED_SELECTED_STATE_SET;
/**
* Indicates the view has the focus and that its window has the focus.
*
* @see #FOCUSED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is selected and that its window has the focus.
*
* @see #SELECTED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET;
// Triples
/**
* Indicates the view is enabled, focused and selected.
*
* @see #ENABLED_STATE_SET
* @see #FOCUSED_STATE_SET
* @see #SELECTED_STATE_SET
*/
protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET;
/**
* Indicates the view is enabled, focused and its window has the focus.
*
* @see #ENABLED_STATE_SET
* @see #FOCUSED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is enabled, selected and its window has the focus.
*
* @see #ENABLED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is focused, selected and its window has the focus.
*
* @see #FOCUSED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is enabled, focused, selected and its window
* has the focus.
*
* @see #ENABLED_STATE_SET
* @see #FOCUSED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed and its window has the focus.
*
* @see #PRESSED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed and selected.
*
* @see #PRESSED_STATE_SET
* @see #SELECTED_STATE_SET
*/
protected static final int[] PRESSED_SELECTED_STATE_SET;
/**
* Indicates the view is pressed, selected and its window has the focus.
*
* @see #PRESSED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed and focused.
*
* @see #PRESSED_STATE_SET
* @see #FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed, focused and its window has the focus.
*
* @see #PRESSED_STATE_SET
* @see #FOCUSED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed, focused and selected.
*
* @see #PRESSED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET;
/**
* Indicates the view is pressed, focused, selected and its window has the focus.
*
* @see #PRESSED_STATE_SET
* @see #FOCUSED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed and enabled.
*
* @see #PRESSED_STATE_SET
* @see #ENABLED_STATE_SET
*/
protected static final int[] PRESSED_ENABLED_STATE_SET;
/**
* Indicates the view is pressed, enabled and its window has the focus.
*
* @see #PRESSED_STATE_SET
* @see #ENABLED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed, enabled and selected.
*
* @see #PRESSED_STATE_SET
* @see #ENABLED_STATE_SET
* @see #SELECTED_STATE_SET
*/
protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET;
/**
* Indicates the view is pressed, enabled, selected and its window has the
* focus.
*
* @see #PRESSED_STATE_SET
* @see #ENABLED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed, enabled and focused.
*
* @see #PRESSED_STATE_SET
* @see #ENABLED_STATE_SET
* @see #FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed, enabled, focused and its window has the
* focus.
*
* @see #PRESSED_STATE_SET
* @see #ENABLED_STATE_SET
* @see #FOCUSED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET;
/**
* Indicates the view is pressed, enabled, focused and selected.
*
* @see #PRESSED_STATE_SET
* @see #ENABLED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET;
/**
* Indicates the view is pressed, enabled, focused, selected and its window
* has the focus.
*
* @see #PRESSED_STATE_SET
* @see #ENABLED_STATE_SET
* @see #SELECTED_STATE_SET
* @see #FOCUSED_STATE_SET
* @see #WINDOW_FOCUSED_STATE_SET
*/
protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET;
static {
EMPTY_STATE_SET = StateSet.get(0);
WINDOW_FOCUSED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_WINDOW_FOCUSED);
SELECTED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_SELECTED);
SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED);
FOCUSED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_FOCUSED);
FOCUSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_FOCUSED);
FOCUSED_SELECTED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_FOCUSED);
FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
| StateSet.VIEW_STATE_FOCUSED);
ENABLED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_ENABLED);
ENABLED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_ENABLED);
ENABLED_SELECTED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_ENABLED);
ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
| StateSet.VIEW_STATE_ENABLED);
ENABLED_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_FOCUSED | StateSet.VIEW_STATE_ENABLED);
ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_FOCUSED
| StateSet.VIEW_STATE_ENABLED);
ENABLED_FOCUSED_SELECTED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_FOCUSED
| StateSet.VIEW_STATE_ENABLED);
ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
| StateSet.VIEW_STATE_FOCUSED| StateSet.VIEW_STATE_ENABLED);
PRESSED_STATE_SET = StateSet.get(StateSet.VIEW_STATE_PRESSED);
PRESSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_PRESSED);
PRESSED_SELECTED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_PRESSED);
PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
| StateSet.VIEW_STATE_PRESSED);
PRESSED_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_FOCUSED | StateSet.VIEW_STATE_PRESSED);
PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_FOCUSED
| StateSet.VIEW_STATE_PRESSED);
PRESSED_FOCUSED_SELECTED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_FOCUSED
| StateSet.VIEW_STATE_PRESSED);
PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
| StateSet.VIEW_STATE_FOCUSED | StateSet.VIEW_STATE_PRESSED);
PRESSED_ENABLED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_PRESSED);
PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_ENABLED
| StateSet.VIEW_STATE_PRESSED);
PRESSED_ENABLED_SELECTED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_ENABLED
| StateSet.VIEW_STATE_PRESSED);
PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
| StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_PRESSED);
PRESSED_ENABLED_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_FOCUSED | StateSet.VIEW_STATE_ENABLED
| StateSet.VIEW_STATE_PRESSED);
PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_FOCUSED
| StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_PRESSED);
PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_SELECTED | StateSet.VIEW_STATE_FOCUSED
| StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_PRESSED);
PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = StateSet.get(
StateSet.VIEW_STATE_WINDOW_FOCUSED | StateSet.VIEW_STATE_SELECTED
| StateSet.VIEW_STATE_FOCUSED| StateSet.VIEW_STATE_ENABLED
| StateSet.VIEW_STATE_PRESSED);
}
/**
* Accessibility event types that are dispatched for text population.
*/
private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES =
AccessibilityEvent.TYPE_VIEW_CLICKED
| AccessibilityEvent.TYPE_VIEW_LONG_CLICKED
| AccessibilityEvent.TYPE_VIEW_SELECTED
| AccessibilityEvent.TYPE_VIEW_FOCUSED
| AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED
| AccessibilityEvent.TYPE_VIEW_HOVER_ENTER
| AccessibilityEvent.TYPE_VIEW_HOVER_EXIT
| AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED
| AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED
| AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED
| AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY;
/**
* Temporary Rect currently for use in setBackground(). This will probably
* be extended in the future to hold our own class with more than just
* a Rect. :)
*/
static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>();
/**
* Map used to store views' tags.
*/
private SparseArray<Object> mKeyedTags;
/**
* The next available accessibility id.
*/
private static int sNextAccessibilityViewId;
/**
* The animation currently associated with this view.
* @hide
*/
protected Animation mCurrentAnimation = null;
/**
* Width as measured during measure pass.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "measurement")
int mMeasuredWidth;
/**
* Height as measured during measure pass.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "measurement")
int mMeasuredHeight;
/**
* Flag to indicate that this view was marked INVALIDATED, or had its display list
* invalidated, prior to the current drawing iteration. If true, the view must re-draw
* its display list. This flag, used only when hw accelerated, allows us to clear the
* flag while retaining this information until it's needed (at getDisplayList() time and
* in drawChild(), when we decide to draw a view's children's display lists into our own).
*
* {@hide}
*/
boolean mRecreateDisplayList = false;
/**
* The view's identifier.
* {@hide}
*
* @see #setId(int)
* @see #getId()
*/
@IdRes
@ViewDebug.ExportedProperty(resolveId = true)
int mID = NO_ID;
/**
* The stable ID of this view for accessibility purposes.
*/
int mAccessibilityViewId = NO_ID;
private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED;
SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent;
/**
* The view's tag.
* {@hide}
*
* @see #setTag(Object)
* @see #getTag()
*/
protected Object mTag = null;
// for mPrivateFlags:
/** {@hide} */
static final int PFLAG_WANTS_FOCUS = 0x00000001;
/** {@hide} */
static final int PFLAG_FOCUSED = 0x00000002;
/** {@hide} */
static final int PFLAG_SELECTED = 0x00000004;
/** {@hide} */
static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008;
/** {@hide} */
static final int PFLAG_HAS_BOUNDS = 0x00000010;
/** {@hide} */
static final int PFLAG_DRAWN = 0x00000020;
/**
* When this flag is set, this view is running an animation on behalf of its
* children and should therefore not cancel invalidate requests, even if they
* lie outside of this view's bounds.
*
* {@hide}
*/
static final int PFLAG_DRAW_ANIMATION = 0x00000040;
/** {@hide} */
static final int PFLAG_SKIP_DRAW = 0x00000080;
/** {@hide} */
static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200;
/** {@hide} */
static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400;
/** {@hide} */
static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800;
/** {@hide} */
static final int PFLAG_FORCE_LAYOUT = 0x00001000;
/** {@hide} */
static final int PFLAG_LAYOUT_REQUIRED = 0x00002000;
private static final int PFLAG_PRESSED = 0x00004000;
/** {@hide} */
static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000;
/**
* Flag used to indicate that this view should be drawn once more (and only once
* more) after its animation has completed.
* {@hide}
*/
static final int PFLAG_ANIMATION_STARTED = 0x00010000;
private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000;
/**
* Indicates that the View returned true when onSetAlpha() was called and that
* the alpha must be restored.
* {@hide}
*/
static final int PFLAG_ALPHA_SET = 0x00040000;
/**
* Set by {@link #setScrollContainer(boolean)}.
*/
static final int PFLAG_SCROLL_CONTAINER = 0x00080000;
/**
* Set by {@link #setScrollContainer(boolean)}.
*/
static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000;
/**
* View flag indicating whether this view was invalidated (fully or partially.)
*
* @hide
*/
static final int PFLAG_DIRTY = 0x00200000;
/**
* View flag indicating whether this view was invalidated by an opaque
* invalidate request.
*
* @hide
*/
static final int PFLAG_DIRTY_OPAQUE = 0x00400000;
/**
* Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}.
*
* @hide
*/
static final int PFLAG_DIRTY_MASK = 0x00600000;
/**
* Indicates whether the background is opaque.
*
* @hide
*/
static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000;
/**
* Indicates whether the scrollbars are opaque.
*
* @hide
*/
static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000;
/**
* Indicates whether the view is opaque.
*
* @hide
*/
static final int PFLAG_OPAQUE_MASK = 0x01800000;
/**
* Indicates a prepressed state;
* the short time between ACTION_DOWN and recognizing
* a 'real' press. Prepressed is used to recognize quick taps
* even when they are shorter than ViewConfiguration.getTapTimeout().
*
* @hide
*/
private static final int PFLAG_PREPRESSED = 0x02000000;
/**
* Indicates whether the view is temporarily detached.
*
* @hide
*/
static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000;
/**
* Indicates that we should awaken scroll bars once attached
*
* PLEASE NOTE: This flag is now unused as we now send onVisibilityChanged
* during window attachment and it is no longer needed. Feel free to repurpose it.
*
* @hide
*/
private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000;
/**
* Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT.
* @hide
*/
private static final int PFLAG_HOVERED = 0x10000000;
/**
* no longer needed, should be reused
*/
private static final int PFLAG_DOES_NOTHING_REUSE_PLEASE = 0x20000000;
/** {@hide} */
static final int PFLAG_ACTIVATED = 0x40000000;
/**
* Indicates that this view was specifically invalidated, not just dirtied because some
* child view was invalidated. The flag is used to determine when we need to recreate
* a view's display list (as opposed to just returning a reference to its existing
* display list).
*
* @hide
*/
static final int PFLAG_INVALIDATED = 0x80000000;
/**
* Masks for mPrivateFlags2, as generated by dumpFlags():
*
* |-------|-------|-------|-------|
* 1 PFLAG2_DRAG_CAN_ACCEPT
* 1 PFLAG2_DRAG_HOVERED
* 11 PFLAG2_LAYOUT_DIRECTION_MASK
* 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL
* 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED
* 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK
* 1 PFLAG2_TEXT_DIRECTION_FLAGS[1]
* 1 PFLAG2_TEXT_DIRECTION_FLAGS[2]
* 11 PFLAG2_TEXT_DIRECTION_FLAGS[3]
* 1 PFLAG2_TEXT_DIRECTION_FLAGS[4]
* 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5]
* 11 PFLAG2_TEXT_DIRECTION_FLAGS[6]
* 111 PFLAG2_TEXT_DIRECTION_FLAGS[7]
* 111 PFLAG2_TEXT_DIRECTION_MASK
* 1 PFLAG2_TEXT_DIRECTION_RESOLVED
* 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT
* 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK
* 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1]
* 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2]
* 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3]
* 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4]
* 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5]
* 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6]
* 111 PFLAG2_TEXT_ALIGNMENT_MASK
* 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED
* 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT
* 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK
* 111 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK
* 11 PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK
* 1 PFLAG2_ACCESSIBILITY_FOCUSED
* 1 PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED
* 1 PFLAG2_VIEW_QUICK_REJECTED
* 1 PFLAG2_PADDING_RESOLVED
* 1 PFLAG2_DRAWABLE_RESOLVED
* 1 PFLAG2_HAS_TRANSIENT_STATE
* |-------|-------|-------|-------|
*/
/**
* Indicates that this view has reported that it can accept the current drag's content.
* Cleared when the drag operation concludes.
* @hide
*/
static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001;
/**
* Indicates that this view is currently directly under the drag location in a
* drag-and-drop operation involving content that it can accept. Cleared when
* the drag exits the view, or when the drag operation concludes.
* @hide
*/
static final int PFLAG2_DRAG_HOVERED = 0x00000002;
/** @hide */
@IntDef({
LAYOUT_DIRECTION_LTR,
LAYOUT_DIRECTION_RTL,
LAYOUT_DIRECTION_INHERIT,
LAYOUT_DIRECTION_LOCALE
})
@Retention(RetentionPolicy.SOURCE)
// Not called LayoutDirection to avoid conflict with android.util.LayoutDirection
public @interface LayoutDir {}
/** @hide */
@IntDef({
LAYOUT_DIRECTION_LTR,
LAYOUT_DIRECTION_RTL
})
@Retention(RetentionPolicy.SOURCE)
public @interface ResolvedLayoutDir {}
/**
* A flag to indicate that the layout direction of this view has not been defined yet.
* @hide
*/
public static final int LAYOUT_DIRECTION_UNDEFINED = LayoutDirection.UNDEFINED;
/**
* Horizontal layout direction of this view is from Left to Right.
* Use with {@link #setLayoutDirection}.
*/
public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR;
/**
* Horizontal layout direction of this view is from Right to Left.
* Use with {@link #setLayoutDirection}.
*/
public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL;
/**
* Horizontal layout direction of this view is inherited from its parent.
* Use with {@link #setLayoutDirection}.
*/
public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT;
/**
* Horizontal layout direction of this view is from deduced from the default language
* script for the locale. Use with {@link #setLayoutDirection}.
*/
public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE;
/**
* Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
* @hide
*/
static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2;
/**
* Mask for use with private flags indicating bits used for horizontal layout direction.
* @hide
*/
static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
/**
* Indicates whether the view horizontal layout direction has been resolved and drawn to the
* right-to-left direction.
* @hide
*/
static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
/**
* Indicates whether the view horizontal layout direction has been resolved.
* @hide
*/
static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
/**
* Mask for use with private flags indicating bits used for resolved horizontal layout direction.
* @hide
*/
static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C
<< PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
/*
* Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct
* flag value.
* @hide
*/
private static final int[] LAYOUT_DIRECTION_FLAGS = {
LAYOUT_DIRECTION_LTR,
LAYOUT_DIRECTION_RTL,
LAYOUT_DIRECTION_INHERIT,
LAYOUT_DIRECTION_LOCALE
};
/**
* Default horizontal layout direction.
*/
private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT;
/**
* Default horizontal layout direction.
* @hide
*/
static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR;
/**
* Text direction is inherited through {@link ViewGroup}
*/
public static final int TEXT_DIRECTION_INHERIT = 0;
/**
* Text direction is using "first strong algorithm". The first strong directional character
* determines the paragraph direction. If there is no strong directional character, the
* paragraph direction is the view's resolved layout direction.
*/
public static final int TEXT_DIRECTION_FIRST_STRONG = 1;
/**
* Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains
* any strong RTL character, otherwise it is LTR if it contains any strong LTR characters.
* If there are neither, the paragraph direction is the view's resolved layout direction.
*/
public static final int TEXT_DIRECTION_ANY_RTL = 2;
/**
* Text direction is forced to LTR.
*/
public static final int TEXT_DIRECTION_LTR = 3;
/**
* Text direction is forced to RTL.
*/
public static final int TEXT_DIRECTION_RTL = 4;
/**
* Text direction is coming from the system Locale.
*/
public static final int TEXT_DIRECTION_LOCALE = 5;
/**
* Text direction is using "first strong algorithm". The first strong directional character
* determines the paragraph direction. If there is no strong directional character, the
* paragraph direction is LTR.
*/
public static final int TEXT_DIRECTION_FIRST_STRONG_LTR = 6;
/**
* Text direction is using "first strong algorithm". The first strong directional character
* determines the paragraph direction. If there is no strong directional character, the
* paragraph direction is RTL.
*/
public static final int TEXT_DIRECTION_FIRST_STRONG_RTL = 7;
/**
* Default text direction is inherited
*/
private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT;
/**
* Default resolved text direction
* @hide
*/
static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG;
/**
* Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED)
* @hide
*/
static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6;
/**
* Mask for use with private flags indicating bits used for text direction.
* @hide
*/
static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007
<< PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
/**
* Array of text direction flags for mapping attribute "textDirection" to correct
* flag value.
* @hide
*/
private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = {
TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
TEXT_DIRECTION_FIRST_STRONG_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT,
TEXT_DIRECTION_FIRST_STRONG_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT
};
/**
* Indicates whether the view text direction has been resolved.
* @hide
*/
static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008
<< PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
/**
* Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
* @hide
*/
static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10;
/**
* Mask for use with private flags indicating bits used for resolved text direction.
* @hide
*/
static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007
<< PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
/**
* Indicates whether the view text direction has been resolved to the "first strong" heuristic.
* @hide
*/
static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT =
TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
/** @hide */
@IntDef({
TEXT_ALIGNMENT_INHERIT,
TEXT_ALIGNMENT_GRAVITY,
TEXT_ALIGNMENT_CENTER,
TEXT_ALIGNMENT_TEXT_START,
TEXT_ALIGNMENT_TEXT_END,
TEXT_ALIGNMENT_VIEW_START,
TEXT_ALIGNMENT_VIEW_END
})
@Retention(RetentionPolicy.SOURCE)
public @interface TextAlignment {}
/**
* Default text alignment. The text alignment of this View is inherited from its parent.
* Use with {@link #setTextAlignment(int)}
*/
public static final int TEXT_ALIGNMENT_INHERIT = 0;
/**
* Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL,
* ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction.
*
* Use with {@link #setTextAlignment(int)}
*/
public static final int TEXT_ALIGNMENT_GRAVITY = 1;
/**
* Align to the start of the paragraph, e.g. ALIGN_NORMAL.
*
* Use with {@link #setTextAlignment(int)}
*/
public static final int TEXT_ALIGNMENT_TEXT_START = 2;
/**
* Align to the end of the paragraph, e.g. ALIGN_OPPOSITE.
*
* Use with {@link #setTextAlignment(int)}
*/
public static final int TEXT_ALIGNMENT_TEXT_END = 3;
/**
* Center the paragraph, e.g. ALIGN_CENTER.
*
* Use with {@link #setTextAlignment(int)}
*/
public static final int TEXT_ALIGNMENT_CENTER = 4;
/**
* Align to the start of the view, which is ALIGN_LEFT if the view’s resolved
* layoutDirection is LTR, and ALIGN_RIGHT otherwise.
*
* Use with {@link #setTextAlignment(int)}
*/
public static final int TEXT_ALIGNMENT_VIEW_START = 5;
/**
* Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved
* layoutDirection is LTR, and ALIGN_LEFT otherwise.
*
* Use with {@link #setTextAlignment(int)}
*/
public static final int TEXT_ALIGNMENT_VIEW_END = 6;
/**
* Default text alignment is inherited
*/
private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY;
/**
* Default resolved text alignment
* @hide
*/
static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY;
/**
* Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED)
* @hide
*/
static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13;
/**
* Mask for use with private flags indicating bits used for text alignment.
* @hide
*/
static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
/**
* Array of text direction flags for mapping attribute "textAlignment" to correct
* flag value.
* @hide
*/
private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = {
TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT,
TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT
};
/**
* Indicates whether the view text alignment has been resolved.
* @hide
*/
static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
/**
* Bit shift to get the resolved text alignment.
* @hide
*/
static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17;
/**
* Mask for use with private flags indicating bits used for text alignment.
* @hide
*/
static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007
<< PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
/**
* Indicates whether if the view text alignment has been resolved to gravity
*/
private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT =
TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
// Accessiblity constants for mPrivateFlags2
/**
* Shift for the bits in {@link #mPrivateFlags2} related to the
* "importantForAccessibility" attribute.
*/
static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20;
/**
* Automatically determine whether a view is important for accessibility.
*/
public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000;
/**
* The view is important for accessibility.
*/
public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001;
/**
* The view is not important for accessibility.
*/
public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002;
/**
* The view is not important for accessibility, nor are any of its
* descendant views.
*/
public static final int IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS = 0x00000004;
/**
* The default whether the view is important for accessibility.
*/
static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO;
/**
* Mask for obtainig the bits which specify how to determine
* whether a view is important for accessibility.
*/
static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO
| IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO
| IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS)
<< PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
/**
* Shift for the bits in {@link #mPrivateFlags2} related to the
* "accessibilityLiveRegion" attribute.
*/
static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT = 23;
/**
* Live region mode specifying that accessibility services should not
* automatically announce changes to this view. This is the default live
* region mode for most views.
* <p>
* Use with {@link #setAccessibilityLiveRegion(int)}.
*/
public static final int ACCESSIBILITY_LIVE_REGION_NONE = 0x00000000;
/**
* Live region mode specifying that accessibility services should announce
* changes to this view.
* <p>
* Use with {@link #setAccessibilityLiveRegion(int)}.
*/
public static final int ACCESSIBILITY_LIVE_REGION_POLITE = 0x00000001;
/**
* Live region mode specifying that accessibility services should interrupt
* ongoing speech to immediately announce changes to this view.
* <p>
* Use with {@link #setAccessibilityLiveRegion(int)}.
*/
public static final int ACCESSIBILITY_LIVE_REGION_ASSERTIVE = 0x00000002;
/**
* The default whether the view is important for accessibility.
*/
static final int ACCESSIBILITY_LIVE_REGION_DEFAULT = ACCESSIBILITY_LIVE_REGION_NONE;
/**
* Mask for obtaining the bits which specify a view's accessibility live
* region mode.
*/
static final int PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK = (ACCESSIBILITY_LIVE_REGION_NONE
| ACCESSIBILITY_LIVE_REGION_POLITE | ACCESSIBILITY_LIVE_REGION_ASSERTIVE)
<< PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT;
/**
* Flag indicating whether a view has accessibility focus.
*/
static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000;
/**
* Flag whether the accessibility state of the subtree rooted at this view changed.
*/
static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000;
/**
* Flag indicating whether a view failed the quickReject() check in draw(). This condition
* is used to check whether later changes to the view's transform should invalidate the
* view to force the quickReject test to run again.
*/
static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000;
/**
* Flag indicating that start/end padding has been resolved into left/right padding
* for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()}
* and checked by {@link #measure(int, int)} to determine if padding needs to be resolved
* during measurement. In some special cases this is required such as when an adapter-based
* view measures prospective children without attaching them to a window.
*/
static final int PFLAG2_PADDING_RESOLVED = 0x20000000;
/**
* Flag indicating that the start/end drawables has been resolved into left/right ones.
*/
static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000;
/**
* Indicates that the view is tracking some sort of transient state
* that the app should not need to be aware of, but that the framework
* should take special care to preserve.
*/
static final int PFLAG2_HAS_TRANSIENT_STATE = 0x80000000;
/**
* Group of bits indicating that RTL properties resolution is done.
*/
static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED |
PFLAG2_TEXT_DIRECTION_RESOLVED |
PFLAG2_TEXT_ALIGNMENT_RESOLVED |
PFLAG2_PADDING_RESOLVED |
PFLAG2_DRAWABLE_RESOLVED;
// There are a couple of flags left in mPrivateFlags2
/* End of masks for mPrivateFlags2 */
/**
* Masks for mPrivateFlags3, as generated by dumpFlags():
*
* |-------|-------|-------|-------|
* 1 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM
* 1 PFLAG3_VIEW_IS_ANIMATING_ALPHA
* 1 PFLAG3_IS_LAID_OUT
* 1 PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT
* 1 PFLAG3_CALLED_SUPER
* 1 PFLAG3_APPLYING_INSETS
* 1 PFLAG3_FITTING_SYSTEM_WINDOWS
* 1 PFLAG3_NESTED_SCROLLING_ENABLED
* 1 PFLAG3_SCROLL_INDICATOR_TOP
* 1 PFLAG3_SCROLL_INDICATOR_BOTTOM
* 1 PFLAG3_SCROLL_INDICATOR_LEFT
* 1 PFLAG3_SCROLL_INDICATOR_RIGHT
* 1 PFLAG3_SCROLL_INDICATOR_START
* 1 PFLAG3_SCROLL_INDICATOR_END
* 1 PFLAG3_ASSIST_BLOCKED
* 1 PFLAG3_POINTER_ICON_NULL
* 1 PFLAG3_POINTER_ICON_VALUE_START
* 11111111 PFLAG3_POINTER_ICON_MASK
* 1 PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE
* 1 PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED
* 1 PFLAG3_TEMPORARY_DETACH
* 1 PFLAG3_NO_REVEAL_ON_FOCUS
* |-------|-------|-------|-------|
*/
/**
* Flag indicating that view has a transform animation set on it. This is used to track whether
* an animation is cleared between successive frames, in order to tell the associated
* DisplayList to clear its animation matrix.
*/
static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1;
/**
* Flag indicating that view has an alpha animation set on it. This is used to track whether an
* animation is cleared between successive frames, in order to tell the associated
* DisplayList to restore its alpha value.
*/
static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2;
/**
* Flag indicating that the view has been through at least one layout since it
* was last attached to a window.
*/
static final int PFLAG3_IS_LAID_OUT = 0x4;
/**
* Flag indicating that a call to measure() was skipped and should be done
* instead when layout() is invoked.
*/
static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8;
/**
* Flag indicating that an overridden method correctly called down to
* the superclass implementation as required by the API spec.
*/
static final int PFLAG3_CALLED_SUPER = 0x10;
/**
* Flag indicating that we're in the process of applying window insets.
*/
static final int PFLAG3_APPLYING_INSETS = 0x20;
/**
* Flag indicating that we're in the process of fitting system windows using the old method.
*/
static final int PFLAG3_FITTING_SYSTEM_WINDOWS = 0x40;
/**
* Flag indicating that nested scrolling is enabled for this view.
* The view will optionally cooperate with views up its parent chain to allow for
* integrated nested scrolling along the same axis.
*/
static final int PFLAG3_NESTED_SCROLLING_ENABLED = 0x80;
/**
* Flag indicating that the bottom scroll indicator should be displayed
* when this view can scroll up.
*/
static final int PFLAG3_SCROLL_INDICATOR_TOP = 0x0100;
/**
* Flag indicating that the bottom scroll indicator should be displayed
* when this view can scroll down.
*/
static final int PFLAG3_SCROLL_INDICATOR_BOTTOM = 0x0200;
/**
* Flag indicating that the left scroll indicator should be displayed
* when this view can scroll left.
*/
static final int PFLAG3_SCROLL_INDICATOR_LEFT = 0x0400;
/**
* Flag indicating that the right scroll indicator should be displayed
* when this view can scroll right.
*/
static final int PFLAG3_SCROLL_INDICATOR_RIGHT = 0x0800;
/**
* Flag indicating that the start scroll indicator should be displayed
* when this view can scroll in the start direction.
*/
static final int PFLAG3_SCROLL_INDICATOR_START = 0x1000;
/**
* Flag indicating that the end scroll indicator should be displayed
* when this view can scroll in the end direction.
*/
static final int PFLAG3_SCROLL_INDICATOR_END = 0x2000;
static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED;
static final int SCROLL_INDICATORS_NONE = 0x0000;
/**
* Mask for use with setFlags indicating bits used for indicating which
* scroll indicators are enabled.
*/
static final int SCROLL_INDICATORS_PFLAG3_MASK = PFLAG3_SCROLL_INDICATOR_TOP
| PFLAG3_SCROLL_INDICATOR_BOTTOM | PFLAG3_SCROLL_INDICATOR_LEFT
| PFLAG3_SCROLL_INDICATOR_RIGHT | PFLAG3_SCROLL_INDICATOR_START
| PFLAG3_SCROLL_INDICATOR_END;
/**
* Left-shift required to translate between public scroll indicator flags
* and internal PFLAGS3 flags. When used as a right-shift, translates
* PFLAGS3 flags to public flags.
*/
static final int SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT = 8;
/** @hide */
@Retention(RetentionPolicy.SOURCE)
@IntDef(flag = true,
value = {
SCROLL_INDICATOR_TOP,
SCROLL_INDICATOR_BOTTOM,
SCROLL_INDICATOR_LEFT,
SCROLL_INDICATOR_RIGHT,
SCROLL_INDICATOR_START,
SCROLL_INDICATOR_END,
})
public @interface ScrollIndicators {}
/**
* Scroll indicator direction for the top edge of the view.
*
* @see #setScrollIndicators(int)
* @see #setScrollIndicators(int, int)
* @see #getScrollIndicators()
*/
public static final int SCROLL_INDICATOR_TOP =
PFLAG3_SCROLL_INDICATOR_TOP >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
/**
* Scroll indicator direction for the bottom edge of the view.
*
* @see #setScrollIndicators(int)
* @see #setScrollIndicators(int, int)
* @see #getScrollIndicators()
*/
public static final int SCROLL_INDICATOR_BOTTOM =
PFLAG3_SCROLL_INDICATOR_BOTTOM >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
/**
* Scroll indicator direction for the left edge of the view.
*
* @see #setScrollIndicators(int)
* @see #setScrollIndicators(int, int)
* @see #getScrollIndicators()
*/
public static final int SCROLL_INDICATOR_LEFT =
PFLAG3_SCROLL_INDICATOR_LEFT >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
/**
* Scroll indicator direction for the right edge of the view.
*
* @see #setScrollIndicators(int)
* @see #setScrollIndicators(int, int)
* @see #getScrollIndicators()
*/
public static final int SCROLL_INDICATOR_RIGHT =
PFLAG3_SCROLL_INDICATOR_RIGHT >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
/**
* Scroll indicator direction for the starting edge of the view.
* <p>
* Resolved according to the view's layout direction, see
* {@link #getLayoutDirection()} for more information.
*
* @see #setScrollIndicators(int)
* @see #setScrollIndicators(int, int)
* @see #getScrollIndicators()
*/
public static final int SCROLL_INDICATOR_START =
PFLAG3_SCROLL_INDICATOR_START >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
/**
* Scroll indicator direction for the ending edge of the view.
* <p>
* Resolved according to the view's layout direction, see
* {@link #getLayoutDirection()} for more information.
*
* @see #setScrollIndicators(int)
* @see #setScrollIndicators(int, int)
* @see #getScrollIndicators()
*/
public static final int SCROLL_INDICATOR_END =
PFLAG3_SCROLL_INDICATOR_END >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
/**
* <p>Indicates that we are allowing {@link ViewStructure} to traverse
* into this view.<p>
*/
static final int PFLAG3_ASSIST_BLOCKED = 0x4000;
/**
* The mask for use with private flags indicating bits used for pointer icon shapes.
*/
static final int PFLAG3_POINTER_ICON_MASK = 0x7f8000;
/**
* Left-shift used for pointer icon shape values in private flags.
*/
static final int PFLAG3_POINTER_ICON_LSHIFT = 15;
/**
* Value indicating no specific pointer icons.
*/
private static final int PFLAG3_POINTER_ICON_NOT_SPECIFIED = 0 << PFLAG3_POINTER_ICON_LSHIFT;
/**
* Value indicating {@link PointerIcon.TYPE_NULL}.
*/
private static final int PFLAG3_POINTER_ICON_NULL = 1 << PFLAG3_POINTER_ICON_LSHIFT;
/**
* The base value for other pointer icon shapes.
*/
private static final int PFLAG3_POINTER_ICON_VALUE_START = 2 << PFLAG3_POINTER_ICON_LSHIFT;
/**
* Whether this view has rendered elements that overlap (see {@link
* #hasOverlappingRendering()}, {@link #forceHasOverlappingRendering(boolean)}, and
* {@link #getHasOverlappingRendering()} ). The value in this bit is only valid when
* PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED has been set. Otherwise, the value is
* determined by whatever {@link #hasOverlappingRendering()} returns.
*/
private static final int PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE = 0x800000;
/**
* Whether {@link #forceHasOverlappingRendering(boolean)} has been called. When true, value
* in PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE is valid.
*/
private static final int PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED = 0x1000000;
/**
* Flag indicating that the view is temporarily detached from the parent view.
*
* @see #onStartTemporaryDetach()
* @see #onFinishTemporaryDetach()
*/
static final int PFLAG3_TEMPORARY_DETACH = 0x2000000;
/**
* Flag indicating that the view does not wish to be revealed within its parent
* hierarchy when it gains focus. Expressed in the negative since the historical
* default behavior is to reveal on focus; this flag suppresses that behavior.
*
* @see #setRevealOnFocusHint(boolean)
* @see #getRevealOnFocusHint()
*/
private static final int PFLAG3_NO_REVEAL_ON_FOCUS = 0x4000000;
/* End of masks for mPrivateFlags3 */
/**
* Always allow a user to over-scroll this view, provided it is a
* view that can scroll.
*
* @see #getOverScrollMode()
* @see #setOverScrollMode(int)
*/
public static final int OVER_SCROLL_ALWAYS = 0;
/**
* Allow a user to over-scroll this view only if the content is large
* enough to meaningfully scroll, provided it is a view that can scroll.
*
* @see #getOverScrollMode()
* @see #setOverScrollMode(int)
*/
public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1;
/**
* Never allow a user to over-scroll this view.
*
* @see #getOverScrollMode()
* @see #setOverScrollMode(int)
*/
public static final int OVER_SCROLL_NEVER = 2;
/**
* Special constant for {@link #setSystemUiVisibility(int)}: View has
* requested the system UI (status bar) to be visible (the default).
*
* @see #setSystemUiVisibility(int)
*/
public static final int SYSTEM_UI_FLAG_VISIBLE = 0;
/**
* Flag for {@link #setSystemUiVisibility(int)}: View has requested the
* system UI to enter an unobtrusive "low profile" mode.
*
* <p>This is for use in games, book readers, video players, or any other
* "immersive" application where the usual system chrome is deemed too distracting.
*
* <p>In low profile mode, the status bar and/or navigation icons may dim.
*
* @see #setSystemUiVisibility(int)
*/
public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001;
/**
* Flag for {@link #setSystemUiVisibility(int)}: View has requested that the
* system navigation be temporarily hidden.
*
* <p>This is an even less obtrusive state than that called for by
* {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls
* (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause
* those to disappear. This is useful (in conjunction with the
* {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and
* {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN}
* window flags) for displaying content using every last pixel on the display.
*
* <p>There is a limitation: because navigation controls are so important, the least user
* interaction will cause them to reappear immediately. When this happens, both
* this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically,
* so that both elements reappear at the same time.
*
* @see #setSystemUiVisibility(int)
*/
public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002;
/**
* Flag for {@link #setSystemUiVisibility(int)}: View has requested to go
* into the normal fullscreen mode so that its content can take over the screen
* while still allowing the user to interact with the application.
*
* <p>This has the same visual effect as
* {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN
* WindowManager.LayoutParams.FLAG_FULLSCREEN},
* meaning that non-critical screen decorations (such as the status bar) will be
* hidden while the user is in the View's window, focusing the experience on
* that content. Unlike the window flag, if you are using ActionBar in
* overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY
* Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also
* hide the action bar.
*
* <p>This approach to going fullscreen is best used over the window flag when
* it is a transient state -- that is, the application does this at certain
* points in its user interaction where it wants to allow the user to focus
* on content, but not as a continuous state. For situations where the application
* would like to simply stay full screen the entire time (such as a game that
* wants to take over the screen), the
* {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag}
* is usually a better approach. The state set here will be removed by the system
* in various situations (such as the user moving to another application) like
* the other system UI states.
*
* <p>When using this flag, the application should provide some easy facility
* for the user to go out of it. A common example would be in an e-book
* reader, where tapping on the screen brings back whatever screen and UI
* decorations that had been hidden while the user was immersed in reading
* the book.
*
* @see #setSystemUiVisibility(int)
*/
public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004;
/**
* Flag for {@link #setSystemUiVisibility(int)}: When using other layout
* flags, we would like a stable view of the content insets given to
* {@link #fitSystemWindows(Rect)}. This means that the insets seen there
* will always represent the worst case that the application can expect
* as a continuous state. In the stock Android UI this is the space for
* the system bar, nav bar, and status bar, but not more transient elements
* such as an input method.
*
* The stable layout your UI sees is based on the system UI modes you can
* switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}
* then you will get a stable layout for changes of the
* {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify
* {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and
* {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition
* to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}
* with a stable layout. (Note that you should avoid using
* {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.)
*
* If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN}
* to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}),
* then a hidden status bar will be considered a "stable" state for purposes
* here. This allows your UI to continually hide the status bar, while still
* using the system UI flags to hide the action bar while still retaining
* a stable layout. Note that changing the window fullscreen flag will never
* provide a stable layout for a clean transition.
*
* <p>If you are using ActionBar in
* overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY
* Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the
* insets it adds to those given to the application.
*/
public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100;
/**
* Flag for {@link #setSystemUiVisibility(int)}: View would like its window
* to be laid out as if it has requested
* {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This
* allows it to avoid artifacts when switching in and out of that mode, at
* the expense that some of its user interface may be covered by screen
* decorations when they are shown. You can perform layout of your inner
* UI elements to account for the navigation system UI through the
* {@link #fitSystemWindows(Rect)} method.
*/
public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200;
/**
* Flag for {@link #setSystemUiVisibility(int)}: View would like its window
* to be laid out as if it has requested
* {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This
* allows it to avoid artifacts when switching in and out of that mode, at
* the expense that some of its user interface may be covered by screen
* decorations when they are shown. You can perform layout of your inner
* UI elements to account for non-fullscreen system UI through the
* {@link #fitSystemWindows(Rect)} method.
*/
public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400;
/**
* Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when
* hiding the navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. If this flag is
* not set, {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any
* user interaction.
* <p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only
* has an effect when used in combination with that flag.</p>
*/
public static final int SYSTEM_UI_FLAG_IMMERSIVE = 0x00000800;
/**
* Flag for {@link #setSystemUiVisibility(int)}: View would like to remain interactive when
* hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the navigation
* bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. Use this flag to create an immersive
* experience while also hiding the system bars. If this flag is not set,
* {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} will be force cleared by the system on any user
* interaction, and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be force-cleared by the system
* if the user swipes from the top of the screen.
* <p>When system bars are hidden in immersive mode, they can be revealed temporarily with
* system gestures, such as swiping from the top of the screen. These transient system bars
* will overlay app’s content, may have some degree of transparency, and will automatically
* hide after a short timeout.
* </p><p>Since this flag is a modifier for {@link #SYSTEM_UI_FLAG_FULLSCREEN} and
* {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, it only has an effect when used in combination
* with one or both of those flags.</p>
*/
public static final int SYSTEM_UI_FLAG_IMMERSIVE_STICKY = 0x00001000;
/**
* Flag for {@link #setSystemUiVisibility(int)}: Requests the status bar to draw in a mode that
* is compatible with light status bar backgrounds.
*
* <p>For this to take effect, the window must request
* {@link android.view.WindowManager.LayoutParams#FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS
* FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS} but not
* {@link android.view.WindowManager.LayoutParams#FLAG_TRANSLUCENT_STATUS
* FLAG_TRANSLUCENT_STATUS}.
*
* @see android.R.attr#windowLightStatusBar
*/
public static final int SYSTEM_UI_FLAG_LIGHT_STATUS_BAR = 0x00002000;
/**
* @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead.
*/
public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE;
/**
* @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead.
*/
public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to make the status bar not expandable. Unless you also
* set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show.
*/
public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to hide notification icons and scrolling ticker text.
*/
public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to disable incoming notification alerts. This will not block
* icons, but it will block sound, vibrating and other visual or aural notifications.
*/
public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to hide only the scrolling ticker. Note that
* {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies
* {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}.
*/
public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to hide the center system info area.
*/
public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to hide only the home button. Don't use this
* unless you're a special part of the system UI (i.e., setup wizard, keyguard).
*/
public static final int STATUS_BAR_DISABLE_HOME = 0x00200000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to hide only the back button. Don't use this
* unless you're a special part of the system UI (i.e., setup wizard, keyguard).
*/
public static final int STATUS_BAR_DISABLE_BACK = 0x00400000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to hide only the clock. You might use this if your activity has
* its own clock making the status bar's clock redundant.
*/
public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to hide only the recent apps button. Don't use this
* unless you're a special part of the system UI (i.e., setup wizard, keyguard).
*/
public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to disable the global search gesture. Don't use this
* unless you're a special part of the system UI (i.e., setup wizard, keyguard).
*/
public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to specify that the status bar is displayed in transient mode.
*/
public static final int STATUS_BAR_TRANSIENT = 0x04000000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to specify that the navigation bar is displayed in transient mode.
*/
public static final int NAVIGATION_BAR_TRANSIENT = 0x08000000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to specify that the hidden status bar would like to be shown.
*/
public static final int STATUS_BAR_UNHIDE = 0x10000000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to specify that the hidden navigation bar would like to be shown.
*/
public static final int NAVIGATION_BAR_UNHIDE = 0x20000000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to specify that the status bar is displayed in translucent mode.
*/
public static final int STATUS_BAR_TRANSLUCENT = 0x40000000;
/**
* @hide
*
* NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked
* out of the public fields to keep the undefined bits out of the developer's way.
*
* Flag to specify that the navigation bar is displayed in translucent mode.
*/
public static final int NAVIGATION_BAR_TRANSLUCENT = 0x80000000;
/**
* @hide
*
* Makes navigation bar transparent (but not the status bar).
*/
public static final int NAVIGATION_BAR_TRANSPARENT = 0x00008000;
/**
* @hide
*
* Makes status bar transparent (but not the navigation bar).
*/
public static final int STATUS_BAR_TRANSPARENT = 0x0000008;
/**
* @hide
*
* Makes both status bar and navigation bar transparent.
*/
public static final int SYSTEM_UI_TRANSPARENT = NAVIGATION_BAR_TRANSPARENT
| STATUS_BAR_TRANSPARENT;
/**
* @hide
*/
public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x00003FF7;
/**
* These are the system UI flags that can be cleared by events outside
* of an application. Currently this is just the ability to tap on the
* screen while hiding the navigation bar to have it return.
* @hide
*/
public static final int SYSTEM_UI_CLEARABLE_FLAGS =
SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION
| SYSTEM_UI_FLAG_FULLSCREEN;
/**
* Flags that can impact the layout in relation to system UI.
*/
public static final int SYSTEM_UI_LAYOUT_FLAGS =
SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
/** @hide */
@IntDef(flag = true,
value = { FIND_VIEWS_WITH_TEXT, FIND_VIEWS_WITH_CONTENT_DESCRIPTION })
@Retention(RetentionPolicy.SOURCE)
public @interface FindViewFlags {}
/**
* Find views that render the specified text.
*
* @see #findViewsWithText(ArrayList, CharSequence, int)
*/
public static final int FIND_VIEWS_WITH_TEXT = 0x00000001;
/**
* Find find views that contain the specified content description.
*
* @see #findViewsWithText(ArrayList, CharSequence, int)
*/
public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002;
/**
* Find views that contain {@link AccessibilityNodeProvider}. Such
* a View is a root of virtual view hierarchy and may contain the searched
* text. If this flag is set Views with providers are automatically
* added and it is a responsibility of the client to call the APIs of
* the provider to determine whether the virtual tree rooted at this View
* contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s
* representing the virtual views with this text.
*
* @see #findViewsWithText(ArrayList, CharSequence, int)
*
* @hide
*/
public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004;
/**
* The undefined cursor position.
*
* @hide
*/
public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1;
/**
* Indicates that the screen has changed state and is now off.
*
* @see #onScreenStateChanged(int)
*/
public static final int SCREEN_STATE_OFF = 0x0;
/**
* Indicates that the screen has changed state and is now on.
*
* @see #onScreenStateChanged(int)
*/
public static final int SCREEN_STATE_ON = 0x1;
/**
* Indicates no axis of view scrolling.
*/
public static final int SCROLL_AXIS_NONE = 0;
/**
* Indicates scrolling along the horizontal axis.
*/
public static final int SCROLL_AXIS_HORIZONTAL = 1 << 0;
/**
* Indicates scrolling along the vertical axis.
*/
public static final int SCROLL_AXIS_VERTICAL = 1 << 1;
/**
* Controls the over-scroll mode for this view.
* See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)},
* {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS},
* and {@link #OVER_SCROLL_NEVER}.
*/
private int mOverScrollMode;
/**
* The parent this view is attached to.
* {@hide}
*
* @see #getParent()
*/
protected ViewParent mParent;
/**
* {@hide}
*/
AttachInfo mAttachInfo;
/**
* {@hide}
*/
@ViewDebug.ExportedProperty(flagMapping = {
@ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT,
name = "FORCE_LAYOUT"),
@ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED,
name = "LAYOUT_REQUIRED"),
@ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID,
name = "DRAWING_CACHE_INVALID", outputIf = false),
@ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true),
@ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false),
@ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"),
@ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY")
}, formatToHexString = true)
int mPrivateFlags;
int mPrivateFlags2;
int mPrivateFlags3;
/**
* This view's request for the visibility of the status bar.
* @hide
*/
@ViewDebug.ExportedProperty(flagMapping = {
@ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE,
equals = SYSTEM_UI_FLAG_LOW_PROFILE,
name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true),
@ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION,
equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION,
name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true),
@ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK,
equals = SYSTEM_UI_FLAG_VISIBLE,
name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true)
}, formatToHexString = true)
int mSystemUiVisibility;
/**
* Reference count for transient state.
* @see #setHasTransientState(boolean)
*/
int mTransientStateCount = 0;
/**
* Count of how many windows this view has been attached to.
*/
int mWindowAttachCount;
/**
* The layout parameters associated with this view and used by the parent
* {@link android.view.ViewGroup} to determine how this view should be
* laid out.
* {@hide}
*/
protected ViewGroup.LayoutParams mLayoutParams;
/**
* The view flags hold various views states.
* {@hide}
*/
@ViewDebug.ExportedProperty(formatToHexString = true)
int mViewFlags;
static class TransformationInfo {
/**
* The transform matrix for the View. This transform is calculated internally
* based on the translation, rotation, and scale properties.
*
* Do *not* use this variable directly; instead call getMatrix(), which will
* load the value from the View's RenderNode.
*/
private final Matrix mMatrix = new Matrix();
/**
* The inverse transform matrix for the View. This transform is calculated
* internally based on the translation, rotation, and scale properties.
*
* Do *not* use this variable directly; instead call getInverseMatrix(),
* which will load the value from the View's RenderNode.
*/
private Matrix mInverseMatrix;
/**
* The opacity of the View. This is a value from 0 to 1, where 0 means
* completely transparent and 1 means completely opaque.
*/
@ViewDebug.ExportedProperty
float mAlpha = 1f;
/**
* The opacity of the view as manipulated by the Fade transition. This is a hidden
* property only used by transitions, which is composited with the other alpha
* values to calculate the final visual alpha value.
*/
float mTransitionAlpha = 1f;
}
TransformationInfo mTransformationInfo;
/**
* Current clip bounds. to which all drawing of this view are constrained.
*/
Rect mClipBounds = null;
private boolean mLastIsOpaque;
/**
* The distance in pixels from the left edge of this view's parent
* to the left edge of this view.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "layout")
protected int mLeft;
/**
* The distance in pixels from the left edge of this view's parent
* to the right edge of this view.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "layout")
protected int mRight;
/**
* The distance in pixels from the top edge of this view's parent
* to the top edge of this view.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "layout")
protected int mTop;
/**
* The distance in pixels from the top edge of this view's parent
* to the bottom edge of this view.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "layout")
protected int mBottom;
/**
* The offset, in pixels, by which the content of this view is scrolled
* horizontally.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "scrolling")
protected int mScrollX;
/**
* The offset, in pixels, by which the content of this view is scrolled
* vertically.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "scrolling")
protected int mScrollY;
/**
* The left padding in pixels, that is the distance in pixels between the
* left edge of this view and the left edge of its content.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "padding")
protected int mPaddingLeft = 0;
/**
* The right padding in pixels, that is the distance in pixels between the
* right edge of this view and the right edge of its content.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "padding")
protected int mPaddingRight = 0;
/**
* The top padding in pixels, that is the distance in pixels between the
* top edge of this view and the top edge of its content.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "padding")
protected int mPaddingTop;
/**
* The bottom padding in pixels, that is the distance in pixels between the
* bottom edge of this view and the bottom edge of its content.
* {@hide}
*/
@ViewDebug.ExportedProperty(category = "padding")
protected int mPaddingBottom;
/**
* The layout insets in pixels, that is the distance in pixels between the
* visible edges of this view its bounds.
*/
private Insets mLayoutInsets;
/**
* Briefly describes the view and is primarily used for accessibility support.
*/
private CharSequence mContentDescription;
/**
* Specifies the id of a view for which this view serves as a label for
* accessibility purposes.
*/
private int mLabelForId = View.NO_ID;
/**
* Predicate for matching labeled view id with its label for
* accessibility purposes.
*/
private MatchLabelForPredicate mMatchLabelForPredicate;
/**
* Specifies a view before which this one is visited in accessibility traversal.
*/
private int mAccessibilityTraversalBeforeId = NO_ID;
/**
* Specifies a view after which this one is visited in accessibility traversal.
*/
private int mAccessibilityTraversalAfterId = NO_ID;
/**
* Predicate for matching a view by its id.
*/
private MatchIdPredicate mMatchIdPredicate;
/**
* Cache the paddingRight set by the user to append to the scrollbar's size.
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "padding")
protected int mUserPaddingRight;
/**
* Cache the paddingBottom set by the user to append to the scrollbar's size.
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "padding")
protected int mUserPaddingBottom;
/**
* Cache the paddingLeft set by the user to append to the scrollbar's size.
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "padding")
protected int mUserPaddingLeft;
/**
* Cache the paddingStart set by the user to append to the scrollbar's size.
*
*/
@ViewDebug.ExportedProperty(category = "padding")
int mUserPaddingStart;
/**
* Cache the paddingEnd set by the user to append to the scrollbar's size.
*
*/
@ViewDebug.ExportedProperty(category = "padding")
int mUserPaddingEnd;
/**
* Cache initial left padding.
*
* @hide
*/
int mUserPaddingLeftInitial;
/**
* Cache initial right padding.
*
* @hide
*/
int mUserPaddingRightInitial;
/**
* Default undefined padding
*/
private static final int UNDEFINED_PADDING = Integer.MIN_VALUE;
/**
* Cache if a left padding has been defined
*/
private boolean mLeftPaddingDefined = false;
/**
* Cache if a right padding has been defined
*/
private boolean mRightPaddingDefined = false;
/**
* @hide
*/
int mOldWidthMeasureSpec = Integer.MIN_VALUE;
/**
* @hide
*/
int mOldHeightMeasureSpec = Integer.MIN_VALUE;
private LongSparseLongArray mMeasureCache;
@ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_")
private Drawable mBackground;
private TintInfo mBackgroundTint;
@ViewDebug.ExportedProperty(deepExport = true, prefix = "fg_")
private ForegroundInfo mForegroundInfo;
private Drawable mScrollIndicatorDrawable;
/**
* RenderNode used for backgrounds.
* <p>
* When non-null and valid, this is expected to contain an up-to-date copy
* of the background drawable. It is cleared on temporary detach, and reset
* on cleanup.
*/
private RenderNode mBackgroundRenderNode;
private int mBackgroundResource;
private boolean mBackgroundSizeChanged;
private String mTransitionName;
static class TintInfo {
ColorStateList mTintList;
PorterDuff.Mode mTintMode;
boolean mHasTintMode;
boolean mHasTintList;
}
private static class ForegroundInfo {
private Drawable mDrawable;
private TintInfo mTintInfo;
private int mGravity = Gravity.FILL;
private boolean mInsidePadding = true;
private boolean mBoundsChanged = true;
private final Rect mSelfBounds = new Rect();
private final Rect mOverlayBounds = new Rect();
}
static class ListenerInfo {
/**
* Listener used to dispatch focus change events.
* This field should be made private, so it is hidden from the SDK.
* {@hide}
*/
protected OnFocusChangeListener mOnFocusChangeListener;
/**
* Listeners for layout change events.
*/
private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners;
protected OnScrollChangeListener mOnScrollChangeListener;
/**
* Listeners for attach events.
*/
private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners;
/**
* Listener used to dispatch click events.
* This field should be made private, so it is hidden from the SDK.
* {@hide}
*/
public OnClickListener mOnClickListener;
/**
* Listener used to dispatch long click events.
* This field should be made private, so it is hidden from the SDK.
* {@hide}
*/
protected OnLongClickListener mOnLongClickListener;
/**
* Listener used to dispatch context click events. This field should be made private, so it
* is hidden from the SDK.
* {@hide}
*/
protected OnContextClickListener mOnContextClickListener;
/**
* Listener used to build the context menu.
* This field should be made private, so it is hidden from the SDK.
* {@hide}
*/
protected OnCreateContextMenuListener mOnCreateContextMenuListener;
private OnKeyListener mOnKeyListener;
private OnTouchListener mOnTouchListener;
private OnHoverListener mOnHoverListener;
private OnGenericMotionListener mOnGenericMotionListener;
private OnDragListener mOnDragListener;
private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener;
OnApplyWindowInsetsListener mOnApplyWindowInsetsListener;
}
ListenerInfo mListenerInfo;
// Temporary values used to hold (x,y) coordinates when delegating from the
// two-arg performLongClick() method to the legacy no-arg version.
private float mLongClickX = Float.NaN;
private float mLongClickY = Float.NaN;
/**
* The application environment this view lives in.
* This field should be made private, so it is hidden from the SDK.
* {@hide}
*/
@ViewDebug.ExportedProperty(deepExport = true)
protected Context mContext;
private final Resources mResources;
private ScrollabilityCache mScrollCache;
private int[] mDrawableState = null;
ViewOutlineProvider mOutlineProvider = ViewOutlineProvider.BACKGROUND;
/**
* Animator that automatically runs based on state changes.
*/
private StateListAnimator mStateListAnimator;
/**
* When this view has focus and the next focus is {@link #FOCUS_LEFT},
* the user may specify which view to go to next.
*/
private int mNextFocusLeftId = View.NO_ID;
/**
* When this view has focus and the next focus is {@link #FOCUS_RIGHT},
* the user may specify which view to go to next.
*/
private int mNextFocusRightId = View.NO_ID;
/**
* When this view has focus and the next focus is {@link #FOCUS_UP},
* the user may specify which view to go to next.
*/
private int mNextFocusUpId = View.NO_ID;
/**
* When this view has focus and the next focus is {@link #FOCUS_DOWN},
* the user may specify which view to go to next.
*/
private int mNextFocusDownId = View.NO_ID;
/**
* When this view has focus and the next focus is {@link #FOCUS_FORWARD},
* the user may specify which view to go to next.
*/
int mNextFocusForwardId = View.NO_ID;
private CheckForLongPress mPendingCheckForLongPress;
private CheckForTap mPendingCheckForTap = null;
private PerformClick mPerformClick;
private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent;
private UnsetPressedState mUnsetPressedState;
/**
* Whether the long press's action has been invoked. The tap's action is invoked on the
* up event while a long press is invoked as soon as the long press duration is reached, so
* a long press could be performed before the tap is checked, in which case the tap's action
* should not be invoked.
*/
private boolean mHasPerformedLongPress;
/**
* Whether a context click button is currently pressed down. This is true when the stylus is
* touching the screen and the primary button has been pressed, or if a mouse's right button is
* pressed. This is false once the button is released or if the stylus has been lifted.
*/
private boolean mInContextButtonPress;
/**
* Whether the next up event should be ignored for the purposes of gesture recognition. This is
* true after a stylus button press has occured, when the next up event should not be recognized
* as a tap.
*/
private boolean mIgnoreNextUpEvent;
/**
* The minimum height of the view. We'll try our best to have the height
* of this view to at least this amount.
*/
@ViewDebug.ExportedProperty(category = "measurement")
private int mMinHeight;
/**
* The minimum width of the view. We'll try our best to have the width
* of this view to at least this amount.
*/
@ViewDebug.ExportedProperty(category = "measurement")
private int mMinWidth;
/**
* The delegate to handle touch events that are physically in this view
* but should be handled by another view.
*/
private TouchDelegate mTouchDelegate = null;
/**
* Solid color to use as a background when creating the drawing cache. Enables
* the cache to use 16 bit bitmaps instead of 32 bit.
*/
private int mDrawingCacheBackgroundColor = 0;
/**
* Special tree observer used when mAttachInfo is null.
*/
private ViewTreeObserver mFloatingTreeObserver;
/**
* Cache the touch slop from the context that created the view.
*/
private int mTouchSlop;
/**
* Object that handles automatic animation of view properties.
*/
private ViewPropertyAnimator mAnimator = null;
/**
* List of registered FrameMetricsObservers.
*/
private ArrayList<FrameMetricsObserver> mFrameMetricsObservers;
/**
* Flag indicating that a drag can cross window boundaries. When
* {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object, int)} is called
* with this flag set, all visible applications with targetSdkVersion >=
* {@link android.os.Build.VERSION_CODES#N API 24} will be able to participate
* in the drag operation and receive the dragged content.
*
* <p>If this is the only flag set, then the drag recipient will only have access to text data
* and intents contained in the {@link ClipData} object. Access to URIs contained in the
* {@link ClipData} is determined by other DRAG_FLAG_GLOBAL_* flags</p>
*/
public static final int DRAG_FLAG_GLOBAL = 1 << 8; // 256
/**
* When this flag is used with {@link #DRAG_FLAG_GLOBAL}, the drag recipient will be able to
* request read access to the content URI(s) contained in the {@link ClipData} object.
* @see android.content.Intent.FLAG_GRANT_READ_URI_PERMISSION
*/
public static final int DRAG_FLAG_GLOBAL_URI_READ = Intent.FLAG_GRANT_READ_URI_PERMISSION;
/**
* When this flag is used with {@link #DRAG_FLAG_GLOBAL}, the drag recipient will be able to
* request write access to the content URI(s) contained in the {@link ClipData} object.
* @see android.content.Intent.FLAG_GRANT_WRITE_URI_PERMISSION
*/
public static final int DRAG_FLAG_GLOBAL_URI_WRITE = Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
/**
* When this flag is used with {@link #DRAG_FLAG_GLOBAL_URI_READ} and/or {@link
* #DRAG_FLAG_GLOBAL_URI_WRITE}, the URI permission grant can be persisted across device
* reboots until explicitly revoked with
* {@link android.content.Context#revokeUriPermission(Uri,int) Context.revokeUriPermission}.
* @see android.content.Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
*/
public static final int DRAG_FLAG_GLOBAL_PERSISTABLE_URI_PERMISSION =
Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION;
/**
* When this flag is used with {@link #DRAG_FLAG_GLOBAL_URI_READ} and/or {@link
* #DRAG_FLAG_GLOBAL_URI_WRITE}, the URI permission grant applies to any URI that is a prefix
* match against the original granted URI.
* @see android.content.Intent.FLAG_GRANT_PREFIX_URI_PERMISSION
*/
public static final int DRAG_FLAG_GLOBAL_PREFIX_URI_PERMISSION =
Intent.FLAG_GRANT_PREFIX_URI_PERMISSION;
/**
* Flag indicating that the drag shadow will be opaque. When
* {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object, int)} is called
* with this flag set, the drag shadow will be opaque, otherwise, it will be semitransparent.
*/
public static final int DRAG_FLAG_OPAQUE = 1 << 9;
/**
* Vertical scroll factor cached by {@link #getVerticalScrollFactor}.
*/
private float mVerticalScrollFactor;
/**
* Position of the vertical scroll bar.
*/
private int mVerticalScrollbarPosition;
/**
* Position the scroll bar at the default position as determined by the system.
*/
public static final int SCROLLBAR_POSITION_DEFAULT = 0;
/**
* Position the scroll bar along the left edge.
*/
public static final int SCROLLBAR_POSITION_LEFT = 1;
/**
* Position the scroll bar along the right edge.
*/
public static final int SCROLLBAR_POSITION_RIGHT = 2;
/**
* Indicates that the view does not have a layer.
*
* @see #getLayerType()
* @see #setLayerType(int, android.graphics.Paint)
* @see #LAYER_TYPE_SOFTWARE
* @see #LAYER_TYPE_HARDWARE
*/
public static final int LAYER_TYPE_NONE = 0;
/**
* <p>Indicates that the view has a software layer. A software layer is backed
* by a bitmap and causes the view to be rendered using Android's software
* rendering pipeline, even if hardware acceleration is enabled.</p>
*
* <p>Software layers have various usages:</p>
* <p>When the application is not using hardware acceleration, a software layer
* is useful to apply a specific color filter and/or blending mode and/or
* translucency to a view and all its children.</p>
* <p>When the application is using hardware acceleration, a software layer
* is useful to render drawing primitives not supported by the hardware
* accelerated pipeline. It can also be used to cache a complex view tree
* into a texture and reduce the complexity of drawing operations. For instance,
* when animating a complex view tree with a translation, a software layer can
* be used to render the view tree only once.</p>
* <p>Software layers should be avoided when the affected view tree updates
* often. Every update will require to re-render the software layer, which can
* potentially be slow (particularly when hardware acceleration is turned on
* since the layer will have to be uploaded into a hardware texture after every
* update.)</p>
*
* @see #getLayerType()
* @see #setLayerType(int, android.graphics.Paint)
* @see #LAYER_TYPE_NONE
* @see #LAYER_TYPE_HARDWARE
*/
public static final int LAYER_TYPE_SOFTWARE = 1;
/**
* <p>Indicates that the view has a hardware layer. A hardware layer is backed
* by a hardware specific texture (generally Frame Buffer Objects or FBO on
* OpenGL hardware) and causes the view to be rendered using Android's hardware
* rendering pipeline, but only if hardware acceleration is turned on for the
* view hierarchy. When hardware acceleration is turned off, hardware layers
* behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p>
*
* <p>A hardware layer is useful to apply a specific color filter and/or
* blending mode and/or translucency to a view and all its children.</p>
* <p>A hardware layer can be used to cache a complex view tree into a
* texture and reduce the complexity of drawing operations. For instance,
* when animating a complex view tree with a translation, a hardware layer can
* be used to render the view tree only once.</p>
* <p>A hardware layer can also be used to increase the rendering quality when
* rotation transformations are applied on a view. It can also be used to
* prevent potential clipping issues when applying 3D transforms on a view.</p>
*
* @see #getLayerType()
* @see #setLayerType(int, android.graphics.Paint)
* @see #LAYER_TYPE_NONE
* @see #LAYER_TYPE_SOFTWARE
*/
public static final int LAYER_TYPE_HARDWARE = 2;
@ViewDebug.ExportedProperty(category = "drawing", mapping = {
@ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"),
@ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"),
@ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE")
})
int mLayerType = LAYER_TYPE_NONE;
Paint mLayerPaint;
/**
* Set to true when drawing cache is enabled and cannot be created.
*
* @hide
*/
public boolean mCachingFailed;
private Bitmap mDrawingCache;
private Bitmap mUnscaledDrawingCache;
/**
* RenderNode holding View properties, potentially holding a DisplayList of View content.
* <p>
* When non-null and valid, this is expected to contain an up-to-date copy
* of the View content. Its DisplayList content is cleared on temporary detach and reset on
* cleanup.
*/
final RenderNode mRenderNode;
/**
* Set to true when the view is sending hover accessibility events because it
* is the innermost hovered view.
*/
private boolean mSendingHoverAccessibilityEvents;
/**
* Delegate for injecting accessibility functionality.
*/
AccessibilityDelegate mAccessibilityDelegate;
/**
* The view's overlay layer. Developers get a reference to the overlay via getOverlay()
* and add/remove objects to/from the overlay directly through the Overlay methods.
*/
ViewOverlay mOverlay;
/**
* The currently active parent view for receiving delegated nested scrolling events.
* This is set by {@link #startNestedScroll(int)} during a touch interaction and cleared
* by {@link #stopNestedScroll()} at the same point where we clear
* requestDisallowInterceptTouchEvent.
*/
private ViewParent mNestedScrollingParent;
/**
* Consistency verifier for debugging purposes.
* @hide
*/
protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier =
InputEventConsistencyVerifier.isInstrumentationEnabled() ?
new InputEventConsistencyVerifier(this, 0) : null;
private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);
private int[] mTempNestedScrollConsumed;
/**
* An overlay is going to draw this View instead of being drawn as part of this
* View's parent. mGhostView is the View in the Overlay that must be invalidated
* when this view is invalidated.
*/
GhostView mGhostView;
/**
* Holds pairs of adjacent attribute data: attribute name followed by its value.
* @hide
*/
@ViewDebug.ExportedProperty(category = "attributes", hasAdjacentMapping = true)
public String[] mAttributes;
/**
* Maps a Resource id to its name.
*/
private static SparseArray<String> mAttributeMap;
/**
* Queue of pending runnables. Used to postpone calls to post() until this
* view is attached and has a handler.
*/
private HandlerActionQueue mRunQueue;
/**
* The pointer icon when the mouse hovers on this view. The default is null.
*/
private PointerIcon mPointerIcon;
/**
* @hide
*/
String mStartActivityRequestWho;
@Nullable
private RoundScrollbarRenderer mRoundScrollbarRenderer;
/**
* Simple constructor to use when creating a view from code.
*
* @param context The Context the view is running in, through which it can
* access the current theme, resources, etc.
*/
public View(Context context) {
mContext = context;
mResources = context != null ? context.getResources() : null;
mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED;
// Set some flags defaults
mPrivateFlags2 =
(LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) |
(TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) |
(PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) |
(TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) |
(PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) |
(IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS);
mUserPaddingStart = UNDEFINED_PADDING;
mUserPaddingEnd = UNDEFINED_PADDING;
mRenderNode = RenderNode.create(getClass().getName(), this);
if (!sCompatibilityDone && context != null) {
final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion;
// Older apps may need this compatibility hack for measurement.
sUseBrokenMakeMeasureSpec = targetSdkVersion <= JELLY_BEAN_MR1;
// Older apps expect onMeasure() to always be called on a layout pass, regardless
// of whether a layout was requested on that View.
sIgnoreMeasureCache = targetSdkVersion < KITKAT;
Canvas.sCompatibilityRestore = targetSdkVersion < M;
// In M and newer, our widgets can pass a "hint" value in the size
// for UNSPECIFIED MeasureSpecs. This lets child views of scrolling containers
// know what the expected parent size is going to be, so e.g. list items can size
// themselves at 1/3 the size of their container. It breaks older apps though,
// specifically apps that use some popular open source libraries.
sUseZeroUnspecifiedMeasureSpec = targetSdkVersion < M;
// Old versions of the platform would give different results from
// LinearLayout measurement passes using EXACTLY and non-EXACTLY
// modes, so we always need to run an additional EXACTLY pass.
sAlwaysRemeasureExactly = targetSdkVersion <= M;
// Prior to N, layout params could change without requiring a
// subsequent call to setLayoutParams() and they would usually
// work. Partial layout breaks this assumption.
sLayoutParamsAlwaysChanged = targetSdkVersion <= M;
// Prior to N, TextureView would silently ignore calls to setBackground/setForeground.
// On N+, we throw, but that breaks compatibility with apps that use these methods.
sTextureViewIgnoresDrawableSetters = targetSdkVersion <= M;
// Prior to N, we would drop margins in LayoutParam conversions. The fix triggers bugs
// in apps so we target check it to avoid breaking existing apps.
sPreserveMarginParamsInLayoutParamConversion = targetSdkVersion >= N;
sCascadedDragDrop = targetSdkVersion < N;
sCompatibilityDone = true;
}
}
/**
* Constructor that is called when inflating a view from XML. This is called
* when a view is being constructed from an XML file, supplying attributes
* that were specified in the XML file. This version uses a default style of
* 0, so the only attribute values applied are those in the Context's Theme
* and the given AttributeSet.
*
* <p>
* The method onFinishInflate() will be called after all children have been
* added.
*
* @param context The Context the view is running in, through which it can
* access the current theme, resources, etc.
* @param attrs The attributes of the XML tag that is inflating the view.
* @see #View(Context, AttributeSet, int)
*/
public View(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* Perform inflation from XML and apply a class-specific base style from a
* theme attribute. This constructor of View allows subclasses to use their
* own base style when they are inflating. For example, a Button class's
* constructor would call this version of the super class constructor and
* supply <code>R.attr.buttonStyle</code> for <var>defStyleAttr</var>; this
* allows the theme's button style to modify all of the base view attributes
* (in particular its background) as well as the Button class's attributes.
*
* @param context The Context the view is running in, through which it can
* access the current theme, resources, etc.
* @param attrs The attributes of the XML tag that is inflating the view.
* @param defStyleAttr An attribute in the current theme that contains a
* reference to a style resource that supplies default values for
* the view. Can be 0 to not look for defaults.
* @see #View(Context, AttributeSet)
*/
public View(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
/**
* Perform inflation from XML and apply a class-specific base style from a
* theme attribute or style resource. This constructor of View allows
* subclasses to use their own base style when they are inflating.
* <p>
* When determining the final value of a particular attribute, there are
* four inputs that come into play:
* <ol>
* <li>Any attribute values in the given AttributeSet.
* <li>The style resource specified in the AttributeSet (named "style").
* <li>The default style specified by <var>defStyleAttr</var>.
* <li>The default style specified by <var>defStyleRes</var>.
* <li>The base values in this theme.
* </ol>
* <p>
* Each of these inputs is considered in-order, with the first listed taking
* precedence over the following ones. In other words, if in the
* AttributeSet you have supplied <code><Button * textColor="#ff000000"></code>
* , then the button's text will <em>always</em> be black, regardless of
* what is specified in any of the styles.
*
* @param context The Context the view is running in, through which it can
* access the current theme, resources, etc.
* @param attrs The attributes of the XML tag that is inflating the view.
* @param defStyleAttr An attribute in the current theme that contains a
* reference to a style resource that supplies default values for
* the view. Can be 0 to not look for defaults.
* @param defStyleRes A resource identifier of a style resource that
* supplies default values for the view, used only if
* defStyleAttr is 0 or can not be found in the theme. Can be 0
* to not look for defaults.
* @see #View(Context, AttributeSet, int)
*/
public View(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
this(context);
final TypedArray a = context.obtainStyledAttributes(
attrs, com.android.internal.R.styleable.View, defStyleAttr, defStyleRes);
if (mDebugViewAttributes) {
saveAttributeData(attrs, a);
}
Drawable background = null;
int leftPadding = -1;
int topPadding = -1;
int rightPadding = -1;
int bottomPadding = -1;
int startPadding = UNDEFINED_PADDING;
int endPadding = UNDEFINED_PADDING;
int padding = -1;
int viewFlagValues = 0;
int viewFlagMasks = 0;
boolean setScrollContainer = false;
int x = 0;
int y = 0;
float tx = 0;
float ty = 0;
float tz = 0;
float elevation = 0;
float rotation = 0;
float rotationX = 0;
float rotationY = 0;
float sx = 1f;
float sy = 1f;
boolean transformSet = false;
int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY;
int overScrollMode = mOverScrollMode;
boolean initializeScrollbars = false;
boolean initializeScrollIndicators = false;
boolean startPaddingDefined = false;
boolean endPaddingDefined = false;
boolean leftPaddingDefined = false;
boolean rightPaddingDefined = false;
final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion;
final int N = a.getIndexCount();
for (int i = 0; i < N; i++) {
int attr = a.getIndex(i);
switch (attr) {
case com.android.internal.R.styleable.View_background:
background = a.getDrawable(attr);
break;
case com.android.internal.R.styleable.View_padding:
padding = a.getDimensionPixelSize(attr, -1);
mUserPaddingLeftInitial = padding;
mUserPaddingRightInitial = padding;
leftPaddingDefined = true;
rightPaddingDefined = true;
break;
case com.android.internal.R.styleable.View_paddingLeft:
leftPadding = a.getDimensionPixelSize(attr, -1);
mUserPaddingLeftInitial = leftPadding;
leftPaddingDefined = true;
break;
case com.android.internal.R.styleable.View_paddingTop:
topPadding = a.getDimensionPixelSize(attr, -1);
break;
case com.android.internal.R.styleable.View_paddingRight:
rightPadding = a.getDimensionPixelSize(attr, -1);
mUserPaddingRightInitial = rightPadding;
rightPaddingDefined = true;
break;
case com.android.internal.R.styleable.View_paddingBottom:
bottomPadding = a.getDimensionPixelSize(attr, -1);
break;
case com.android.internal.R.styleable.View_paddingStart:
startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING);
startPaddingDefined = (startPadding != UNDEFINED_PADDING);
break;
case com.android.internal.R.styleable.View_paddingEnd:
endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING);
endPaddingDefined = (endPadding != UNDEFINED_PADDING);
break;
case com.android.internal.R.styleable.View_scrollX:
x = a.getDimensionPixelOffset(attr, 0);
break;
case com.android.internal.R.styleable.View_scrollY:
y = a.getDimensionPixelOffset(attr, 0);
break;
case com.android.internal.R.styleable.View_alpha:
setAlpha(a.getFloat(attr, 1f));
break;
case com.android.internal.R.styleable.View_transformPivotX:
setPivotX(a.getDimension(attr, 0));
break;
case com.android.internal.R.styleable.View_transformPivotY:
setPivotY(a.getDimension(attr, 0));
break;
case com.android.internal.R.styleable.View_translationX:
tx = a.getDimension(attr, 0);
transformSet = true;
break;
case com.android.internal.R.styleable.View_translationY:
ty = a.getDimension(attr, 0);
transformSet = true;
break;
case com.android.internal.R.styleable.View_translationZ:
tz = a.getDimension(attr, 0);
transformSet = true;
break;
case com.android.internal.R.styleable.View_elevation:
elevation = a.getDimension(attr, 0);
transformSet = true;
break;
case com.android.internal.R.styleable.View_rotation:
rotation = a.getFloat(attr, 0);
transformSet = true;
break;
case com.android.internal.R.styleable.View_rotationX:
rotationX = a.getFloat(attr, 0);
transformSet = true;
break;
case com.android.internal.R.styleable.View_rotationY:
rotationY = a.getFloat(attr, 0);
transformSet = true;
break;
case com.android.internal.R.styleable.View_scaleX:
sx = a.getFloat(attr, 1f);
transformSet = true;
break;
case com.android.internal.R.styleable.View_scaleY:
sy = a.getFloat(attr, 1f);
transformSet = true;
break;
case com.android.internal.R.styleable.View_id:
mID = a.getResourceId(attr, NO_ID);
break;
case com.android.internal.R.styleable.View_tag:
mTag = a.getText(attr);
break;
case com.android.internal.R.styleable.View_fitsSystemWindows:
if (a.getBoolean(attr, false)) {
viewFlagValues |= FITS_SYSTEM_WINDOWS;
viewFlagMasks |= FITS_SYSTEM_WINDOWS;
}
break;
case com.android.internal.R.styleable.View_focusable:
if (a.getBoolean(attr, false)) {
viewFlagValues |= FOCUSABLE;
viewFlagMasks |= FOCUSABLE_MASK;
}
break;
case com.android.internal.R.styleable.View_focusableInTouchMode:
if (a.getBoolean(attr, false)) {
viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE;
viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK;
}
break;
case com.android.internal.R.styleable.View_clickable:
if (a.getBoolean(attr, false)) {
viewFlagValues |= CLICKABLE;
viewFlagMasks |= CLICKABLE;
}
break;
case com.android.internal.R.styleable.View_longClickable:
if (a.getBoolean(attr, false)) {
viewFlagValues |= LONG_CLICKABLE;
viewFlagMasks |= LONG_CLICKABLE;
}
break;
case com.android.internal.R.styleable.View_contextClickable:
if (a.getBoolean(attr, false)) {
viewFlagValues |= CONTEXT_CLICKABLE;
viewFlagMasks |= CONTEXT_CLICKABLE;
}
break;
case com.android.internal.R.styleable.View_saveEnabled:
if (!a.getBoolean(attr, true)) {
viewFlagValues |= SAVE_DISABLED;
viewFlagMasks |= SAVE_DISABLED_MASK;
}
break;
case com.android.internal.R.styleable.View_duplicateParentState:
if (a.getBoolean(attr, false)) {
viewFlagValues |= DUPLICATE_PARENT_STATE;
viewFlagMasks |= DUPLICATE_PARENT_STATE;
}
break;
case com.android.internal.R.styleable.View_visibility:
final int visibility = a.getInt(attr, 0);
if (visibility != 0) {
viewFlagValues |= VISIBILITY_FLAGS[visibility];
viewFlagMasks |= VISIBILITY_MASK;
}
break;
case com.android.internal.R.styleable.View_layoutDirection:
// Clear any layout direction flags (included resolved bits) already set
mPrivateFlags2 &=
~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK);
// Set the layout direction flags depending on the value of the attribute
final int layoutDirection = a.getInt(attr, -1);
final int value = (layoutDirection != -1) ?
LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT;
mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT);
break;
case com.android.internal.R.styleable.View_drawingCacheQuality:
final int cacheQuality = a.getInt(attr, 0);
if (cacheQuality != 0) {
viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality];
viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK;
}
break;
case com.android.internal.R.styleable.View_contentDescription:
setContentDescription(a.getString(attr));
break;
case com.android.internal.R.styleable.View_accessibilityTraversalBefore:
setAccessibilityTraversalBefore(a.getResourceId(attr, NO_ID));
break;
case com.android.internal.R.styleable.View_accessibilityTraversalAfter:
setAccessibilityTraversalAfter(a.getResourceId(attr, NO_ID));
break;
case com.android.internal.R.styleable.View_labelFor:
setLabelFor(a.getResourceId(attr, NO_ID));
break;
case com.android.internal.R.styleable.View_soundEffectsEnabled:
if (!a.getBoolean(attr, true)) {
viewFlagValues &= ~SOUND_EFFECTS_ENABLED;
viewFlagMasks |= SOUND_EFFECTS_ENABLED;
}
break;
case com.android.internal.R.styleable.View_hapticFeedbackEnabled:
if (!a.getBoolean(attr, true)) {
viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED;
viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED;
}
break;
case R.styleable.View_scrollbars:
final int scrollbars = a.getInt(attr, SCROLLBARS_NONE);
if (scrollbars != SCROLLBARS_NONE) {
viewFlagValues |= scrollbars;
viewFlagMasks |= SCROLLBARS_MASK;
initializeScrollbars = true;
}
break;
//noinspection deprecation
case R.styleable.View_fadingEdge:
if (targetSdkVersion >= ICE_CREAM_SANDWICH) {
// Ignore the attribute starting with ICS
break;
}
// With builds < ICS, fall through and apply fading edges
case R.styleable.View_requiresFadingEdge:
final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE);
if (fadingEdge != FADING_EDGE_NONE) {
viewFlagValues |= fadingEdge;
viewFlagMasks |= FADING_EDGE_MASK;
initializeFadingEdgeInternal(a);
}
break;
case R.styleable.View_scrollbarStyle:
scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY);
if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK;
viewFlagMasks |= SCROLLBARS_STYLE_MASK;
}
break;
case R.styleable.View_isScrollContainer:
setScrollContainer = true;
if (a.getBoolean(attr, false)) {
setScrollContainer(true);
}
break;
case com.android.internal.R.styleable.View_keepScreenOn:
if (a.getBoolean(attr, false)) {
viewFlagValues |= KEEP_SCREEN_ON;
viewFlagMasks |= KEEP_SCREEN_ON;
}
break;
case R.styleable.View_filterTouchesWhenObscured:
if (a.getBoolean(attr, false)) {
viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED;
viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED;
}
break;
case R.styleable.View_nextFocusLeft:
mNextFocusLeftId = a.getResourceId(attr, View.NO_ID);
break;
case R.styleable.View_nextFocusRight:
mNextFocusRightId = a.getResourceId(attr, View.NO_ID);
break;
case R.styleable.View_nextFocusUp:
mNextFocusUpId = a.getResourceId(attr, View.NO_ID);
break;
case R.styleable.View_nextFocusDown:
mNextFocusDownId = a.getResourceId(attr, View.NO_ID);
break;
case R.styleable.View_nextFocusForward:
mNextFocusForwardId = a.getResourceId(attr, View.NO_ID);
break;
case R.styleable.View_minWidth:
mMinWidth = a.getDimensionPixelSize(attr, 0);
break;
case R.styleable.View_minHeight:
mMinHeight = a.getDimensionPixelSize(attr, 0);
break;
case R.styleable.View_onClick:
if (context.isRestricted()) {
throw new IllegalStateException("The android:onClick attribute cannot "
+ "be used within a restricted context");
}
final String handlerName = a.getString(attr);
if (handlerName != null) {
setOnClickListener(new DeclaredOnClickListener(this, handlerName));
}
break;
case R.styleable.View_overScrollMode:
overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS);
break;
case R.styleable.View_verticalScrollbarPosition:
mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT);
break;
case R.styleable.View_layerType:
setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null);
break;
case R.styleable.View_textDirection:
// Clear any text direction flag already set
mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK;
// Set the text direction flags depending on the value of the attribute
final int textDirection = a.getInt(attr, -1);
if (textDirection != -1) {
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection];
}
break;
case R.styleable.View_textAlignment:
// Clear any text alignment flag already set
mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK;
// Set the text alignment flag depending on the value of the attribute
final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT);
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment];
break;
case R.styleable.View_importantForAccessibility:
setImportantForAccessibility(a.getInt(attr,
IMPORTANT_FOR_ACCESSIBILITY_DEFAULT));
break;
case R.styleable.View_accessibilityLiveRegion:
setAccessibilityLiveRegion(a.getInt(attr, ACCESSIBILITY_LIVE_REGION_DEFAULT));
break;
case R.styleable.View_transitionName:
setTransitionName(a.getString(attr));
break;
case R.styleable.View_nestedScrollingEnabled:
setNestedScrollingEnabled(a.getBoolean(attr, false));
break;
case R.styleable.View_stateListAnimator:
setStateListAnimator(AnimatorInflater.loadStateListAnimator(context,
a.getResourceId(attr, 0)));
break;
case R.styleable.View_backgroundTint:
// This will get applied later during setBackground().
if (mBackgroundTint == null) {
mBackgroundTint = new TintInfo();
}
mBackgroundTint.mTintList = a.getColorStateList(
R.styleable.View_backgroundTint);
mBackgroundTint.mHasTintList = true;
break;
case R.styleable.View_backgroundTintMode:
// This will get applied later during setBackground().
if (mBackgroundTint == null) {
mBackgroundTint = new TintInfo();
}
mBackgroundTint.mTintMode = Drawable.parseTintMode(a.getInt(
R.styleable.View_backgroundTintMode, -1), null);
mBackgroundTint.mHasTintMode = true;
break;
case R.styleable.View_outlineProvider:
setOutlineProviderFromAttribute(a.getInt(R.styleable.View_outlineProvider,
PROVIDER_BACKGROUND));
break;
case R.styleable.View_foreground:
if (targetSdkVersion >= VERSION_CODES.M || this instanceof FrameLayout) {
setForeground(a.getDrawable(attr));
}
break;
case R.styleable.View_foregroundGravity:
if (targetSdkVersion >= VERSION_CODES.M || this instanceof FrameLayout) {
setForegroundGravity(a.getInt(attr, Gravity.NO_GRAVITY));
}
break;
case R.styleable.View_foregroundTintMode:
if (targetSdkVersion >= VERSION_CODES.M || this instanceof FrameLayout) {
setForegroundTintMode(Drawable.parseTintMode(a.getInt(attr, -1), null));
}
break;
case R.styleable.View_foregroundTint:
if (targetSdkVersion >= VERSION_CODES.M || this instanceof FrameLayout) {
setForegroundTintList(a.getColorStateList(attr));
}
break;
case R.styleable.View_foregroundInsidePadding:
if (targetSdkVersion >= VERSION_CODES.M || this instanceof FrameLayout) {
if (mForegroundInfo == null) {
mForegroundInfo = new ForegroundInfo();
}
mForegroundInfo.mInsidePadding = a.getBoolean(attr,
mForegroundInfo.mInsidePadding);
}
break;
case R.styleable.View_scrollIndicators:
final int scrollIndicators =
(a.getInt(attr, 0) << SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT)
& SCROLL_INDICATORS_PFLAG3_MASK;
if (scrollIndicators != 0) {
mPrivateFlags3 |= scrollIndicators;
initializeScrollIndicators = true;
}
break;
case R.styleable.View_pointerIcon:
final int resourceId = a.getResourceId(attr, 0);
if (resourceId != 0) {
setPointerIcon(PointerIcon.load(
context.getResources(), resourceId));
} else {
final int pointerType = a.getInt(attr, PointerIcon.TYPE_NOT_SPECIFIED);
if (pointerType != PointerIcon.TYPE_NOT_SPECIFIED) {
setPointerIcon(PointerIcon.getSystemIcon(context, pointerType));
}
}
break;
case R.styleable.View_forceHasOverlappingRendering:
if (a.peekValue(attr) != null) {
forceHasOverlappingRendering(a.getBoolean(attr, true));
}
break;
}
}
setOverScrollMode(overScrollMode);
// Cache start/end user padding as we cannot fully resolve padding here (we dont have yet
// the resolved layout direction). Those cached values will be used later during padding
// resolution.
mUserPaddingStart = startPadding;
mUserPaddingEnd = endPadding;
if (background != null) {
setBackground(background);
}
// setBackground above will record that padding is currently provided by the background.
// If we have padding specified via xml, record that here instead and use it.
mLeftPaddingDefined = leftPaddingDefined;
mRightPaddingDefined = rightPaddingDefined;
if (padding >= 0) {
leftPadding = padding;
topPadding = padding;
rightPadding = padding;
bottomPadding = padding;
mUserPaddingLeftInitial = padding;
mUserPaddingRightInitial = padding;
}
if (isRtlCompatibilityMode()) {
// RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case.
// left / right padding are used if defined (meaning here nothing to do). If they are not
// defined and start / end padding are defined (e.g. in Frameworks resources), then we use
// start / end and resolve them as left / right (layout direction is not taken into account).
// Padding from the background drawable is stored at this point in mUserPaddingLeftInitial
// and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if
// defined.
if (!mLeftPaddingDefined && startPaddingDefined) {
leftPadding = startPadding;
}
mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial;
if (!mRightPaddingDefined && endPaddingDefined) {
rightPadding = endPadding;
}
mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial;
} else {
// Jelly Bean MR1 and after case: if start/end defined, they will override any left/right
// values defined. Otherwise, left /right values are used.
// Padding from the background drawable is stored at this point in mUserPaddingLeftInitial
// and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if
// defined.
final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined;
if (mLeftPaddingDefined && !hasRelativePadding) {
mUserPaddingLeftInitial = leftPadding;
}
if (mRightPaddingDefined && !hasRelativePadding) {
mUserPaddingRightInitial = rightPadding;
}
}
internalSetPadding(
mUserPaddingLeftInitial,
topPadding >= 0 ? topPadding : mPaddingTop,
mUserPaddingRightInitial,
bottomPadding >= 0 ? bottomPadding : mPaddingBottom);
if (viewFlagMasks != 0) {
setFlags(viewFlagValues, viewFlagMasks);
}
if (initializeScrollbars) {
initializeScrollbarsInternal(a);
}
if (initializeScrollIndicators) {
initializeScrollIndicatorsInternal();
}
a.recycle();
// Needs to be called after mViewFlags is set
if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) {
recomputePadding();
}
if (x != 0 || y != 0) {
scrollTo(x, y);
}
if (transformSet) {
setTranslationX(tx);
setTranslationY(ty);
setTranslationZ(tz);
setElevation(elevation);
setRotation(rotation);
setRotationX(rotationX);
setRotationY(rotationY);
setScaleX(sx);
setScaleY(sy);
}
if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) {
setScrollContainer(true);
}
computeOpaqueFlags();
}
/**
* An implementation of OnClickListener that attempts to lazily load a
* named click handling method from a parent or ancestor context.
*/
private static class DeclaredOnClickListener implements OnClickListener {
private final View mHostView;
private final String mMethodName;
private Method mResolvedMethod;
private Context mResolvedContext;
public DeclaredOnClickListener(@NonNull View hostView, @NonNull String methodName) {
mHostView = hostView;
mMethodName = methodName;
}
@Override
public void onClick(@NonNull View v) {
if (mResolvedMethod == null) {
resolveMethod(mHostView.getContext(), mMethodName);
}
try {
mResolvedMethod.invoke(mResolvedContext, v);
} catch (IllegalAccessException e) {
throw new IllegalStateException(
"Could not execute non-public method for android:onClick", e);
} catch (InvocationTargetException e) {
throw new IllegalStateException(
"Could not execute method for android:onClick", e);
}
}
@NonNull
private void resolveMethod(@Nullable Context context, @NonNull String name) {
while (context != null) {
try {
if (!context.isRestricted()) {
final Method method = context.getClass().getMethod(mMethodName, View.class);
if (method != null) {
mResolvedMethod = method;
mResolvedContext = context;
return;
}
}
} catch (NoSuchMethodException e) {
// Failed to find method, keep searching up the hierarchy.
}
if (context instanceof ContextWrapper) {
context = ((ContextWrapper) context).getBaseContext();
} else {
// Can't search up the hierarchy, null out and fail.
context = null;
}
}
final int id = mHostView.getId();
final String idText = id == NO_ID ? "" : " with id '"
+ mHostView.getContext().getResources().getResourceEntryName(id) + "'";
throw new IllegalStateException("Could not find method " + mMethodName
+ "(View) in a parent or ancestor Context for android:onClick "
+ "attribute defined on view " + mHostView.getClass() + idText);
}
}
/**
* Non-public constructor for use in testing
*/
View() {
mResources = null;
mRenderNode = RenderNode.create(getClass().getName(), this);
}
private static SparseArray<String> getAttributeMap() {
if (mAttributeMap == null) {
mAttributeMap = new SparseArray<>();
}
return mAttributeMap;
}
private void saveAttributeData(@Nullable AttributeSet attrs, @NonNull TypedArray t) {
final int attrsCount = attrs == null ? 0 : attrs.getAttributeCount();
final int indexCount = t.getIndexCount();
final String[] attributes = new String[(attrsCount + indexCount) * 2];
int i = 0;
// Store raw XML attributes.
for (int j = 0; j < attrsCount; ++j) {
attributes[i] = attrs.getAttributeName(j);
attributes[i + 1] = attrs.getAttributeValue(j);
i += 2;
}
// Store resolved styleable attributes.
final Resources res = t.getResources();
final SparseArray<String> attributeMap = getAttributeMap();
for (int j = 0; j < indexCount; ++j) {
final int index = t.getIndex(j);
if (!t.hasValueOrEmpty(index)) {
// Value is undefined. Skip it.
continue;
}
final int resourceId = t.getResourceId(index, 0);
if (resourceId == 0) {
// Value is not a reference. Skip it.
continue;
}
String resourceName = attributeMap.get(resourceId);
if (resourceName == null) {
try {
resourceName = res.getResourceName(resourceId);
} catch (Resources.NotFoundException e) {
resourceName = "0x" + Integer.toHexString(resourceId);
}
attributeMap.put(resourceId, resourceName);
}
attributes[i] = resourceName;
attributes[i + 1] = t.getString(index);
i += 2;
}
// Trim to fit contents.
final String[] trimmed = new String[i];
System.arraycopy(attributes, 0, trimmed, 0, i);
mAttributes = trimmed;
}
public String toString() {
StringBuilder out = new StringBuilder(128);
out.append(getClass().getName());
out.append('{');
out.append(Integer.toHexString(System.identityHashCode(this)));
out.append(' ');
switch (mViewFlags&VISIBILITY_MASK) {
case VISIBLE: out.append('V'); break;
case INVISIBLE: out.append('I'); break;
case GONE: out.append('G'); break;
default: out.append('.'); break;
}
out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.');
out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.');
out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D');
out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.');
out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.');
out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.');
out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.');
out.append((mViewFlags&CONTEXT_CLICKABLE) != 0 ? 'X' : '.');
out.append(' ');
out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.');
out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.');
out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.');
if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) {
out.append('p');
} else {
out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.');
}
out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.');
out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.');
out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.');
out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.');
out.append(' ');
out.append(mLeft);
out.append(',');
out.append(mTop);
out.append('-');
out.append(mRight);
out.append(',');
out.append(mBottom);
final int id = getId();
if (id != NO_ID) {
out.append(" #");
out.append(Integer.toHexString(id));
final Resources r = mResources;
if (id > 0 && Resources.resourceHasPackage(id) && r != null) {
try {
String pkgname;
switch (id&0xff000000) {
case 0x7f000000:
pkgname="app";
break;
case 0x01000000:
pkgname="android";
break;
default:
pkgname = r.getResourcePackageName(id);
break;
}
String typename = r.getResourceTypeName(id);
String entryname = r.getResourceEntryName(id);
out.append(" ");
out.append(pkgname);
out.append(":");
out.append(typename);
out.append("/");
out.append(entryname);
} catch (Resources.NotFoundException e) {
}
}
}
out.append("}");
return out.toString();
}
/**
* <p>
* Initializes the fading edges from a given set of styled attributes. This
* method should be called by subclasses that need fading edges and when an
* instance of these subclasses is created programmatically rather than
* being inflated from XML. This method is automatically called when the XML
* is inflated.
* </p>
*
* @param a the styled attributes set to initialize the fading edges from
*
* @removed
*/
protected void initializeFadingEdge(TypedArray a) {
// This method probably shouldn't have been included in the SDK to begin with.
// It relies on 'a' having been initialized using an attribute filter array that is
// not publicly available to the SDK. The old method has been renamed
// to initializeFadingEdgeInternal and hidden for framework use only;
// this one initializes using defaults to make it safe to call for apps.
TypedArray arr = mContext.obtainStyledAttributes(com.android.internal.R.styleable.View);
initializeFadingEdgeInternal(arr);
arr.recycle();
}
/**
* <p>
* Initializes the fading edges from a given set of styled attributes. This
* method should be called by subclasses that need fading edges and when an
* instance of these subclasses is created programmatically rather than
* being inflated from XML. This method is automatically called when the XML
* is inflated.
* </p>
*
* @param a the styled attributes set to initialize the fading edges from
* @hide This is the real method; the public one is shimmed to be safe to call from apps.
*/
protected void initializeFadingEdgeInternal(TypedArray a) {
initScrollCache();
mScrollCache.fadingEdgeLength = a.getDimensionPixelSize(
R.styleable.View_fadingEdgeLength,
ViewConfiguration.get(mContext).getScaledFadingEdgeLength());
}
/**
* Returns the size of the vertical faded edges used to indicate that more
* content in this view is visible.
*
* @return The size in pixels of the vertical faded edge or 0 if vertical
* faded edges are not enabled for this view.
* @attr ref android.R.styleable#View_fadingEdgeLength
*/
public int getVerticalFadingEdgeLength() {
if (isVerticalFadingEdgeEnabled()) {
ScrollabilityCache cache = mScrollCache;
if (cache != null) {
return cache.fadingEdgeLength;
}
}
return 0;
}
/**
* Set the size of the faded edge used to indicate that more content in this
* view is available. Will not change whether the fading edge is enabled; use
* {@link #setVerticalFadingEdgeEnabled(boolean)} or
* {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge
* for the vertical or horizontal fading edges.
*
* @param length The size in pixels of the faded edge used to indicate that more
* content in this view is visible.
*/
public void setFadingEdgeLength(int length) {
initScrollCache();
mScrollCache.fadingEdgeLength = length;
}
/**
* Returns the size of the horizontal faded edges used to indicate that more
* content in this view is visible.
*
* @return The size in pixels of the horizontal faded edge or 0 if horizontal
* faded edges are not enabled for this view.
* @attr ref android.R.styleable#View_fadingEdgeLength
*/
public int getHorizontalFadingEdgeLength() {
if (isHorizontalFadingEdgeEnabled()) {
ScrollabilityCache cache = mScrollCache;
if (cache != null) {
return cache.fadingEdgeLength;
}
}
return 0;
}
/**
* Returns the width of the vertical scrollbar.
*
* @return The width in pixels of the vertical scrollbar or 0 if there
* is no vertical scrollbar.
*/
public int getVerticalScrollbarWidth() {
ScrollabilityCache cache = mScrollCache;
if (cache != null) {
ScrollBarDrawable scrollBar = cache.scrollBar;
if (scrollBar != null) {
int size = scrollBar.getSize(true);
if (size <= 0) {
size = cache.scrollBarSize;
}
return size;
}
return 0;
}
return 0;
}
/**
* Returns the height of the horizontal scrollbar.
*
* @return The height in pixels of the horizontal scrollbar or 0 if
* there is no horizontal scrollbar.
*/
protected int getHorizontalScrollbarHeight() {
ScrollabilityCache cache = mScrollCache;
if (cache != null) {
ScrollBarDrawable scrollBar = cache.scrollBar;
if (scrollBar != null) {
int size = scrollBar.getSize(false);
if (size <= 0) {
size = cache.scrollBarSize;
}
return size;
}
return 0;
}
return 0;
}
/**
* <p>
* Initializes the scrollbars from a given set of styled attributes. This
* method should be called by subclasses that need scrollbars and when an
* instance of these subclasses is created programmatically rather than
* being inflated from XML. This method is automatically called when the XML
* is inflated.
* </p>
*
* @param a the styled attributes set to initialize the scrollbars from
*
* @removed
*/
protected void initializeScrollbars(TypedArray a) {
// It's not safe to use this method from apps. The parameter 'a' must have been obtained
// using the View filter array which is not available to the SDK. As such, internal
// framework usage now uses initializeScrollbarsInternal and we grab a default
// TypedArray with the right filter instead here.
TypedArray arr = mContext.obtainStyledAttributes(com.android.internal.R.styleable.View);
initializeScrollbarsInternal(arr);
// We ignored the method parameter. Recycle the one we actually did use.
arr.recycle();
}
/**
* <p>
* Initializes the scrollbars from a given set of styled attributes. This
* method should be called by subclasses that need scrollbars and when an
* instance of these subclasses is created programmatically rather than
* being inflated from XML. This method is automatically called when the XML
* is inflated.
* </p>
*
* @param a the styled attributes set to initialize the scrollbars from
* @hide
*/
protected void initializeScrollbarsInternal(TypedArray a) {
initScrollCache();
final ScrollabilityCache scrollabilityCache = mScrollCache;
if (scrollabilityCache.scrollBar == null) {
scrollabilityCache.scrollBar = new ScrollBarDrawable();
scrollabilityCache.scrollBar.setState(getDrawableState());
scrollabilityCache.scrollBar.setCallback(this);
}
final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true);
if (!fadeScrollbars) {
scrollabilityCache.state = ScrollabilityCache.ON;
}
scrollabilityCache.fadeScrollBars = fadeScrollbars;
scrollabilityCache.scrollBarFadeDuration = a.getInt(
R.styleable.View_scrollbarFadeDuration, ViewConfiguration
.getScrollBarFadeDuration());
scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt(
R.styleable.View_scrollbarDefaultDelayBeforeFade,
ViewConfiguration.getScrollDefaultDelay());
scrollabilityCache.scrollBarSize = a.getDimensionPixelSize(
com.android.internal.R.styleable.View_scrollbarSize,
ViewConfiguration.get(mContext).getScaledScrollBarSize());
Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal);
scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track);
Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal);
if (thumb != null) {
scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb);
}
boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack,
false);
if (alwaysDraw) {
scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true);
}
track = a.getDrawable(R.styleable.View_scrollbarTrackVertical);
scrollabilityCache.scrollBar.setVerticalTrackDrawable(track);
thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical);
if (thumb != null) {
scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb);
}
alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack,
false);
if (alwaysDraw) {
scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true);
}
// Apply layout direction to the new Drawables if needed
final int layoutDirection = getLayoutDirection();
if (track != null) {
track.setLayoutDirection(layoutDirection);
}
if (thumb != null) {
thumb.setLayoutDirection(layoutDirection);
}
// Re-apply user/background padding so that scrollbar(s) get added
resolvePadding();
}
private void initializeScrollIndicatorsInternal() {
// Some day maybe we'll break this into top/left/start/etc. and let the
// client control it. Until then, you can have any scroll indicator you
// want as long as it's a 1dp foreground-colored rectangle.
if (mScrollIndicatorDrawable == null) {
mScrollIndicatorDrawable = mContext.getDrawable(R.drawable.scroll_indicator_material);
}
}
/**
* <p>
* Initalizes the scrollability cache if necessary.
* </p>
*/
private void initScrollCache() {
if (mScrollCache == null) {
mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this);
}
}
private ScrollabilityCache getScrollCache() {
initScrollCache();
return mScrollCache;
}
/**
* Set the position of the vertical scroll bar. Should be one of
* {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or
* {@link #SCROLLBAR_POSITION_RIGHT}.
*
* @param position Where the vertical scroll bar should be positioned.
*/
public void setVerticalScrollbarPosition(int position) {
if (mVerticalScrollbarPosition != position) {
mVerticalScrollbarPosition = position;
computeOpaqueFlags();
resolvePadding();
}
}
/**
* @return The position where the vertical scroll bar will show, if applicable.
* @see #setVerticalScrollbarPosition(int)
*/
public int getVerticalScrollbarPosition() {
return mVerticalScrollbarPosition;
}
boolean isOnScrollbar(float x, float y) {
if (mScrollCache == null) {
return false;
}
x += getScrollX();
y += getScrollY();
if (isVerticalScrollBarEnabled() && !isVerticalScrollBarHidden()) {
final Rect bounds = mScrollCache.mScrollBarBounds;
getVerticalScrollBarBounds(bounds);
if (bounds.contains((int)x, (int)y)) {
return true;
}
}
if (isHorizontalScrollBarEnabled()) {
final Rect bounds = mScrollCache.mScrollBarBounds;
getHorizontalScrollBarBounds(bounds);
if (bounds.contains((int)x, (int)y)) {
return true;
}
}
return false;
}
boolean isOnScrollbarThumb(float x, float y) {
return isOnVerticalScrollbarThumb(x, y) || isOnHorizontalScrollbarThumb(x, y);
}
private boolean isOnVerticalScrollbarThumb(float x, float y) {
if (mScrollCache == null) {
return false;
}
if (isVerticalScrollBarEnabled() && !isVerticalScrollBarHidden()) {
x += getScrollX();
y += getScrollY();
final Rect bounds = mScrollCache.mScrollBarBounds;
getVerticalScrollBarBounds(bounds);
final int range = computeVerticalScrollRange();
final int offset = computeVerticalScrollOffset();
final int extent = computeVerticalScrollExtent();
final int thumbLength = ScrollBarUtils.getThumbLength(bounds.height(), bounds.width(),
extent, range);
final int thumbOffset = ScrollBarUtils.getThumbOffset(bounds.height(), thumbLength,
extent, range, offset);
final int thumbTop = bounds.top + thumbOffset;
if (x >= bounds.left && x <= bounds.right && y >= thumbTop
&& y <= thumbTop + thumbLength) {
return true;
}
}
return false;
}
private boolean isOnHorizontalScrollbarThumb(float x, float y) {
if (mScrollCache == null) {
return false;
}
if (isHorizontalScrollBarEnabled()) {
x += getScrollX();
y += getScrollY();
final Rect bounds = mScrollCache.mScrollBarBounds;
getHorizontalScrollBarBounds(bounds);
final int range = computeHorizontalScrollRange();
final int offset = computeHorizontalScrollOffset();
final int extent = computeHorizontalScrollExtent();
final int thumbLength = ScrollBarUtils.getThumbLength(bounds.width(), bounds.height(),
extent, range);
final int thumbOffset = ScrollBarUtils.getThumbOffset(bounds.width(), thumbLength,
extent, range, offset);
final int thumbLeft = bounds.left + thumbOffset;
if (x >= thumbLeft && x <= thumbLeft + thumbLength && y >= bounds.top
&& y <= bounds.bottom) {
return true;
}
}
return false;
}
boolean isDraggingScrollBar() {
return mScrollCache != null
&& mScrollCache.mScrollBarDraggingState != ScrollabilityCache.NOT_DRAGGING;
}
/**
* Sets the state of all scroll indicators.
* <p>
* See {@link #setScrollIndicators(int, int)} for usage information.
*
* @param indicators a bitmask of indicators that should be enabled, or
* {@code 0} to disable all indicators
* @see #setScrollIndicators(int, int)
* @see #getScrollIndicators()
* @attr ref android.R.styleable#View_scrollIndicators
*/
public void setScrollIndicators(@ScrollIndicators int indicators) {
setScrollIndicators(indicators,
SCROLL_INDICATORS_PFLAG3_MASK >>> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT);
}
/**
* Sets the state of the scroll indicators specified by the mask. To change
* all scroll indicators at once, see {@link #setScrollIndicators(int)}.
* <p>
* When a scroll indicator is enabled, it will be displayed if the view
* can scroll in the direction of the indicator.
* <p>
* Multiple indicator types may be enabled or disabled by passing the
* logical OR of the desired types. If multiple types are specified, they
* will all be set to the same enabled state.
* <p>
* For example, to enable the top scroll indicatorExample: {@code setScrollIndicators
*
* @param indicators the indicator direction, or the logical OR of multiple
* indicator directions. One or more of:
* <ul>
* <li>{@link #SCROLL_INDICATOR_TOP}</li>
* <li>{@link #SCROLL_INDICATOR_BOTTOM}</li>
* <li>{@link #SCROLL_INDICATOR_LEFT}</li>
* <li>{@link #SCROLL_INDICATOR_RIGHT}</li>
* <li>{@link #SCROLL_INDICATOR_START}</li>
* <li>{@link #SCROLL_INDICATOR_END}</li>
* </ul>
* @see #setScrollIndicators(int)
* @see #getScrollIndicators()
* @attr ref android.R.styleable#View_scrollIndicators
*/
public void setScrollIndicators(@ScrollIndicators int indicators, @ScrollIndicators int mask) {
// Shift and sanitize mask.
mask <<= SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
mask &= SCROLL_INDICATORS_PFLAG3_MASK;
// Shift and mask indicators.
indicators <<= SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
indicators &= mask;
// Merge with non-masked flags.
final int updatedFlags = indicators | (mPrivateFlags3 & ~mask);
if (mPrivateFlags3 != updatedFlags) {
mPrivateFlags3 = updatedFlags;
if (indicators != 0) {
initializeScrollIndicatorsInternal();
}
invalidate();
}
}
/**
* Returns a bitmask representing the enabled scroll indicators.
* <p>
* For example, if the top and left scroll indicators are enabled and all
* other indicators are disabled, the return value will be
* {@code View.SCROLL_INDICATOR_TOP | View.SCROLL_INDICATOR_LEFT}.
* <p>
* To check whether the bottom scroll indicator is enabled, use the value
* of {@code (getScrollIndicators() & View.SCROLL_INDICATOR_BOTTOM) != 0}.
*
* @return a bitmask representing the enabled scroll indicators
*/
@ScrollIndicators
public int getScrollIndicators() {
return (mPrivateFlags3 & SCROLL_INDICATORS_PFLAG3_MASK)
>>> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
}
ListenerInfo getListenerInfo() {
if (mListenerInfo != null) {
return mListenerInfo;
}
mListenerInfo = new ListenerInfo();
return mListenerInfo;
}
/**
* Register a callback to be invoked when the scroll X or Y positions of
* this view change.
* <p>
* <b>Note:</b> Some views handle scrolling independently from View and may
* have their own separate listeners for scroll-type events. For example,
* {@link android.widget.ListView ListView} allows clients to register an
* {@link android.widget.ListView#setOnScrollListener(android.widget.AbsListView.OnScrollListener) AbsListView.OnScrollListener}
* to listen for changes in list scroll position.
*
* @param l The listener to notify when the scroll X or Y position changes.
* @see android.view.View#getScrollX()
* @see android.view.View#getScrollY()
*/
public void setOnScrollChangeListener(OnScrollChangeListener l) {
getListenerInfo().mOnScrollChangeListener = l;
}
/**
* Register a callback to be invoked when focus of this view changed.
*
* @param l The callback that will run.
*/
public void setOnFocusChangeListener(OnFocusChangeListener l) {
getListenerInfo().mOnFocusChangeListener = l;
}
/**
* Add a listener that will be called when the bounds of the view change due to
* layout processing.
*
* @param listener The listener that will be called when layout bounds change.
*/
public void addOnLayoutChangeListener(OnLayoutChangeListener listener) {
ListenerInfo li = getListenerInfo();
if (li.mOnLayoutChangeListeners == null) {
li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>();
}
if (!li.mOnLayoutChangeListeners.contains(listener)) {
li.mOnLayoutChangeListeners.add(listener);
}
}
/**
* Remove a listener for layout changes.
*
* @param listener The listener for layout bounds change.
*/
public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) {
ListenerInfo li = mListenerInfo;
if (li == null || li.mOnLayoutChangeListeners == null) {
return;
}
li.mOnLayoutChangeListeners.remove(listener);
}
/**
* Add a listener for attach state changes.
*
* This listener will be called whenever this view is attached or detached
* from a window. Remove the listener using
* {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}.
*
* @param listener Listener to attach
* @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener)
*/
public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) {
ListenerInfo li = getListenerInfo();
if (li.mOnAttachStateChangeListeners == null) {
li.mOnAttachStateChangeListeners
= new CopyOnWriteArrayList<OnAttachStateChangeListener>();
}
li.mOnAttachStateChangeListeners.add(listener);
}
/**
* Remove a listener for attach state changes. The listener will receive no further
* notification of window attach/detach events.
*
* @param listener Listener to remove
* @see #addOnAttachStateChangeListener(OnAttachStateChangeListener)
*/
public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) {
ListenerInfo li = mListenerInfo;
if (li == null || li.mOnAttachStateChangeListeners == null) {
return;
}
li.mOnAttachStateChangeListeners.remove(listener);
}
/**
* Returns the focus-change callback registered for this view.
*
* @return The callback, or null if one is not registered.
*/
public OnFocusChangeListener getOnFocusChangeListener() {
ListenerInfo li = mListenerInfo;
return li != null ? li.mOnFocusChangeListener : null;
}
/**
* Register a callback to be invoked when this view is clicked. If this view is not
* clickable, it becomes clickable.
*
* @param l The callback that will run
*
* @see #setClickable(boolean)
*/
public void setOnClickListener(@Nullable OnClickListener l) {
if (!isClickable()) {
setClickable(true);
}
getListenerInfo().mOnClickListener = l;
}
/**
* Return whether this view has an attached OnClickListener. Returns
* true if there is a listener, false if there is none.
*/
public boolean hasOnClickListeners() {
ListenerInfo li = mListenerInfo;
return (li != null && li.mOnClickListener != null);
}
/**
* Register a callback to be invoked when this view is clicked and held. If this view is not
* long clickable, it becomes long clickable.
*
* @param l The callback that will run
*
* @see #setLongClickable(boolean)
*/
public void setOnLongClickListener(@Nullable OnLongClickListener l) {
if (!isLongClickable()) {
setLongClickable(true);
}
getListenerInfo().mOnLongClickListener = l;
}
/**
* Register a callback to be invoked when this view is context clicked. If the view is not
* context clickable, it becomes context clickable.
*
* @param l The callback that will run
* @see #setContextClickable(boolean)
*/
public void setOnContextClickListener(@Nullable OnContextClickListener l) {
if (!isContextClickable()) {
setContextClickable(true);
}
getListenerInfo().mOnContextClickListener = l;
}
/**
* Register a callback to be invoked when the context menu for this view is
* being built. If this view is not long clickable, it becomes long clickable.
*
* @param l The callback that will run
*
*/
public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) {
if (!isLongClickable()) {
setLongClickable(true);
}
getListenerInfo().mOnCreateContextMenuListener = l;
}
/**
* Set an observer to collect stats for each frame rendered for this view.
*
* @hide
*/
public void addFrameMetricsListener(Window window,
Window.OnFrameMetricsAvailableListener listener,
Handler handler) {
if (mAttachInfo != null) {
if (mAttachInfo.mHardwareRenderer != null) {
if (mFrameMetricsObservers == null) {
mFrameMetricsObservers = new ArrayList<>();
}
FrameMetricsObserver fmo = new FrameMetricsObserver(window,
handler.getLooper(), listener);
mFrameMetricsObservers.add(fmo);
mAttachInfo.mHardwareRenderer.addFrameMetricsObserver(fmo);
} else {
Log.w(VIEW_LOG_TAG, "View not hardware-accelerated. Unable to observe frame stats");
}
} else {
if (mFrameMetricsObservers == null) {
mFrameMetricsObservers = new ArrayList<>();
}
FrameMetricsObserver fmo = new FrameMetricsObserver(window,
handler.getLooper(), listener);
mFrameMetricsObservers.add(fmo);
}
}
/**
* Remove observer configured to collect frame stats for this view.
*
* @hide
*/
public void removeFrameMetricsListener(
Window.OnFrameMetricsAvailableListener listener) {
ThreadedRenderer renderer = getHardwareRenderer();
FrameMetricsObserver fmo = findFrameMetricsObserver(listener);
if (fmo == null) {
throw new IllegalArgumentException(
"attempt to remove OnFrameMetricsAvailableListener that was never added");
}
if (mFrameMetricsObservers != null) {
mFrameMetricsObservers.remove(fmo);
if (renderer != null) {
renderer.removeFrameMetricsObserver(fmo);
}
}
}
private void registerPendingFrameMetricsObservers() {
if (mFrameMetricsObservers != null) {
ThreadedRenderer renderer = getHardwareRenderer();
if (renderer != null) {
for (FrameMetricsObserver fmo : mFrameMetricsObservers) {
renderer.addFrameMetricsObserver(fmo);
}
} else {
Log.w(VIEW_LOG_TAG, "View not hardware-accelerated. Unable to observe frame stats");
}
}
}
private FrameMetricsObserver findFrameMetricsObserver(
Window.OnFrameMetricsAvailableListener listener) {
for (int i = 0; i < mFrameMetricsObservers.size(); i++) {
FrameMetricsObserver observer = mFrameMetricsObservers.get(i);
if (observer.mListener == listener) {
return observer;
}
}
return null;
}
/**
* Call this view's OnClickListener, if it is defined. Performs all normal
* actions associated with clicking: reporting accessibility event, playing
* a sound, etc.
*
* @return True there was an assigned OnClickListener that was called, false
* otherwise is returned.
*/
public boolean performClick() {
final boolean result;
final ListenerInfo li = mListenerInfo;
if (li != null && li.mOnClickListener != null) {
playSoundEffect(SoundEffectConstants.CLICK);
li.mOnClickListener.onClick(this);
result = true;
} else {
result = false;
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
return result;
}
/**
* Directly call any attached OnClickListener. Unlike {@link #performClick()},
* this only calls the listener, and does not do any associated clicking
* actions like reporting an accessibility event.
*
* @return True there was an assigned OnClickListener that was called, false
* otherwise is returned.
*/
public boolean callOnClick() {
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnClickListener != null) {
li.mOnClickListener.onClick(this);
return true;
}
return false;
}
/**
* Calls this view's OnLongClickListener, if it is defined. Invokes the
* context menu if the OnLongClickListener did not consume the event.
*
* @return {@code true} if one of the above receivers consumed the event,
* {@code false} otherwise
*/
public boolean performLongClick() {
return performLongClickInternal(mLongClickX, mLongClickY);
}
/**
* Calls this view's OnLongClickListener, if it is defined. Invokes the
* context menu if the OnLongClickListener did not consume the event,
* anchoring it to an (x,y) coordinate.
*
* @param x x coordinate of the anchoring touch event, or {@link Float#NaN}
* to disable anchoring
* @param y y coordinate of the anchoring touch event, or {@link Float#NaN}
* to disable anchoring
* @return {@code true} if one of the above receivers consumed the event,
* {@code false} otherwise
*/
public boolean performLongClick(float x, float y) {
mLongClickX = x;
mLongClickY = y;
final boolean handled = performLongClick();
mLongClickX = Float.NaN;
mLongClickY = Float.NaN;
return handled;
}
/**
* Calls this view's OnLongClickListener, if it is defined. Invokes the
* context menu if the OnLongClickListener did not consume the event,
* optionally anchoring it to an (x,y) coordinate.
*
* @param x x coordinate of the anchoring touch event, or {@link Float#NaN}
* to disable anchoring
* @param y y coordinate of the anchoring touch event, or {@link Float#NaN}
* to disable anchoring
* @return {@code true} if one of the above receivers consumed the event,
* {@code false} otherwise
*/
private boolean performLongClickInternal(float x, float y) {
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
boolean handled = false;
final ListenerInfo li = mListenerInfo;
if (li != null && li.mOnLongClickListener != null) {
handled = li.mOnLongClickListener.onLongClick(View.this);
}
if (!handled) {
final boolean isAnchored = !Float.isNaN(x) && !Float.isNaN(y);
handled = isAnchored ? showContextMenu(x, y) : showContextMenu();
}
if (handled) {
performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
}
return handled;
}
/**
* Call this view's OnContextClickListener, if it is defined.
*
* @param x the x coordinate of the context click
* @param y the y coordinate of the context click
* @return True if there was an assigned OnContextClickListener that consumed the event, false
* otherwise.
*/
public boolean performContextClick(float x, float y) {
return performContextClick();
}
/**
* Call this view's OnContextClickListener, if it is defined.
*
* @return True if there was an assigned OnContextClickListener that consumed the event, false
* otherwise.
*/
public boolean performContextClick() {
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CONTEXT_CLICKED);
boolean handled = false;
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnContextClickListener != null) {
handled = li.mOnContextClickListener.onContextClick(View.this);
}
if (handled) {
performHapticFeedback(HapticFeedbackConstants.CONTEXT_CLICK);
}
return handled;
}
/**
* Performs button-related actions during a touch down event.
*
* @param event The event.
* @return True if the down was consumed.
*
* @hide
*/
protected boolean performButtonActionOnTouchDown(MotionEvent event) {
if (event.isFromSource(InputDevice.SOURCE_MOUSE) &&
(event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) {
showContextMenu(event.getX(), event.getY());
mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT;
return true;
}
return false;
}
/**
* Shows the context menu for this view.
*
* @return {@code true} if the context menu was shown, {@code false}
* otherwise
* @see #showContextMenu(float, float)
*/
public boolean showContextMenu() {
return getParent().showContextMenuForChild(this);
}
/**
* Shows the context menu for this view anchored to the specified
* view-relative coordinate.
*
* @param x the X coordinate in pixels relative to the view to which the
* menu should be anchored, or {@link Float#NaN} to disable anchoring
* @param y the Y coordinate in pixels relative to the view to which the
* menu should be anchored, or {@link Float#NaN} to disable anchoring
* @return {@code true} if the context menu was shown, {@code false}
* otherwise
*/
public boolean showContextMenu(float x, float y) {
return getParent().showContextMenuForChild(this, x, y);
}
/**
* Start an action mode with the default type {@link ActionMode#TYPE_PRIMARY}.
*
* @param callback Callback that will control the lifecycle of the action mode
* @return The new action mode if it is started, null otherwise
*
* @see ActionMode
* @see #startActionMode(android.view.ActionMode.Callback, int)
*/
public ActionMode startActionMode(ActionMode.Callback callback) {
return startActionMode(callback, ActionMode.TYPE_PRIMARY);
}
/**
* Start an action mode with the given type.
*
* @param callback Callback that will control the lifecycle of the action mode
* @param type One of {@link ActionMode#TYPE_PRIMARY} or {@link ActionMode#TYPE_FLOATING}.
* @return The new action mode if it is started, null otherwise
*
* @see ActionMode
*/
public ActionMode startActionMode(ActionMode.Callback callback, int type) {
ViewParent parent = getParent();
if (parent == null) return null;
try {
return parent.startActionModeForChild(this, callback, type);
} catch (AbstractMethodError ame) {
// Older implementations of custom views might not implement this.
return parent.startActionModeForChild(this, callback);
}
}
/**
* Call {@link Context#startActivityForResult(String, Intent, int, Bundle)} for the View's
* Context, creating a unique View identifier to retrieve the result.
*
* @param intent The Intent to be started.
* @param requestCode The request code to use.
* @hide
*/
public void startActivityForResult(Intent intent, int requestCode) {
mStartActivityRequestWho = "@android:view:" + System.identityHashCode(this);
getContext().startActivityForResult(mStartActivityRequestWho, intent, requestCode, null);
}
/**
* If this View corresponds to the calling who, dispatches the activity result.
* @param who The identifier for the targeted View to receive the result.
* @param requestCode The integer request code originally supplied to
* startActivityForResult(), allowing you to identify who this
* result came from.
* @param resultCode The integer result code returned by the child activity
* through its setResult().
* @param data An Intent, which can return result data to the caller
* (various data can be attached to Intent "extras").
* @return {@code true} if the activity result was dispatched.
* @hide
*/
public boolean dispatchActivityResult(
String who, int requestCode, int resultCode, Intent data) {
if (mStartActivityRequestWho != null && mStartActivityRequestWho.equals(who)) {
onActivityResult(requestCode, resultCode, data);
mStartActivityRequestWho = null;
return true;
}
return false;
}
/**
* Receive the result from a previous call to {@link #startActivityForResult(Intent, int)}.
*
* @param requestCode The integer request code originally supplied to
* startActivityForResult(), allowing you to identify who this
* result came from.
* @param resultCode The integer result code returned by the child activity
* through its setResult().
* @param data An Intent, which can return result data to the caller
* (various data can be attached to Intent "extras").
* @hide
*/
public void onActivityResult(int requestCode, int resultCode, Intent data) {
// Do nothing.
}
/**
* Register a callback to be invoked when a hardware key is pressed in this view.
* Key presses in software input methods will generally not trigger the methods of
* this listener.
* @param l the key listener to attach to this view
*/
public void setOnKeyListener(OnKeyListener l) {
getListenerInfo().mOnKeyListener = l;
}
/**
* Register a callback to be invoked when a touch event is sent to this view.
* @param l the touch listener to attach to this view
*/
public void setOnTouchListener(OnTouchListener l) {
getListenerInfo().mOnTouchListener = l;
}
/**
* Register a callback to be invoked when a generic motion event is sent to this view.
* @param l the generic motion listener to attach to this view
*/
public void setOnGenericMotionListener(OnGenericMotionListener l) {
getListenerInfo().mOnGenericMotionListener = l;
}
/**
* Register a callback to be invoked when a hover event is sent to this view.
* @param l the hover listener to attach to this view
*/
public void setOnHoverListener(OnHoverListener l) {
getListenerInfo().mOnHoverListener = l;
}
/**
* Register a drag event listener callback object for this View. The parameter is
* an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a
* View, the system calls the
* {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method.
* @param l An implementation of {@link android.view.View.OnDragListener}.
*/
public void setOnDragListener(OnDragListener l) {
getListenerInfo().mOnDragListener = l;
}
/**
* Give this view focus. This will cause
* {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called.
*
* Note: this does not check whether this {@link View} should get focus, it just
* gives it focus no matter what. It should only be called internally by framework
* code that knows what it is doing, namely {@link #requestFocus(int, Rect)}.
*
* @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN},
* {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which
* focus moved when requestFocus() is called. It may not always
* apply, in which case use the default View.FOCUS_DOWN.
* @param previouslyFocusedRect The rectangle of the view that had focus
* prior in this View's coordinate system.
*/
void handleFocusGainInternal(@FocusRealDirection int direction, Rect previouslyFocusedRect) {
if (DBG) {
System.out.println(this + " requestFocus()");
}
if ((mPrivateFlags & PFLAG_FOCUSED) == 0) {
mPrivateFlags |= PFLAG_FOCUSED;
View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null;
if (mParent != null) {
mParent.requestChildFocus(this, this);
}
if (mAttachInfo != null) {
mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this);
}
onFocusChanged(true, direction, previouslyFocusedRect);
refreshDrawableState();
}
}
/**
* Sets this view's preference for reveal behavior when it gains focus.
*
* <p>When set to true, this is a signal to ancestor views in the hierarchy that
* this view would prefer to be brought fully into view when it gains focus.
* For example, a text field that a user is meant to type into. Other views such
* as scrolling containers may prefer to opt-out of this behavior.</p>
*
* <p>The default value for views is true, though subclasses may change this
* based on their preferred behavior.</p>
*
* @param revealOnFocus true to request reveal on focus in ancestors, false otherwise
*
* @see #getRevealOnFocusHint()
*/
public final void setRevealOnFocusHint(boolean revealOnFocus) {
if (revealOnFocus) {
mPrivateFlags3 &= ~PFLAG3_NO_REVEAL_ON_FOCUS;
} else {
mPrivateFlags3 |= PFLAG3_NO_REVEAL_ON_FOCUS;
}
}
/**
* Returns this view's preference for reveal behavior when it gains focus.
*
* <p>When this method returns true for a child view requesting focus, ancestor
* views responding to a focus change in {@link ViewParent#requestChildFocus(View, View)}
* should make a best effort to make the newly focused child fully visible to the user.
* When it returns false, ancestor views should preferably not disrupt scroll positioning or
* other properties affecting visibility to the user as part of the focus change.</p>
*
* @return true if this view would prefer to become fully visible when it gains focus,
* false if it would prefer not to disrupt scroll positioning
*
* @see #setRevealOnFocusHint(boolean)
*/
public final boolean getRevealOnFocusHint() {
return (mPrivateFlags3 & PFLAG3_NO_REVEAL_ON_FOCUS) == 0;
}
/**
* Populates <code>outRect</code> with the hotspot bounds. By default,
* the hotspot bounds are identical to the screen bounds.
*
* @param outRect rect to populate with hotspot bounds
* @hide Only for internal use by views and widgets.
*/
public void getHotspotBounds(Rect outRect) {
final Drawable background = getBackground();
if (background != null) {
background.getHotspotBounds(outRect);
} else {
getBoundsOnScreen(outRect);
}
}
/**
* Request that a rectangle of this view be visible on the screen,
* scrolling if necessary just enough.
*
* <p>A View should call this if it maintains some notion of which part
* of its content is interesting. For example, a text editing view
* should call this when its cursor moves.
* <p>The Rectangle passed into this method should be in the View's content coordinate space.
* It should not be affected by which part of the View is currently visible or its scroll
* position.
*
* @param rectangle The rectangle in the View's content coordinate space
* @return Whether any parent scrolled.
*/
public boolean requestRectangleOnScreen(Rect rectangle) {
return requestRectangleOnScreen(rectangle, false);
}
/**
* Request that a rectangle of this view be visible on the screen,
* scrolling if necessary just enough.
*
* <p>A View should call this if it maintains some notion of which part
* of its content is interesting. For example, a text editing view
* should call this when its cursor moves.
* <p>The Rectangle passed into this method should be in the View's content coordinate space.
* It should not be affected by which part of the View is currently visible or its scroll
* position.
* <p>When <code>immediate</code> is set to true, scrolling will not be
* animated.
*
* @param rectangle The rectangle in the View's content coordinate space
* @param immediate True to forbid animated scrolling, false otherwise
* @return Whether any parent scrolled.
*/
public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) {
if (mParent == null) {
return false;
}
View child = this;
RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF();
position.set(rectangle);
ViewParent parent = mParent;
boolean scrolled = false;
while (parent != null) {
rectangle.set((int) position.left, (int) position.top,
(int) position.right, (int) position.bottom);
scrolled |= parent.requestChildRectangleOnScreen(child, rectangle, immediate);
if (!(parent instanceof View)) {
break;
}
// move it from child's content coordinate space to parent's content coordinate space
position.offset(child.mLeft - child.getScrollX(), child.mTop -child.getScrollY());
child = (View) parent;
parent = child.getParent();
}
return scrolled;
}
/**
* Called when this view wants to give up focus. If focus is cleared
* {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called.
* <p>
* <strong>Note:</strong> When a View clears focus the framework is trying
* to give focus to the first focusable View from the top. Hence, if this
* View is the first from the top that can take focus, then all callbacks
* related to clearing focus will be invoked after which the framework will
* give focus to this view.
* </p>
*/
public void clearFocus() {
if (DBG) {
System.out.println(this + " clearFocus()");
}
clearFocusInternal(null, true, true);
}
/**
* Clears focus from the view, optionally propagating the change up through
* the parent hierarchy and requesting that the root view place new focus.
*
* @param propagate whether to propagate the change up through the parent
* hierarchy
* @param refocus when propagate is true, specifies whether to request the
* root view place new focus
*/
void clearFocusInternal(View focused, boolean propagate, boolean refocus) {
if ((mPrivateFlags & PFLAG_FOCUSED) != 0) {
mPrivateFlags &= ~PFLAG_FOCUSED;
if (propagate && mParent != null) {
mParent.clearChildFocus(this);
}
onFocusChanged(false, 0, null);
refreshDrawableState();
if (propagate && (!refocus || !rootViewRequestFocus())) {
notifyGlobalFocusCleared(this);
}
}
}
void notifyGlobalFocusCleared(View oldFocus) {
if (oldFocus != null && mAttachInfo != null) {
mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null);
}
}
boolean rootViewRequestFocus() {
final View root = getRootView();
return root != null && root.requestFocus();
}
/**
* Called internally by the view system when a new view is getting focus.
* This is what clears the old focus.
* <p>
* <b>NOTE:</b> The parent view's focused child must be updated manually
* after calling this method. Otherwise, the view hierarchy may be left in
* an inconstent state.
*/
void unFocus(View focused) {
if (DBG) {
System.out.println(this + " unFocus()");
}
clearFocusInternal(focused, false, false);
}
/**
* Returns true if this view has focus itself, or is the ancestor of the
* view that has focus.
*
* @return True if this view has or contains focus, false otherwise.
*/
@ViewDebug.ExportedProperty(category = "focus")
public boolean hasFocus() {
return (mPrivateFlags & PFLAG_FOCUSED) != 0;
}
/**
* Returns true if this view is focusable or if it contains a reachable View
* for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()"
* is a View whose parents do not block descendants focus.
*
* Only {@link #VISIBLE} views are considered focusable.
*
* @return True if the view is focusable or if the view contains a focusable
* View, false otherwise.
*
* @see ViewGroup#FOCUS_BLOCK_DESCENDANTS
* @see ViewGroup#getTouchscreenBlocksFocus()
*/
public boolean hasFocusable() {
if (!isFocusableInTouchMode()) {
for (ViewParent p = mParent; p instanceof ViewGroup; p = p.getParent()) {
final ViewGroup g = (ViewGroup) p;
if (g.shouldBlockFocusForTouchscreen()) {
return false;
}
}
}
return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable();
}
/**
* Called by the view system when the focus state of this view changes.
* When the focus change event is caused by directional navigation, direction
* and previouslyFocusedRect provide insight into where the focus is coming from.
* When overriding, be sure to call up through to the super class so that
* the standard focus handling will occur.
*
* @param gainFocus True if the View has focus; false otherwise.
* @param direction The direction focus has moved when requestFocus()
* is called to give this view focus. Values are
* {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT},
* {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}.
* It may not always apply, in which case use the default.
* @param previouslyFocusedRect The rectangle, in this view's coordinate
* system, of the previously focused view. If applicable, this will be
* passed in as finer grained information about where the focus is coming
* from (in addition to direction). Will be <code>null</code> otherwise.
*/
@CallSuper
protected void onFocusChanged(boolean gainFocus, @FocusDirection int direction,
@Nullable Rect previouslyFocusedRect) {
if (gainFocus) {
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
} else {
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
InputMethodManager imm = InputMethodManager.peekInstance();
if (!gainFocus) {
if (isPressed()) {
setPressed(false);
}
if (imm != null && mAttachInfo != null
&& mAttachInfo.mHasWindowFocus) {
imm.focusOut(this);
}
onFocusLost();
} else if (imm != null && mAttachInfo != null
&& mAttachInfo.mHasWindowFocus) {
imm.focusIn(this);
}
invalidate(true);
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnFocusChangeListener != null) {
li.mOnFocusChangeListener.onFocusChange(this, gainFocus);
}
if (mAttachInfo != null) {
mAttachInfo.mKeyDispatchState.reset(this);
}
}
/**
* Sends an accessibility event of the given type. If accessibility is
* not enabled this method has no effect. The default implementation calls
* {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first
* to populate information about the event source (this View), then calls
* {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to
* populate the text content of the event source including its descendants,
* and last calls
* {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)}
* on its parent to request sending of the event to interested parties.
* <p>
* If an {@link AccessibilityDelegate} has been specified via calling
* {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
* {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is
* responsible for handling this call.
* </p>
*
* @param eventType The type of the event to send, as defined by several types from
* {@link android.view.accessibility.AccessibilityEvent}, such as
* {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or
* {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}.
*
* @see #onInitializeAccessibilityEvent(AccessibilityEvent)
* @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
* @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)
* @see AccessibilityDelegate
*/
public void sendAccessibilityEvent(int eventType) {
if (mAccessibilityDelegate != null) {
mAccessibilityDelegate.sendAccessibilityEvent(this, eventType);
} else {
sendAccessibilityEventInternal(eventType);
}
}
/**
* Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT}
* {@link AccessibilityEvent} to make an announcement which is related to some
* sort of a context change for which none of the events representing UI transitions
* is a good fit. For example, announcing a new page in a book. If accessibility
* is not enabled this method does nothing.
*
* @param text The announcement text.
*/
public void announceForAccessibility(CharSequence text) {
if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) {
AccessibilityEvent event = AccessibilityEvent.obtain(
AccessibilityEvent.TYPE_ANNOUNCEMENT);
onInitializeAccessibilityEvent(event);
event.getText().add(text);
event.setContentDescription(null);
mParent.requestSendAccessibilityEvent(this, event);
}
}
/**
* @see #sendAccessibilityEvent(int)
*
* Note: Called from the default {@link AccessibilityDelegate}.
*
* @hide
*/
public void sendAccessibilityEventInternal(int eventType) {
if (AccessibilityManager.getInstance(mContext).isEnabled()) {
sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType));
}
}
/**
* This method behaves exactly as {@link #sendAccessibilityEvent(int)} but
* takes as an argument an empty {@link AccessibilityEvent} and does not
* perform a check whether accessibility is enabled.
* <p>
* If an {@link AccessibilityDelegate} has been specified via calling
* {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
* {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)}
* is responsible for handling this call.
* </p>
*
* @param event The event to send.
*
* @see #sendAccessibilityEvent(int)
*/
public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {
if (mAccessibilityDelegate != null) {
mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event);
} else {
sendAccessibilityEventUncheckedInternal(event);
}
}
/**
* @see #sendAccessibilityEventUnchecked(AccessibilityEvent)
*
* Note: Called from the default {@link AccessibilityDelegate}.
*
* @hide
*/
public void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) {
if (!isShown()) {
return;
}
onInitializeAccessibilityEvent(event);
// Only a subset of accessibility events populates text content.
if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) {
dispatchPopulateAccessibilityEvent(event);
}
// In the beginning we called #isShown(), so we know that getParent() is not null.
getParent().requestSendAccessibilityEvent(this, event);
}
/**
* Dispatches an {@link AccessibilityEvent} to the {@link View} first and then
* to its children for adding their text content to the event. Note that the
* event text is populated in a separate dispatch path since we add to the
* event not only the text of the source but also the text of all its descendants.
* A typical implementation will call
* {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view
* and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)}
* on each child. Override this method if custom population of the event text
* content is required.
* <p>
* If an {@link AccessibilityDelegate} has been specified via calling
* {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
* {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)}
* is responsible for handling this call.
* </p>
* <p>
* <em>Note:</em> Accessibility events of certain types are not dispatched for
* populating the event text via this method. For details refer to {@link AccessibilityEvent}.
* </p>
*
* @param event The event.
*
* @return True if the event population was completed.
*/
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
if (mAccessibilityDelegate != null) {
return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event);
} else {
return dispatchPopulateAccessibilityEventInternal(event);
}
}
/**
* @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
*
* Note: Called from the default {@link AccessibilityDelegate}.
*
* @hide
*/
public boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) {
onPopulateAccessibilityEvent(event);
return false;
}
/**
* Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)}
* giving a chance to this View to populate the accessibility event with its
* text content. While this method is free to modify event
* attributes other than text content, doing so should normally be performed in
* {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}.
* <p>
* Example: Adding formatted date string to an accessibility event in addition
* to the text added by the super implementation:
* <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
* super.onPopulateAccessibilityEvent(event);
* final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY;
* String selectedDateUtterance = DateUtils.formatDateTime(mContext,
* mCurrentDate.getTimeInMillis(), flags);
* event.getText().add(selectedDateUtterance);
* }</pre>
* <p>
* If an {@link AccessibilityDelegate} has been specified via calling
* {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
* {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)}
* is responsible for handling this call.
* </p>
* <p class="note"><strong>Note:</strong> Always call the super implementation before adding
* information to the event, in case the default implementation has basic information to add.
* </p>
*
* @param event The accessibility event which to populate.
*
* @see #sendAccessibilityEvent(int)
* @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
*/
@CallSuper
public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
if (mAccessibilityDelegate != null) {
mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event);
} else {
onPopulateAccessibilityEventInternal(event);
}
}
/**
* @see #onPopulateAccessibilityEvent(AccessibilityEvent)
*
* Note: Called from the default {@link AccessibilityDelegate}.
*
* @hide
*/
public void onPopulateAccessibilityEventInternal(AccessibilityEvent event) {
}
/**
* Initializes an {@link AccessibilityEvent} with information about
* this View which is the event source. In other words, the source of
* an accessibility event is the view whose state change triggered firing
* the event.
* <p>
* Example: Setting the password property of an event in addition
* to properties set by the super implementation:
* <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
* super.onInitializeAccessibilityEvent(event);
* event.setPassword(true);
* }</pre>
* <p>
* If an {@link AccessibilityDelegate} has been specified via calling
* {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
* {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)}
* is responsible for handling this call.
* </p>
* <p class="note"><strong>Note:</strong> Always call the super implementation before adding
* information to the event, in case the default implementation has basic information to add.
* </p>
* @param event The event to initialize.
*
* @see #sendAccessibilityEvent(int)
* @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent)
*/
@CallSuper
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
if (mAccessibilityDelegate != null) {
mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event);
} else {
onInitializeAccessibilityEventInternal(event);
}
}
/**
* @see #onInitializeAccessibilityEvent(AccessibilityEvent)
*
* Note: Called from the default {@link AccessibilityDelegate}.
*
* @hide
*/
public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
event.setSource(this);
event.setClassName(getAccessibilityClassName());
event.setPackageName(getContext().getPackageName());
event.setEnabled(isEnabled());
event.setContentDescription(mContentDescription);
switch (event.getEventType()) {
case AccessibilityEvent.TYPE_VIEW_FOCUSED: {
ArrayList<View> focusablesTempList = (mAttachInfo != null)
? mAttachInfo.mTempArrayList : new ArrayList<View>();
getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL);
event.setItemCount(focusablesTempList.size());
event.setCurrentItemIndex(focusablesTempList.indexOf(this));
if (mAttachInfo != null) {
focusablesTempList.clear();
}
} break;
case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: {
CharSequence text = getIterableTextForAccessibility();
if (text != null && text.length() > 0) {
event.setFromIndex(getAccessibilitySelectionStart());
event.setToIndex(getAccessibilitySelectionEnd());
event.setItemCount(text.length());
}
} break;
}
}
/**
* Returns an {@link AccessibilityNodeInfo} representing this view from the
* point of view of an {@link android.accessibilityservice.AccessibilityService}.
* This method is responsible for obtaining an accessibility node info from a
* pool of reusable instances and calling
* {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to
* initialize the former.
* <p>
* Note: The client is responsible for recycling the obtained instance by calling
* {@link AccessibilityNodeInfo#recycle()} to minimize object creation.
* </p>
*
* @return A populated {@link AccessibilityNodeInfo}.
*
* @see AccessibilityNodeInfo
*/
public AccessibilityNodeInfo createAccessibilityNodeInfo() {
if (mAccessibilityDelegate != null) {
return mAccessibilityDelegate.createAccessibilityNodeInfo(this);
} else {
return createAccessibilityNodeInfoInternal();
}
}
/**
* @see #createAccessibilityNodeInfo()
*
* @hide
*/
public AccessibilityNodeInfo createAccessibilityNodeInfoInternal() {
AccessibilityNodeProvider provider = getAccessibilityNodeProvider();
if (provider != null) {
return provider.createAccessibilityNodeInfo(AccessibilityNodeProvider.HOST_VIEW_ID);
} else {
AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this);
onInitializeAccessibilityNodeInfo(info);
return info;
}
}
/**
* Initializes an {@link AccessibilityNodeInfo} with information about this view.
* The base implementation sets:
* <ul>
* <li>{@link AccessibilityNodeInfo#setParent(View)},</li>
* <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li>
* <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li>
* <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li>
* <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li>
* <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li>
* <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li>
* <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li>
* <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li>
* <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li>
* <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li>
* <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li>
* <li>{@link AccessibilityNodeInfo#setContextClickable(boolean)}</li>
* </ul>
* <p>
* Subclasses should override this method, call the super implementation,
* and set additional attributes.
* </p>
* <p>
* If an {@link AccessibilityDelegate} has been specified via calling
* {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
* {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)}
* is responsible for handling this call.
* </p>
*
* @param info The instance to initialize.
*/
@CallSuper
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
if (mAccessibilityDelegate != null) {
mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info);
} else {
onInitializeAccessibilityNodeInfoInternal(info);
}
}
/**
* Gets the location of this view in screen coordinates.
*
* @param outRect The output location
* @hide
*/
public void getBoundsOnScreen(Rect outRect) {
getBoundsOnScreen(outRect, false);
}
/**
* Gets the location of this view in screen coordinates.
*
* @param outRect The output location
* @param clipToParent Whether to clip child bounds to the parent ones.
* @hide
*/
public void getBoundsOnScreen(Rect outRect, boolean clipToParent) {
if (mAttachInfo == null) {
return;
}
RectF position = mAttachInfo.mTmpTransformRect;
position.set(0, 0, mRight - mLeft, mBottom - mTop);
if (!hasIdentityMatrix()) {
getMatrix().mapRect(position);
}
position.offset(mLeft, mTop);
ViewParent parent = mParent;
while (parent instanceof View) {
View parentView = (View) parent;
position.offset(-parentView.mScrollX, -parentView.mScrollY);
if (clipToParent) {
position.left = Math.max(position.left, 0);
position.top = Math.max(position.top, 0);
position.right = Math.min(position.right, parentView.getWidth());
position.bottom = Math.min(position.bottom, parentView.getHeight());
}
if (!parentView.hasIdentityMatrix()) {
parentView.getMatrix().mapRect(position);
}
position.offset(parentView.mLeft, parentView.mTop);
parent = parentView.mParent;
}
if (parent instanceof ViewRootImpl) {
ViewRootImpl viewRootImpl = (ViewRootImpl) parent;
position.offset(0, -viewRootImpl.mCurScrollY);
}
position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop);
outRect.set(Math.round(position.left), Math.round(position.top),
Math.round(position.right), Math.round(position.bottom));
}
/**
* Return the class name of this object to be used for accessibility purposes.
* Subclasses should only override this if they are implementing something that
* should be seen as a completely new class of view when used by accessibility,
* unrelated to the class it is deriving from. This is used to fill in
* {@link AccessibilityNodeInfo#setClassName AccessibilityNodeInfo.setClassName}.
*/
public CharSequence getAccessibilityClassName() {
return View.class.getName();
}
/**
* Called when assist structure is being retrieved from a view as part of
* {@link android.app.Activity#onProvideAssistData Activity.onProvideAssistData}.
* @param structure Fill in with structured view data. The default implementation
* fills in all data that can be inferred from the view itself.
*/
public void onProvideStructure(ViewStructure structure) {
final int id = mID;
if (id > 0 && (id&0xff000000) != 0 && (id&0x00ff0000) != 0
&& (id&0x0000ffff) != 0) {
String pkg, type, entry;
try {
final Resources res = getResources();
entry = res.getResourceEntryName(id);
type = res.getResourceTypeName(id);
pkg = res.getResourcePackageName(id);
} catch (Resources.NotFoundException e) {
entry = type = pkg = null;
}
structure.setId(id, pkg, type, entry);
} else {
structure.setId(id, null, null, null);
}
structure.setDimens(mLeft, mTop, mScrollX, mScrollY, mRight - mLeft, mBottom - mTop);
if (!hasIdentityMatrix()) {
structure.setTransformation(getMatrix());
}
structure.setElevation(getZ());
structure.setVisibility(getVisibility());
structure.setEnabled(isEnabled());
if (isClickable()) {
structure.setClickable(true);
}
if (isFocusable()) {
structure.setFocusable(true);
}
if (isFocused()) {
structure.setFocused(true);
}
if (isAccessibilityFocused()) {
structure.setAccessibilityFocused(true);
}
if (isSelected()) {
structure.setSelected(true);
}
if (isActivated()) {
structure.setActivated(true);
}
if (isLongClickable()) {
structure.setLongClickable(true);
}
if (this instanceof Checkable) {
structure.setCheckable(true);
if (((Checkable)this).isChecked()) {
structure.setChecked(true);
}
}
if (isContextClickable()) {
structure.setContextClickable(true);
}
structure.setClassName(getAccessibilityClassName().toString());
structure.setContentDescription(getContentDescription());
}
/**
* Called when assist structure is being retrieved from a view as part of
* {@link android.app.Activity#onProvideAssistData Activity.onProvideAssistData} to
* generate additional virtual structure under this view. The defaullt implementation
* uses {@link #getAccessibilityNodeProvider()} to try to generate this from the
* view's virtual accessibility nodes, if any. You can override this for a more
* optimal implementation providing this data.
*/
public void onProvideVirtualStructure(ViewStructure structure) {
AccessibilityNodeProvider provider = getAccessibilityNodeProvider();
if (provider != null) {
AccessibilityNodeInfo info = createAccessibilityNodeInfo();
structure.setChildCount(1);
ViewStructure root = structure.newChild(0);
populateVirtualStructure(root, provider, info);
info.recycle();
}
}
private void populateVirtualStructure(ViewStructure structure,
AccessibilityNodeProvider provider, AccessibilityNodeInfo info) {
structure.setId(AccessibilityNodeInfo.getVirtualDescendantId(info.getSourceNodeId()),
null, null, null);
Rect rect = structure.getTempRect();
info.getBoundsInParent(rect);
structure.setDimens(rect.left, rect.top, 0, 0, rect.width(), rect.height());
structure.setVisibility(VISIBLE);
structure.setEnabled(info.isEnabled());
if (info.isClickable()) {
structure.setClickable(true);
}
if (info.isFocusable()) {
structure.setFocusable(true);
}
if (info.isFocused()) {
structure.setFocused(true);
}
if (info.isAccessibilityFocused()) {
structure.setAccessibilityFocused(true);
}
if (info.isSelected()) {
structure.setSelected(true);
}
if (info.isLongClickable()) {
structure.setLongClickable(true);
}
if (info.isCheckable()) {
structure.setCheckable(true);
if (info.isChecked()) {
structure.setChecked(true);
}
}
if (info.isContextClickable()) {
structure.setContextClickable(true);
}
CharSequence cname = info.getClassName();
structure.setClassName(cname != null ? cname.toString() : null);
structure.setContentDescription(info.getContentDescription());
if (info.getText() != null || info.getError() != null) {
structure.setText(info.getText(), info.getTextSelectionStart(),
info.getTextSelectionEnd());
}
final int NCHILDREN = info.getChildCount();
if (NCHILDREN > 0) {
structure.setChildCount(NCHILDREN);
for (int i=0; i<NCHILDREN; i++) {
AccessibilityNodeInfo cinfo = provider.createAccessibilityNodeInfo(
AccessibilityNodeInfo.getVirtualDescendantId(info.getChildId(i)));
ViewStructure child = structure.newChild(i);
populateVirtualStructure(child, provider, cinfo);
cinfo.recycle();
}
}
}
/**
* Dispatch creation of {@link ViewStructure} down the hierarchy. The default
* implementation calls {@link #onProvideStructure} and
* {@link #onProvideVirtualStructure}.
*/
public void dispatchProvideStructure(ViewStructure structure) {
if (!isAssistBlocked()) {
onProvideStructure(structure);
onProvideVirtualStructure(structure);
} else {
structure.setClassName(getAccessibilityClassName().toString());
structure.setAssistBlocked(true);
}
}
/**
* @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
*
* Note: Called from the default {@link AccessibilityDelegate}.
*
* @hide
*/
public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
if (mAttachInfo == null) {
return;
}
Rect bounds = mAttachInfo.mTmpInvalRect;
getDrawingRect(bounds);
info.setBoundsInParent(bounds);
getBoundsOnScreen(bounds, true);
info.setBoundsInScreen(bounds);
ViewParent parent = getParentForAccessibility();
if (parent instanceof View) {
info.setParent((View) parent);
}
if (mID != View.NO_ID) {
View rootView = getRootView();
if (rootView == null) {
rootView = this;
}
View label = rootView.findLabelForView(this, mID);
if (label != null) {
info.setLabeledBy(label);
}
if ((mAttachInfo.mAccessibilityFetchFlags
& AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0
&& Resources.resourceHasPackage(mID)) {
try {
String viewId = getResources().getResourceName(mID);
info.setViewIdResourceName(viewId);
} catch (Resources.NotFoundException nfe) {
/* ignore */
}
}
}
if (mLabelForId != View.NO_ID) {
View rootView = getRootView();
if (rootView == null) {
rootView = this;
}
View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId);
if (labeled != null) {
info.setLabelFor(labeled);
}
}
if (mAccessibilityTraversalBeforeId != View.NO_ID) {
View rootView = getRootView();
if (rootView == null) {
rootView = this;
}
View next = rootView.findViewInsideOutShouldExist(this,
mAccessibilityTraversalBeforeId);
if (next != null && next.includeForAccessibility()) {
info.setTraversalBefore(next);
}
}
if (mAccessibilityTraversalAfterId != View.NO_ID) {
View rootView = getRootView();
if (rootView == null) {
rootView = this;
}
View next = rootView.findViewInsideOutShouldExist(this,
mAccessibilityTraversalAfterId);
if (next != null && next.includeForAccessibility()) {
info.setTraversalAfter(next);
}
}
info.setVisibleToUser(isVisibleToUser());
if ((mAttachInfo != null) && ((mAttachInfo.mAccessibilityFetchFlags
& AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0)) {
info.setImportantForAccessibility(isImportantForAccessibility());
} else {
info.setImportantForAccessibility(true);
}
info.setPackageName(mContext.getPackageName());
info.setClassName(getAccessibilityClassName());
info.setContentDescription(getContentDescription());
info.setEnabled(isEnabled());
info.setClickable(isClickable());
info.setFocusable(isFocusable());
info.setFocused(isFocused());
info.setAccessibilityFocused(isAccessibilityFocused());
info.setSelected(isSelected());
info.setLongClickable(isLongClickable());
info.setContextClickable(isContextClickable());
info.setLiveRegion(getAccessibilityLiveRegion());
// TODO: These make sense only if we are in an AdapterView but all
// views can be selected. Maybe from accessibility perspective
// we should report as selectable view in an AdapterView.
info.addAction(AccessibilityNodeInfo.ACTION_SELECT);
info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION);
if (isFocusable()) {
if (isFocused()) {
info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS);
} else {
info.addAction(AccessibilityNodeInfo.ACTION_FOCUS);
}
}
if (!isAccessibilityFocused()) {
info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
} else {
info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
}
if (isClickable() && isEnabled()) {
info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
}
if (isLongClickable() && isEnabled()) {
info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK);
}
if (isContextClickable() && isEnabled()) {
info.addAction(AccessibilityAction.ACTION_CONTEXT_CLICK);
}
CharSequence text = getIterableTextForAccessibility();
if (text != null && text.length() > 0) {
info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd());
info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION);
info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY);
info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY);
info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER
| AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD
| AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH);
}
info.addAction(AccessibilityAction.ACTION_SHOW_ON_SCREEN);
populateAccessibilityNodeInfoDrawingOrderInParent(info);
}
/**
* Determine the order in which this view will be drawn relative to its siblings for a11y
*
* @param info The info whose drawing order should be populated
*/
private void populateAccessibilityNodeInfoDrawingOrderInParent(AccessibilityNodeInfo info) {
/*
* If the view's bounds haven't been set yet, layout has not completed. In that situation,
* drawing order may not be well-defined, and some Views with custom drawing order may
* not be initialized sufficiently to respond properly getChildDrawingOrder.
*/
if ((mPrivateFlags & PFLAG_HAS_BOUNDS) == 0) {
info.setDrawingOrder(0);
return;
}
int drawingOrderInParent = 1;
// Iterate up the hierarchy if parents are not important for a11y
View viewAtDrawingLevel = this;
final ViewParent parent = getParentForAccessibility();
while (viewAtDrawingLevel != parent) {
final ViewParent currentParent = viewAtDrawingLevel.getParent();
if (!(currentParent instanceof ViewGroup)) {
// Should only happen for the Decor
drawingOrderInParent = 0;
break;
} else {
final ViewGroup parentGroup = (ViewGroup) currentParent;
final int childCount = parentGroup.getChildCount();
if (childCount > 1) {
List<View> preorderedList = parentGroup.buildOrderedChildList();
if (preorderedList != null) {
final int childDrawIndex = preorderedList.indexOf(viewAtDrawingLevel);
for (int i = 0; i < childDrawIndex; i++) {
drawingOrderInParent += numViewsForAccessibility(preorderedList.get(i));
}
} else {
final int childIndex = parentGroup.indexOfChild(viewAtDrawingLevel);
final boolean customOrder = parentGroup.isChildrenDrawingOrderEnabled();
final int childDrawIndex = ((childIndex >= 0) && customOrder) ? parentGroup
.getChildDrawingOrder(childCount, childIndex) : childIndex;
final int numChildrenToIterate = customOrder ? childCount : childDrawIndex;
if (childDrawIndex != 0) {
for (int i = 0; i < numChildrenToIterate; i++) {
final int otherDrawIndex = (customOrder ?
parentGroup.getChildDrawingOrder(childCount, i) : i);
if (otherDrawIndex < childDrawIndex) {
drawingOrderInParent +=
numViewsForAccessibility(parentGroup.getChildAt(i));
}
}
}
}
}
}
viewAtDrawingLevel = (View) currentParent;
}
info.setDrawingOrder(drawingOrderInParent);
}
private static int numViewsForAccessibility(View view) {
if (view != null) {
if (view.includeForAccessibility()) {
return 1;
} else if (view instanceof ViewGroup) {
return ((ViewGroup) view).getNumChildrenForAccessibility();
}
}
return 0;
}
private View findLabelForView(View view, int labeledId) {
if (mMatchLabelForPredicate == null) {
mMatchLabelForPredicate = new MatchLabelForPredicate();
}
mMatchLabelForPredicate.mLabeledId = labeledId;
return findViewByPredicateInsideOut(view, mMatchLabelForPredicate);
}
/**
* Computes whether this view is visible to the user. Such a view is
* attached, visible, all its predecessors are visible, it is not clipped
* entirely by its predecessors, and has an alpha greater than zero.
*
* @return Whether the view is visible on the screen.
*
* @hide
*/
protected boolean isVisibleToUser() {
return isVisibleToUser(null);
}
/**
* Computes whether the given portion of this view is visible to the user.
* Such a view is attached, visible, all its predecessors are visible,
* has an alpha greater than zero, and the specified portion is not
* clipped entirely by its predecessors.
*
* @param boundInView the portion of the view to test; coordinates should be relative; may be
* <code>null</code>, and the entire view will be tested in this case.
* When <code>true</code> is returned by the function, the actual visible
* region will be stored in this parameter; that is, if boundInView is fully
* contained within the view, no modification will be made, otherwise regions
* outside of the visible area of the view will be clipped.
*
* @return Whether the specified portion of the view is visible on the screen.
*
* @hide
*/
protected boolean isVisibleToUser(Rect boundInView) {
if (mAttachInfo != null) {
// Attached to invisible window means this view is not visible.
if (mAttachInfo.mWindowVisibility != View.VISIBLE) {
return false;
}
// An invisible predecessor or one with alpha zero means
// that this view is not visible to the user.
Object current = this;
while (current instanceof View) {
View view = (View) current;
// We have attach info so this view is attached and there is no
// need to check whether we reach to ViewRootImpl on the way up.
if (view.getAlpha() <= 0 || view.getTransitionAlpha() <= 0 ||
view.getVisibility() != VISIBLE) {
return false;
}
current = view.mParent;
}
// Check if the view is entirely covered by its predecessors.
Rect visibleRect = mAttachInfo.mTmpInvalRect;
Point offset = mAttachInfo.mPoint;
if (!getGlobalVisibleRect(visibleRect, offset)) {
return false;
}
// Check if the visible portion intersects the rectangle of interest.
if (boundInView != null) {
visibleRect.offset(-offset.x, -offset.y);
return boundInView.intersect(visibleRect);
}
return true;
}
return false;
}
/**
* Returns the delegate for implementing accessibility support via
* composition. For more details see {@link AccessibilityDelegate}.
*
* @return The delegate, or null if none set.
*
* @hide
*/
public AccessibilityDelegate getAccessibilityDelegate() {
return mAccessibilityDelegate;
}
/**
* Sets a delegate for implementing accessibility support via composition
* (as opposed to inheritance). For more details, see
* {@link AccessibilityDelegate}.
* <p>
* <strong>Note:</strong> On platform versions prior to
* {@link android.os.Build.VERSION_CODES#M API 23}, delegate methods on
* views in the {@code android.widget.*} package are called <i>before</i>
* host methods. This prevents certain properties such as class name from
* being modified by overriding
* {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)},
* as any changes will be overwritten by the host class.
* <p>
* Starting in {@link android.os.Build.VERSION_CODES#M API 23}, delegate
* methods are called <i>after</i> host methods, which all properties to be
* modified without being overwritten by the host class.
*
* @param delegate the object to which accessibility method calls should be
* delegated
* @see AccessibilityDelegate
*/
public void setAccessibilityDelegate(@Nullable AccessibilityDelegate delegate) {
mAccessibilityDelegate = delegate;
}
/**
* Gets the provider for managing a virtual view hierarchy rooted at this View
* and reported to {@link android.accessibilityservice.AccessibilityService}s
* that explore the window content.
* <p>
* If this method returns an instance, this instance is responsible for managing
* {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this
* View including the one representing the View itself. Similarly the returned
* instance is responsible for performing accessibility actions on any virtual
* view or the root view itself.
* </p>
* <p>
* If an {@link AccessibilityDelegate} has been specified via calling
* {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
* {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)}
* is responsible for handling this call.
* </p>
*
* @return The provider.
*
* @see AccessibilityNodeProvider
*/
public AccessibilityNodeProvider getAccessibilityNodeProvider() {
if (mAccessibilityDelegate != null) {
return mAccessibilityDelegate.getAccessibilityNodeProvider(this);
} else {
return null;
}
}
/**
* Gets the unique identifier of this view on the screen for accessibility purposes.
* If this {@link View} is not attached to any window, {@value #NO_ID} is returned.
*
* @return The view accessibility id.
*
* @hide
*/
public int getAccessibilityViewId() {
if (mAccessibilityViewId == NO_ID) {
mAccessibilityViewId = sNextAccessibilityViewId++;
}
return mAccessibilityViewId;
}
/**
* Gets the unique identifier of the window in which this View reseides.
*
* @return The window accessibility id.
*
* @hide
*/
public int getAccessibilityWindowId() {
return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId
: AccessibilityNodeInfo.UNDEFINED_ITEM_ID;
}
/**
* Returns the {@link View}'s content description.
* <p>
* <strong>Note:</strong> Do not override this method, as it will have no
* effect on the content description presented to accessibility services.
* You must call {@link #setContentDescription(CharSequence)} to modify the
* content description.
*
* @return the content description
* @see #setContentDescription(CharSequence)
* @attr ref android.R.styleable#View_contentDescription
*/
@ViewDebug.ExportedProperty(category = "accessibility")
public CharSequence getContentDescription() {
return mContentDescription;
}
/**
* Sets the {@link View}'s content description.
* <p>
* A content description briefly describes the view and is primarily used
* for accessibility support to determine how a view should be presented to
* the user. In the case of a view with no textual representation, such as
* {@link android.widget.ImageButton}, a useful content description
* explains what the view does. For example, an image button with a phone
* icon that is used to place a call may use "Call" as its content
* description. An image of a floppy disk that is used to save a file may
* use "Save".
*
* @param contentDescription The content description.
* @see #getContentDescription()
* @attr ref android.R.styleable#View_contentDescription
*/
@RemotableViewMethod
public void setContentDescription(CharSequence contentDescription) {
if (mContentDescription == null) {
if (contentDescription == null) {
return;
}
} else if (mContentDescription.equals(contentDescription)) {
return;
}
mContentDescription = contentDescription;
final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0;
if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
notifySubtreeAccessibilityStateChangedIfNeeded();
} else {
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION);
}
}
/**
* Sets the id of a view before which this one is visited in accessibility traversal.
* A screen-reader must visit the content of this view before the content of the one
* it precedes. For example, if view B is set to be before view A, then a screen-reader
* will traverse the entire content of B before traversing the entire content of A,
* regardles of what traversal strategy it is using.
* <p>
* Views that do not have specified before/after relationships are traversed in order
* determined by the screen-reader.
* </p>
* <p>
* Setting that this view is before a view that is not important for accessibility
* or if this view is not important for accessibility will have no effect as the
* screen-reader is not aware of unimportant views.
* </p>
*
* @param beforeId The id of a view this one precedes in accessibility traversal.
*
* @attr ref android.R.styleable#View_accessibilityTraversalBefore
*
* @see #setImportantForAccessibility(int)
*/
@RemotableViewMethod
public void setAccessibilityTraversalBefore(int beforeId) {
if (mAccessibilityTraversalBeforeId == beforeId) {
return;
}
mAccessibilityTraversalBeforeId = beforeId;
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
/**
* Gets the id of a view before which this one is visited in accessibility traversal.
*
* @return The id of a view this one precedes in accessibility traversal if
* specified, otherwise {@link #NO_ID}.
*
* @see #setAccessibilityTraversalBefore(int)
*/
public int getAccessibilityTraversalBefore() {
return mAccessibilityTraversalBeforeId;
}
/**
* Sets the id of a view after which this one is visited in accessibility traversal.
* A screen-reader must visit the content of the other view before the content of this
* one. For example, if view B is set to be after view A, then a screen-reader
* will traverse the entire content of A before traversing the entire content of B,
* regardles of what traversal strategy it is using.
* <p>
* Views that do not have specified before/after relationships are traversed in order
* determined by the screen-reader.
* </p>
* <p>
* Setting that this view is after a view that is not important for accessibility
* or if this view is not important for accessibility will have no effect as the
* screen-reader is not aware of unimportant views.
* </p>
*
* @param afterId The id of a view this one succedees in accessibility traversal.
*
* @attr ref android.R.styleable#View_accessibilityTraversalAfter
*
* @see #setImportantForAccessibility(int)
*/
@RemotableViewMethod
public void setAccessibilityTraversalAfter(int afterId) {
if (mAccessibilityTraversalAfterId == afterId) {
return;
}
mAccessibilityTraversalAfterId = afterId;
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
/**
* Gets the id of a view after which this one is visited in accessibility traversal.
*
* @return The id of a view this one succeedes in accessibility traversal if
* specified, otherwise {@link #NO_ID}.
*
* @see #setAccessibilityTraversalAfter(int)
*/
public int getAccessibilityTraversalAfter() {
return mAccessibilityTraversalAfterId;
}
/**
* Gets the id of a view for which this view serves as a label for
* accessibility purposes.
*
* @return The labeled view id.
*/
@ViewDebug.ExportedProperty(category = "accessibility")
public int getLabelFor() {
return mLabelForId;
}
/**
* Sets the id of a view for which this view serves as a label for
* accessibility purposes.
*
* @param id The labeled view id.
*/
@RemotableViewMethod
public void setLabelFor(@IdRes int id) {
if (mLabelForId == id) {
return;
}
mLabelForId = id;
if (mLabelForId != View.NO_ID
&& mID == View.NO_ID) {
mID = generateViewId();
}
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
/**
* Invoked whenever this view loses focus, either by losing window focus or by losing
* focus within its window. This method can be used to clear any state tied to the
* focus. For instance, if a button is held pressed with the trackball and the window
* loses focus, this method can be used to cancel the press.
*
* Subclasses of View overriding this method should always call super.onFocusLost().
*
* @see #onFocusChanged(boolean, int, android.graphics.Rect)
* @see #onWindowFocusChanged(boolean)
*
* @hide pending API council approval
*/
@CallSuper
protected void onFocusLost() {
resetPressedState();
}
private void resetPressedState() {
if ((mViewFlags & ENABLED_MASK) == DISABLED) {
return;
}
if (isPressed()) {
setPressed(false);
if (!mHasPerformedLongPress) {
removeLongPressCallback();
}
}
}
/**
* Returns true if this view has focus
*
* @return True if this view has focus, false otherwise.
*/
@ViewDebug.ExportedProperty(category = "focus")
public boolean isFocused() {
return (mPrivateFlags & PFLAG_FOCUSED) != 0;
}
/**
* Find the view in the hierarchy rooted at this view that currently has
* focus.
*
* @return The view that currently has focus, or null if no focused view can
* be found.
*/
public View findFocus() {
return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null;
}
/**
* Indicates whether this view is one of the set of scrollable containers in
* its window.
*
* @return whether this view is one of the set of scrollable containers in
* its window
*
* @attr ref android.R.styleable#View_isScrollContainer
*/
public boolean isScrollContainer() {
return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0;
}
/**
* Change whether this view is one of the set of scrollable containers in
* its window. This will be used to determine whether the window can
* resize or must pan when a soft input area is open -- scrollable
* containers allow the window to use resize mode since the container
* will appropriately shrink.
*
* @attr ref android.R.styleable#View_isScrollContainer
*/
public void setScrollContainer(boolean isScrollContainer) {
if (isScrollContainer) {
if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) {
mAttachInfo.mScrollContainers.add(this);
mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED;
}
mPrivateFlags |= PFLAG_SCROLL_CONTAINER;
} else {
if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) {
mAttachInfo.mScrollContainers.remove(this);
}
mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED);
}
}
/**
* Returns the quality of the drawing cache.
*
* @return One of {@link #DRAWING_CACHE_QUALITY_AUTO},
* {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
*
* @see #setDrawingCacheQuality(int)
* @see #setDrawingCacheEnabled(boolean)
* @see #isDrawingCacheEnabled()
*
* @attr ref android.R.styleable#View_drawingCacheQuality
*/
@DrawingCacheQuality
public int getDrawingCacheQuality() {
return mViewFlags & DRAWING_CACHE_QUALITY_MASK;
}
/**
* Set the drawing cache quality of this view. This value is used only when the
* drawing cache is enabled
*
* @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO},
* {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH}
*
* @see #getDrawingCacheQuality()
* @see #setDrawingCacheEnabled(boolean)
* @see #isDrawingCacheEnabled()
*
* @attr ref android.R.styleable#View_drawingCacheQuality
*/
public void setDrawingCacheQuality(@DrawingCacheQuality int quality) {
setFlags(quality, DRAWING_CACHE_QUALITY_MASK);
}
/**
* Returns whether the screen should remain on, corresponding to the current
* value of {@link #KEEP_SCREEN_ON}.
*
* @return Returns true if {@link #KEEP_SCREEN_ON} is set.
*
* @see #setKeepScreenOn(boolean)
*
* @attr ref android.R.styleable#View_keepScreenOn
*/
public boolean getKeepScreenOn() {
return (mViewFlags & KEEP_SCREEN_ON) != 0;
}
/**
* Controls whether the screen should remain on, modifying the
* value of {@link #KEEP_SCREEN_ON}.
*
* @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}.
*
* @see #getKeepScreenOn()
*
* @attr ref android.R.styleable#View_keepScreenOn
*/
public void setKeepScreenOn(boolean keepScreenOn) {
setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON);
}
/**
* Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}.
* @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusLeft
*/
public int getNextFocusLeftId() {
return mNextFocusLeftId;
}
/**
* Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}.
* @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should
* decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusLeft
*/
public void setNextFocusLeftId(int nextFocusLeftId) {
mNextFocusLeftId = nextFocusLeftId;
}
/**
* Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}.
* @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusRight
*/
public int getNextFocusRightId() {
return mNextFocusRightId;
}
/**
* Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}.
* @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should
* decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusRight
*/
public void setNextFocusRightId(int nextFocusRightId) {
mNextFocusRightId = nextFocusRightId;
}
/**
* Gets the id of the view to use when the next focus is {@link #FOCUS_UP}.
* @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusUp
*/
public int getNextFocusUpId() {
return mNextFocusUpId;
}
/**
* Sets the id of the view to use when the next focus is {@link #FOCUS_UP}.
* @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should
* decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusUp
*/
public void setNextFocusUpId(int nextFocusUpId) {
mNextFocusUpId = nextFocusUpId;
}
/**
* Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}.
* @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusDown
*/
public int getNextFocusDownId() {
return mNextFocusDownId;
}
/**
* Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}.
* @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should
* decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusDown
*/
public void setNextFocusDownId(int nextFocusDownId) {
mNextFocusDownId = nextFocusDownId;
}
/**
* Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}.
* @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusForward
*/
public int getNextFocusForwardId() {
return mNextFocusForwardId;
}
/**
* Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}.
* @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should
* decide automatically.
*
* @attr ref android.R.styleable#View_nextFocusForward
*/
public void setNextFocusForwardId(int nextFocusForwardId) {
mNextFocusForwardId = nextFocusForwardId;
}
/**
* Returns the visibility of this view and all of its ancestors
*
* @return True if this view and all of its ancestors are {@link #VISIBLE}
*/
public boolean isShown() {
View current = this;
//noinspection ConstantConditions
do {
if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) {
return false;
}
ViewParent parent = current.mParent;
if (parent == null) {
return false; // We are not attached to the view root
}
if (!(parent instanceof View)) {
return true;
}
current = (View) parent;
} while (current != null);
return false;
}
/**
* Called by the view hierarchy when the content insets for a window have
* changed, to allow it to adjust its content to fit within those windows.
* The content insets tell you the space that the status bar, input method,
* and other system windows infringe on the application's window.
*
* <p>You do not normally need to deal with this function, since the default
* window decoration given to applications takes care of applying it to the
* content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}
* or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case,
* and your content can be placed under those system elements. You can then
* use this method within your view hierarchy if you have parts of your UI
* which you would like to ensure are not being covered.
*
* <p>The default implementation of this method simply applies the content
* insets to the view's padding, consuming that content (modifying the
* insets to be 0), and returning true. This behavior is off by default, but can
* be enabled through {@link #setFitsSystemWindows(boolean)}.
*
* <p>This function's traversal down the hierarchy is depth-first. The same content
* insets object is propagated down the hierarchy, so any changes made to it will
* be seen by all following views (including potentially ones above in
* the hierarchy since this is a depth-first traversal). The first view
* that returns true will abort the entire traversal.
*
* <p>The default implementation works well for a situation where it is
* used with a container that covers the entire window, allowing it to
* apply the appropriate insets to its content on all edges. If you need
* a more complicated layout (such as two different views fitting system
* windows, one on the top of the window, and one on the bottom),
* you can override the method and handle the insets however you would like.
* Note that the insets provided by the framework are always relative to the
* far edges of the window, not accounting for the location of the called view
* within that window. (In fact when this method is called you do not yet know
* where the layout will place the view, as it is done before layout happens.)
*
* <p>Note: unlike many View methods, there is no dispatch phase to this
* call. If you are overriding it in a ViewGroup and want to allow the
* call to continue to your children, you must be sure to call the super
* implementation.
*
* <p>Here is a sample layout that makes use of fitting system windows
* to have controls for a video view placed inside of the window decorations
* that it hides and shows. This can be used with code like the second
* sample (video player) shown in {@link #setSystemUiVisibility(int)}.
*
* {@sample development/samples/ApiDemos/res/layout/video_player.xml complete}
*
* @param insets Current content insets of the window. Prior to
* {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify
* the insets or else you and Android will be unhappy.
*
* @return {@code true} if this view applied the insets and it should not
* continue propagating further down the hierarchy, {@code false} otherwise.
* @see #getFitsSystemWindows()
* @see #setFitsSystemWindows(boolean)
* @see #setSystemUiVisibility(int)
*
* @deprecated As of API 20 use {@link #dispatchApplyWindowInsets(WindowInsets)} to apply
* insets to views. Views should override {@link #onApplyWindowInsets(WindowInsets)} or use
* {@link #setOnApplyWindowInsetsListener(android.view.View.OnApplyWindowInsetsListener)}
* to implement handling their own insets.
*/
protected boolean fitSystemWindows(Rect insets) {
if ((mPrivateFlags3 & PFLAG3_APPLYING_INSETS) == 0) {
if (insets == null) {
// Null insets by definition have already been consumed.
// This call cannot apply insets since there are none to apply,
// so return false.
return false;
}
// If we're not in the process of dispatching the newer apply insets call,
// that means we're not in the compatibility path. Dispatch into the newer
// apply insets path and take things from there.
try {
mPrivateFlags3 |= PFLAG3_FITTING_SYSTEM_WINDOWS;
return dispatchApplyWindowInsets(new WindowInsets(insets)).isConsumed();
} finally {
mPrivateFlags3 &= ~PFLAG3_FITTING_SYSTEM_WINDOWS;
}
} else {
// We're being called from the newer apply insets path.
// Perform the standard fallback behavior.
return fitSystemWindowsInt(insets);
}
}
private boolean fitSystemWindowsInt(Rect insets) {
if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) {
mUserPaddingStart = UNDEFINED_PADDING;
mUserPaddingEnd = UNDEFINED_PADDING;
Rect localInsets = sThreadLocal.get();
if (localInsets == null) {
localInsets = new Rect();
sThreadLocal.set(localInsets);
}
boolean res = computeFitSystemWindows(insets, localInsets);
mUserPaddingLeftInitial = localInsets.left;
mUserPaddingRightInitial = localInsets.right;
internalSetPadding(localInsets.left, localInsets.top,
localInsets.right, localInsets.bottom);
return res;
}
return false;
}
/**
* Called when the view should apply {@link WindowInsets} according to its internal policy.
*
* <p>This method should be overridden by views that wish to apply a policy different from or
* in addition to the default behavior. Clients that wish to force a view subtree
* to apply insets should call {@link #dispatchApplyWindowInsets(WindowInsets)}.</p>
*
* <p>Clients may supply an {@link OnApplyWindowInsetsListener} to a view. If one is set
* it will be called during dispatch instead of this method. The listener may optionally
* call this method from its own implementation if it wishes to apply the view's default
* insets policy in addition to its own.</p>
*
* <p>Implementations of this method should either return the insets parameter unchanged
* or a new {@link WindowInsets} cloned from the supplied insets with any insets consumed
* that this view applied itself. This allows new inset types added in future platform
* versions to pass through existing implementations unchanged without being erroneously
* consumed.</p>
*
* <p>By default if a view's {@link #setFitsSystemWindows(boolean) fitsSystemWindows}
* property is set then the view will consume the system window insets and apply them
* as padding for the view.</p>
*
* @param insets Insets to apply
* @return The supplied insets with any applied insets consumed
*/
public WindowInsets onApplyWindowInsets(WindowInsets insets) {
if ((mPrivateFlags3 & PFLAG3_FITTING_SYSTEM_WINDOWS) == 0) {
// We weren't called from within a direct call to fitSystemWindows,
// call into it as a fallback in case we're in a class that overrides it
// and has logic to perform.
if (fitSystemWindows(insets.getSystemWindowInsets())) {
return insets.consumeSystemWindowInsets();
}
} else {
// We were called from within a direct call to fitSystemWindows.
if (fitSystemWindowsInt(insets.getSystemWindowInsets())) {
return insets.consumeSystemWindowInsets();
}
}
return insets;
}
/**
* Set an {@link OnApplyWindowInsetsListener} to take over the policy for applying
* window insets to this view. The listener's
* {@link OnApplyWindowInsetsListener#onApplyWindowInsets(View, WindowInsets) onApplyWindowInsets}
* method will be called instead of the view's
* {@link #onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method.
*
* @param listener Listener to set
*
* @see #onApplyWindowInsets(WindowInsets)
*/
public void setOnApplyWindowInsetsListener(OnApplyWindowInsetsListener listener) {
getListenerInfo().mOnApplyWindowInsetsListener = listener;
}
/**
* Request to apply the given window insets to this view or another view in its subtree.
*
* <p>This method should be called by clients wishing to apply insets corresponding to areas
* obscured by window decorations or overlays. This can include the status and navigation bars,
* action bars, input methods and more. New inset categories may be added in the future.
* The method returns the insets provided minus any that were applied by this view or its
* children.</p>
*
* <p>Clients wishing to provide custom behavior should override the
* {@link #onApplyWindowInsets(WindowInsets)} method or alternatively provide a
* {@link OnApplyWindowInsetsListener} via the
* {@link #setOnApplyWindowInsetsListener(View.OnApplyWindowInsetsListener) setOnApplyWindowInsetsListener}
* method.</p>
*
* <p>This method replaces the older {@link #fitSystemWindows(Rect) fitSystemWindows} method.
* </p>
*
* @param insets Insets to apply
* @return The provided insets minus the insets that were consumed
*/
public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {
try {
mPrivateFlags3 |= PFLAG3_APPLYING_INSETS;
if (mListenerInfo != null && mListenerInfo.mOnApplyWindowInsetsListener != null) {
return mListenerInfo.mOnApplyWindowInsetsListener.onApplyWindowInsets(this, insets);
} else {
return onApplyWindowInsets(insets);
}
} finally {
mPrivateFlags3 &= ~PFLAG3_APPLYING_INSETS;
}
}
/**
* Compute the view's coordinate within the surface.
*
* <p>Computes the coordinates of this view in its surface. The argument
* must be an array of two integers. After the method returns, the array
* contains the x and y location in that order.</p>
* @hide
* @param location an array of two integers in which to hold the coordinates
*/
public void getLocationInSurface(@Size(2) int[] location) {
getLocationInWindow(location);
if (mAttachInfo != null && mAttachInfo.mViewRootImpl != null) {
location[0] += mAttachInfo.mViewRootImpl.mWindowAttributes.surfaceInsets.left;
location[1] += mAttachInfo.mViewRootImpl.mWindowAttributes.surfaceInsets.top;
}
}
/**
* Provide original WindowInsets that are dispatched to the view hierarchy. The insets are
* only available if the view is attached.
*
* @return WindowInsets from the top of the view hierarchy or null if View is detached
*/
public WindowInsets getRootWindowInsets() {
if (mAttachInfo != null) {
return mAttachInfo.mViewRootImpl.getWindowInsets(false /* forceConstruct */);
}
return null;
}
/**
* @hide Compute the insets that should be consumed by this view and the ones
* that should propagate to those under it.
*/
protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) {
if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0
|| mAttachInfo == null
|| ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0
&& !mAttachInfo.mOverscanRequested)) {
outLocalInsets.set(inoutInsets);
inoutInsets.set(0, 0, 0, 0);
return true;
} else {
// The application wants to take care of fitting system window for
// the content... however we still need to take care of any overscan here.
final Rect overscan = mAttachInfo.mOverscanInsets;
outLocalInsets.set(overscan);
inoutInsets.left -= overscan.left;
inoutInsets.top -= overscan.top;
inoutInsets.right -= overscan.right;
inoutInsets.bottom -= overscan.bottom;
return false;
}
}
/**
* Compute insets that should be consumed by this view and the ones that should propagate
* to those under it.
*
* @param in Insets currently being processed by this View, likely received as a parameter
* to {@link #onApplyWindowInsets(WindowInsets)}.
* @param outLocalInsets A Rect that will receive the insets that should be consumed
* by this view
* @return Insets that should be passed along to views under this one
*/
public WindowInsets computeSystemWindowInsets(WindowInsets in, Rect outLocalInsets) {
if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0
|| mAttachInfo == null
|| (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) {
outLocalInsets.set(in.getSystemWindowInsets());
return in.consumeSystemWindowInsets();
} else {
outLocalInsets.set(0, 0, 0, 0);
return in;
}
}
/**
* Sets whether or not this view should account for system screen decorations
* such as the status bar and inset its content; that is, controlling whether
* the default implementation of {@link #fitSystemWindows(Rect)} will be
* executed. See that method for more details.
*
* <p>Note that if you are providing your own implementation of
* {@link #fitSystemWindows(Rect)}, then there is no need to set this
* flag to true -- your implementation will be overriding the default
* implementation that checks this flag.
*
* @param fitSystemWindows If true, then the default implementation of
* {@link #fitSystemWindows(Rect)} will be executed.
*
* @attr ref android.R.styleable#View_fitsSystemWindows
* @see #getFitsSystemWindows()
* @see #fitSystemWindows(Rect)
* @see #setSystemUiVisibility(int)
*/
public void setFitsSystemWindows(boolean fitSystemWindows) {
setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS);
}
/**
* Check for state of {@link #setFitsSystemWindows(boolean)}. If this method
* returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)}
* will be executed.
*
* @return {@code true} if the default implementation of
* {@link #fitSystemWindows(Rect)} will be executed.
*
* @attr ref android.R.styleable#View_fitsSystemWindows
* @see #setFitsSystemWindows(boolean)
* @see #fitSystemWindows(Rect)
* @see #setSystemUiVisibility(int)
*/
@ViewDebug.ExportedProperty
public boolean getFitsSystemWindows() {
return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS;
}
/** @hide */
public boolean fitsSystemWindows() {
return getFitsSystemWindows();
}
/**
* Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed.
* @deprecated Use {@link #requestApplyInsets()} for newer platform versions.
*/
public void requestFitSystemWindows() {
if (mParent != null) {
mParent.requestFitSystemWindows();
}
}
/**
* Ask that a new dispatch of {@link #onApplyWindowInsets(WindowInsets)} be performed.
*/
public void requestApplyInsets() {
requestFitSystemWindows();
}
/**
* For use by PhoneWindow to make its own system window fitting optional.
* @hide
*/
public void makeOptionalFitsSystemWindows() {
setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS);
}
/**
* Returns the outsets, which areas of the device that aren't a surface, but we would like to
* treat them as such.
* @hide
*/
public void getOutsets(Rect outOutsetRect) {
if (mAttachInfo != null) {
outOutsetRect.set(mAttachInfo.mOutsets);
} else {
outOutsetRect.setEmpty();
}
}
/**
* Returns the visibility status for this view.
*
* @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
* @attr ref android.R.styleable#View_visibility
*/
@ViewDebug.ExportedProperty(mapping = {
@ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"),
@ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"),
@ViewDebug.IntToString(from = GONE, to = "GONE")
})
@Visibility
public int getVisibility() {
return mViewFlags & VISIBILITY_MASK;
}
/**
* Set the visibility state of this view.
*
* @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
* @attr ref android.R.styleable#View_visibility
*/
@RemotableViewMethod
public void setVisibility(@Visibility int visibility) {
setFlags(visibility, VISIBILITY_MASK);
}
/**
* Returns the enabled status for this view. The interpretation of the
* enabled state varies by subclass.
*
* @return True if this view is enabled, false otherwise.
*/
@ViewDebug.ExportedProperty
public boolean isEnabled() {
return (mViewFlags & ENABLED_MASK) == ENABLED;
}
/**
* Set the enabled state of this view. The interpretation of the enabled
* state varies by subclass.
*
* @param enabled True if this view is enabled, false otherwise.
*/
@RemotableViewMethod
public void setEnabled(boolean enabled) {
if (enabled == isEnabled()) return;
setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK);
/*
* The View most likely has to change its appearance, so refresh
* the drawable state.
*/
refreshDrawableState();
// Invalidate too, since the default behavior for views is to be
// be drawn at 50% alpha rather than to change the drawable.
invalidate(true);
if (!enabled) {
cancelPendingInputEvents();
}
}
/**
* Set whether this view can receive the focus.
*
* Setting this to false will also ensure that this view is not focusable
* in touch mode.
*
* @param focusable If true, this view can receive the focus.
*
* @see #setFocusableInTouchMode(boolean)
* @attr ref android.R.styleable#View_focusable
*/
public void setFocusable(boolean focusable) {
if (!focusable) {
setFlags(0, FOCUSABLE_IN_TOUCH_MODE);
}
setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK);
}
/**
* Set whether this view can receive focus while in touch mode.
*
* Setting this to true will also ensure that this view is focusable.
*
* @param focusableInTouchMode If true, this view can receive the focus while
* in touch mode.
*
* @see #setFocusable(boolean)
* @attr ref android.R.styleable#View_focusableInTouchMode
*/
public void setFocusableInTouchMode(boolean focusableInTouchMode) {
// Focusable in touch mode should always be set before the focusable flag
// otherwise, setting the focusable flag will trigger a focusableViewAvailable()
// which, in touch mode, will not successfully request focus on this view
// because the focusable in touch mode flag is not set
setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE);
if (focusableInTouchMode) {
setFlags(FOCUSABLE, FOCUSABLE_MASK);
}
}
/**
* Set whether this view should have sound effects enabled for events such as
* clicking and touching.
*
* <p>You may wish to disable sound effects for a view if you already play sounds,
* for instance, a dial key that plays dtmf tones.
*
* @param soundEffectsEnabled whether sound effects are enabled for this view.
* @see #isSoundEffectsEnabled()
* @see #playSoundEffect(int)
* @attr ref android.R.styleable#View_soundEffectsEnabled
*/
public void setSoundEffectsEnabled(boolean soundEffectsEnabled) {
setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED);
}
/**
* @return whether this view should have sound effects enabled for events such as
* clicking and touching.
*
* @see #setSoundEffectsEnabled(boolean)
* @see #playSoundEffect(int)
* @attr ref android.R.styleable#View_soundEffectsEnabled
*/
@ViewDebug.ExportedProperty
public boolean isSoundEffectsEnabled() {
return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED);
}
/**
* Set whether this view should have haptic feedback for events such as
* long presses.
*
* <p>You may wish to disable haptic feedback if your view already controls
* its own haptic feedback.
*
* @param hapticFeedbackEnabled whether haptic feedback enabled for this view.
* @see #isHapticFeedbackEnabled()
* @see #performHapticFeedback(int)
* @attr ref android.R.styleable#View_hapticFeedbackEnabled
*/
public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) {
setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED);
}
/**
* @return whether this view should have haptic feedback enabled for events
* long presses.
*
* @see #setHapticFeedbackEnabled(boolean)
* @see #performHapticFeedback(int)
* @attr ref android.R.styleable#View_hapticFeedbackEnabled
*/
@ViewDebug.ExportedProperty
public boolean isHapticFeedbackEnabled() {
return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED);
}
/**
* Returns the layout direction for this view.
*
* @return One of {@link #LAYOUT_DIRECTION_LTR},
* {@link #LAYOUT_DIRECTION_RTL},
* {@link #LAYOUT_DIRECTION_INHERIT} or
* {@link #LAYOUT_DIRECTION_LOCALE}.
*
* @attr ref android.R.styleable#View_layoutDirection
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "layout", mapping = {
@ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"),
@ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"),
@ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"),
@ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE")
})
@LayoutDir
public int getRawLayoutDirection() {
return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT;
}
/**
* Set the layout direction for this view. This will propagate a reset of layout direction
* resolution to the view's children and resolve layout direction for this view.
*
* @param layoutDirection the layout direction to set. Should be one of:
*
* {@link #LAYOUT_DIRECTION_LTR},
* {@link #LAYOUT_DIRECTION_RTL},
* {@link #LAYOUT_DIRECTION_INHERIT},
* {@link #LAYOUT_DIRECTION_LOCALE}.
*
* Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution
* proceeds up the parent chain of the view to get the value. If there is no parent, then it
* will return the default {@link #LAYOUT_DIRECTION_LTR}.
*
* @attr ref android.R.styleable#View_layoutDirection
*/
@RemotableViewMethod
public void setLayoutDirection(@LayoutDir int layoutDirection) {
if (getRawLayoutDirection() != layoutDirection) {
// Reset the current layout direction and the resolved one
mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK;
resetRtlProperties();
// Set the new layout direction (filtered)
mPrivateFlags2 |=
((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK);
// We need to resolve all RTL properties as they all depend on layout direction
resolveRtlPropertiesIfNeeded();
requestLayout();
invalidate(true);
}
}
/**
* Returns the resolved layout direction for this view.
*
* @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns
* {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL.
*
* For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version
* is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}.
*
* @attr ref android.R.styleable#View_layoutDirection
*/
@ViewDebug.ExportedProperty(category = "layout", mapping = {
@ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"),
@ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL")
})
@ResolvedLayoutDir
public int getLayoutDirection() {
final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion;
if (targetSdkVersion < JELLY_BEAN_MR1) {
mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED;
return LAYOUT_DIRECTION_RESOLVED_DEFAULT;
}
return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ==
PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR;
}
/**
* Indicates whether or not this view's layout is right-to-left. This is resolved from
* layout attribute and/or the inherited value from the parent
*
* @return true if the layout is right-to-left.
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "layout")
public boolean isLayoutRtl() {
return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
}
/**
* Indicates whether the view is currently tracking transient state that the
* app should not need to concern itself with saving and restoring, but that
* the framework should take special note to preserve when possible.
*
* <p>A view with transient state cannot be trivially rebound from an external
* data source, such as an adapter binding item views in a list. This may be
* because the view is performing an animation, tracking user selection
* of content, or similar.</p>
*
* @return true if the view has transient state
*/
@ViewDebug.ExportedProperty(category = "layout")
public boolean hasTransientState() {
return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE;
}
/**
* Set whether this view is currently tracking transient state that the
* framework should attempt to preserve when possible. This flag is reference counted,
* so every call to setHasTransientState(true) should be paired with a later call
* to setHasTransientState(false).
*
* <p>A view with transient state cannot be trivially rebound from an external
* data source, such as an adapter binding item views in a list. This may be
* because the view is performing an animation, tracking user selection
* of content, or similar.</p>
*
* @param hasTransientState true if this view has transient state
*/
public void setHasTransientState(boolean hasTransientState) {
mTransientStateCount = hasTransientState ? mTransientStateCount + 1 :
mTransientStateCount - 1;
if (mTransientStateCount < 0) {
mTransientStateCount = 0;
Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " +
"unmatched pair of setHasTransientState calls");
} else if ((hasTransientState && mTransientStateCount == 1) ||
(!hasTransientState && mTransientStateCount == 0)) {
// update flag if we've just incremented up from 0 or decremented down to 0
mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) |
(hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0);
if (mParent != null) {
try {
mParent.childHasTransientStateChanged(this, hasTransientState);
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
}
}
}
}
/**
* Returns true if this view is currently attached to a window.
*/
public boolean isAttachedToWindow() {
return mAttachInfo != null;
}
/**
* Returns true if this view has been through at least one layout since it
* was last attached to or detached from a window.
*/
public boolean isLaidOut() {
return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT;
}
/**
* If this view doesn't do any drawing on its own, set this flag to
* allow further optimizations. By default, this flag is not set on
* View, but could be set on some View subclasses such as ViewGroup.
*
* Typically, if you override {@link #onDraw(android.graphics.Canvas)}
* you should clear this flag.
*
* @param willNotDraw whether or not this View draw on its own
*/
public void setWillNotDraw(boolean willNotDraw) {
setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK);
}
/**
* Returns whether or not this View draws on its own.
*
* @return true if this view has nothing to draw, false otherwise
*/
@ViewDebug.ExportedProperty(category = "drawing")
public boolean willNotDraw() {
return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW;
}
/**
* When a View's drawing cache is enabled, drawing is redirected to an
* offscreen bitmap. Some views, like an ImageView, must be able to
* bypass this mechanism if they already draw a single bitmap, to avoid
* unnecessary usage of the memory.
*
* @param willNotCacheDrawing true if this view does not cache its
* drawing, false otherwise
*/
public void setWillNotCacheDrawing(boolean willNotCacheDrawing) {
setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING);
}
/**
* Returns whether or not this View can cache its drawing or not.
*
* @return true if this view does not cache its drawing, false otherwise
*/
@ViewDebug.ExportedProperty(category = "drawing")
public boolean willNotCacheDrawing() {
return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING;
}
/**
* Indicates whether this view reacts to click events or not.
*
* @return true if the view is clickable, false otherwise
*
* @see #setClickable(boolean)
* @attr ref android.R.styleable#View_clickable
*/
@ViewDebug.ExportedProperty
public boolean isClickable() {
return (mViewFlags & CLICKABLE) == CLICKABLE;
}
/**
* Enables or disables click events for this view. When a view
* is clickable it will change its state to "pressed" on every click.
* Subclasses should set the view clickable to visually react to
* user's clicks.
*
* @param clickable true to make the view clickable, false otherwise
*
* @see #isClickable()
* @attr ref android.R.styleable#View_clickable
*/
public void setClickable(boolean clickable) {
setFlags(clickable ? CLICKABLE : 0, CLICKABLE);
}
/**
* Indicates whether this view reacts to long click events or not.
*
* @return true if the view is long clickable, false otherwise
*
* @see #setLongClickable(boolean)
* @attr ref android.R.styleable#View_longClickable
*/
public boolean isLongClickable() {
return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE;
}
/**
* Enables or disables long click events for this view. When a view is long
* clickable it reacts to the user holding down the button for a longer
* duration than a tap. This event can either launch the listener or a
* context menu.
*
* @param longClickable true to make the view long clickable, false otherwise
* @see #isLongClickable()
* @attr ref android.R.styleable#View_longClickable
*/
public void setLongClickable(boolean longClickable) {
setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE);
}
/**
* Indicates whether this view reacts to context clicks or not.
*
* @return true if the view is context clickable, false otherwise
* @see #setContextClickable(boolean)
* @attr ref android.R.styleable#View_contextClickable
*/
public boolean isContextClickable() {
return (mViewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE;
}
/**
* Enables or disables context clicking for this view. This event can launch the listener.
*
* @param contextClickable true to make the view react to a context click, false otherwise
* @see #isContextClickable()
* @attr ref android.R.styleable#View_contextClickable
*/
public void setContextClickable(boolean contextClickable) {
setFlags(contextClickable ? CONTEXT_CLICKABLE : 0, CONTEXT_CLICKABLE);
}
/**
* Sets the pressed state for this view and provides a touch coordinate for
* animation hinting.
*
* @param pressed Pass true to set the View's internal state to "pressed",
* or false to reverts the View's internal state from a
* previously set "pressed" state.
* @param x The x coordinate of the touch that caused the press
* @param y The y coordinate of the touch that caused the press
*/
private void setPressed(boolean pressed, float x, float y) {
if (pressed) {
drawableHotspotChanged(x, y);
}
setPressed(pressed);
}
/**
* Sets the pressed state for this view.
*
* @see #isClickable()
* @see #setClickable(boolean)
*
* @param pressed Pass true to set the View's internal state to "pressed", or false to reverts
* the View's internal state from a previously set "pressed" state.
*/
public void setPressed(boolean pressed) {
final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED);
if (pressed) {
mPrivateFlags |= PFLAG_PRESSED;
} else {
mPrivateFlags &= ~PFLAG_PRESSED;
}
if (needsRefresh) {
refreshDrawableState();
}
dispatchSetPressed(pressed);
}
/**
* Dispatch setPressed to all of this View's children.
*
* @see #setPressed(boolean)
*
* @param pressed The new pressed state
*/
protected void dispatchSetPressed(boolean pressed) {
}
/**
* Indicates whether the view is currently in pressed state. Unless
* {@link #setPressed(boolean)} is explicitly called, only clickable views can enter
* the pressed state.
*
* @see #setPressed(boolean)
* @see #isClickable()
* @see #setClickable(boolean)
*
* @return true if the view is currently pressed, false otherwise
*/
@ViewDebug.ExportedProperty
public boolean isPressed() {
return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED;
}
/**
* @hide
* Indicates whether this view will participate in data collection through
* {@link ViewStructure}. If true, it will not provide any data
* for itself or its children. If false, the normal data collection will be allowed.
*
* @return Returns false if assist data collection is not blocked, else true.
*
* @see #setAssistBlocked(boolean)
* @attr ref android.R.styleable#View_assistBlocked
*/
public boolean isAssistBlocked() {
return (mPrivateFlags3 & PFLAG3_ASSIST_BLOCKED) != 0;
}
/**
* @hide
* Controls whether assist data collection from this view and its children is enabled
* (that is, whether {@link #onProvideStructure} and
* {@link #onProvideVirtualStructure} will be called). The default value is false,
* allowing normal assist collection. Setting this to false will disable assist collection.
*
* @param enabled Set to true to <em>disable</em> assist data collection, or false
* (the default) to allow it.
*
* @see #isAssistBlocked()
* @see #onProvideStructure
* @see #onProvideVirtualStructure
* @attr ref android.R.styleable#View_assistBlocked
*/
public void setAssistBlocked(boolean enabled) {
if (enabled) {
mPrivateFlags3 |= PFLAG3_ASSIST_BLOCKED;
} else {
mPrivateFlags3 &= ~PFLAG3_ASSIST_BLOCKED;
}
}
/**
* Indicates whether this view will save its state (that is,
* whether its {@link #onSaveInstanceState} method will be called).
*
* @return Returns true if the view state saving is enabled, else false.
*
* @see #setSaveEnabled(boolean)
* @attr ref android.R.styleable#View_saveEnabled
*/
public boolean isSaveEnabled() {
return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED;
}
/**
* Controls whether the saving of this view's state is
* enabled (that is, whether its {@link #onSaveInstanceState} method
* will be called). Note that even if freezing is enabled, the
* view still must have an id assigned to it (via {@link #setId(int)})
* for its state to be saved. This flag can only disable the
* saving of this view; any child views may still have their state saved.
*
* @param enabled Set to false to <em>disable</em> state saving, or true
* (the default) to allow it.
*
* @see #isSaveEnabled()
* @see #setId(int)
* @see #onSaveInstanceState()
* @attr ref android.R.styleable#View_saveEnabled
*/
public void setSaveEnabled(boolean enabled) {
setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK);
}
/**
* Gets whether the framework should discard touches when the view's
* window is obscured by another visible window.
* Refer to the {@link View} security documentation for more details.
*
* @return True if touch filtering is enabled.
*
* @see #setFilterTouchesWhenObscured(boolean)
* @attr ref android.R.styleable#View_filterTouchesWhenObscured
*/
@ViewDebug.ExportedProperty
public boolean getFilterTouchesWhenObscured() {
return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0;
}
/**
* Sets whether the framework should discard touches when the view's
* window is obscured by another visible window.
* Refer to the {@link View} security documentation for more details.
*
* @param enabled True if touch filtering should be enabled.
*
* @see #getFilterTouchesWhenObscured
* @attr ref android.R.styleable#View_filterTouchesWhenObscured
*/
public void setFilterTouchesWhenObscured(boolean enabled) {
setFlags(enabled ? FILTER_TOUCHES_WHEN_OBSCURED : 0,
FILTER_TOUCHES_WHEN_OBSCURED);
}
/**
* Indicates whether the entire hierarchy under this view will save its
* state when a state saving traversal occurs from its parent. The default
* is true; if false, these views will not be saved unless
* {@link #saveHierarchyState(SparseArray)} is called directly on this view.
*
* @return Returns true if the view state saving from parent is enabled, else false.
*
* @see #setSaveFromParentEnabled(boolean)
*/
public boolean isSaveFromParentEnabled() {
return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED;
}
/**
* Controls whether the entire hierarchy under this view will save its
* state when a state saving traversal occurs from its parent. The default
* is true; if false, these views will not be saved unless
* {@link #saveHierarchyState(SparseArray)} is called directly on this view.
*
* @param enabled Set to false to <em>disable</em> state saving, or true
* (the default) to allow it.
*
* @see #isSaveFromParentEnabled()
* @see #setId(int)
* @see #onSaveInstanceState()
*/
public void setSaveFromParentEnabled(boolean enabled) {
setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK);
}
/**
* Returns whether this View is able to take focus.
*
* @return True if this view can take focus, or false otherwise.
* @attr ref android.R.styleable#View_focusable
*/
@ViewDebug.ExportedProperty(category = "focus")
public final boolean isFocusable() {
return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK);
}
/**
* When a view is focusable, it may not want to take focus when in touch mode.
* For example, a button would like focus when the user is navigating via a D-pad
* so that the user can click on it, but once the user starts touching the screen,
* the button shouldn't take focus
* @return Whether the view is focusable in touch mode.
* @attr ref android.R.styleable#View_focusableInTouchMode
*/
@ViewDebug.ExportedProperty
public final boolean isFocusableInTouchMode() {
return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE);
}
/**
* Find the nearest view in the specified direction that can take focus.
* This does not actually give focus to that view.
*
* @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
*
* @return The nearest focusable in the specified direction, or null if none
* can be found.
*/
public View focusSearch(@FocusRealDirection int direction) {
if (mParent != null) {
return mParent.focusSearch(this, direction);
} else {
return null;
}
}
/**
* This method is the last chance for the focused view and its ancestors to
* respond to an arrow key. This is called when the focused view did not
* consume the key internally, nor could the view system find a new view in
* the requested direction to give focus to.
*
* @param focused The currently focused view.
* @param direction The direction focus wants to move. One of FOCUS_UP,
* FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT.
* @return True if the this view consumed this unhandled move.
*/
public boolean dispatchUnhandledMove(View focused, @FocusRealDirection int direction) {
return false;
}
/**
* If a user manually specified the next view id for a particular direction,
* use the root to look up the view.
* @param root The root view of the hierarchy containing this view.
* @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD,
* or FOCUS_BACKWARD.
* @return The user specified next view, or null if there is none.
*/
View findUserSetNextFocus(View root, @FocusDirection int direction) {
switch (direction) {
case FOCUS_LEFT:
if (mNextFocusLeftId == View.NO_ID) return null;
return findViewInsideOutShouldExist(root, mNextFocusLeftId);
case FOCUS_RIGHT:
if (mNextFocusRightId == View.NO_ID) return null;
return findViewInsideOutShouldExist(root, mNextFocusRightId);
case FOCUS_UP:
if (mNextFocusUpId == View.NO_ID) return null;
return findViewInsideOutShouldExist(root, mNextFocusUpId);
case FOCUS_DOWN:
if (mNextFocusDownId == View.NO_ID) return null;
return findViewInsideOutShouldExist(root, mNextFocusDownId);
case FOCUS_FORWARD:
if (mNextFocusForwardId == View.NO_ID) return null;
return findViewInsideOutShouldExist(root, mNextFocusForwardId);
case FOCUS_BACKWARD: {
if (mID == View.NO_ID) return null;
final int id = mID;
return root.findViewByPredicateInsideOut(this, new Predicate<View>() {
@Override
public boolean test(View t) {
return t.mNextFocusForwardId == id;
}
});
}
}
return null;
}
private View findViewInsideOutShouldExist(View root, int id) {
if (mMatchIdPredicate == null) {
mMatchIdPredicate = new MatchIdPredicate();
}
mMatchIdPredicate.mId = id;
View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate);
if (result == null) {
Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id);
}
return result;
}
/**
* Find and return all focusable views that are descendants of this view,
* possibly including this view if it is focusable itself.
*
* @param direction The direction of the focus
* @return A list of focusable views
*/
public ArrayList<View> getFocusables(@FocusDirection int direction) {
ArrayList<View> result = new ArrayList<View>(24);
addFocusables(result, direction);
return result;
}
/**
* Add any focusable views that are descendants of this view (possibly
* including this view if it is focusable itself) to views. If we are in touch mode,
* only add views that are also focusable in touch mode.
*
* @param views Focusable views found so far
* @param direction The direction of the focus
*/
public void addFocusables(ArrayList<View> views, @FocusDirection int direction) {
addFocusables(views, direction, isInTouchMode() ? FOCUSABLES_TOUCH_MODE : FOCUSABLES_ALL);
}
/**
* Adds any focusable views that are descendants of this view (possibly
* including this view if it is focusable itself) to views. This method
* adds all focusable views regardless if we are in touch mode or
* only views focusable in touch mode if we are in touch mode or
* only views that can take accessibility focus if accessibility is enabled
* depending on the focusable mode parameter.
*
* @param views Focusable views found so far or null if all we are interested is
* the number of focusables.
* @param direction The direction of the focus.
* @param focusableMode The type of focusables to be added.
*
* @see #FOCUSABLES_ALL
* @see #FOCUSABLES_TOUCH_MODE
*/
public void addFocusables(ArrayList<View> views, @FocusDirection int direction,
@FocusableMode int focusableMode) {
if (views == null) {
return;
}
if (!isFocusable()) {
return;
}
if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE
&& !isFocusableInTouchMode()) {
return;
}
views.add(this);
}
/**
* Finds the Views that contain given text. The containment is case insensitive.
* The search is performed by either the text that the View renders or the content
* description that describes the view for accessibility purposes and the view does
* not render or both. Clients can specify how the search is to be performed via
* passing the {@link #FIND_VIEWS_WITH_TEXT} and
* {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags.
*
* @param outViews The output list of matching Views.
* @param searched The text to match against.
*
* @see #FIND_VIEWS_WITH_TEXT
* @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION
* @see #setContentDescription(CharSequence)
*/
public void findViewsWithText(ArrayList<View> outViews, CharSequence searched,
@FindViewFlags int flags) {
if (getAccessibilityNodeProvider() != null) {
if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) {
outViews.add(this);
}
} else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0
&& (searched != null && searched.length() > 0)
&& (mContentDescription != null && mContentDescription.length() > 0)) {
String searchedLowerCase = searched.toString().toLowerCase();
String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase();
if (contentDescriptionLowerCase.contains(searchedLowerCase)) {
outViews.add(this);
}
}
}
/**
* Find and return all touchable views that are descendants of this view,
* possibly including this view if it is touchable itself.
*
* @return A list of touchable views
*/
public ArrayList<View> getTouchables() {
ArrayList<View> result = new ArrayList<View>();
addTouchables(result);
return result;
}
/**
* Add any touchable views that are descendants of this view (possibly
* including this view if it is touchable itself) to views.
*
* @param views Touchable views found so far
*/
public void addTouchables(ArrayList<View> views) {
final int viewFlags = mViewFlags;
if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE
|| (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE)
&& (viewFlags & ENABLED_MASK) == ENABLED) {
views.add(this);
}
}
/**
* Returns whether this View is accessibility focused.
*
* @return True if this View is accessibility focused.
*/
public boolean isAccessibilityFocused() {
return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0;
}
/**
* Call this to try to give accessibility focus to this view.
*
* A view will not actually take focus if {@link AccessibilityManager#isEnabled()}
* returns false or the view is no visible or the view already has accessibility
* focus.
*
* See also {@link #focusSearch(int)}, which is what you call to say that you
* have focus, and you want your parent to look for the next one.
*
* @return Whether this view actually took accessibility focus.
*
* @hide
*/
public boolean requestAccessibilityFocus() {
AccessibilityManager manager = AccessibilityManager.getInstance(mContext);
if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) {
return false;
}
if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) {
return false;
}
if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) {
mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED;
ViewRootImpl viewRootImpl = getViewRootImpl();
if (viewRootImpl != null) {
viewRootImpl.setAccessibilityFocus(this, null);
}
invalidate();
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
return true;
}
return false;
}
/**
* Call this to try to clear accessibility focus of this view.
*
* See also {@link #focusSearch(int)}, which is what you call to say that you
* have focus, and you want your parent to look for the next one.
*
* @hide
*/
public void clearAccessibilityFocus() {
clearAccessibilityFocusNoCallbacks(0);
// Clear the global reference of accessibility focus if this view or
// any of its descendants had accessibility focus. This will NOT send
// an event or update internal state if focus is cleared from a
// descendant view, which may leave views in inconsistent states.
final ViewRootImpl viewRootImpl = getViewRootImpl();
if (viewRootImpl != null) {
final View focusHost = viewRootImpl.getAccessibilityFocusedHost();
if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) {
viewRootImpl.setAccessibilityFocus(null, null);
}
}
}
private void sendAccessibilityHoverEvent(int eventType) {
// Since we are not delivering to a client accessibility events from not
// important views (unless the clinet request that) we need to fire the
// event from the deepest view exposed to the client. As a consequence if
// the user crosses a not exposed view the client will see enter and exit
// of the exposed predecessor followed by and enter and exit of that same
// predecessor when entering and exiting the not exposed descendant. This
// is fine since the client has a clear idea which view is hovered at the
// price of a couple more events being sent. This is a simple and
// working solution.
View source = this;
while (true) {
if (source.includeForAccessibility()) {
source.sendAccessibilityEvent(eventType);
return;
}
ViewParent parent = source.getParent();
if (parent instanceof View) {
source = (View) parent;
} else {
return;
}
}
}
/**
* Clears accessibility focus without calling any callback methods
* normally invoked in {@link #clearAccessibilityFocus()}. This method
* is used separately from that one for clearing accessibility focus when
* giving this focus to another view.
*
* @param action The action, if any, that led to focus being cleared. Set to
* AccessibilityNodeInfo#ACTION_ACCESSIBILITY_FOCUS to specify that focus is moving within
* the window.
*/
void clearAccessibilityFocusNoCallbacks(int action) {
if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) {
mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED;
invalidate();
if (AccessibilityManager.getInstance(mContext).isEnabled()) {
AccessibilityEvent event = AccessibilityEvent.obtain(
AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
event.setAction(action);
if (mAccessibilityDelegate != null) {
mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event);
} else {
sendAccessibilityEventUnchecked(event);
}
}
}
}
/**
* Call this to try to give focus to a specific view or to one of its
* descendants.
*
* A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
* false), or if it is focusable and it is not focusable in touch mode
* ({@link #isFocusableInTouchMode}) while the device is in touch mode.
*
* See also {@link #focusSearch(int)}, which is what you call to say that you
* have focus, and you want your parent to look for the next one.
*
* This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments
* {@link #FOCUS_DOWN} and <code>null</code>.
*
* @return Whether this view or one of its descendants actually took focus.
*/
public final boolean requestFocus() {
return requestFocus(View.FOCUS_DOWN);
}
/**
* Call this to try to give focus to a specific view or to one of its
* descendants and give it a hint about what direction focus is heading.
*
* A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
* false), or if it is focusable and it is not focusable in touch mode
* ({@link #isFocusableInTouchMode}) while the device is in touch mode.
*
* See also {@link #focusSearch(int)}, which is what you call to say that you
* have focus, and you want your parent to look for the next one.
*
* This is equivalent to calling {@link #requestFocus(int, Rect)} with
* <code>null</code> set for the previously focused rectangle.
*
* @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
* @return Whether this view or one of its descendants actually took focus.
*/
public final boolean requestFocus(int direction) {
return requestFocus(direction, null);
}
/**
* Call this to try to give focus to a specific view or to one of its descendants
* and give it hints about the direction and a specific rectangle that the focus
* is coming from. The rectangle can help give larger views a finer grained hint
* about where focus is coming from, and therefore, where to show selection, or
* forward focus change internally.
*
* A view will not actually take focus if it is not focusable ({@link #isFocusable} returns
* false), or if it is focusable and it is not focusable in touch mode
* ({@link #isFocusableInTouchMode}) while the device is in touch mode.
*
* A View will not take focus if it is not visible.
*
* A View will not take focus if one of its parents has
* {@link android.view.ViewGroup#getDescendantFocusability()} equal to
* {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}.
*
* See also {@link #focusSearch(int)}, which is what you call to say that you
* have focus, and you want your parent to look for the next one.
*
* You may wish to override this method if your custom {@link View} has an internal
* {@link View} that it wishes to forward the request to.
*
* @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
* @param previouslyFocusedRect The rectangle (in this View's coordinate system)
* to give a finer grained hint about where focus is coming from. May be null
* if there is no hint.
* @return Whether this view or one of its descendants actually took focus.
*/
public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
return requestFocusNoSearch(direction, previouslyFocusedRect);
}
private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) {
// need to be focusable
if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE ||
(mViewFlags & VISIBILITY_MASK) != VISIBLE) {
return false;
}
// need to be focusable in touch mode if in touch mode
if (isInTouchMode() &&
(FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) {
return false;
}
// need to not have any parents blocking us
if (hasAncestorThatBlocksDescendantFocus()) {
return false;
}
handleFocusGainInternal(direction, previouslyFocusedRect);
return true;
}
/**
* Call this to try to give focus to a specific view or to one of its descendants. This is a
* special variant of {@link #requestFocus() } that will allow views that are not focusable in
* touch mode to request focus when they are touched.
*
* @return Whether this view or one of its descendants actually took focus.
*
* @see #isInTouchMode()
*
*/
public final boolean requestFocusFromTouch() {
// Leave touch mode if we need to
if (isInTouchMode()) {
ViewRootImpl viewRoot = getViewRootImpl();
if (viewRoot != null) {
viewRoot.ensureTouchMode(false);
}
}
return requestFocus(View.FOCUS_DOWN);
}
/**
* @return Whether any ancestor of this view blocks descendant focus.
*/
private boolean hasAncestorThatBlocksDescendantFocus() {
final boolean focusableInTouchMode = isFocusableInTouchMode();
ViewParent ancestor = mParent;
while (ancestor instanceof ViewGroup) {
final ViewGroup vgAncestor = (ViewGroup) ancestor;
if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS
|| (!focusableInTouchMode && vgAncestor.shouldBlockFocusForTouchscreen())) {
return true;
} else {
ancestor = vgAncestor.getParent();
}
}
return false;
}
/**
* Gets the mode for determining whether this View is important for accessibility
* which is if it fires accessibility events and if it is reported to
* accessibility services that query the screen.
*
* @return The mode for determining whether a View is important for accessibility.
*
* @attr ref android.R.styleable#View_importantForAccessibility
*
* @see #IMPORTANT_FOR_ACCESSIBILITY_YES
* @see #IMPORTANT_FOR_ACCESSIBILITY_NO
* @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
* @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO
*/
@ViewDebug.ExportedProperty(category = "accessibility", mapping = {
@ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"),
@ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"),
@ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no"),
@ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS,
to = "noHideDescendants")
})
public int getImportantForAccessibility() {
return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK)
>> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
}
/**
* Sets the live region mode for this view. This indicates to accessibility
* services whether they should automatically notify the user about changes
* to the view's content description or text, or to the content descriptions
* or text of the view's children (where applicable).
* <p>
* For example, in a login screen with a TextView that displays an "incorrect
* password" notification, that view should be marked as a live region with
* mode {@link #ACCESSIBILITY_LIVE_REGION_POLITE}.
* <p>
* To disable change notifications for this view, use
* {@link #ACCESSIBILITY_LIVE_REGION_NONE}. This is the default live region
* mode for most views.
* <p>
* To indicate that the user should be notified of changes, use
* {@link #ACCESSIBILITY_LIVE_REGION_POLITE}.
* <p>
* If the view's changes should interrupt ongoing speech and notify the user
* immediately, use {@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}.
*
* @param mode The live region mode for this view, one of:
* <ul>
* <li>{@link #ACCESSIBILITY_LIVE_REGION_NONE}
* <li>{@link #ACCESSIBILITY_LIVE_REGION_POLITE}
* <li>{@link #ACCESSIBILITY_LIVE_REGION_ASSERTIVE}
* </ul>
* @attr ref android.R.styleable#View_accessibilityLiveRegion
*/
public void setAccessibilityLiveRegion(int mode) {
if (mode != getAccessibilityLiveRegion()) {
mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK;
mPrivateFlags2 |= (mode << PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT)
& PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK;
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
}
/**
* Gets the live region mode for this View.
*
* @return The live region mode for the view.
*
* @attr ref android.R.styleable#View_accessibilityLiveRegion
*
* @see #setAccessibilityLiveRegion(int)
*/
public int getAccessibilityLiveRegion() {
return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_LIVE_REGION_MASK)
>> PFLAG2_ACCESSIBILITY_LIVE_REGION_SHIFT;
}
/**
* Sets how to determine whether this view is important for accessibility
* which is if it fires accessibility events and if it is reported to
* accessibility services that query the screen.
*
* @param mode How to determine whether this view is important for accessibility.
*
* @attr ref android.R.styleable#View_importantForAccessibility
*
* @see #IMPORTANT_FOR_ACCESSIBILITY_YES
* @see #IMPORTANT_FOR_ACCESSIBILITY_NO
* @see #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
* @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO
*/
public void setImportantForAccessibility(int mode) {
final int oldMode = getImportantForAccessibility();
if (mode != oldMode) {
final boolean hideDescendants =
mode == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
// If this node or its descendants are no longer important, try to
// clear accessibility focus.
if (mode == IMPORTANT_FOR_ACCESSIBILITY_NO || hideDescendants) {
final View focusHost = findAccessibilityFocusHost(hideDescendants);
if (focusHost != null) {
focusHost.clearAccessibilityFocus();
}
}
// If we're moving between AUTO and another state, we might not need
// to send a subtree changed notification. We'll store the computed
// importance, since we'll need to check it later to make sure.
final boolean maySkipNotify = oldMode == IMPORTANT_FOR_ACCESSIBILITY_AUTO
|| mode == IMPORTANT_FOR_ACCESSIBILITY_AUTO;
final boolean oldIncludeForAccessibility = maySkipNotify && includeForAccessibility();
mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK;
mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT)
& PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK;
if (!maySkipNotify || oldIncludeForAccessibility != includeForAccessibility()) {
notifySubtreeAccessibilityStateChangedIfNeeded();
} else {
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
}
}
/**
* Returns the view within this view's hierarchy that is hosting
* accessibility focus.
*
* @param searchDescendants whether to search for focus in descendant views
* @return the view hosting accessibility focus, or {@code null}
*/
private View findAccessibilityFocusHost(boolean searchDescendants) {
if (isAccessibilityFocusedViewOrHost()) {
return this;
}
if (searchDescendants) {
final ViewRootImpl viewRoot = getViewRootImpl();
if (viewRoot != null) {
final View focusHost = viewRoot.getAccessibilityFocusedHost();
if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) {
return focusHost;
}
}
}
return null;
}
/**
* Computes whether this view should be exposed for accessibility. In
* general, views that are interactive or provide information are exposed
* while views that serve only as containers are hidden.
* <p>
* If an ancestor of this view has importance
* {@link #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS}, this method
* returns <code>false</code>.
* <p>
* Otherwise, the value is computed according to the view's
* {@link #getImportantForAccessibility()} value:
* <ol>
* <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_NO} or
* {@link #IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS}, return <code>false
* </code>
* <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_YES}, return <code>true</code>
* <li>{@link #IMPORTANT_FOR_ACCESSIBILITY_AUTO}, return <code>true</code> if
* view satisfies any of the following:
* <ul>
* <li>Is actionable, e.g. {@link #isClickable()},
* {@link #isLongClickable()}, or {@link #isFocusable()}
* <li>Has an {@link AccessibilityDelegate}
* <li>Has an interaction listener, e.g. {@link OnTouchListener},
* {@link OnKeyListener}, etc.
* <li>Is an accessibility live region, e.g.
* {@link #getAccessibilityLiveRegion()} is not
* {@link #ACCESSIBILITY_LIVE_REGION_NONE}.
* </ul>
* </ol>
*
* @return Whether the view is exposed for accessibility.
* @see #setImportantForAccessibility(int)
* @see #getImportantForAccessibility()
*/
public boolean isImportantForAccessibility() {
final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK)
>> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT;
if (mode == IMPORTANT_FOR_ACCESSIBILITY_NO
|| mode == IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) {
return false;
}
// Check parent mode to ensure we're not hidden.
ViewParent parent = mParent;
while (parent instanceof View) {
if (((View) parent).getImportantForAccessibility()
== IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) {
return false;
}
parent = parent.getParent();
}
return mode == IMPORTANT_FOR_ACCESSIBILITY_YES || isActionableForAccessibility()
|| hasListenersForAccessibility() || getAccessibilityNodeProvider() != null
|| getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE;
}
/**
* Gets the parent for accessibility purposes. Note that the parent for
* accessibility is not necessary the immediate parent. It is the first
* predecessor that is important for accessibility.
*
* @return The parent for accessibility purposes.
*/
public ViewParent getParentForAccessibility() {
if (mParent instanceof View) {
View parentView = (View) mParent;
if (parentView.includeForAccessibility()) {
return mParent;
} else {
return mParent.getParentForAccessibility();
}
}
return null;
}
/**
* Adds the children of this View relevant for accessibility to the given list
* as output. Since some Views are not important for accessibility the added
* child views are not necessarily direct children of this view, rather they are
* the first level of descendants important for accessibility.
*
* @param outChildren The output list that will receive children for accessibility.
*/
public void addChildrenForAccessibility(ArrayList<View> outChildren) {
}
/**
* Whether to regard this view for accessibility. A view is regarded for
* accessibility if it is important for accessibility or the querying
* accessibility service has explicitly requested that view not
* important for accessibility are regarded.
*
* @return Whether to regard the view for accessibility.
*
* @hide
*/
public boolean includeForAccessibility() {
if (mAttachInfo != null) {
return (mAttachInfo.mAccessibilityFetchFlags
& AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0
|| isImportantForAccessibility();
}
return false;
}
/**
* Returns whether the View is considered actionable from
* accessibility perspective. Such view are important for
* accessibility.
*
* @return True if the view is actionable for accessibility.
*
* @hide
*/
public boolean isActionableForAccessibility() {
return (isClickable() || isLongClickable() || isFocusable());
}
/**
* Returns whether the View has registered callbacks which makes it
* important for accessibility.
*
* @return True if the view is actionable for accessibility.
*/
private boolean hasListenersForAccessibility() {
ListenerInfo info = getListenerInfo();
return mTouchDelegate != null || info.mOnKeyListener != null
|| info.mOnTouchListener != null || info.mOnGenericMotionListener != null
|| info.mOnHoverListener != null || info.mOnDragListener != null;
}
/**
* Notifies that the accessibility state of this view changed. The change
* is local to this view and does not represent structural changes such
* as children and parent. For example, the view became focusable. The
* notification is at at most once every
* {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}
* to avoid unnecessary load to the system. Also once a view has a pending
* notification this method is a NOP until the notification has been sent.
*
* @hide
*/
public void notifyViewAccessibilityStateChangedIfNeeded(int changeType) {
if (!AccessibilityManager.getInstance(mContext).isEnabled() || mAttachInfo == null) {
return;
}
if (mSendViewStateChangedAccessibilityEvent == null) {
mSendViewStateChangedAccessibilityEvent =
new SendViewStateChangedAccessibilityEvent();
}
mSendViewStateChangedAccessibilityEvent.runOrPost(changeType);
}
/**
* Notifies that the accessibility state of this view changed. The change
* is *not* local to this view and does represent structural changes such
* as children and parent. For example, the view size changed. The
* notification is at at most once every
* {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}
* to avoid unnecessary load to the system. Also once a view has a pending
* notification this method is a NOP until the notification has been sent.
*
* @hide
*/
public void notifySubtreeAccessibilityStateChangedIfNeeded() {
if (!AccessibilityManager.getInstance(mContext).isEnabled() || mAttachInfo == null) {
return;
}
if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) {
mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED;
if (mParent != null) {
try {
mParent.notifySubtreeAccessibilityStateChanged(
this, this, AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE);
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
}
}
}
}
/**
* Change the visibility of the View without triggering any other changes. This is
* important for transitions, where visibility changes should not adjust focus or
* trigger a new layout. This is only used when the visibility has already been changed
* and we need a transient value during an animation. When the animation completes,
* the original visibility value is always restored.
*
* @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
* @hide
*/
public void setTransitionVisibility(@Visibility int visibility) {
mViewFlags = (mViewFlags & ~View.VISIBILITY_MASK) | visibility;
}
/**
* Reset the flag indicating the accessibility state of the subtree rooted
* at this view changed.
*/
void resetSubtreeAccessibilityStateChanged() {
mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED;
}
/**
* Report an accessibility action to this view's parents for delegated processing.
*
* <p>Implementations of {@link #performAccessibilityAction(int, Bundle)} may internally
* call this method to delegate an accessibility action to a supporting parent. If the parent
* returns true from its
* {@link ViewParent#onNestedPrePerformAccessibilityAction(View, int, android.os.Bundle)}
* method this method will return true to signify that the action was consumed.</p>
*
* <p>This method is useful for implementing nested scrolling child views. If
* {@link #isNestedScrollingEnabled()} returns true and the action is a scrolling action
* a custom view implementation may invoke this method to allow a parent to consume the
* scroll first. If this method returns true the custom view should skip its own scrolling
* behavior.</p>
*
* @param action Accessibility action to delegate
* @param arguments Optional action arguments
* @return true if the action was consumed by a parent
*/
public boolean dispatchNestedPrePerformAccessibilityAction(int action, Bundle arguments) {
for (ViewParent p = getParent(); p != null; p = p.getParent()) {
if (p.onNestedPrePerformAccessibilityAction(this, action, arguments)) {
return true;
}
}
return false;
}
/**
* Performs the specified accessibility action on the view. For
* possible accessibility actions look at {@link AccessibilityNodeInfo}.
* <p>
* If an {@link AccessibilityDelegate} has been specified via calling
* {@link #setAccessibilityDelegate(AccessibilityDelegate)} its
* {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)}
* is responsible for handling this call.
* </p>
*
* <p>The default implementation will delegate
* {@link AccessibilityNodeInfo#ACTION_SCROLL_BACKWARD} and
* {@link AccessibilityNodeInfo#ACTION_SCROLL_FORWARD} to nested scrolling parents if
* {@link #isNestedScrollingEnabled() nested scrolling is enabled} on this view.</p>
*
* @param action The action to perform.
* @param arguments Optional action arguments.
* @return Whether the action was performed.
*/
public boolean performAccessibilityAction(int action, Bundle arguments) {
if (mAccessibilityDelegate != null) {
return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments);
} else {
return performAccessibilityActionInternal(action, arguments);
}
}
/**
* @see #performAccessibilityAction(int, Bundle)
*
* Note: Called from the default {@link AccessibilityDelegate}.
*
* @hide
*/
public boolean performAccessibilityActionInternal(int action, Bundle arguments) {
if (isNestedScrollingEnabled()
&& (action == AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD
|| action == AccessibilityNodeInfo.ACTION_SCROLL_FORWARD
|| action == R.id.accessibilityActionScrollUp
|| action == R.id.accessibilityActionScrollLeft
|| action == R.id.accessibilityActionScrollDown
|| action == R.id.accessibilityActionScrollRight)) {
if (dispatchNestedPrePerformAccessibilityAction(action, arguments)) {
return true;
}
}
switch (action) {
case AccessibilityNodeInfo.ACTION_CLICK: {
if (isClickable()) {
performClick();
return true;
}
} break;
case AccessibilityNodeInfo.ACTION_LONG_CLICK: {
if (isLongClickable()) {
performLongClick();
return true;
}
} break;
case AccessibilityNodeInfo.ACTION_FOCUS: {
if (!hasFocus()) {
// Get out of touch mode since accessibility
// wants to move focus around.
getViewRootImpl().ensureTouchMode(false);
return requestFocus();
}
} break;
case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: {
if (hasFocus()) {
clearFocus();
return !isFocused();
}
} break;
case AccessibilityNodeInfo.ACTION_SELECT: {
if (!isSelected()) {
setSelected(true);
return isSelected();
}
} break;
case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: {
if (isSelected()) {
setSelected(false);
return !isSelected();
}
} break;
case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
if (!isAccessibilityFocused()) {
return requestAccessibilityFocus();
}
} break;
case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: {
if (isAccessibilityFocused()) {
clearAccessibilityFocus();
return true;
}
} break;
case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: {
if (arguments != null) {
final int granularity = arguments.getInt(
AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
final boolean extendSelection = arguments.getBoolean(
AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN);
return traverseAtGranularity(granularity, true, extendSelection);
}
} break;
case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: {
if (arguments != null) {
final int granularity = arguments.getInt(
AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
final boolean extendSelection = arguments.getBoolean(
AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN);
return traverseAtGranularity(granularity, false, extendSelection);
}
} break;
case AccessibilityNodeInfo.ACTION_SET_SELECTION: {
CharSequence text = getIterableTextForAccessibility();
if (text == null) {
return false;
}
final int start = (arguments != null) ? arguments.getInt(
AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1;
final int end = (arguments != null) ? arguments.getInt(
AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1;
// Only cursor position can be specified (selection length == 0)
if ((getAccessibilitySelectionStart() != start
|| getAccessibilitySelectionEnd() != end)
&& (start == end)) {
setAccessibilitySelection(start, end);
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
return true;
}
} break;
case R.id.accessibilityActionShowOnScreen: {
if (mAttachInfo != null) {
final Rect r = mAttachInfo.mTmpInvalRect;
getDrawingRect(r);
return requestRectangleOnScreen(r, true);
}
} break;
case R.id.accessibilityActionContextClick: {
if (isContextClickable()) {
performContextClick();
return true;
}
} break;
}
return false;
}
private boolean traverseAtGranularity(int granularity, boolean forward,
boolean extendSelection) {
CharSequence text = getIterableTextForAccessibility();
if (text == null || text.length() == 0) {
return false;
}
TextSegmentIterator iterator = getIteratorForGranularity(granularity);
if (iterator == null) {
return false;
}
int current = getAccessibilitySelectionEnd();
if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) {
current = forward ? 0 : text.length();
}
final int[] range = forward ? iterator.following(current) : iterator.preceding(current);
if (range == null) {
return false;
}
final int segmentStart = range[0];
final int segmentEnd = range[1];
int selectionStart;
int selectionEnd;
if (extendSelection && isAccessibilitySelectionExtendable()) {
selectionStart = getAccessibilitySelectionStart();
if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) {
selectionStart = forward ? segmentStart : segmentEnd;
}
selectionEnd = forward ? segmentEnd : segmentStart;
} else {
selectionStart = selectionEnd= forward ? segmentEnd : segmentStart;
}
setAccessibilitySelection(selectionStart, selectionEnd);
final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY
: AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY;
sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd);
return true;
}
/**
* Gets the text reported for accessibility purposes.
*
* @return The accessibility text.
*
* @hide
*/
public CharSequence getIterableTextForAccessibility() {
return getContentDescription();
}
/**
* Gets whether accessibility selection can be extended.
*
* @return If selection is extensible.
*
* @hide
*/
public boolean isAccessibilitySelectionExtendable() {
return false;
}
/**
* @hide
*/
public int getAccessibilitySelectionStart() {
return mAccessibilityCursorPosition;
}
/**
* @hide
*/
public int getAccessibilitySelectionEnd() {
return getAccessibilitySelectionStart();
}
/**
* @hide
*/
public void setAccessibilitySelection(int start, int end) {
if (start == end && end == mAccessibilityCursorPosition) {
return;
}
if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) {
mAccessibilityCursorPosition = start;
} else {
mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED;
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED);
}
private void sendViewTextTraversedAtGranularityEvent(int action, int granularity,
int fromIndex, int toIndex) {
if (mParent == null) {
return;
}
AccessibilityEvent event = AccessibilityEvent.obtain(
AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY);
onInitializeAccessibilityEvent(event);
onPopulateAccessibilityEvent(event);
event.setFromIndex(fromIndex);
event.setToIndex(toIndex);
event.setAction(action);
event.setMovementGranularity(granularity);
mParent.requestSendAccessibilityEvent(this, event);
}
/**
* @hide
*/
public TextSegmentIterator getIteratorForGranularity(int granularity) {
switch (granularity) {
case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: {
CharSequence text = getIterableTextForAccessibility();
if (text != null && text.length() > 0) {
CharacterTextSegmentIterator iterator =
CharacterTextSegmentIterator.getInstance(
mContext.getResources().getConfiguration().locale);
iterator.initialize(text.toString());
return iterator;
}
} break;
case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: {
CharSequence text = getIterableTextForAccessibility();
if (text != null && text.length() > 0) {
WordTextSegmentIterator iterator =
WordTextSegmentIterator.getInstance(
mContext.getResources().getConfiguration().locale);
iterator.initialize(text.toString());
return iterator;
}
} break;
case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: {
CharSequence text = getIterableTextForAccessibility();
if (text != null && text.length() > 0) {
ParagraphTextSegmentIterator iterator =
ParagraphTextSegmentIterator.getInstance();
iterator.initialize(text.toString());
return iterator;
}
} break;
}
return null;
}
/**
* Tells whether the {@link View} is in the state between {@link #onStartTemporaryDetach()}
* and {@link #onFinishTemporaryDetach()}.
*
* <p>This method always returns {@code true} when called directly or indirectly from
* {@link #onStartTemporaryDetach()}. The return value when called directly or indirectly from
* {@link #onFinishTemporaryDetach()}, however, depends on the OS version.
* <ul>
* <li>{@code true} on {@link android.os.Build.VERSION_CODES#N API 24}</li>
* <li>{@code false} on {@link android.os.Build.VERSION_CODES#N_MR1 API 25}} and later</li>
* </ul>
* </p>
*
* @return {@code true} when the View is in the state between {@link #onStartTemporaryDetach()}
* and {@link #onFinishTemporaryDetach()}.
*/
public final boolean isTemporarilyDetached() {
return (mPrivateFlags3 & PFLAG3_TEMPORARY_DETACH) != 0;
}
/**
* Dispatch {@link #onStartTemporaryDetach()} to this View and its direct children if this is
* a container View.
*/
@CallSuper
public void dispatchStartTemporaryDetach() {
mPrivateFlags3 |= PFLAG3_TEMPORARY_DETACH;
onStartTemporaryDetach();
}
/**
* This is called when a container is going to temporarily detach a child, with
* {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}.
* It will either be followed by {@link #onFinishTemporaryDetach()} or
* {@link #onDetachedFromWindow()} when the container is done.
*/
public void onStartTemporaryDetach() {
removeUnsetPressCallback();
mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT;
}
/**
* Dispatch {@link #onFinishTemporaryDetach()} to this View and its direct children if this is
* a container View.
*/
@CallSuper
public void dispatchFinishTemporaryDetach() {
mPrivateFlags3 &= ~PFLAG3_TEMPORARY_DETACH;
onFinishTemporaryDetach();
if (hasWindowFocus() && hasFocus()) {
InputMethodManager.getInstance().focusIn(this);
}
}
/**
* Called after {@link #onStartTemporaryDetach} when the container is done
* changing the view.
*/
public void onFinishTemporaryDetach() {
}
/**
* Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState}
* for this view's window. Returns null if the view is not currently attached
* to the window. Normally you will not need to use this directly, but
* just use the standard high-level event callbacks like
* {@link #onKeyDown(int, KeyEvent)}.
*/
public KeyEvent.DispatcherState getKeyDispatcherState() {
return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null;
}
/**
* Dispatch a key event before it is processed by any input method
* associated with the view hierarchy. This can be used to intercept
* key events in special situations before the IME consumes them; a
* typical example would be handling the BACK key to update the application's
* UI instead of allowing the IME to see it and close itself.
*
* @param event The key event to be dispatched.
* @return True if the event was handled, false otherwise.
*/
public boolean dispatchKeyEventPreIme(KeyEvent event) {
return onKeyPreIme(event.getKeyCode(), event);
}
/**
* Dispatch a key event to the next view on the focus path. This path runs
* from the top of the view tree down to the currently focused view. If this
* view has focus, it will dispatch to itself. Otherwise it will dispatch
* the next node down the focus path. This method also fires any key
* listeners.
*
* @param event The key event to be dispatched.
* @return True if the event was handled, false otherwise.
*/
public boolean dispatchKeyEvent(KeyEvent event) {
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onKeyEvent(event, 0);
}
// Give any attached key listener a first crack at the event.
//noinspection SimplifiableIfStatement
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) {
return true;
}
if (event.dispatch(this, mAttachInfo != null
? mAttachInfo.mKeyDispatchState : null, this)) {
return true;
}
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
}
return false;
}
/**
* Dispatches a key shortcut event.
*
* @param event The key event to be dispatched.
* @return True if the event was handled by the view, false otherwise.
*/
public boolean dispatchKeyShortcutEvent(KeyEvent event) {
return onKeyShortcut(event.getKeyCode(), event);
}
/**
* Pass the touch screen motion event down to the target view, or this
* view if it is the target.
*
* @param event The motion event to be dispatched.
* @return True if the event was handled by the view, false otherwise.
*/
public boolean dispatchTouchEvent(MotionEvent event) {
// If the event should be handled by accessibility focus first.
if (event.isTargetAccessibilityFocus()) {
// We don't have focus or no virtual descendant has it, do not handle the event.
if (!isAccessibilityFocusedViewOrHost()) {
return false;
}
// We have focus and got the event, then use normal event dispatch.
event.setTargetAccessibilityFocus(false);
}
boolean result = false;
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onTouchEvent(event, 0);
}
final int actionMasked = event.getActionMasked();
if (actionMasked == MotionEvent.ACTION_DOWN) {
// Defensive cleanup for new gesture
stopNestedScroll();
}
if (onFilterTouchEventForSecurity(event)) {
if ((mViewFlags & ENABLED_MASK) == ENABLED && handleScrollBarDragging(event)) {
result = true;
}
//noinspection SimplifiableIfStatement
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnTouchListener != null
&& (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnTouchListener.onTouch(this, event)) {
result = true;
}
if (!result && onTouchEvent(event)) {
result = true;
}
}
if (!result && mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
}
// Clean up after nested scrolls if this is the end of a gesture;
// also cancel it if we tried an ACTION_DOWN but we didn't want the rest
// of the gesture.
if (actionMasked == MotionEvent.ACTION_UP ||
actionMasked == MotionEvent.ACTION_CANCEL ||
(actionMasked == MotionEvent.ACTION_DOWN && !result)) {
stopNestedScroll();
}
return result;
}
boolean isAccessibilityFocusedViewOrHost() {
return isAccessibilityFocused() || (getViewRootImpl() != null && getViewRootImpl()
.getAccessibilityFocusedHost() == this);
}
/**
* Filter the touch event to apply security policies.
*
* @param event The motion event to be filtered.
* @return True if the event should be dispatched, false if the event should be dropped.
*
* @see #getFilterTouchesWhenObscured
*/
public boolean onFilterTouchEventForSecurity(MotionEvent event) {
//noinspection RedundantIfStatement
if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0
&& (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) {
// Window is obscured, drop this touch.
return false;
}
return true;
}
/**
* Pass a trackball motion event down to the focused view.
*
* @param event The motion event to be dispatched.
* @return True if the event was handled by the view, false otherwise.
*/
public boolean dispatchTrackballEvent(MotionEvent event) {
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onTrackballEvent(event, 0);
}
return onTrackballEvent(event);
}
/**
* Dispatch a generic motion event.
* <p>
* Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
* are delivered to the view under the pointer. All other generic motion events are
* delivered to the focused view. Hover events are handled specially and are delivered
* to {@link #onHoverEvent(MotionEvent)}.
* </p>
*
* @param event The motion event to be dispatched.
* @return True if the event was handled by the view, false otherwise.
*/
public boolean dispatchGenericMotionEvent(MotionEvent event) {
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0);
}
final int source = event.getSource();
if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {
final int action = event.getAction();
if (action == MotionEvent.ACTION_HOVER_ENTER
|| action == MotionEvent.ACTION_HOVER_MOVE
|| action == MotionEvent.ACTION_HOVER_EXIT) {
if (dispatchHoverEvent(event)) {
return true;
}
} else if (dispatchGenericPointerEvent(event)) {
return true;
}
} else if (dispatchGenericFocusedEvent(event)) {
return true;
}
if (dispatchGenericMotionEventInternal(event)) {
return true;
}
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
}
return false;
}
private boolean dispatchGenericMotionEventInternal(MotionEvent event) {
//noinspection SimplifiableIfStatement
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnGenericMotionListener != null
&& (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnGenericMotionListener.onGenericMotion(this, event)) {
return true;
}
if (onGenericMotionEvent(event)) {
return true;
}
final int actionButton = event.getActionButton();
switch (event.getActionMasked()) {
case MotionEvent.ACTION_BUTTON_PRESS:
if (isContextClickable() && !mInContextButtonPress && !mHasPerformedLongPress
&& (actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY
|| actionButton == MotionEvent.BUTTON_SECONDARY)) {
if (performContextClick(event.getX(), event.getY())) {
mInContextButtonPress = true;
setPressed(true, event.getX(), event.getY());
removeTapCallback();
removeLongPressCallback();
return true;
}
}
break;
case MotionEvent.ACTION_BUTTON_RELEASE:
if (mInContextButtonPress && (actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY
|| actionButton == MotionEvent.BUTTON_SECONDARY)) {
mInContextButtonPress = false;
mIgnoreNextUpEvent = true;
}
break;
}
if (mInputEventConsistencyVerifier != null) {
mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);
}
return false;
}
/**
* Dispatch a hover event.
* <p>
* Do not call this method directly.
* Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
* </p>
*
* @param event The motion event to be dispatched.
* @return True if the event was handled by the view, false otherwise.
*/
protected boolean dispatchHoverEvent(MotionEvent event) {
ListenerInfo li = mListenerInfo;
//noinspection SimplifiableIfStatement
if (li != null && li.mOnHoverListener != null
&& (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnHoverListener.onHover(this, event)) {
return true;
}
return onHoverEvent(event);
}
/**
* Returns true if the view has a child to which it has recently sent
* {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and
* it does not have a hovered child, then it must be the innermost hovered view.
* @hide
*/
protected boolean hasHoveredChild() {
return false;
}
/**
* Dispatch a generic motion event to the view under the first pointer.
* <p>
* Do not call this method directly.
* Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
* </p>
*
* @param event The motion event to be dispatched.
* @return True if the event was handled by the view, false otherwise.
*/
protected boolean dispatchGenericPointerEvent(MotionEvent event) {
return false;
}
/**
* Dispatch a generic motion event to the currently focused view.
* <p>
* Do not call this method directly.
* Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead.
* </p>
*
* @param event The motion event to be dispatched.
* @return True if the event was handled by the view, false otherwise.
*/
protected boolean dispatchGenericFocusedEvent(MotionEvent event) {
return false;
}
/**
* Dispatch a pointer event.
* <p>
* Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all
* other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns
* reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches
* and should not be expected to handle other pointing device features.
* </p>
*
* @param event The motion event to be dispatched.
* @return True if the event was handled by the view, false otherwise.
* @hide
*/
public final boolean dispatchPointerEvent(MotionEvent event) {
if (event.isTouchEvent()) {
return dispatchTouchEvent(event);
} else {
return dispatchGenericMotionEvent(event);
}
}
/**
* Called when the window containing this view gains or loses window focus.
* ViewGroups should override to route to their children.
*
* @param hasFocus True if the window containing this view now has focus,
* false otherwise.
*/
public void dispatchWindowFocusChanged(boolean hasFocus) {
onWindowFocusChanged(hasFocus);
}
/**
* Called when the window containing this view gains or loses focus. Note
* that this is separate from view focus: to receive key events, both
* your view and its window must have focus. If a window is displayed
* on top of yours that takes input focus, then your own window will lose
* focus but the view focus will remain unchanged.
*
* @param hasWindowFocus True if the window containing this view now has
* focus, false otherwise.
*/
public void onWindowFocusChanged(boolean hasWindowFocus) {
InputMethodManager imm = InputMethodManager.peekInstance();
if (!hasWindowFocus) {
if (isPressed()) {
setPressed(false);
}
if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) {
imm.focusOut(this);
}
removeLongPressCallback();
removeTapCallback();
onFocusLost();
} else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) {
imm.focusIn(this);
}
refreshDrawableState();
}
/**
* Returns true if this view is in a window that currently has window focus.
* Note that this is not the same as the view itself having focus.
*
* @return True if this view is in a window that currently has window focus.
*/
public boolean hasWindowFocus() {
return mAttachInfo != null && mAttachInfo.mHasWindowFocus;
}
/**
* Dispatch a view visibility change down the view hierarchy.
* ViewGroups should override to route to their children.
* @param changedView The view whose visibility changed. Could be 'this' or
* an ancestor view.
* @param visibility The new visibility of changedView: {@link #VISIBLE},
* {@link #INVISIBLE} or {@link #GONE}.
*/
protected void dispatchVisibilityChanged(@NonNull View changedView,
@Visibility int visibility) {
onVisibilityChanged(changedView, visibility);
}
/**
* Called when the visibility of the view or an ancestor of the view has
* changed.
*
* @param changedView The view whose visibility changed. May be
* {@code this} or an ancestor view.
* @param visibility The new visibility, one of {@link #VISIBLE},
* {@link #INVISIBLE} or {@link #GONE}.
*/
protected void onVisibilityChanged(@NonNull View changedView, @Visibility int visibility) {
}
/**
* Dispatch a hint about whether this view is displayed. For instance, when
* a View moves out of the screen, it might receives a display hint indicating
* the view is not displayed. Applications should not <em>rely</em> on this hint
* as there is no guarantee that they will receive one.
*
* @param hint A hint about whether or not this view is displayed:
* {@link #VISIBLE} or {@link #INVISIBLE}.
*/
public void dispatchDisplayHint(@Visibility int hint) {
onDisplayHint(hint);
}
/**
* Gives this view a hint about whether is displayed or not. For instance, when
* a View moves out of the screen, it might receives a display hint indicating
* the view is not displayed. Applications should not <em>rely</em> on this hint
* as there is no guarantee that they will receive one.
*
* @param hint A hint about whether or not this view is displayed:
* {@link #VISIBLE} or {@link #INVISIBLE}.
*/
protected void onDisplayHint(@Visibility int hint) {
}
/**
* Dispatch a window visibility change down the view hierarchy.
* ViewGroups should override to route to their children.
*
* @param visibility The new visibility of the window.
*
* @see #onWindowVisibilityChanged(int)
*/
public void dispatchWindowVisibilityChanged(@Visibility int visibility) {
onWindowVisibilityChanged(visibility);
}
/**
* Called when the window containing has change its visibility
* (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note
* that this tells you whether or not your window is being made visible
* to the window manager; this does <em>not</em> tell you whether or not
* your window is obscured by other windows on the screen, even if it
* is itself visible.
*
* @param visibility The new visibility of the window.
*/
protected void onWindowVisibilityChanged(@Visibility int visibility) {
if (visibility == VISIBLE) {
initialAwakenScrollBars();
}
}
/**
* Internal dispatching method for {@link #onVisibilityAggregated}. Overridden by
* ViewGroup. Intended to only be called when {@link #isAttachedToWindow()},
* {@link #getWindowVisibility()} is {@link #VISIBLE} and this view's parent {@link #isShown()}.
*
* @param isVisible true if this view's visibility to the user is uninterrupted by its
* ancestors or by window visibility
* @return true if this view is visible to the user, not counting clipping or overlapping
*/
boolean dispatchVisibilityAggregated(boolean isVisible) {
final boolean thisVisible = getVisibility() == VISIBLE;
// If we're not visible but something is telling us we are, ignore it.
if (thisVisible || !isVisible) {
onVisibilityAggregated(isVisible);
}
return thisVisible && isVisible;
}
/**
* Called when the user-visibility of this View is potentially affected by a change
* to this view itself, an ancestor view or the window this view is attached to.
*
* @param isVisible true if this view and all of its ancestors are {@link #VISIBLE}
* and this view's window is also visible
*/
@CallSuper
public void onVisibilityAggregated(boolean isVisible) {
if (isVisible && mAttachInfo != null) {
initialAwakenScrollBars();
}
final Drawable dr = mBackground;
if (dr != null && isVisible != dr.isVisible()) {
dr.setVisible(isVisible, false);
}
final Drawable fg = mForegroundInfo != null ? mForegroundInfo.mDrawable : null;
if (fg != null && isVisible != fg.isVisible()) {
fg.setVisible(isVisible, false);
}
}
/**
* Returns the current visibility of the window this view is attached to
* (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}).
*
* @return Returns the current visibility of the view's window.
*/
@Visibility
public int getWindowVisibility() {
return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE;
}
/**
* Retrieve the overall visible display size in which the window this view is
* attached to has been positioned in. This takes into account screen
* decorations above the window, for both cases where the window itself
* is being position inside of them or the window is being placed under
* then and covered insets are used for the window to position its content
* inside. In effect, this tells you the available area where content can
* be placed and remain visible to users.
*
* <p>This function requires an IPC back to the window manager to retrieve
* the requested information, so should not be used in performance critical
* code like drawing.
*
* @param outRect Filled in with the visible display frame. If the view
* is not attached to a window, this is simply the raw display size.
*/
public void getWindowVisibleDisplayFrame(Rect outRect) {
if (mAttachInfo != null) {
try {
mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect);
} catch (RemoteException e) {
return;
}
// XXX This is really broken, and probably all needs to be done
// in the window manager, and we need to know more about whether
// we want the area behind or in front of the IME.
final Rect insets = mAttachInfo.mVisibleInsets;
outRect.left += insets.left;
outRect.top += insets.top;
outRect.right -= insets.right;
outRect.bottom -= insets.bottom;
return;
}
// The view is not attached to a display so we don't have a context.
// Make a best guess about the display size.
Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY);
d.getRectSize(outRect);
}
/**
* Like {@link #getWindowVisibleDisplayFrame}, but returns the "full" display frame this window
* is currently in without any insets.
*
* @hide
*/
public void getWindowDisplayFrame(Rect outRect) {
if (mAttachInfo != null) {
try {
mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect);
} catch (RemoteException e) {
return;
}
return;
}
// The view is not attached to a display so we don't have a context.
// Make a best guess about the display size.
Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY);
d.getRectSize(outRect);
}
/**
* Dispatch a notification about a resource configuration change down
* the view hierarchy.
* ViewGroups should override to route to their children.
*
* @param newConfig The new resource configuration.
*
* @see #onConfigurationChanged(android.content.res.Configuration)
*/
public void dispatchConfigurationChanged(Configuration newConfig) {
onConfigurationChanged(newConfig);
}
/**
* Called when the current configuration of the resources being used
* by the application have changed. You can use this to decide when
* to reload resources that can changed based on orientation and other
* configuration characteristics. You only need to use this if you are
* not relying on the normal {@link android.app.Activity} mechanism of
* recreating the activity instance upon a configuration change.
*
* @param newConfig The new resource configuration.
*/
protected void onConfigurationChanged(Configuration newConfig) {
}
/**
* Private function to aggregate all per-view attributes in to the view
* root.
*/
void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) {
performCollectViewAttributes(attachInfo, visibility);
}
void performCollectViewAttributes(AttachInfo attachInfo, int visibility) {
if ((visibility & VISIBILITY_MASK) == VISIBLE) {
if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) {
attachInfo.mKeepScreenOn = true;
}
attachInfo.mSystemUiVisibility |= mSystemUiVisibility;
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnSystemUiVisibilityChangeListener != null) {
attachInfo.mHasSystemUiListeners = true;
}
}
}
void needGlobalAttributesUpdate(boolean force) {
final AttachInfo ai = mAttachInfo;
if (ai != null && !ai.mRecomputeGlobalAttributes) {
if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0)
|| ai.mHasSystemUiListeners) {
ai.mRecomputeGlobalAttributes = true;
}
}
}
/**
* Returns whether the device is currently in touch mode. Touch mode is entered
* once the user begins interacting with the device by touch, and affects various
* things like whether focus is always visible to the user.
*
* @return Whether the device is in touch mode.
*/
@ViewDebug.ExportedProperty
public boolean isInTouchMode() {
if (mAttachInfo != null) {
return mAttachInfo.mInTouchMode;
} else {
return ViewRootImpl.isInTouchMode();
}
}
/**
* Returns the context the view is running in, through which it can
* access the current theme, resources, etc.
*
* @return The view's Context.
*/
@ViewDebug.CapturedViewProperty
public final Context getContext() {
return mContext;
}
/**
* Handle a key event before it is processed by any input method
* associated with the view hierarchy. This can be used to intercept
* key events in special situations before the IME consumes them; a
* typical example would be handling the BACK key to update the application's
* UI instead of allowing the IME to see it and close itself.
*
* @param keyCode The value in event.getKeyCode().
* @param event Description of the key event.
* @return If you handled the event, return true. If you want to allow the
* event to be handled by the next receiver, return false.
*/
public boolean onKeyPreIme(int keyCode, KeyEvent event) {
return false;
}
/**
* Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent)
* KeyEvent.Callback.onKeyDown()}: perform press of the view
* when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER}
* is released, if the view is enabled and clickable.
* <p>
* Key presses in software keyboards will generally NOT trigger this
* listener, although some may elect to do so in some situations. Do not
* rely on this to catch software key presses.
*
* @param keyCode a key code that represents the button pressed, from
* {@link android.view.KeyEvent}
* @param event the KeyEvent object that defines the button action
*/
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (KeyEvent.isConfirmKey(keyCode)) {
if ((mViewFlags & ENABLED_MASK) == DISABLED) {
return true;
}
// Long clickable items don't necessarily have to be clickable.
if (((mViewFlags & CLICKABLE) == CLICKABLE
|| (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
&& (event.getRepeatCount() == 0)) {
// For the purposes of menu anchoring and drawable hotspots,
// key events are considered to be at the center of the view.
final float x = getWidth() / 2f;
final float y = getHeight() / 2f;
setPressed(true, x, y);
checkForLongClick(0, x, y);
return true;
}
}
return false;
}
/**
* Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent)
* KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle
* the event).
* <p>Key presses in software keyboards will generally NOT trigger this listener,
* although some may elect to do so in some situations. Do not rely on this to
* catch software key presses.
*/
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
return false;
}
/**
* Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent)
* KeyEvent.Callback.onKeyUp()}: perform clicking of the view
* when {@link KeyEvent#KEYCODE_DPAD_CENTER}, {@link KeyEvent#KEYCODE_ENTER}
* or {@link KeyEvent#KEYCODE_SPACE} is released.
* <p>Key presses in software keyboards will generally NOT trigger this listener,
* although some may elect to do so in some situations. Do not rely on this to
* catch software key presses.
*
* @param keyCode A key code that represents the button pressed, from
* {@link android.view.KeyEvent}.
* @param event The KeyEvent object that defines the button action.
*/
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (KeyEvent.isConfirmKey(keyCode)) {
if ((mViewFlags & ENABLED_MASK) == DISABLED) {
return true;
}
if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) {
setPressed(false);
if (!mHasPerformedLongPress) {
// This is a tap, so remove the longpress check
removeLongPressCallback();
return performClick();
}
}
}
return false;
}
/**
* Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent)
* KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle
* the event).
* <p>Key presses in software keyboards will generally NOT trigger this listener,
* although some may elect to do so in some situations. Do not rely on this to
* catch software key presses.
*
* @param keyCode A key code that represents the button pressed, from
* {@link android.view.KeyEvent}.
* @param repeatCount The number of times the action was made.
* @param event The KeyEvent object that defines the button action.
*/
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
return false;
}
/**
* Called on the focused view when a key shortcut event is not handled.
* Override this method to implement local key shortcuts for the View.
* Key shortcuts can also be implemented by setting the
* {@link MenuItem#setShortcut(char, char) shortcut} property of menu items.
*
* @param keyCode The value in event.getKeyCode().
* @param event Description of the key event.
* @return If you handled the event, return true. If you want to allow the
* event to be handled by the next receiver, return false.
*/
public boolean onKeyShortcut(int keyCode, KeyEvent event) {
return false;
}
/**
* Check whether the called view is a text editor, in which case it
* would make sense to automatically display a soft input window for
* it. Subclasses should override this if they implement
* {@link #onCreateInputConnection(EditorInfo)} to return true if
* a call on that method would return a non-null InputConnection, and
* they are really a first-class editor that the user would normally
* start typing on when the go into a window containing your view.
*
* <p>The default implementation always returns false. This does
* <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)}
* will not be called or the user can not otherwise perform edits on your
* view; it is just a hint to the system that this is not the primary
* purpose of this view.
*
* @return Returns true if this view is a text editor, else false.
*/
public boolean onCheckIsTextEditor() {
return false;
}
/**
* Create a new InputConnection for an InputMethod to interact
* with the view. The default implementation returns null, since it doesn't
* support input methods. You can override this to implement such support.
* This is only needed for views that take focus and text input.
*
* <p>When implementing this, you probably also want to implement
* {@link #onCheckIsTextEditor()} to indicate you will return a
* non-null InputConnection.</p>
*
* <p>Also, take good care to fill in the {@link android.view.inputmethod.EditorInfo}
* object correctly and in its entirety, so that the connected IME can rely
* on its values. For example, {@link android.view.inputmethod.EditorInfo#initialSelStart}
* and {@link android.view.inputmethod.EditorInfo#initialSelEnd} members
* must be filled in with the correct cursor position for IMEs to work correctly
* with your application.</p>
*
* @param outAttrs Fill in with attribute information about the connection.
*/
public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
return null;
}
/**
* Called by the {@link android.view.inputmethod.InputMethodManager}
* when a view who is not the current
* input connection target is trying to make a call on the manager. The
* default implementation returns false; you can override this to return
* true for certain views if you are performing InputConnection proxying
* to them.
* @param view The View that is making the InputMethodManager call.
* @return Return true to allow the call, false to reject.
*/
public boolean checkInputConnectionProxy(View view) {
return false;
}
/**
* Show the context menu for this view. It is not safe to hold on to the
* menu after returning from this method.
*
* You should normally not overload this method. Overload
* {@link #onCreateContextMenu(ContextMenu)} or define an
* {@link OnCreateContextMenuListener} to add items to the context menu.
*
* @param menu The context menu to populate
*/
public void createContextMenu(ContextMenu menu) {
ContextMenuInfo menuInfo = getContextMenuInfo();
// Sets the current menu info so all items added to menu will have
// my extra info set.
((MenuBuilder)menu).setCurrentMenuInfo(menuInfo);
onCreateContextMenu(menu);
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnCreateContextMenuListener != null) {
li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo);
}
// Clear the extra information so subsequent items that aren't mine don't
// have my extra info.
((MenuBuilder)menu).setCurrentMenuInfo(null);
if (mParent != null) {
mParent.createContextMenu(menu);
}
}
/**
* Views should implement this if they have extra information to associate
* with the context menu. The return result is supplied as a parameter to
* the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)}
* callback.
*
* @return Extra information about the item for which the context menu
* should be shown. This information will vary across different
* subclasses of View.
*/
protected ContextMenuInfo getContextMenuInfo() {
return null;
}
/**
* Views should implement this if the view itself is going to add items to
* the context menu.
*
* @param menu the context menu to populate
*/
protected void onCreateContextMenu(ContextMenu menu) {
}
/**
* Implement this method to handle trackball motion events. The
* <em>relative</em> movement of the trackball since the last event
* can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and
* {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so
* that a movement of 1 corresponds to the user pressing one DPAD key (so
* they will often be fractional values, representing the more fine-grained
* movement information available from a trackball).
*
* @param event The motion event.
* @return True if the event was handled, false otherwise.
*/
public boolean onTrackballEvent(MotionEvent event) {
return false;
}
/**
* Implement this method to handle generic motion events.
* <p>
* Generic motion events describe joystick movements, mouse hovers, track pad
* touches, scroll wheel movements and other input events. The
* {@link MotionEvent#getSource() source} of the motion event specifies
* the class of input that was received. Implementations of this method
* must examine the bits in the source before processing the event.
* The following code example shows how this is done.
* </p><p>
* Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
* are delivered to the view under the pointer. All other generic motion events are
* delivered to the focused view.
* </p>
* <pre> public boolean onGenericMotionEvent(MotionEvent event) {
* if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) {
* if (event.getAction() == MotionEvent.ACTION_MOVE) {
* // process the joystick movement...
* return true;
* }
* }
* if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) {
* switch (event.getAction()) {
* case MotionEvent.ACTION_HOVER_MOVE:
* // process the mouse hover movement...
* return true;
* case MotionEvent.ACTION_SCROLL:
* // process the scroll wheel movement...
* return true;
* }
* }
* return super.onGenericMotionEvent(event);
* }</pre>
*
* @param event The generic motion event being processed.
* @return True if the event was handled, false otherwise.
*/
public boolean onGenericMotionEvent(MotionEvent event) {
return false;
}
/**
* Implement this method to handle hover events.
* <p>
* This method is called whenever a pointer is hovering into, over, or out of the
* bounds of a view and the view is not currently being touched.
* Hover events are represented as pointer events with action
* {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE},
* or {@link MotionEvent#ACTION_HOVER_EXIT}.
* </p>
* <ul>
* <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER}
* when the pointer enters the bounds of the view.</li>
* <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE}
* when the pointer has already entered the bounds of the view and has moved.</li>
* <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT}
* when the pointer has exited the bounds of the view or when the pointer is
* about to go down due to a button click, tap, or similar user action that
* causes the view to be touched.</li>
* </ul>
* <p>
* The view should implement this method to return true to indicate that it is
* handling the hover event, such as by changing its drawable state.
* </p><p>
* The default implementation calls {@link #setHovered} to update the hovered state
* of the view when a hover enter or hover exit event is received, if the view
* is enabled and is clickable. The default implementation also sends hover
* accessibility events.
* </p>
*
* @param event The motion event that describes the hover.
* @return True if the view handled the hover event.
*
* @see #isHovered
* @see #setHovered
* @see #onHoverChanged
*/
public boolean onHoverEvent(MotionEvent event) {
// The root view may receive hover (or touch) events that are outside the bounds of
// the window. This code ensures that we only send accessibility events for
// hovers that are actually within the bounds of the root view.
final int action = event.getActionMasked();
if (!mSendingHoverAccessibilityEvents) {
if ((action == MotionEvent.ACTION_HOVER_ENTER
|| action == MotionEvent.ACTION_HOVER_MOVE)
&& !hasHoveredChild()
&& pointInView(event.getX(), event.getY())) {
sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
mSendingHoverAccessibilityEvents = true;
}
} else {
if (action == MotionEvent.ACTION_HOVER_EXIT
|| (action == MotionEvent.ACTION_MOVE
&& !pointInView(event.getX(), event.getY()))) {
mSendingHoverAccessibilityEvents = false;
sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT);
}
}
if ((action == MotionEvent.ACTION_HOVER_ENTER || action == MotionEvent.ACTION_HOVER_MOVE)
&& event.isFromSource(InputDevice.SOURCE_MOUSE)
&& isOnScrollbar(event.getX(), event.getY())) {
awakenScrollBars();
}
if (isHoverable()) {
switch (action) {
case MotionEvent.ACTION_HOVER_ENTER:
setHovered(true);
break;
case MotionEvent.ACTION_HOVER_EXIT:
setHovered(false);
break;
}
// Dispatch the event to onGenericMotionEvent before returning true.
// This is to provide compatibility with existing applications that
// handled HOVER_MOVE events in onGenericMotionEvent and that would
// break because of the new default handling for hoverable views
// in onHoverEvent.
// Note that onGenericMotionEvent will be called by default when
// onHoverEvent returns false (refer to dispatchGenericMotionEvent).
dispatchGenericMotionEventInternal(event);
// The event was already handled by calling setHovered(), so always
// return true.
return true;
}
return false;
}
/**
* Returns true if the view should handle {@link #onHoverEvent}
* by calling {@link #setHovered} to change its hovered state.
*
* @return True if the view is hoverable.
*/
private boolean isHoverable() {
final int viewFlags = mViewFlags;
if ((viewFlags & ENABLED_MASK) == DISABLED) {
return false;
}
return (viewFlags & CLICKABLE) == CLICKABLE
|| (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE
|| (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE;
}
/**
* Returns true if the view is currently hovered.
*
* @return True if the view is currently hovered.
*
* @see #setHovered
* @see #onHoverChanged
*/
@ViewDebug.ExportedProperty
public boolean isHovered() {
return (mPrivateFlags & PFLAG_HOVERED) != 0;
}
/**
* Sets whether the view is currently hovered.
* <p>
* Calling this method also changes the drawable state of the view. This
* enables the view to react to hover by using different drawable resources
* to change its appearance.
* </p><p>
* The {@link #onHoverChanged} method is called when the hovered state changes.
* </p>
*
* @param hovered True if the view is hovered.
*
* @see #isHovered
* @see #onHoverChanged
*/
public void setHovered(boolean hovered) {
if (hovered) {
if ((mPrivateFlags & PFLAG_HOVERED) == 0) {
mPrivateFlags |= PFLAG_HOVERED;
refreshDrawableState();
onHoverChanged(true);
}
} else {
if ((mPrivateFlags & PFLAG_HOVERED) != 0) {
mPrivateFlags &= ~PFLAG_HOVERED;
refreshDrawableState();
onHoverChanged(false);
}
}
}
/**
* Implement this method to handle hover state changes.
* <p>
* This method is called whenever the hover state changes as a result of a
* call to {@link #setHovered}.
* </p>
*
* @param hovered The current hover state, as returned by {@link #isHovered}.
*
* @see #isHovered
* @see #setHovered
*/
public void onHoverChanged(boolean hovered) {
}
/**
* Handles scroll bar dragging by mouse input.
*
* @hide
* @param event The motion event.
*
* @return true if the event was handled as a scroll bar dragging, false otherwise.
*/
protected boolean handleScrollBarDragging(MotionEvent event) {
if (mScrollCache == null) {
return false;
}
final float x = event.getX();
final float y = event.getY();
final int action = event.getAction();
if ((mScrollCache.mScrollBarDraggingState == ScrollabilityCache.NOT_DRAGGING
&& action != MotionEvent.ACTION_DOWN)
|| !event.isFromSource(InputDevice.SOURCE_MOUSE)
|| !event.isButtonPressed(MotionEvent.BUTTON_PRIMARY)) {
mScrollCache.mScrollBarDraggingState = ScrollabilityCache.NOT_DRAGGING;
return false;
}
switch (action) {
case MotionEvent.ACTION_MOVE:
if (mScrollCache.mScrollBarDraggingState == ScrollabilityCache.NOT_DRAGGING) {
return false;
}
if (mScrollCache.mScrollBarDraggingState
== ScrollabilityCache.DRAGGING_VERTICAL_SCROLL_BAR) {
final Rect bounds = mScrollCache.mScrollBarBounds;
getVerticalScrollBarBounds(bounds);
final int range = computeVerticalScrollRange();
final int offset = computeVerticalScrollOffset();
final int extent = computeVerticalScrollExtent();
final int thumbLength = ScrollBarUtils.getThumbLength(
bounds.height(), bounds.width(), extent, range);
final int thumbOffset = ScrollBarUtils.getThumbOffset(
bounds.height(), thumbLength, extent, range, offset);
final float diff = y - mScrollCache.mScrollBarDraggingPos;
final float maxThumbOffset = bounds.height() - thumbLength;
final float newThumbOffset =
Math.min(Math.max(thumbOffset + diff, 0.0f), maxThumbOffset);
final int height = getHeight();
if (Math.round(newThumbOffset) != thumbOffset && maxThumbOffset > 0
&& height > 0 && extent > 0) {
final int newY = Math.round((range - extent)
/ ((float)extent / height) * (newThumbOffset / maxThumbOffset));
if (newY != getScrollY()) {
mScrollCache.mScrollBarDraggingPos = y;
setScrollY(newY);
}
}
return true;
}
if (mScrollCache.mScrollBarDraggingState
== ScrollabilityCache.DRAGGING_HORIZONTAL_SCROLL_BAR) {
final Rect bounds = mScrollCache.mScrollBarBounds;
getHorizontalScrollBarBounds(bounds);
final int range = computeHorizontalScrollRange();
final int offset = computeHorizontalScrollOffset();
final int extent = computeHorizontalScrollExtent();
final int thumbLength = ScrollBarUtils.getThumbLength(
bounds.width(), bounds.height(), extent, range);
final int thumbOffset = ScrollBarUtils.getThumbOffset(
bounds.width(), thumbLength, extent, range, offset);
final float diff = x - mScrollCache.mScrollBarDraggingPos;
final float maxThumbOffset = bounds.width() - thumbLength;
final float newThumbOffset =
Math.min(Math.max(thumbOffset + diff, 0.0f), maxThumbOffset);
final int width = getWidth();
if (Math.round(newThumbOffset) != thumbOffset && maxThumbOffset > 0
&& width > 0 && extent > 0) {
final int newX = Math.round((range - extent)
/ ((float)extent / width) * (newThumbOffset / maxThumbOffset));
if (newX != getScrollX()) {
mScrollCache.mScrollBarDraggingPos = x;
setScrollX(newX);
}
}
return true;
}
case MotionEvent.ACTION_DOWN:
if (mScrollCache.state == ScrollabilityCache.OFF) {
return false;
}
if (isOnVerticalScrollbarThumb(x, y)) {
mScrollCache.mScrollBarDraggingState =
ScrollabilityCache.DRAGGING_VERTICAL_SCROLL_BAR;
mScrollCache.mScrollBarDraggingPos = y;
return true;
}
if (isOnHorizontalScrollbarThumb(x, y)) {
mScrollCache.mScrollBarDraggingState =
ScrollabilityCache.DRAGGING_HORIZONTAL_SCROLL_BAR;
mScrollCache.mScrollBarDraggingPos = x;
return true;
}
}
mScrollCache.mScrollBarDraggingState = ScrollabilityCache.NOT_DRAGGING;
return false;
}
/**
* Implement this method to handle touch screen motion events.
* <p>
* If this method is used to detect click actions, it is recommended that
* the actions be performed by implementing and calling
* {@link #performClick()}. This will ensure consistent system behavior,
* including:
* <ul>
* <li>obeying click sound preferences
* <li>dispatching OnClickListener calls
* <li>handling {@link AccessibilityNodeInfo#ACTION_CLICK ACTION_CLICK} when
* accessibility features are enabled
* </ul>
*
* @param event The motion event.
* @return True if the event was handled, false otherwise.
*/
public boolean onTouchEvent(MotionEvent event) {
final float x = event.getX();
final float y = event.getY();
final int viewFlags = mViewFlags;
final int action = event.getAction();
if ((viewFlags & ENABLED_MASK) == DISABLED) {
if (action == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) {
setPressed(false);
}
// A disabled view that is clickable still consumes the touch
// events, it just doesn't respond to them.
return (((viewFlags & CLICKABLE) == CLICKABLE
|| (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
|| (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE);
}
if (mTouchDelegate != null) {
if (mTouchDelegate.onTouchEvent(event)) {
return true;
}
}
if (((viewFlags & CLICKABLE) == CLICKABLE ||
(viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) ||
(viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE) {
switch (action) {
case MotionEvent.ACTION_UP:
boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0;
if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) {
// take focus if we don't have it already and we should in
// touch mode.
boolean focusTaken = false;
if (isFocusable() && isFocusableInTouchMode() && !isFocused()) {
focusTaken = requestFocus();
}
if (prepressed) {
// The button is being released before we actually
// showed it as pressed. Make it show the pressed
// state now (before scheduling the click) to ensure
// the user sees it.
setPressed(true, x, y);
}
if (!mHasPerformedLongPress && !mIgnoreNextUpEvent) {
// This is a tap, so remove the longpress check
removeLongPressCallback();
// Only perform take click actions if we were in the pressed state
if (!focusTaken) {
// Use a Runnable and post this rather than calling
// performClick directly. This lets other visual state
// of the view update before click actions start.
if (mPerformClick == null) {
mPerformClick = new PerformClick();
}
if (!post(mPerformClick)) {
performClick();
}
}
}
if (mUnsetPressedState == null) {
mUnsetPressedState = new UnsetPressedState();
}
if (prepressed) {
postDelayed(mUnsetPressedState,
ViewConfiguration.getPressedStateDuration());
} else if (!post(mUnsetPressedState)) {
// If the post failed, unpress right now
mUnsetPressedState.run();
}
removeTapCallback();
}
mIgnoreNextUpEvent = false;
break;
case MotionEvent.ACTION_DOWN:
mHasPerformedLongPress = false;
if (performButtonActionOnTouchDown(event)) {
break;
}
// Walk up the hierarchy to determine if we're inside a scrolling container.
boolean isInScrollingContainer = isInScrollingContainer();
// For views inside a scrolling container, delay the pressed feedback for
// a short period in case this is a scroll.
if (isInScrollingContainer) {
mPrivateFlags |= PFLAG_PREPRESSED;
if (mPendingCheckForTap == null) {
mPendingCheckForTap = new CheckForTap();
}
mPendingCheckForTap.x = event.getX();
mPendingCheckForTap.y = event.getY();
postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
} else {
// Not inside a scrolling container, so show the feedback right away
setPressed(true, x, y);
checkForLongClick(0, x, y);
}
break;
case MotionEvent.ACTION_CANCEL:
setPressed(false);
removeTapCallback();
removeLongPressCallback();
mInContextButtonPress = false;
mHasPerformedLongPress = false;
mIgnoreNextUpEvent = false;
break;
case MotionEvent.ACTION_MOVE:
drawableHotspotChanged(x, y);
// Be lenient about moving outside of buttons
if (!pointInView(x, y, mTouchSlop)) {
// Outside button
removeTapCallback();
if ((mPrivateFlags & PFLAG_PRESSED) != 0) {
// Remove any future long press/tap checks
removeLongPressCallback();
setPressed(false);
}
}
break;
}
return true;
}
return false;
}
/**
* @hide
*/
public boolean isInScrollingContainer() {
ViewParent p = getParent();
while (p != null && p instanceof ViewGroup) {
if (((ViewGroup) p).shouldDelayChildPressedState()) {
return true;
}
p = p.getParent();
}
return false;
}
/**
* Remove the longpress detection timer.
*/
private void removeLongPressCallback() {
if (mPendingCheckForLongPress != null) {
removeCallbacks(mPendingCheckForLongPress);
}
}
/**
* Remove the pending click action
*/
private void removePerformClickCallback() {
if (mPerformClick != null) {
removeCallbacks(mPerformClick);
}
}
/**
* Remove the prepress detection timer.
*/
private void removeUnsetPressCallback() {
if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) {
setPressed(false);
removeCallbacks(mUnsetPressedState);
}
}
/**
* Remove the tap detection timer.
*/
private void removeTapCallback() {
if (mPendingCheckForTap != null) {
mPrivateFlags &= ~PFLAG_PREPRESSED;
removeCallbacks(mPendingCheckForTap);
}
}
/**
* Cancels a pending long press. Your subclass can use this if you
* want the context menu to come up if the user presses and holds
* at the same place, but you don't want it to come up if they press
* and then move around enough to cause scrolling.
*/
public void cancelLongPress() {
removeLongPressCallback();
/*
* The prepressed state handled by the tap callback is a display
* construct, but the tap callback will post a long press callback
* less its own timeout. Remove it here.
*/
removeTapCallback();
}
/**
* Remove the pending callback for sending a
* {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event.
*/
private void removeSendViewScrolledAccessibilityEventCallback() {
if (mSendViewScrolledAccessibilityEvent != null) {
removeCallbacks(mSendViewScrolledAccessibilityEvent);
mSendViewScrolledAccessibilityEvent.mIsPending = false;
}
}
/**
* Sets the TouchDelegate for this View.
*/
public void setTouchDelegate(TouchDelegate delegate) {
mTouchDelegate = delegate;
}
/**
* Gets the TouchDelegate for this View.
*/
public TouchDelegate getTouchDelegate() {
return mTouchDelegate;
}
/**
* Request unbuffered dispatch of the given stream of MotionEvents to this View.
*
* Until this View receives a corresponding {@link MotionEvent#ACTION_UP}, ask that the input
* system not batch {@link MotionEvent}s but instead deliver them as soon as they're
* available. This method should only be called for touch events.
*
* <p class="note">This api is not intended for most applications. Buffered dispatch
* provides many of benefits, and just requesting unbuffered dispatch on most MotionEvent
* streams will not improve your input latency. Side effects include: increased latency,
* jittery scrolls and inability to take advantage of system resampling. Talk to your input
* professional to see if {@link #requestUnbufferedDispatch(MotionEvent)} is right for
* you.</p>
*/
public final void requestUnbufferedDispatch(MotionEvent event) {
final int action = event.getAction();
if (mAttachInfo == null
|| action != MotionEvent.ACTION_DOWN && action != MotionEvent.ACTION_MOVE
|| !event.isTouchEvent()) {
return;
}
mAttachInfo.mUnbufferedDispatchRequested = true;
}
/**
* Set flags controlling behavior of this view.
*
* @param flags Constant indicating the value which should be set
* @param mask Constant indicating the bit range that should be changed
*/
void setFlags(int flags, int mask) {
final boolean accessibilityEnabled =
AccessibilityManager.getInstance(mContext).isEnabled();
final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility();
int old = mViewFlags;
mViewFlags = (mViewFlags & ~mask) | (flags & mask);
int changed = mViewFlags ^ old;
if (changed == 0) {
return;
}
int privateFlags = mPrivateFlags;
/* Check if the FOCUSABLE bit has changed */
if (((changed & FOCUSABLE_MASK) != 0) &&
((privateFlags & PFLAG_HAS_BOUNDS) !=0)) {
if (((old & FOCUSABLE_MASK) == FOCUSABLE)
&& ((privateFlags & PFLAG_FOCUSED) != 0)) {
/* Give up focus if we are no longer focusable */
clearFocus();
} else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE)
&& ((privateFlags & PFLAG_FOCUSED) == 0)) {
/*
* Tell the view system that we are now available to take focus
* if no one else already has it.
*/
if (mParent != null) mParent.focusableViewAvailable(this);
}
}
final int newVisibility = flags & VISIBILITY_MASK;
if (newVisibility == VISIBLE) {
if ((changed & VISIBILITY_MASK) != 0) {
/*
* If this view is becoming visible, invalidate it in case it changed while
* it was not visible. Marking it drawn ensures that the invalidation will
* go through.
*/
mPrivateFlags |= PFLAG_DRAWN;
invalidate(true);
needGlobalAttributesUpdate(true);
// a view becoming visible is worth notifying the parent
// about in case nothing has focus. even if this specific view
// isn't focusable, it may contain something that is, so let
// the root view try to give this focus if nothing else does.
if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) {
mParent.focusableViewAvailable(this);
}
}
}
/* Check if the GONE bit has changed */
if ((changed & GONE) != 0) {
needGlobalAttributesUpdate(false);
requestLayout();
if (((mViewFlags & VISIBILITY_MASK) == GONE)) {
if (hasFocus()) clearFocus();
clearAccessibilityFocus();
destroyDrawingCache();
if (mParent instanceof View) {
// GONE views noop invalidation, so invalidate the parent
((View) mParent).invalidate(true);
}
// Mark the view drawn to ensure that it gets invalidated properly the next
// time it is visible and gets invalidated
mPrivateFlags |= PFLAG_DRAWN;
}
if (mAttachInfo != null) {
mAttachInfo.mViewVisibilityChanged = true;
}
}
/* Check if the VISIBLE bit has changed */
if ((changed & INVISIBLE) != 0) {
needGlobalAttributesUpdate(false);
/*
* If this view is becoming invisible, set the DRAWN flag so that
* the next invalidate() will not be skipped.
*/
mPrivateFlags |= PFLAG_DRAWN;
if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE)) {
// root view becoming invisible shouldn't clear focus and accessibility focus
if (getRootView() != this) {
if (hasFocus()) clearFocus();
clearAccessibilityFocus();
}
}
if (mAttachInfo != null) {
mAttachInfo.mViewVisibilityChanged = true;
}
}
if ((changed & VISIBILITY_MASK) != 0) {
// If the view is invisible, cleanup its display list to free up resources
if (newVisibility != VISIBLE && mAttachInfo != null) {
cleanupDraw();
}
if (mParent instanceof ViewGroup) {
((ViewGroup) mParent).onChildVisibilityChanged(this,
(changed & VISIBILITY_MASK), newVisibility);
((View) mParent).invalidate(true);
} else if (mParent != null) {
mParent.invalidateChild(this, null);
}
if (mAttachInfo != null) {
dispatchVisibilityChanged(this, newVisibility);
// Aggregated visibility changes are dispatched to attached views
// in visible windows where the parent is currently shown/drawn
// or the parent is not a ViewGroup (and therefore assumed to be a ViewRoot),
// discounting clipping or overlapping. This makes it a good place
// to change animation states.
if (mParent != null && getWindowVisibility() == VISIBLE &&
((!(mParent instanceof ViewGroup)) || ((ViewGroup) mParent).isShown())) {
dispatchVisibilityAggregated(newVisibility == VISIBLE);
}
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
if ((changed & WILL_NOT_CACHE_DRAWING) != 0) {
destroyDrawingCache();
}
if ((changed & DRAWING_CACHE_ENABLED) != 0) {
destroyDrawingCache();
mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
invalidateParentCaches();
}
if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) {
destroyDrawingCache();
mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
}
if ((changed & DRAW_MASK) != 0) {
if ((mViewFlags & WILL_NOT_DRAW) != 0) {
if (mBackground != null
|| (mForegroundInfo != null && mForegroundInfo.mDrawable != null)) {
mPrivateFlags &= ~PFLAG_SKIP_DRAW;
} else {
mPrivateFlags |= PFLAG_SKIP_DRAW;
}
} else {
mPrivateFlags &= ~PFLAG_SKIP_DRAW;
}
requestLayout();
invalidate(true);
}
if ((changed & KEEP_SCREEN_ON) != 0) {
if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
mParent.recomputeViewAttributes(this);
}
}
if (accessibilityEnabled) {
if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0
|| (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0
|| (changed & CONTEXT_CLICKABLE) != 0) {
if (oldIncludeForAccessibility != includeForAccessibility()) {
notifySubtreeAccessibilityStateChangedIfNeeded();
} else {
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
} else if ((changed & ENABLED_MASK) != 0) {
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
}
}
/**
* Change the view's z order in the tree, so it's on top of other sibling
* views. This ordering change may affect layout, if the parent container
* uses an order-dependent layout scheme (e.g., LinearLayout). Prior
* to {@link android.os.Build.VERSION_CODES#KITKAT} this
* method should be followed by calls to {@link #requestLayout()} and
* {@link View#invalidate()} on the view's parent to force the parent to redraw
* with the new child ordering.
*
* @see ViewGroup#bringChildToFront(View)
*/
public void bringToFront() {
if (mParent != null) {
mParent.bringChildToFront(this);
}
}
/**
* This is called in response to an internal scroll in this view (i.e., the
* view scrolled its own contents). This is typically as a result of
* {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been
* called.
*
* @param l Current horizontal scroll origin.
* @param t Current vertical scroll origin.
* @param oldl Previous horizontal scroll origin.
* @param oldt Previous vertical scroll origin.
*/
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
notifySubtreeAccessibilityStateChangedIfNeeded();
if (AccessibilityManager.getInstance(mContext).isEnabled()) {
postSendViewScrolledAccessibilityEventCallback();
}
mBackgroundSizeChanged = true;
if (mForegroundInfo != null) {
mForegroundInfo.mBoundsChanged = true;
}
final AttachInfo ai = mAttachInfo;
if (ai != null) {
ai.mViewScrollChanged = true;
}
if (mListenerInfo != null && mListenerInfo.mOnScrollChangeListener != null) {
mListenerInfo.mOnScrollChangeListener.onScrollChange(this, l, t, oldl, oldt);
}
}
/**
* Interface definition for a callback to be invoked when the scroll
* X or Y positions of a view change.
* <p>
* <b>Note:</b> Some views handle scrolling independently from View and may
* have their own separate listeners for scroll-type events. For example,
* {@link android.widget.ListView ListView} allows clients to register an
* {@link android.widget.ListView#setOnScrollListener(android.widget.AbsListView.OnScrollListener) AbsListView.OnScrollListener}
* to listen for changes in list scroll position.
*
* @see #setOnScrollChangeListener(View.OnScrollChangeListener)
*/
public interface OnScrollChangeListener {
/**
* Called when the scroll position of a view changes.
*
* @param v The view whose scroll position has changed.
* @param scrollX Current horizontal scroll origin.
* @param scrollY Current vertical scroll origin.
* @param oldScrollX Previous horizontal scroll origin.
* @param oldScrollY Previous vertical scroll origin.
*/
void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY);
}
/**
* Interface definition for a callback to be invoked when the layout bounds of a view
* changes due to layout processing.
*/
public interface OnLayoutChangeListener {
/**
* Called when the layout bounds of a view changes due to layout processing.
*
* @param v The view whose bounds have changed.
* @param left The new value of the view's left property.
* @param top The new value of the view's top property.
* @param right The new value of the view's right property.
* @param bottom The new value of the view's bottom property.
* @param oldLeft The previous value of the view's left property.
* @param oldTop The previous value of the view's top property.
* @param oldRight The previous value of the view's right property.
* @param oldBottom The previous value of the view's bottom property.
*/
void onLayoutChange(View v, int left, int top, int right, int bottom,
int oldLeft, int oldTop, int oldRight, int oldBottom);
}
/**
* This is called during layout when the size of this view has changed. If
* you were just added to the view hierarchy, you're called with the old
* values of 0.
*
* @param w Current width of this view.
* @param h Current height of this view.
* @param oldw Old width of this view.
* @param oldh Old height of this view.
*/
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
}
/**
* Called by draw to draw the child views. This may be overridden
* by derived classes to gain control just before its children are drawn
* (but after its own view has been drawn).
* @param canvas the canvas on which to draw the view
*/
protected void dispatchDraw(Canvas canvas) {
}
/**
* Gets the parent of this view. Note that the parent is a
* ViewParent and not necessarily a View.
*
* @return Parent of this view.
*/
public final ViewParent getParent() {
return mParent;
}
/**
* Set the horizontal scrolled position of your view. This will cause a call to
* {@link #onScrollChanged(int, int, int, int)} and the view will be
* invalidated.
* @param value the x position to scroll to
*/
public void setScrollX(int value) {
scrollTo(value, mScrollY);
}
/**
* Set the vertical scrolled position of your view. This will cause a call to
* {@link #onScrollChanged(int, int, int, int)} and the view will be
* invalidated.
* @param value the y position to scroll to
*/
public void setScrollY(int value) {
scrollTo(mScrollX, value);
}
/**
* Return the scrolled left position of this view. This is the left edge of
* the displayed part of your view. You do not need to draw any pixels
* farther left, since those are outside of the frame of your view on
* screen.
*
* @return The left edge of the displayed part of your view, in pixels.
*/
public final int getScrollX() {
return mScrollX;
}
/**
* Return the scrolled top position of this view. This is the top edge of
* the displayed part of your view. You do not need to draw any pixels above
* it, since those are outside of the frame of your view on screen.
*
* @return The top edge of the displayed part of your view, in pixels.
*/
public final int getScrollY() {
return mScrollY;
}
/**
* Return the width of the your view.
*
* @return The width of your view, in pixels.
*/
@ViewDebug.ExportedProperty(category = "layout")
public final int getWidth() {
return mRight - mLeft;
}
/**
* Return the height of your view.
*
* @return The height of your view, in pixels.
*/
@ViewDebug.ExportedProperty(category = "layout")
public final int getHeight() {
return mBottom - mTop;
}
/**
* Return the visible drawing bounds of your view. Fills in the output
* rectangle with the values from getScrollX(), getScrollY(),
* getWidth(), and getHeight(). These bounds do not account for any
* transformation properties currently set on the view, such as
* {@link #setScaleX(float)} or {@link #setRotation(float)}.
*
* @param outRect The (scrolled) drawing bounds of the view.
*/
public void getDrawingRect(Rect outRect) {
outRect.left = mScrollX;
outRect.top = mScrollY;
outRect.right = mScrollX + (mRight - mLeft);
outRect.bottom = mScrollY + (mBottom - mTop);
}
/**
* Like {@link #getMeasuredWidthAndState()}, but only returns the
* raw width component (that is the result is masked by
* {@link #MEASURED_SIZE_MASK}).
*
* @return The raw measured width of this view.
*/
public final int getMeasuredWidth() {
return mMeasuredWidth & MEASURED_SIZE_MASK;
}
/**
* Return the full width measurement information for this view as computed
* by the most recent call to {@link #measure(int, int)}. This result is a bit mask
* as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
* This should be used during measurement and layout calculations only. Use
* {@link #getWidth()} to see how wide a view is after layout.
*
* @return The measured width of this view as a bit mask.
*/
@ViewDebug.ExportedProperty(category = "measurement", flagMapping = {
@ViewDebug.FlagToString(mask = MEASURED_STATE_MASK, equals = MEASURED_STATE_TOO_SMALL,
name = "MEASURED_STATE_TOO_SMALL"),
})
public final int getMeasuredWidthAndState() {
return mMeasuredWidth;
}
/**
* Like {@link #getMeasuredHeightAndState()}, but only returns the
* raw height component (that is the result is masked by
* {@link #MEASURED_SIZE_MASK}).
*
* @return The raw measured height of this view.
*/
public final int getMeasuredHeight() {
return mMeasuredHeight & MEASURED_SIZE_MASK;
}
/**
* Return the full height measurement information for this view as computed
* by the most recent call to {@link #measure(int, int)}. This result is a bit mask
* as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
* This should be used during measurement and layout calculations only. Use
* {@link #getHeight()} to see how wide a view is after layout.
*
* @return The measured height of this view as a bit mask.
*/
@ViewDebug.ExportedProperty(category = "measurement", flagMapping = {
@ViewDebug.FlagToString(mask = MEASURED_STATE_MASK, equals = MEASURED_STATE_TOO_SMALL,
name = "MEASURED_STATE_TOO_SMALL"),
})
public final int getMeasuredHeightAndState() {
return mMeasuredHeight;
}
/**
* Return only the state bits of {@link #getMeasuredWidthAndState()}
* and {@link #getMeasuredHeightAndState()}, combined into one integer.
* The width component is in the regular bits {@link #MEASURED_STATE_MASK}
* and the height component is at the shifted bits
* {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}.
*/
public final int getMeasuredState() {
return (mMeasuredWidth&MEASURED_STATE_MASK)
| ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT)
& (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT));
}
/**
* The transform matrix of this view, which is calculated based on the current
* rotation, scale, and pivot properties.
*
* @see #getRotation()
* @see #getScaleX()
* @see #getScaleY()
* @see #getPivotX()
* @see #getPivotY()
* @return The current transform matrix for the view
*/
public Matrix getMatrix() {
ensureTransformationInfo();
final Matrix matrix = mTransformationInfo.mMatrix;
mRenderNode.getMatrix(matrix);
return matrix;
}
/**
* Returns true if the transform matrix is the identity matrix.
* Recomputes the matrix if necessary.
*
* @return True if the transform matrix is the identity matrix, false otherwise.
*/
final boolean hasIdentityMatrix() {
return mRenderNode.hasIdentityMatrix();
}
void ensureTransformationInfo() {
if (mTransformationInfo == null) {
mTransformationInfo = new TransformationInfo();
}
}
/**
* Utility method to retrieve the inverse of the current mMatrix property.
* We cache the matrix to avoid recalculating it when transform properties
* have not changed.
*
* @return The inverse of the current matrix of this view.
* @hide
*/
public final Matrix getInverseMatrix() {
ensureTransformationInfo();
if (mTransformationInfo.mInverseMatrix == null) {
mTransformationInfo.mInverseMatrix = new Matrix();
}
final Matrix matrix = mTransformationInfo.mInverseMatrix;
mRenderNode.getInverseMatrix(matrix);
return matrix;
}
/**
* Gets the distance along the Z axis from the camera to this view.
*
* @see #setCameraDistance(float)
*
* @return The distance along the Z axis.
*/
public float getCameraDistance() {
final float dpi = mResources.getDisplayMetrics().densityDpi;
return -(mRenderNode.getCameraDistance() * dpi);
}
/**
* <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which
* views are drawn) from the camera to this view. The camera's distance
* affects 3D transformations, for instance rotations around the X and Y
* axis. If the rotationX or rotationY properties are changed and this view is
* large (more than half the size of the screen), it is recommended to always
* use a camera distance that's greater than the height (X axis rotation) or
* the width (Y axis rotation) of this view.</p>
*
* <p>The distance of the camera from the view plane can have an affect on the
* perspective distortion of the view when it is rotated around the x or y axis.
* For example, a large distance will result in a large viewing angle, and there
* will not be much perspective distortion of the view as it rotates. A short
* distance may cause much more perspective distortion upon rotation, and can
* also result in some drawing artifacts if the rotated view ends up partially
* behind the camera (which is why the recommendation is to use a distance at
* least as far as the size of the view, if the view is to be rotated.)</p>
*
* <p>The distance is expressed in "depth pixels." The default distance depends
* on the screen density. For instance, on a medium density display, the
* default distance is 1280. On a high density display, the default distance
* is 1920.</p>
*
* <p>If you want to specify a distance that leads to visually consistent
* results across various densities, use the following formula:</p>
* <pre>
* float scale = context.getResources().getDisplayMetrics().density;
* view.setCameraDistance(distance * scale);
* </pre>
*
* <p>The density scale factor of a high density display is 1.5,
* and 1920 = 1280 * 1.5.</p>
*
* @param distance The distance in "depth pixels", if negative the opposite
* value is used
*
* @see #setRotationX(float)
* @see #setRotationY(float)
*/
public void setCameraDistance(float distance) {
final float dpi = mResources.getDisplayMetrics().densityDpi;
invalidateViewProperty(true, false);
mRenderNode.setCameraDistance(-Math.abs(distance) / dpi);
invalidateViewProperty(false, false);
invalidateParentIfNeededAndWasQuickRejected();
}
/**
* The degrees that the view is rotated around the pivot point.
*
* @see #setRotation(float)
* @see #getPivotX()
* @see #getPivotY()
*
* @return The degrees of rotation.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getRotation() {
return mRenderNode.getRotation();
}
/**
* Sets the degrees that the view is rotated around the pivot point. Increasing values
* result in clockwise rotation.
*
* @param rotation The degrees of rotation.
*
* @see #getRotation()
* @see #getPivotX()
* @see #getPivotY()
* @see #setRotationX(float)
* @see #setRotationY(float)
*
* @attr ref android.R.styleable#View_rotation
*/
public void setRotation(float rotation) {
if (rotation != getRotation()) {
// Double-invalidation is necessary to capture view's old and new areas
invalidateViewProperty(true, false);
mRenderNode.setRotation(rotation);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* The degrees that the view is rotated around the vertical axis through the pivot point.
*
* @see #getPivotX()
* @see #getPivotY()
* @see #setRotationY(float)
*
* @return The degrees of Y rotation.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getRotationY() {
return mRenderNode.getRotationY();
}
/**
* Sets the degrees that the view is rotated around the vertical axis through the pivot point.
* Increasing values result in counter-clockwise rotation from the viewpoint of looking
* down the y axis.
*
* When rotating large views, it is recommended to adjust the camera distance
* accordingly. Refer to {@link #setCameraDistance(float)} for more information.
*
* @param rotationY The degrees of Y rotation.
*
* @see #getRotationY()
* @see #getPivotX()
* @see #getPivotY()
* @see #setRotation(float)
* @see #setRotationX(float)
* @see #setCameraDistance(float)
*
* @attr ref android.R.styleable#View_rotationY
*/
public void setRotationY(float rotationY) {
if (rotationY != getRotationY()) {
invalidateViewProperty(true, false);
mRenderNode.setRotationY(rotationY);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* The degrees that the view is rotated around the horizontal axis through the pivot point.
*
* @see #getPivotX()
* @see #getPivotY()
* @see #setRotationX(float)
*
* @return The degrees of X rotation.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getRotationX() {
return mRenderNode.getRotationX();
}
/**
* Sets the degrees that the view is rotated around the horizontal axis through the pivot point.
* Increasing values result in clockwise rotation from the viewpoint of looking down the
* x axis.
*
* When rotating large views, it is recommended to adjust the camera distance
* accordingly. Refer to {@link #setCameraDistance(float)} for more information.
*
* @param rotationX The degrees of X rotation.
*
* @see #getRotationX()
* @see #getPivotX()
* @see #getPivotY()
* @see #setRotation(float)
* @see #setRotationY(float)
* @see #setCameraDistance(float)
*
* @attr ref android.R.styleable#View_rotationX
*/
public void setRotationX(float rotationX) {
if (rotationX != getRotationX()) {
invalidateViewProperty(true, false);
mRenderNode.setRotationX(rotationX);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* The amount that the view is scaled in x around the pivot point, as a proportion of
* the view's unscaled width. A value of 1, the default, means that no scaling is applied.
*
* <p>By default, this is 1.0f.
*
* @see #getPivotX()
* @see #getPivotY()
* @return The scaling factor.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getScaleX() {
return mRenderNode.getScaleX();
}
/**
* Sets the amount that the view is scaled in x around the pivot point, as a proportion of
* the view's unscaled width. A value of 1 means that no scaling is applied.
*
* @param scaleX The scaling factor.
* @see #getPivotX()
* @see #getPivotY()
*
* @attr ref android.R.styleable#View_scaleX
*/
public void setScaleX(float scaleX) {
if (scaleX != getScaleX()) {
invalidateViewProperty(true, false);
mRenderNode.setScaleX(scaleX);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* The amount that the view is scaled in y around the pivot point, as a proportion of
* the view's unscaled height. A value of 1, the default, means that no scaling is applied.
*
* <p>By default, this is 1.0f.
*
* @see #getPivotX()
* @see #getPivotY()
* @return The scaling factor.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getScaleY() {
return mRenderNode.getScaleY();
}
/**
* Sets the amount that the view is scaled in Y around the pivot point, as a proportion of
* the view's unscaled width. A value of 1 means that no scaling is applied.
*
* @param scaleY The scaling factor.
* @see #getPivotX()
* @see #getPivotY()
*
* @attr ref android.R.styleable#View_scaleY
*/
public void setScaleY(float scaleY) {
if (scaleY != getScaleY()) {
invalidateViewProperty(true, false);
mRenderNode.setScaleY(scaleY);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* The x location of the point around which the view is {@link #setRotation(float) rotated}
* and {@link #setScaleX(float) scaled}.
*
* @see #getRotation()
* @see #getScaleX()
* @see #getScaleY()
* @see #getPivotY()
* @return The x location of the pivot point.
*
* @attr ref android.R.styleable#View_transformPivotX
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getPivotX() {
return mRenderNode.getPivotX();
}
/**
* Sets the x location of the point around which the view is
* {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}.
* By default, the pivot point is centered on the object.
* Setting this property disables this behavior and causes the view to use only the
* explicitly set pivotX and pivotY values.
*
* @param pivotX The x location of the pivot point.
* @see #getRotation()
* @see #getScaleX()
* @see #getScaleY()
* @see #getPivotY()
*
* @attr ref android.R.styleable#View_transformPivotX
*/
public void setPivotX(float pivotX) {
if (!mRenderNode.isPivotExplicitlySet() || pivotX != getPivotX()) {
invalidateViewProperty(true, false);
mRenderNode.setPivotX(pivotX);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
}
}
/**
* The y location of the point around which the view is {@link #setRotation(float) rotated}
* and {@link #setScaleY(float) scaled}.
*
* @see #getRotation()
* @see #getScaleX()
* @see #getScaleY()
* @see #getPivotY()
* @return The y location of the pivot point.
*
* @attr ref android.R.styleable#View_transformPivotY
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getPivotY() {
return mRenderNode.getPivotY();
}
/**
* Sets the y location of the point around which the view is {@link #setRotation(float) rotated}
* and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object.
* Setting this property disables this behavior and causes the view to use only the
* explicitly set pivotX and pivotY values.
*
* @param pivotY The y location of the pivot point.
* @see #getRotation()
* @see #getScaleX()
* @see #getScaleY()
* @see #getPivotY()
*
* @attr ref android.R.styleable#View_transformPivotY
*/
public void setPivotY(float pivotY) {
if (!mRenderNode.isPivotExplicitlySet() || pivotY != getPivotY()) {
invalidateViewProperty(true, false);
mRenderNode.setPivotY(pivotY);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
}
}
/**
* The opacity of the view. This is a value from 0 to 1, where 0 means the view is
* completely transparent and 1 means the view is completely opaque.
*
* <p>By default this is 1.0f.
* @return The opacity of the view.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getAlpha() {
return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1;
}
/**
* Sets the behavior for overlapping rendering for this view (see {@link
* #hasOverlappingRendering()} for more details on this behavior). Calling this method
* is an alternative to overriding {@link #hasOverlappingRendering()} in a subclass,
* providing the value which is then used internally. That is, when {@link
* #forceHasOverlappingRendering(boolean)} is called, the value of {@link
* #hasOverlappingRendering()} is ignored and the value passed into this method is used
* instead.
*
* @param hasOverlappingRendering The value for overlapping rendering to be used internally
* instead of that returned by {@link #hasOverlappingRendering()}.
*
* @attr ref android.R.styleable#View_forceHasOverlappingRendering
*/
public void forceHasOverlappingRendering(boolean hasOverlappingRendering) {
mPrivateFlags3 |= PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED;
if (hasOverlappingRendering) {
mPrivateFlags3 |= PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE;
} else {
mPrivateFlags3 &= ~PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE;
}
}
/**
* Returns the value for overlapping rendering that is used internally. This is either
* the value passed into {@link #forceHasOverlappingRendering(boolean)}, if called, or
* the return value of {@link #hasOverlappingRendering()}, otherwise.
*
* @return The value for overlapping rendering being used internally.
*/
public final boolean getHasOverlappingRendering() {
return (mPrivateFlags3 & PFLAG3_HAS_OVERLAPPING_RENDERING_FORCED) != 0 ?
(mPrivateFlags3 & PFLAG3_OVERLAPPING_RENDERING_FORCED_VALUE) != 0 :
hasOverlappingRendering();
}
/**
* Returns whether this View has content which overlaps.
*
* <p>This function, intended to be overridden by specific View types, is an optimization when
* alpha is set on a view. If rendering overlaps in a view with alpha < 1, that view is drawn to
* an offscreen buffer and then composited into place, which can be expensive. If the view has
* no overlapping rendering, the view can draw each primitive with the appropriate alpha value
* directly. An example of overlapping rendering is a TextView with a background image, such as
* a Button. An example of non-overlapping rendering is a TextView with no background, or an
* ImageView with only the foreground image. The default implementation returns true; subclasses
* should override if they have cases which can be optimized.</p>
*
* <p>The current implementation of the saveLayer and saveLayerAlpha methods in {@link Canvas}
* necessitates that a View return true if it uses the methods internally without passing the
* {@link Canvas#CLIP_TO_LAYER_SAVE_FLAG}.</p>
*
* <p><strong>Note:</strong> The return value of this method is ignored if {@link
* #forceHasOverlappingRendering(boolean)} has been called on this view.</p>
*
* @return true if the content in this view might overlap, false otherwise.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public boolean hasOverlappingRendering() {
return true;
}
/**
* Sets the opacity of the view to a value from 0 to 1, where 0 means the view is
* completely transparent and 1 means the view is completely opaque.
*
* <p class="note"><strong>Note:</strong> setting alpha to a translucent value (0 < alpha < 1)
* can have significant performance implications, especially for large views. It is best to use
* the alpha property sparingly and transiently, as in the case of fading animations.</p>
*
* <p>For a view with a frequently changing alpha, such as during a fading animation, it is
* strongly recommended for performance reasons to either override
* {@link #hasOverlappingRendering()} to return <code>false</code> if appropriate, or setting a
* {@link #setLayerType(int, android.graphics.Paint) layer type} on the view for the duration
* of the animation. On versions {@link android.os.Build.VERSION_CODES#M} and below,
* the default path for rendering an unlayered View with alpha could add multiple milliseconds
* of rendering cost, even for simple or small views. Starting with
* {@link android.os.Build.VERSION_CODES#M}, {@link #LAYER_TYPE_HARDWARE} is automatically
* applied to the view at the rendering level.</p>
*
* <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is
* responsible for applying the opacity itself.</p>
*
* <p>On versions {@link android.os.Build.VERSION_CODES#LOLLIPOP_MR1} and below, note that if
* the view is backed by a {@link #setLayerType(int, android.graphics.Paint) layer} and is
* associated with a {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an
* alpha value less than 1.0 will supersede the alpha of the layer paint.</p>
*
* <p>Starting with {@link android.os.Build.VERSION_CODES#M}, setting a translucent alpha
* value will clip a View to its bounds, unless the View returns <code>false</code> from
* {@link #hasOverlappingRendering}.</p>
*
* @param alpha The opacity of the view.
*
* @see #hasOverlappingRendering()
* @see #setLayerType(int, android.graphics.Paint)
*
* @attr ref android.R.styleable#View_alpha
*/
public void setAlpha(@FloatRange(from=0.0, to=1.0) float alpha) {
ensureTransformationInfo();
if (mTransformationInfo.mAlpha != alpha) {
// Report visibility changes, which can affect children, to accessibility
if ((alpha == 0) ^ (mTransformationInfo.mAlpha == 0)) {
notifySubtreeAccessibilityStateChangedIfNeeded();
}
mTransformationInfo.mAlpha = alpha;
if (onSetAlpha((int) (alpha * 255))) {
mPrivateFlags |= PFLAG_ALPHA_SET;
// subclass is handling alpha - don't optimize rendering cache invalidation
invalidateParentCaches();
invalidate(true);
} else {
mPrivateFlags &= ~PFLAG_ALPHA_SET;
invalidateViewProperty(true, false);
mRenderNode.setAlpha(getFinalAlpha());
}
}
}
/**
* Faster version of setAlpha() which performs the same steps except there are
* no calls to invalidate(). The caller of this function should perform proper invalidation
* on the parent and this object. The return value indicates whether the subclass handles
* alpha (the return value for onSetAlpha()).
*
* @param alpha The new value for the alpha property
* @return true if the View subclass handles alpha (the return value for onSetAlpha()) and
* the new value for the alpha property is different from the old value
*/
boolean setAlphaNoInvalidation(float alpha) {
ensureTransformationInfo();
if (mTransformationInfo.mAlpha != alpha) {
mTransformationInfo.mAlpha = alpha;
boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255));
if (subclassHandlesAlpha) {
mPrivateFlags |= PFLAG_ALPHA_SET;
return true;
} else {
mPrivateFlags &= ~PFLAG_ALPHA_SET;
mRenderNode.setAlpha(getFinalAlpha());
}
}
return false;
}
/**
* This property is hidden and intended only for use by the Fade transition, which
* animates it to produce a visual translucency that does not side-effect (or get
* affected by) the real alpha property. This value is composited with the other
* alpha value (and the AlphaAnimation value, when that is present) to produce
* a final visual translucency result, which is what is passed into the DisplayList.
*
* @hide
*/
public void setTransitionAlpha(float alpha) {
ensureTransformationInfo();
if (mTransformationInfo.mTransitionAlpha != alpha) {
mTransformationInfo.mTransitionAlpha = alpha;
mPrivateFlags &= ~PFLAG_ALPHA_SET;
invalidateViewProperty(true, false);
mRenderNode.setAlpha(getFinalAlpha());
}
}
/**
* Calculates the visual alpha of this view, which is a combination of the actual
* alpha value and the transitionAlpha value (if set).
*/
private float getFinalAlpha() {
if (mTransformationInfo != null) {
return mTransformationInfo.mAlpha * mTransformationInfo.mTransitionAlpha;
}
return 1;
}
/**
* This property is hidden and intended only for use by the Fade transition, which
* animates it to produce a visual translucency that does not side-effect (or get
* affected by) the real alpha property. This value is composited with the other
* alpha value (and the AlphaAnimation value, when that is present) to produce
* a final visual translucency result, which is what is passed into the DisplayList.
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getTransitionAlpha() {
return mTransformationInfo != null ? mTransformationInfo.mTransitionAlpha : 1;
}
/**
* Top position of this view relative to its parent.
*
* @return The top of this view, in pixels.
*/
@ViewDebug.CapturedViewProperty
public final int getTop() {
return mTop;
}
/**
* Sets the top position of this view relative to its parent. This method is meant to be called
* by the layout system and should not generally be called otherwise, because the property
* may be changed at any time by the layout.
*
* @param top The top of this view, in pixels.
*/
public final void setTop(int top) {
if (top != mTop) {
final boolean matrixIsIdentity = hasIdentityMatrix();
if (matrixIsIdentity) {
if (mAttachInfo != null) {
int minTop;
int yLoc;
if (top < mTop) {
minTop = top;
yLoc = top - mTop;
} else {
minTop = mTop;
yLoc = 0;
}
invalidate(0, yLoc, mRight - mLeft, mBottom - minTop);
}
} else {
// Double-invalidation is necessary to capture view's old and new areas
invalidate(true);
}
int width = mRight - mLeft;
int oldHeight = mBottom - mTop;
mTop = top;
mRenderNode.setTop(mTop);
sizeChange(width, mBottom - mTop, width, oldHeight);
if (!matrixIsIdentity) {
mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
invalidate(true);
}
mBackgroundSizeChanged = true;
if (mForegroundInfo != null) {
mForegroundInfo.mBoundsChanged = true;
}
invalidateParentIfNeeded();
if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
// View was rejected last time it was drawn by its parent; this may have changed
invalidateParentIfNeeded();
}
}
}
/**
* Bottom position of this view relative to its parent.
*
* @return The bottom of this view, in pixels.
*/
@ViewDebug.CapturedViewProperty
public final int getBottom() {
return mBottom;
}
/**
* True if this view has changed since the last time being drawn.
*
* @return The dirty state of this view.
*/
public boolean isDirty() {
return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0;
}
/**
* Sets the bottom position of this view relative to its parent. This method is meant to be
* called by the layout system and should not generally be called otherwise, because the
* property may be changed at any time by the layout.
*
* @param bottom The bottom of this view, in pixels.
*/
public final void setBottom(int bottom) {
if (bottom != mBottom) {
final boolean matrixIsIdentity = hasIdentityMatrix();
if (matrixIsIdentity) {
if (mAttachInfo != null) {
int maxBottom;
if (bottom < mBottom) {
maxBottom = mBottom;
} else {
maxBottom = bottom;
}
invalidate(0, 0, mRight - mLeft, maxBottom - mTop);
}
} else {
// Double-invalidation is necessary to capture view's old and new areas
invalidate(true);
}
int width = mRight - mLeft;
int oldHeight = mBottom - mTop;
mBottom = bottom;
mRenderNode.setBottom(mBottom);
sizeChange(width, mBottom - mTop, width, oldHeight);
if (!matrixIsIdentity) {
mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
invalidate(true);
}
mBackgroundSizeChanged = true;
if (mForegroundInfo != null) {
mForegroundInfo.mBoundsChanged = true;
}
invalidateParentIfNeeded();
if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
// View was rejected last time it was drawn by its parent; this may have changed
invalidateParentIfNeeded();
}
}
}
/**
* Left position of this view relative to its parent.
*
* @return The left edge of this view, in pixels.
*/
@ViewDebug.CapturedViewProperty
public final int getLeft() {
return mLeft;
}
/**
* Sets the left position of this view relative to its parent. This method is meant to be called
* by the layout system and should not generally be called otherwise, because the property
* may be changed at any time by the layout.
*
* @param left The left of this view, in pixels.
*/
public final void setLeft(int left) {
if (left != mLeft) {
final boolean matrixIsIdentity = hasIdentityMatrix();
if (matrixIsIdentity) {
if (mAttachInfo != null) {
int minLeft;
int xLoc;
if (left < mLeft) {
minLeft = left;
xLoc = left - mLeft;
} else {
minLeft = mLeft;
xLoc = 0;
}
invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop);
}
} else {
// Double-invalidation is necessary to capture view's old and new areas
invalidate(true);
}
int oldWidth = mRight - mLeft;
int height = mBottom - mTop;
mLeft = left;
mRenderNode.setLeft(left);
sizeChange(mRight - mLeft, height, oldWidth, height);
if (!matrixIsIdentity) {
mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
invalidate(true);
}
mBackgroundSizeChanged = true;
if (mForegroundInfo != null) {
mForegroundInfo.mBoundsChanged = true;
}
invalidateParentIfNeeded();
if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
// View was rejected last time it was drawn by its parent; this may have changed
invalidateParentIfNeeded();
}
}
}
/**
* Right position of this view relative to its parent.
*
* @return The right edge of this view, in pixels.
*/
@ViewDebug.CapturedViewProperty
public final int getRight() {
return mRight;
}
/**
* Sets the right position of this view relative to its parent. This method is meant to be called
* by the layout system and should not generally be called otherwise, because the property
* may be changed at any time by the layout.
*
* @param right The right of this view, in pixels.
*/
public final void setRight(int right) {
if (right != mRight) {
final boolean matrixIsIdentity = hasIdentityMatrix();
if (matrixIsIdentity) {
if (mAttachInfo != null) {
int maxRight;
if (right < mRight) {
maxRight = mRight;
} else {
maxRight = right;
}
invalidate(0, 0, maxRight - mLeft, mBottom - mTop);
}
} else {
// Double-invalidation is necessary to capture view's old and new areas
invalidate(true);
}
int oldWidth = mRight - mLeft;
int height = mBottom - mTop;
mRight = right;
mRenderNode.setRight(mRight);
sizeChange(mRight - mLeft, height, oldWidth, height);
if (!matrixIsIdentity) {
mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
invalidate(true);
}
mBackgroundSizeChanged = true;
if (mForegroundInfo != null) {
mForegroundInfo.mBoundsChanged = true;
}
invalidateParentIfNeeded();
if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) {
// View was rejected last time it was drawn by its parent; this may have changed
invalidateParentIfNeeded();
}
}
}
/**
* The visual x position of this view, in pixels. This is equivalent to the
* {@link #setTranslationX(float) translationX} property plus the current
* {@link #getLeft() left} property.
*
* @return The visual x position of this view, in pixels.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getX() {
return mLeft + getTranslationX();
}
/**
* Sets the visual x position of this view, in pixels. This is equivalent to setting the
* {@link #setTranslationX(float) translationX} property to be the difference between
* the x value passed in and the current {@link #getLeft() left} property.
*
* @param x The visual x position of this view, in pixels.
*/
public void setX(float x) {
setTranslationX(x - mLeft);
}
/**
* The visual y position of this view, in pixels. This is equivalent to the
* {@link #setTranslationY(float) translationY} property plus the current
* {@link #getTop() top} property.
*
* @return The visual y position of this view, in pixels.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getY() {
return mTop + getTranslationY();
}
/**
* Sets the visual y position of this view, in pixels. This is equivalent to setting the
* {@link #setTranslationY(float) translationY} property to be the difference between
* the y value passed in and the current {@link #getTop() top} property.
*
* @param y The visual y position of this view, in pixels.
*/
public void setY(float y) {
setTranslationY(y - mTop);
}
/**
* The visual z position of this view, in pixels. This is equivalent to the
* {@link #setTranslationZ(float) translationZ} property plus the current
* {@link #getElevation() elevation} property.
*
* @return The visual z position of this view, in pixels.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getZ() {
return getElevation() + getTranslationZ();
}
/**
* Sets the visual z position of this view, in pixels. This is equivalent to setting the
* {@link #setTranslationZ(float) translationZ} property to be the difference between
* the x value passed in and the current {@link #getElevation() elevation} property.
*
* @param z The visual z position of this view, in pixels.
*/
public void setZ(float z) {
setTranslationZ(z - getElevation());
}
/**
* The base elevation of this view relative to its parent, in pixels.
*
* @return The base depth position of the view, in pixels.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getElevation() {
return mRenderNode.getElevation();
}
/**
* Sets the base elevation of this view, in pixels.
*
* @attr ref android.R.styleable#View_elevation
*/
public void setElevation(float elevation) {
if (elevation != getElevation()) {
invalidateViewProperty(true, false);
mRenderNode.setElevation(elevation);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
}
}
/**
* The horizontal location of this view relative to its {@link #getLeft() left} position.
* This position is post-layout, in addition to wherever the object's
* layout placed it.
*
* @return The horizontal position of this view relative to its left position, in pixels.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getTranslationX() {
return mRenderNode.getTranslationX();
}
/**
* Sets the horizontal location of this view relative to its {@link #getLeft() left} position.
* This effectively positions the object post-layout, in addition to wherever the object's
* layout placed it.
*
* @param translationX The horizontal position of this view relative to its left position,
* in pixels.
*
* @attr ref android.R.styleable#View_translationX
*/
public void setTranslationX(float translationX) {
if (translationX != getTranslationX()) {
invalidateViewProperty(true, false);
mRenderNode.setTranslationX(translationX);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* The vertical location of this view relative to its {@link #getTop() top} position.
* This position is post-layout, in addition to wherever the object's
* layout placed it.
*
* @return The vertical position of this view relative to its top position,
* in pixels.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getTranslationY() {
return mRenderNode.getTranslationY();
}
/**
* Sets the vertical location of this view relative to its {@link #getTop() top} position.
* This effectively positions the object post-layout, in addition to wherever the object's
* layout placed it.
*
* @param translationY The vertical position of this view relative to its top position,
* in pixels.
*
* @attr ref android.R.styleable#View_translationY
*/
public void setTranslationY(float translationY) {
if (translationY != getTranslationY()) {
invalidateViewProperty(true, false);
mRenderNode.setTranslationY(translationY);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* The depth location of this view relative to its {@link #getElevation() elevation}.
*
* @return The depth of this view relative to its elevation.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public float getTranslationZ() {
return mRenderNode.getTranslationZ();
}
/**
* Sets the depth location of this view relative to its {@link #getElevation() elevation}.
*
* @attr ref android.R.styleable#View_translationZ
*/
public void setTranslationZ(float translationZ) {
if (translationZ != getTranslationZ()) {
invalidateViewProperty(true, false);
mRenderNode.setTranslationZ(translationZ);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
}
}
/** @hide */
public void setAnimationMatrix(Matrix matrix) {
invalidateViewProperty(true, false);
mRenderNode.setAnimationMatrix(matrix);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
}
/**
* Returns the current StateListAnimator if exists.
*
* @return StateListAnimator or null if it does not exists
* @see #setStateListAnimator(android.animation.StateListAnimator)
*/
public StateListAnimator getStateListAnimator() {
return mStateListAnimator;
}
/**
* Attaches the provided StateListAnimator to this View.
* <p>
* Any previously attached StateListAnimator will be detached.
*
* @param stateListAnimator The StateListAnimator to update the view
* @see android.animation.StateListAnimator
*/
public void setStateListAnimator(StateListAnimator stateListAnimator) {
if (mStateListAnimator == stateListAnimator) {
return;
}
if (mStateListAnimator != null) {
mStateListAnimator.setTarget(null);
}
mStateListAnimator = stateListAnimator;
if (stateListAnimator != null) {
stateListAnimator.setTarget(this);
if (isAttachedToWindow()) {
stateListAnimator.setState(getDrawableState());
}
}
}
/**
* Returns whether the Outline should be used to clip the contents of the View.
* <p>
* Note that this flag will only be respected if the View's Outline returns true from
* {@link Outline#canClip()}.
*
* @see #setOutlineProvider(ViewOutlineProvider)
* @see #setClipToOutline(boolean)
*/
public final boolean getClipToOutline() {
return mRenderNode.getClipToOutline();
}
/**
* Sets whether the View's Outline should be used to clip the contents of the View.
* <p>
* Only a single non-rectangular clip can be applied on a View at any time.
* Circular clips from a {@link ViewAnimationUtils#createCircularReveal(View, int, int, float, float)
* circular reveal} animation take priority over Outline clipping, and
* child Outline clipping takes priority over Outline clipping done by a
* parent.
* <p>
* Note that this flag will only be respected if the View's Outline returns true from
* {@link Outline#canClip()}.
*
* @see #setOutlineProvider(ViewOutlineProvider)
* @see #getClipToOutline()
*/
public void setClipToOutline(boolean clipToOutline) {
damageInParent();
if (getClipToOutline() != clipToOutline) {
mRenderNode.setClipToOutline(clipToOutline);
}
}
// correspond to the enum values of View_outlineProvider
private static final int PROVIDER_BACKGROUND = 0;
private static final int PROVIDER_NONE = 1;
private static final int PROVIDER_BOUNDS = 2;
private static final int PROVIDER_PADDED_BOUNDS = 3;
private void setOutlineProviderFromAttribute(int providerInt) {
switch (providerInt) {
case PROVIDER_BACKGROUND:
setOutlineProvider(ViewOutlineProvider.BACKGROUND);
break;
case PROVIDER_NONE:
setOutlineProvider(null);
break;
case PROVIDER_BOUNDS:
setOutlineProvider(ViewOutlineProvider.BOUNDS);
break;
case PROVIDER_PADDED_BOUNDS:
setOutlineProvider(ViewOutlineProvider.PADDED_BOUNDS);
break;
}
}
/**
* Sets the {@link ViewOutlineProvider} of the view, which generates the Outline that defines
* the shape of the shadow it casts, and enables outline clipping.
* <p>
* The default ViewOutlineProvider, {@link ViewOutlineProvider#BACKGROUND}, queries the Outline
* from the View's background drawable, via {@link Drawable#getOutline(Outline)}. Changing the
* outline provider with this method allows this behavior to be overridden.
* <p>
* If the ViewOutlineProvider is null, if querying it for an outline returns false,
* or if the produced Outline is {@link Outline#isEmpty()}, shadows will not be cast.
* <p>
* Only outlines that return true from {@link Outline#canClip()} may be used for clipping.
*
* @see #setClipToOutline(boolean)
* @see #getClipToOutline()
* @see #getOutlineProvider()
*/
public void setOutlineProvider(ViewOutlineProvider provider) {
mOutlineProvider = provider;
invalidateOutline();
}
/**
* Returns the current {@link ViewOutlineProvider} of the view, which generates the Outline
* that defines the shape of the shadow it casts, and enables outline clipping.
*
* @see #setOutlineProvider(ViewOutlineProvider)
*/
public ViewOutlineProvider getOutlineProvider() {
return mOutlineProvider;
}
/**
* Called to rebuild this View's Outline from its {@link ViewOutlineProvider outline provider}
*
* @see #setOutlineProvider(ViewOutlineProvider)
*/
public void invalidateOutline() {
rebuildOutline();
notifySubtreeAccessibilityStateChangedIfNeeded();
invalidateViewProperty(false, false);
}
/**
* Internal version of {@link #invalidateOutline()} which invalidates the
* outline without invalidating the view itself. This is intended to be called from
* within methods in the View class itself which are the result of the view being
* invalidated already. For example, when we are drawing the background of a View,
* we invalidate the outline in case it changed in the meantime, but we do not
* need to invalidate the view because we're already drawing the background as part
* of drawing the view in response to an earlier invalidation of the view.
*/
private void rebuildOutline() {
// Unattached views ignore this signal, and outline is recomputed in onAttachedToWindow()
if (mAttachInfo == null) return;
if (mOutlineProvider == null) {
// no provider, remove outline
mRenderNode.setOutline(null);
} else {
final Outline outline = mAttachInfo.mTmpOutline;
outline.setEmpty();
outline.setAlpha(1.0f);
mOutlineProvider.getOutline(this, outline);
mRenderNode.setOutline(outline);
}
}
/**
* HierarchyViewer only
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "drawing")
public boolean hasShadow() {
return mRenderNode.hasShadow();
}
/** @hide */
public void setRevealClip(boolean shouldClip, float x, float y, float radius) {
mRenderNode.setRevealClip(shouldClip, x, y, radius);
invalidateViewProperty(false, false);
}
/**
* Hit rectangle in parent's coordinates
*
* @param outRect The hit rectangle of the view.
*/
public void getHitRect(Rect outRect) {
if (hasIdentityMatrix() || mAttachInfo == null) {
outRect.set(mLeft, mTop, mRight, mBottom);
} else {
final RectF tmpRect = mAttachInfo.mTmpTransformRect;
tmpRect.set(0, 0, getWidth(), getHeight());
getMatrix().mapRect(tmpRect); // TODO: mRenderNode.mapRect(tmpRect)
outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop,
(int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop);
}
}
/**
* Determines whether the given point, in local coordinates is inside the view.
*/
/*package*/ final boolean pointInView(float localX, float localY) {
return pointInView(localX, localY, 0);
}
/**
* Utility method to determine whether the given point, in local coordinates,
* is inside the view, where the area of the view is expanded by the slop factor.
* This method is called while processing touch-move events to determine if the event
* is still within the view.
*
* @hide
*/
public boolean pointInView(float localX, float localY, float slop) {
return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) &&
localY < ((mBottom - mTop) + slop);
}
/**
* When a view has focus and the user navigates away from it, the next view is searched for
* starting from the rectangle filled in by this method.
*
* By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)})
* of the view. However, if your view maintains some idea of internal selection,
* such as a cursor, or a selected row or column, you should override this method and
* fill in a more specific rectangle.
*
* @param r The rectangle to fill in, in this view's coordinates.
*/
public void getFocusedRect(Rect r) {
getDrawingRect(r);
}
/**
* If some part of this view is not clipped by any of its parents, then
* return that area in r in global (root) coordinates. To convert r to local
* coordinates (without taking possible View rotations into account), offset
* it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)).
* If the view is completely clipped or translated out, return false.
*
* @param r If true is returned, r holds the global coordinates of the
* visible portion of this view.
* @param globalOffset If true is returned, globalOffset holds the dx,dy
* between this view and its root. globalOffet may be null.
* @return true if r is non-empty (i.e. part of the view is visible at the
* root level.
*/
public boolean getGlobalVisibleRect(Rect r, Point globalOffset) {
int width = mRight - mLeft;
int height = mBottom - mTop;
if (width > 0 && height > 0) {
r.set(0, 0, width, height);
if (globalOffset != null) {
globalOffset.set(-mScrollX, -mScrollY);
}
return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset);
}
return false;
}
public final boolean getGlobalVisibleRect(Rect r) {
return getGlobalVisibleRect(r, null);
}
public final boolean getLocalVisibleRect(Rect r) {
final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point();
if (getGlobalVisibleRect(r, offset)) {
r.offset(-offset.x, -offset.y); // make r local
return true;
}
return false;
}
/**
* Offset this view's vertical location by the specified number of pixels.
*
* @param offset the number of pixels to offset the view by
*/
public void offsetTopAndBottom(int offset) {
if (offset != 0) {
final boolean matrixIsIdentity = hasIdentityMatrix();
if (matrixIsIdentity) {
if (isHardwareAccelerated()) {
invalidateViewProperty(false, false);
} else {
final ViewParent p = mParent;
if (p != null && mAttachInfo != null) {
final Rect r = mAttachInfo.mTmpInvalRect;
int minTop;
int maxBottom;
int yLoc;
if (offset < 0) {
minTop = mTop + offset;
maxBottom = mBottom;
yLoc = offset;
} else {
minTop = mTop;
maxBottom = mBottom + offset;
yLoc = 0;
}
r.set(0, yLoc, mRight - mLeft, maxBottom - minTop);
p.invalidateChild(this, r);
}
}
} else {
invalidateViewProperty(false, false);
}
mTop += offset;
mBottom += offset;
mRenderNode.offsetTopAndBottom(offset);
if (isHardwareAccelerated()) {
invalidateViewProperty(false, false);
invalidateParentIfNeededAndWasQuickRejected();
} else {
if (!matrixIsIdentity) {
invalidateViewProperty(false, true);
}
invalidateParentIfNeeded();
}
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* Offset this view's horizontal location by the specified amount of pixels.
*
* @param offset the number of pixels to offset the view by
*/
public void offsetLeftAndRight(int offset) {
if (offset != 0) {
final boolean matrixIsIdentity = hasIdentityMatrix();
if (matrixIsIdentity) {
if (isHardwareAccelerated()) {
invalidateViewProperty(false, false);
} else {
final ViewParent p = mParent;
if (p != null && mAttachInfo != null) {
final Rect r = mAttachInfo.mTmpInvalRect;
int minLeft;
int maxRight;
if (offset < 0) {
minLeft = mLeft + offset;
maxRight = mRight;
} else {
minLeft = mLeft;
maxRight = mRight + offset;
}
r.set(0, 0, maxRight - minLeft, mBottom - mTop);
p.invalidateChild(this, r);
}
}
} else {
invalidateViewProperty(false, false);
}
mLeft += offset;
mRight += offset;
mRenderNode.offsetLeftAndRight(offset);
if (isHardwareAccelerated()) {
invalidateViewProperty(false, false);
invalidateParentIfNeededAndWasQuickRejected();
} else {
if (!matrixIsIdentity) {
invalidateViewProperty(false, true);
}
invalidateParentIfNeeded();
}
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
/**
* Get the LayoutParams associated with this view. All views should have
* layout parameters. These supply parameters to the <i>parent</i> of this
* view specifying how it should be arranged. There are many subclasses of
* ViewGroup.LayoutParams, and these correspond to the different subclasses
* of ViewGroup that are responsible for arranging their children.
*
* This method may return null if this View is not attached to a parent
* ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)}
* was not invoked successfully. When a View is attached to a parent
* ViewGroup, this method must not return null.
*
* @return The LayoutParams associated with this view, or null if no
* parameters have been set yet
*/
@ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_")
public ViewGroup.LayoutParams getLayoutParams() {
return mLayoutParams;
}
/**
* Set the layout parameters associated with this view. These supply
* parameters to the <i>parent</i> of this view specifying how it should be
* arranged. There are many subclasses of ViewGroup.LayoutParams, and these
* correspond to the different subclasses of ViewGroup that are responsible
* for arranging their children.
*
* @param params The layout parameters for this view, cannot be null
*/
public void setLayoutParams(ViewGroup.LayoutParams params) {
if (params == null) {
throw new NullPointerException("Layout parameters cannot be null");
}
mLayoutParams = params;
resolveLayoutParams();
if (mParent instanceof ViewGroup) {
((ViewGroup) mParent).onSetLayoutParams(this, params);
}
requestLayout();
}
/**
* Resolve the layout parameters depending on the resolved layout direction
*
* @hide
*/
public void resolveLayoutParams() {
if (mLayoutParams != null) {
mLayoutParams.resolveLayoutDirection(getLayoutDirection());
}
}
/**
* Set the scrolled position of your view. This will cause a call to
* {@link #onScrollChanged(int, int, int, int)} and the view will be
* invalidated.
* @param x the x position to scroll to
* @param y the y position to scroll to
*/
public void scrollTo(int x, int y) {
if (mScrollX != x || mScrollY != y) {
int oldX = mScrollX;
int oldY = mScrollY;
mScrollX = x;
mScrollY = y;
invalidateParentCaches();
onScrollChanged(mScrollX, mScrollY, oldX, oldY);
if (!awakenScrollBars()) {
postInvalidateOnAnimation();
}
}
}
/**
* Move the scrolled position of your view. This will cause a call to
* {@link #onScrollChanged(int, int, int, int)} and the view will be
* invalidated.
* @param x the amount of pixels to scroll by horizontally
* @param y the amount of pixels to scroll by vertically
*/
public void scrollBy(int x, int y) {
scrollTo(mScrollX + x, mScrollY + y);
}
/**
* <p>Trigger the scrollbars to draw. When invoked this method starts an
* animation to fade the scrollbars out after a default delay. If a subclass
* provides animated scrolling, the start delay should equal the duration
* of the scrolling animation.</p>
*
* <p>The animation starts only if at least one of the scrollbars is
* enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and
* {@link #isVerticalScrollBarEnabled()}. When the animation is started,
* this method returns true, and false otherwise. If the animation is
* started, this method calls {@link #invalidate()}; in that case the
* caller should not call {@link #invalidate()}.</p>
*
* <p>This method should be invoked every time a subclass directly updates
* the scroll parameters.</p>
*
* <p>This method is automatically invoked by {@link #scrollBy(int, int)}
* and {@link #scrollTo(int, int)}.</p>
*
* @return true if the animation is played, false otherwise
*
* @see #awakenScrollBars(int)
* @see #scrollBy(int, int)
* @see #scrollTo(int, int)
* @see #isHorizontalScrollBarEnabled()
* @see #isVerticalScrollBarEnabled()
* @see #setHorizontalScrollBarEnabled(boolean)
* @see #setVerticalScrollBarEnabled(boolean)
*/
protected boolean awakenScrollBars() {
return mScrollCache != null &&
awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true);
}
/**
* Trigger the scrollbars to draw.
* This method differs from awakenScrollBars() only in its default duration.
* initialAwakenScrollBars() will show the scroll bars for longer than
* usual to give the user more of a chance to notice them.
*
* @return true if the animation is played, false otherwise.
*/
private boolean initialAwakenScrollBars() {
return mScrollCache != null &&
awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true);
}
/**
* <p>
* Trigger the scrollbars to draw. When invoked this method starts an
* animation to fade the scrollbars out after a fixed delay. If a subclass
* provides animated scrolling, the start delay should equal the duration of
* the scrolling animation.
* </p>
*
* <p>
* The animation starts only if at least one of the scrollbars is enabled,
* as specified by {@link #isHorizontalScrollBarEnabled()} and
* {@link #isVerticalScrollBarEnabled()}. When the animation is started,
* this method returns true, and false otherwise. If the animation is
* started, this method calls {@link #invalidate()}; in that case the caller
* should not call {@link #invalidate()}.
* </p>
*
* <p>
* This method should be invoked every time a subclass directly updates the
* scroll parameters.
* </p>
*
* @param startDelay the delay, in milliseconds, after which the animation
* should start; when the delay is 0, the animation starts
* immediately
* @return true if the animation is played, false otherwise
*
* @see #scrollBy(int, int)
* @see #scrollTo(int, int)
* @see #isHorizontalScrollBarEnabled()
* @see #isVerticalScrollBarEnabled()
* @see #setHorizontalScrollBarEnabled(boolean)
* @see #setVerticalScrollBarEnabled(boolean)
*/
protected boolean awakenScrollBars(int startDelay) {
return awakenScrollBars(startDelay, true);
}
/**
* <p>
* Trigger the scrollbars to draw. When invoked this method starts an
* animation to fade the scrollbars out after a fixed delay. If a subclass
* provides animated scrolling, the start delay should equal the duration of
* the scrolling animation.
* </p>
*
* <p>
* The animation starts only if at least one of the scrollbars is enabled,
* as specified by {@link #isHorizontalScrollBarEnabled()} and
* {@link #isVerticalScrollBarEnabled()}. When the animation is started,
* this method returns true, and false otherwise. If the animation is
* started, this method calls {@link #invalidate()} if the invalidate parameter
* is set to true; in that case the caller
* should not call {@link #invalidate()}.
* </p>
*
* <p>
* This method should be invoked every time a subclass directly updates the
* scroll parameters.
* </p>
*
* @param startDelay the delay, in milliseconds, after which the animation
* should start; when the delay is 0, the animation starts
* immediately
*
* @param invalidate Whether this method should call invalidate
*
* @return true if the animation is played, false otherwise
*
* @see #scrollBy(int, int)
* @see #scrollTo(int, int)
* @see #isHorizontalScrollBarEnabled()
* @see #isVerticalScrollBarEnabled()
* @see #setHorizontalScrollBarEnabled(boolean)
* @see #setVerticalScrollBarEnabled(boolean)
*/
protected boolean awakenScrollBars(int startDelay, boolean invalidate) {
final ScrollabilityCache scrollCache = mScrollCache;
if (scrollCache == null || !scrollCache.fadeScrollBars) {
return false;
}
if (scrollCache.scrollBar == null) {
scrollCache.scrollBar = new ScrollBarDrawable();
scrollCache.scrollBar.setState(getDrawableState());
scrollCache.scrollBar.setCallback(this);
}
if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) {
if (invalidate) {
// Invalidate to show the scrollbars
postInvalidateOnAnimation();
}
if (scrollCache.state == ScrollabilityCache.OFF) {
// FIXME: this is copied from WindowManagerService.
// We should get this value from the system when it
// is possible to do so.
final int KEY_REPEAT_FIRST_DELAY = 750;
startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay);
}
// Tell mScrollCache when we should start fading. This may
// extend the fade start time if one was already scheduled
long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay;
scrollCache.fadeStartTime = fadeStartTime;
scrollCache.state = ScrollabilityCache.ON;
// Schedule our fader to run, unscheduling any old ones first
if (mAttachInfo != null) {
mAttachInfo.mHandler.removeCallbacks(scrollCache);
mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime);
}
return true;
}
return false;
}
/**
* Do not invalidate views which are not visible and which are not running an animation. They
* will not get drawn and they should not set dirty flags as if they will be drawn
*/
private boolean skipInvalidate() {
return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null &&
(!(mParent instanceof ViewGroup) ||
!((ViewGroup) mParent).isViewTransitioning(this));
}
/**
* Mark the area defined by dirty as needing to be drawn. If the view is
* visible, {@link #onDraw(android.graphics.Canvas)} will be called at some
* point in the future.
* <p>
* This must be called from a UI thread. To call from a non-UI thread, call
* {@link #postInvalidate()}.
* <p>
* <b>WARNING:</b> In API 19 and below, this method may be destructive to
* {@code dirty}.
*
* @param dirty the rectangle representing the bounds of the dirty region
*/
public void invalidate(Rect dirty) {
final int scrollX = mScrollX;
final int scrollY = mScrollY;
invalidateInternal(dirty.left - scrollX, dirty.top - scrollY,
dirty.right - scrollX, dirty.bottom - scrollY, true, false);
}
/**
* Mark the area defined by the rect (l,t,r,b) as needing to be drawn. The
* coordinates of the dirty rect are relative to the view. If the view is
* visible, {@link #onDraw(android.graphics.Canvas)} will be called at some
* point in the future.
* <p>
* This must be called from a UI thread. To call from a non-UI thread, call
* {@link #postInvalidate()}.
*
* @param l the left position of the dirty region
* @param t the top position of the dirty region
* @param r the right position of the dirty region
* @param b the bottom position of the dirty region
*/
public void invalidate(int l, int t, int r, int b) {
final int scrollX = mScrollX;
final int scrollY = mScrollY;
invalidateInternal(l - scrollX, t - scrollY, r - scrollX, b - scrollY, true, false);
}
/**
* Invalidate the whole view. If the view is visible,
* {@link #onDraw(android.graphics.Canvas)} will be called at some point in
* the future.
* <p>
* This must be called from a UI thread. To call from a non-UI thread, call
* {@link #postInvalidate()}.
*/
public void invalidate() {
invalidate(true);
}
/**
* This is where the invalidate() work actually happens. A full invalidate()
* causes the drawing cache to be invalidated, but this function can be
* called with invalidateCache set to false to skip that invalidation step
* for cases that do not need it (for example, a component that remains at
* the same dimensions with the same content).
*
* @param invalidateCache Whether the drawing cache for this view should be
* invalidated as well. This is usually true for a full
* invalidate, but may be set to false if the View's contents or
* dimensions have not changed.
*/
void invalidate(boolean invalidateCache) {
invalidateInternal(0, 0, mRight - mLeft, mBottom - mTop, invalidateCache, true);
}
void invalidateInternal(int l, int t, int r, int b, boolean invalidateCache,
boolean fullInvalidate) {
if (mGhostView != null) {
mGhostView.invalidate(true);
return;
}
if (skipInvalidate()) {
return;
}
if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)
|| (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID)
|| (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED
|| (fullInvalidate && isOpaque() != mLastIsOpaque)) {
if (fullInvalidate) {
mLastIsOpaque = isOpaque();
mPrivateFlags &= ~PFLAG_DRAWN;
}
mPrivateFlags |= PFLAG_DIRTY;
if (invalidateCache) {
mPrivateFlags |= PFLAG_INVALIDATED;
mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
}
// Propagate the damage rectangle to the parent view.
final AttachInfo ai = mAttachInfo;
final ViewParent p = mParent;
if (p != null && ai != null && l < r && t < b) {
final Rect damage = ai.mTmpInvalRect;
damage.set(l, t, r, b);
p.invalidateChild(this, damage);
}
// Damage the entire projection receiver, if necessary.
if (mBackground != null && mBackground.isProjected()) {
final View receiver = getProjectionReceiver();
if (receiver != null) {
receiver.damageInParent();
}
}
// Damage the entire IsolatedZVolume receiving this view's shadow.
if (isHardwareAccelerated() && getZ() != 0) {
damageShadowReceiver();
}
}
}
/**
* @return this view's projection receiver, or {@code null} if none exists
*/
private View getProjectionReceiver() {
ViewParent p = getParent();
while (p != null && p instanceof View) {
final View v = (View) p;
if (v.isProjectionReceiver()) {
return v;
}
p = p.getParent();
}
return null;
}
/**
* @return whether the view is a projection receiver
*/
private boolean isProjectionReceiver() {
return mBackground != null;
}
/**
* Damage area of the screen that can be covered by this View's shadow.
*
* This method will guarantee that any changes to shadows cast by a View
* are damaged on the screen for future redraw.
*/
private void damageShadowReceiver() {
final AttachInfo ai = mAttachInfo;
if (ai != null) {
ViewParent p = getParent();
if (p != null && p instanceof ViewGroup) {
final ViewGroup vg = (ViewGroup) p;
vg.damageInParent();
}
}
}
/**
* Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to
* set any flags or handle all of the cases handled by the default invalidation methods.
* Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate
* dirty rect. This method calls into fast invalidation methods in ViewGroup that
* walk up the hierarchy, transforming the dirty rect as necessary.
*
* The method also handles normal invalidation logic if display list properties are not
* being used in this view. The invalidateParent and forceRedraw flags are used by that
* backup approach, to handle these cases used in the various property-setting methods.
*
* @param invalidateParent Force a call to invalidateParentCaches() if display list properties
* are not being used in this view
* @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display
* list properties are not being used in this view
*/
void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) {
if (!isHardwareAccelerated()
|| !mRenderNode.isValid()
|| (mPrivateFlags & PFLAG_DRAW_ANIMATION) != 0) {
if (invalidateParent) {
invalidateParentCaches();
}
if (forceRedraw) {
mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation
}
invalidate(false);
} else {
damageInParent();
}
if (isHardwareAccelerated() && invalidateParent && getZ() != 0) {
damageShadowReceiver();
}
}
/**
* Tells the parent view to damage this view's bounds.
*
* @hide
*/
protected void damageInParent() {
final AttachInfo ai = mAttachInfo;
final ViewParent p = mParent;
if (p != null && ai != null) {
final Rect r = ai.mTmpInvalRect;
r.set(0, 0, mRight - mLeft, mBottom - mTop);
if (mParent instanceof ViewGroup) {
((ViewGroup) mParent).damageChild(this, r);
} else {
mParent.invalidateChild(this, r);
}
}
}
/**
* Utility method to transform a given Rect by the current matrix of this view.
*/
void transformRect(final Rect rect) {
if (!getMatrix().isIdentity()) {
RectF boundingRect = mAttachInfo.mTmpTransformRect;
boundingRect.set(rect);
getMatrix().mapRect(boundingRect);
rect.set((int) Math.floor(boundingRect.left),
(int) Math.floor(boundingRect.top),
(int) Math.ceil(boundingRect.right),
(int) Math.ceil(boundingRect.bottom));
}
}
/**
* Used to indicate that the parent of this view should clear its caches. This functionality
* is used to force the parent to rebuild its display list (when hardware-accelerated),
* which is necessary when various parent-managed properties of the view change, such as
* alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only
* clears the parent caches and does not causes an invalidate event.
*
* @hide
*/
protected void invalidateParentCaches() {
if (mParent instanceof View) {
((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED;
}
}
/**
* Used to indicate that the parent of this view should be invalidated. This functionality
* is used to force the parent to rebuild its display list (when hardware-accelerated),
* which is necessary when various parent-managed properties of the view change, such as
* alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate
* an invalidation event to the parent.
*
* @hide
*/
protected void invalidateParentIfNeeded() {
if (isHardwareAccelerated() && mParent instanceof View) {
((View) mParent).invalidate(true);
}
}
/**
* @hide
*/
protected void invalidateParentIfNeededAndWasQuickRejected() {
if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) != 0) {
// View was rejected last time it was drawn by its parent; this may have changed
invalidateParentIfNeeded();
}
}
/**
* Indicates whether this View is opaque. An opaque View guarantees that it will
* draw all the pixels overlapping its bounds using a fully opaque color.
*
* Subclasses of View should override this method whenever possible to indicate
* whether an instance is opaque. Opaque Views are treated in a special way by
* the View hierarchy, possibly allowing it to perform optimizations during
* invalidate/draw passes.
*
* @return True if this View is guaranteed to be fully opaque, false otherwise.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public boolean isOpaque() {
return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK &&
getFinalAlpha() >= 1.0f;
}
/**
* @hide
*/
protected void computeOpaqueFlags() {
// Opaque if:
// - Has a background
// - Background is opaque
// - Doesn't have scrollbars or scrollbars overlay
if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) {
mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND;
} else {
mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND;
}
final int flags = mViewFlags;
if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) ||
(flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY ||
(flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) {
mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS;
} else {
mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS;
}
}
/**
* @hide
*/
protected boolean hasOpaqueScrollbars() {
return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS;
}
/**
* @return A handler associated with the thread running the View. This
* handler can be used to pump events in the UI events queue.
*/
public Handler getHandler() {
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
return attachInfo.mHandler;
}
return null;
}
/**
* Returns the queue of runnable for this view.
*
* @return the queue of runnables for this view
*/
private HandlerActionQueue getRunQueue() {
if (mRunQueue == null) {
mRunQueue = new HandlerActionQueue();
}
return mRunQueue;
}
/**
* Gets the view root associated with the View.
* @return The view root, or null if none.
* @hide
*/
public ViewRootImpl getViewRootImpl() {
if (mAttachInfo != null) {
return mAttachInfo.mViewRootImpl;
}
return null;
}
/**
* @hide
*/
public ThreadedRenderer getHardwareRenderer() {
return mAttachInfo != null ? mAttachInfo.mHardwareRenderer : null;
}
/**
* <p>Causes the Runnable to be added to the message queue.
* The runnable will be run on the user interface thread.</p>
*
* @param action The Runnable that will be executed.
*
* @return Returns true if the Runnable was successfully placed in to the
* message queue. Returns false on failure, usually because the
* looper processing the message queue is exiting.
*
* @see #postDelayed
* @see #removeCallbacks
*/
public boolean post(Runnable action) {
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
return attachInfo.mHandler.post(action);
}
// Postpone the runnable until we know on which thread it needs to run.
// Assume that the runnable will be successfully placed after attach.
getRunQueue().post(action);
return true;
}
/**
* <p>Causes the Runnable to be added to the message queue, to be run
* after the specified amount of time elapses.
* The runnable will be run on the user interface thread.</p>
*
* @param action The Runnable that will be executed.
* @param delayMillis The delay (in milliseconds) until the Runnable
* will be executed.
*
* @return true if the Runnable was successfully placed in to the
* message queue. Returns false on failure, usually because the
* looper processing the message queue is exiting. Note that a
* result of true does not mean the Runnable will be processed --
* if the looper is quit before the delivery time of the message
* occurs then the message will be dropped.
*
* @see #post
* @see #removeCallbacks
*/
public boolean postDelayed(Runnable action, long delayMillis) {
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
return attachInfo.mHandler.postDelayed(action, delayMillis);
}
// Postpone the runnable until we know on which thread it needs to run.
// Assume that the runnable will be successfully placed after attach.
getRunQueue().postDelayed(action, delayMillis);
return true;
}
/**
* <p>Causes the Runnable to execute on the next animation time step.
* The runnable will be run on the user interface thread.</p>
*
* @param action The Runnable that will be executed.
*
* @see #postOnAnimationDelayed
* @see #removeCallbacks
*/
public void postOnAnimation(Runnable action) {
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
attachInfo.mViewRootImpl.mChoreographer.postCallback(
Choreographer.CALLBACK_ANIMATION, action, null);
} else {
// Postpone the runnable until we know
// on which thread it needs to run.
getRunQueue().post(action);
}
}
/**
* <p>Causes the Runnable to execute on the next animation time step,
* after the specified amount of time elapses.
* The runnable will be run on the user interface thread.</p>
*
* @param action The Runnable that will be executed.
* @param delayMillis The delay (in milliseconds) until the Runnable
* will be executed.
*
* @see #postOnAnimation
* @see #removeCallbacks
*/
public void postOnAnimationDelayed(Runnable action, long delayMillis) {
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed(
Choreographer.CALLBACK_ANIMATION, action, null, delayMillis);
} else {
// Postpone the runnable until we know
// on which thread it needs to run.
getRunQueue().postDelayed(action, delayMillis);
}
}
/**
* <p>Removes the specified Runnable from the message queue.</p>
*
* @param action The Runnable to remove from the message handling queue
*
* @return true if this view could ask the Handler to remove the Runnable,
* false otherwise. When the returned value is true, the Runnable
* may or may not have been actually removed from the message queue
* (for instance, if the Runnable was not in the queue already.)
*
* @see #post
* @see #postDelayed
* @see #postOnAnimation
* @see #postOnAnimationDelayed
*/
public boolean removeCallbacks(Runnable action) {
if (action != null) {
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
attachInfo.mHandler.removeCallbacks(action);
attachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
Choreographer.CALLBACK_ANIMATION, action, null);
}
getRunQueue().removeCallbacks(action);
}
return true;
}
/**
* <p>Cause an invalidate to happen on a subsequent cycle through the event loop.
* Use this to invalidate the View from a non-UI thread.</p>
*
* <p>This method can be invoked from outside of the UI thread
* only when this View is attached to a window.</p>
*
* @see #invalidate()
* @see #postInvalidateDelayed(long)
*/
public void postInvalidate() {
postInvalidateDelayed(0);
}
/**
* <p>Cause an invalidate of the specified area to happen on a subsequent cycle
* through the event loop. Use this to invalidate the View from a non-UI thread.</p>
*
* <p>This method can be invoked from outside of the UI thread
* only when this View is attached to a window.</p>
*
* @param left The left coordinate of the rectangle to invalidate.
* @param top The top coordinate of the rectangle to invalidate.
* @param right The right coordinate of the rectangle to invalidate.
* @param bottom The bottom coordinate of the rectangle to invalidate.
*
* @see #invalidate(int, int, int, int)
* @see #invalidate(Rect)
* @see #postInvalidateDelayed(long, int, int, int, int)
*/
public void postInvalidate(int left, int top, int right, int bottom) {
postInvalidateDelayed(0, left, top, right, bottom);
}
/**
* <p>Cause an invalidate to happen on a subsequent cycle through the event
* loop. Waits for the specified amount of time.</p>
*
* <p>This method can be invoked from outside of the UI thread
* only when this View is attached to a window.</p>
*
* @param delayMilliseconds the duration in milliseconds to delay the
* invalidation by
*
* @see #invalidate()
* @see #postInvalidate()
*/
public void postInvalidateDelayed(long delayMilliseconds) {
// We try only with the AttachInfo because there's no point in invalidating
// if we are not attached to our window
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds);
}
}
/**
* <p>Cause an invalidate of the specified area to happen on a subsequent cycle
* through the event loop. Waits for the specified amount of time.</p>
*
* <p>This method can be invoked from outside of the UI thread
* only when this View is attached to a window.</p>
*
* @param delayMilliseconds the duration in milliseconds to delay the
* invalidation by
* @param left The left coordinate of the rectangle to invalidate.
* @param top The top coordinate of the rectangle to invalidate.
* @param right The right coordinate of the rectangle to invalidate.
* @param bottom The bottom coordinate of the rectangle to invalidate.
*
* @see #invalidate(int, int, int, int)
* @see #invalidate(Rect)
* @see #postInvalidate(int, int, int, int)
*/
public void postInvalidateDelayed(long delayMilliseconds, int left, int top,
int right, int bottom) {
// We try only with the AttachInfo because there's no point in invalidating
// if we are not attached to our window
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain();
info.target = this;
info.left = left;
info.top = top;
info.right = right;
info.bottom = bottom;
attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds);
}
}
/**
* <p>Cause an invalidate to happen on the next animation time step, typically the
* next display frame.</p>
*
* <p>This method can be invoked from outside of the UI thread
* only when this View is attached to a window.</p>
*
* @see #invalidate()
*/
public void postInvalidateOnAnimation() {
// We try only with the AttachInfo because there's no point in invalidating
// if we are not attached to our window
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this);
}
}
/**
* <p>Cause an invalidate of the specified area to happen on the next animation
* time step, typically the next display frame.</p>
*
* <p>This method can be invoked from outside of the UI thread
* only when this View is attached to a window.</p>
*
* @param left The left coordinate of the rectangle to invalidate.
* @param top The top coordinate of the rectangle to invalidate.
* @param right The right coordinate of the rectangle to invalidate.
* @param bottom The bottom coordinate of the rectangle to invalidate.
*
* @see #invalidate(int, int, int, int)
* @see #invalidate(Rect)
*/
public void postInvalidateOnAnimation(int left, int top, int right, int bottom) {
// We try only with the AttachInfo because there's no point in invalidating
// if we are not attached to our window
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo != null) {
final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain();
info.target = this;
info.left = left;
info.top = top;
info.right = right;
info.bottom = bottom;
attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info);
}
}
/**
* Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event.
* This event is sent at most once every
* {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}.
*/
private void postSendViewScrolledAccessibilityEventCallback() {
if (mSendViewScrolledAccessibilityEvent == null) {
mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent();
}
if (!mSendViewScrolledAccessibilityEvent.mIsPending) {
mSendViewScrolledAccessibilityEvent.mIsPending = true;
postDelayed(mSendViewScrolledAccessibilityEvent,
ViewConfiguration.getSendRecurringAccessibilityEventsInterval());
}
}
/**
* Called by a parent to request that a child update its values for mScrollX
* and mScrollY if necessary. This will typically be done if the child is
* animating a scroll using a {@link android.widget.Scroller Scroller}
* object.
*/
public void computeScroll() {
}
/**
* <p>Indicate whether the horizontal edges are faded when the view is
* scrolled horizontally.</p>
*
* @return true if the horizontal edges should are faded on scroll, false
* otherwise
*
* @see #setHorizontalFadingEdgeEnabled(boolean)
*
* @attr ref android.R.styleable#View_requiresFadingEdge
*/
public boolean isHorizontalFadingEdgeEnabled() {
return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL;
}
/**
* <p>Define whether the horizontal edges should be faded when this view
* is scrolled horizontally.</p>
*
* @param horizontalFadingEdgeEnabled true if the horizontal edges should
* be faded when the view is scrolled
* horizontally
*
* @see #isHorizontalFadingEdgeEnabled()
*
* @attr ref android.R.styleable#View_requiresFadingEdge
*/
public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) {
if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) {
if (horizontalFadingEdgeEnabled) {
initScrollCache();
}
mViewFlags ^= FADING_EDGE_HORIZONTAL;
}
}
/**
* <p>Indicate whether the vertical edges are faded when the view is
* scrolled horizontally.</p>
*
* @return true if the vertical edges should are faded on scroll, false
* otherwise
*
* @see #setVerticalFadingEdgeEnabled(boolean)
*
* @attr ref android.R.styleable#View_requiresFadingEdge
*/
public boolean isVerticalFadingEdgeEnabled() {
return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL;
}
/**
* <p>Define whether the vertical edges should be faded when this view
* is scrolled vertically.</p>
*
* @param verticalFadingEdgeEnabled true if the vertical edges should
* be faded when the view is scrolled
* vertically
*
* @see #isVerticalFadingEdgeEnabled()
*
* @attr ref android.R.styleable#View_requiresFadingEdge
*/
public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) {
if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) {
if (verticalFadingEdgeEnabled) {
initScrollCache();
}
mViewFlags ^= FADING_EDGE_VERTICAL;
}
}
/**
* Returns the strength, or intensity, of the top faded edge. The strength is
* a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
* returns 0.0 or 1.0 but no value in between.
*
* Subclasses should override this method to provide a smoother fade transition
* when scrolling occurs.
*
* @return the intensity of the top fade as a float between 0.0f and 1.0f
*/
protected float getTopFadingEdgeStrength() {
return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f;
}
/**
* Returns the strength, or intensity, of the bottom faded edge. The strength is
* a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
* returns 0.0 or 1.0 but no value in between.
*
* Subclasses should override this method to provide a smoother fade transition
* when scrolling occurs.
*
* @return the intensity of the bottom fade as a float between 0.0f and 1.0f
*/
protected float getBottomFadingEdgeStrength() {
return computeVerticalScrollOffset() + computeVerticalScrollExtent() <
computeVerticalScrollRange() ? 1.0f : 0.0f;
}
/**
* Returns the strength, or intensity, of the left faded edge. The strength is
* a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
* returns 0.0 or 1.0 but no value in between.
*
* Subclasses should override this method to provide a smoother fade transition
* when scrolling occurs.
*
* @return the intensity of the left fade as a float between 0.0f and 1.0f
*/
protected float getLeftFadingEdgeStrength() {
return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f;
}
/**
* Returns the strength, or intensity, of the right faded edge. The strength is
* a value between 0.0 (no fade) and 1.0 (full fade). The default implementation
* returns 0.0 or 1.0 but no value in between.
*
* Subclasses should override this method to provide a smoother fade transition
* when scrolling occurs.
*
* @return the intensity of the right fade as a float between 0.0f and 1.0f
*/
protected float getRightFadingEdgeStrength() {
return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() <
computeHorizontalScrollRange() ? 1.0f : 0.0f;
}
/**
* <p>Indicate whether the horizontal scrollbar should be drawn or not. The
* scrollbar is not drawn by default.</p>
*
* @return true if the horizontal scrollbar should be painted, false
* otherwise
*
* @see #setHorizontalScrollBarEnabled(boolean)
*/
public boolean isHorizontalScrollBarEnabled() {
return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
}
/**
* <p>Define whether the horizontal scrollbar should be drawn or not. The
* scrollbar is not drawn by default.</p>
*
* @param horizontalScrollBarEnabled true if the horizontal scrollbar should
* be painted
*
* @see #isHorizontalScrollBarEnabled()
*/
public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) {
if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) {
mViewFlags ^= SCROLLBARS_HORIZONTAL;
computeOpaqueFlags();
resolvePadding();
}
}
/**
* <p>Indicate whether the vertical scrollbar should be drawn or not. The
* scrollbar is not drawn by default.</p>
*
* @return true if the vertical scrollbar should be painted, false
* otherwise
*
* @see #setVerticalScrollBarEnabled(boolean)
*/
public boolean isVerticalScrollBarEnabled() {
return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL;
}
/**
* <p>Define whether the vertical scrollbar should be drawn or not. The
* scrollbar is not drawn by default.</p>
*
* @param verticalScrollBarEnabled true if the vertical scrollbar should
* be painted
*
* @see #isVerticalScrollBarEnabled()
*/
public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) {
if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) {
mViewFlags ^= SCROLLBARS_VERTICAL;
computeOpaqueFlags();
resolvePadding();
}
}
/**
* @hide
*/
protected void recomputePadding() {
internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom);
}
/**
* Define whether scrollbars will fade when the view is not scrolling.
*
* @param fadeScrollbars whether to enable fading
*
* @attr ref android.R.styleable#View_fadeScrollbars
*/
public void setScrollbarFadingEnabled(boolean fadeScrollbars) {
initScrollCache();
final ScrollabilityCache scrollabilityCache = mScrollCache;
scrollabilityCache.fadeScrollBars = fadeScrollbars;
if (fadeScrollbars) {
scrollabilityCache.state = ScrollabilityCache.OFF;
} else {
scrollabilityCache.state = ScrollabilityCache.ON;
}
}
/**
*
* Returns true if scrollbars will fade when this view is not scrolling
*
* @return true if scrollbar fading is enabled
*
* @attr ref android.R.styleable#View_fadeScrollbars
*/
public boolean isScrollbarFadingEnabled() {
return mScrollCache != null && mScrollCache.fadeScrollBars;
}
/**
*
* Returns the delay before scrollbars fade.
*
* @return the delay before scrollbars fade
*
* @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
*/
public int getScrollBarDefaultDelayBeforeFade() {
return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() :
mScrollCache.scrollBarDefaultDelayBeforeFade;
}
/**
* Define the delay before scrollbars fade.
*
* @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade
*
* @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade
*/
public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) {
getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade;
}
/**
*
* Returns the scrollbar fade duration.
*
* @return the scrollbar fade duration
*
* @attr ref android.R.styleable#View_scrollbarFadeDuration
*/
public int getScrollBarFadeDuration() {
return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() :
mScrollCache.scrollBarFadeDuration;
}
/**
* Define the scrollbar fade duration.
*
* @param scrollBarFadeDuration - the scrollbar fade duration
*
* @attr ref android.R.styleable#View_scrollbarFadeDuration
*/
public void setScrollBarFadeDuration(int scrollBarFadeDuration) {
getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration;
}
/**
*
* Returns the scrollbar size.
*
* @return the scrollbar size
*
* @attr ref android.R.styleable#View_scrollbarSize
*/
public int getScrollBarSize() {
return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() :
mScrollCache.scrollBarSize;
}
/**
* Define the scrollbar size.
*
* @param scrollBarSize - the scrollbar size
*
* @attr ref android.R.styleable#View_scrollbarSize
*/
public void setScrollBarSize(int scrollBarSize) {
getScrollCache().scrollBarSize = scrollBarSize;
}
/**
* <p>Specify the style of the scrollbars. The scrollbars can be overlaid or
* inset. When inset, they add to the padding of the view. And the scrollbars
* can be drawn inside the padding area or on the edge of the view. For example,
* if a view has a background drawable and you want to draw the scrollbars
* inside the padding specified by the drawable, you can use
* SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to
* appear at the edge of the view, ignoring the padding, then you can use
* SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p>
* @param style the style of the scrollbars. Should be one of
* SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET,
* SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.
* @see #SCROLLBARS_INSIDE_OVERLAY
* @see #SCROLLBARS_INSIDE_INSET
* @see #SCROLLBARS_OUTSIDE_OVERLAY
* @see #SCROLLBARS_OUTSIDE_INSET
*
* @attr ref android.R.styleable#View_scrollbarStyle
*/
public void setScrollBarStyle(@ScrollBarStyle int style) {
if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) {
mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK);
computeOpaqueFlags();
resolvePadding();
}
}
/**
* <p>Returns the current scrollbar style.</p>
* @return the current scrollbar style
* @see #SCROLLBARS_INSIDE_OVERLAY
* @see #SCROLLBARS_INSIDE_INSET
* @see #SCROLLBARS_OUTSIDE_OVERLAY
* @see #SCROLLBARS_OUTSIDE_INSET
*
* @attr ref android.R.styleable#View_scrollbarStyle
*/
@ViewDebug.ExportedProperty(mapping = {
@ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"),
@ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"),
@ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"),
@ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET")
})
@ScrollBarStyle
public int getScrollBarStyle() {
return mViewFlags & SCROLLBARS_STYLE_MASK;
}
/**
* <p>Compute the horizontal range that the horizontal scrollbar
* represents.</p>
*
* <p>The range is expressed in arbitrary units that must be the same as the
* units used by {@link #computeHorizontalScrollExtent()} and
* {@link #computeHorizontalScrollOffset()}.</p>
*
* <p>The default range is the drawing width of this view.</p>
*
* @return the total horizontal range represented by the horizontal
* scrollbar
*
* @see #computeHorizontalScrollExtent()
* @see #computeHorizontalScrollOffset()
* @see android.widget.ScrollBarDrawable
*/
protected int computeHorizontalScrollRange() {
return getWidth();
}
/**
* <p>Compute the horizontal offset of the horizontal scrollbar's thumb
* within the horizontal range. This value is used to compute the position
* of the thumb within the scrollbar's track.</p>
*
* <p>The range is expressed in arbitrary units that must be the same as the
* units used by {@link #computeHorizontalScrollRange()} and
* {@link #computeHorizontalScrollExtent()}.</p>
*
* <p>The default offset is the scroll offset of this view.</p>
*
* @return the horizontal offset of the scrollbar's thumb
*
* @see #computeHorizontalScrollRange()
* @see #computeHorizontalScrollExtent()
* @see android.widget.ScrollBarDrawable
*/
protected int computeHorizontalScrollOffset() {
return mScrollX;
}
/**
* <p>Compute the horizontal extent of the horizontal scrollbar's thumb
* within the horizontal range. This value is used to compute the length
* of the thumb within the scrollbar's track.</p>
*
* <p>The range is expressed in arbitrary units that must be the same as the
* units used by {@link #computeHorizontalScrollRange()} and
* {@link #computeHorizontalScrollOffset()}.</p>
*
* <p>The default extent is the drawing width of this view.</p>
*
* @return the horizontal extent of the scrollbar's thumb
*
* @see #computeHorizontalScrollRange()
* @see #computeHorizontalScrollOffset()
* @see android.widget.ScrollBarDrawable
*/
protected int computeHorizontalScrollExtent() {
return getWidth();
}
/**
* <p>Compute the vertical range that the vertical scrollbar represents.</p>
*
* <p>The range is expressed in arbitrary units that must be the same as the
* units used by {@link #computeVerticalScrollExtent()} and
* {@link #computeVerticalScrollOffset()}.</p>
*
* @return the total vertical range represented by the vertical scrollbar
*
* <p>The default range is the drawing height of this view.</p>
*
* @see #computeVerticalScrollExtent()
* @see #computeVerticalScrollOffset()
* @see android.widget.ScrollBarDrawable
*/
protected int computeVerticalScrollRange() {
return getHeight();
}
/**
* <p>Compute the vertical offset of the vertical scrollbar's thumb
* within the horizontal range. This value is used to compute the position
* of the thumb within the scrollbar's track.</p>
*
* <p>The range is expressed in arbitrary units that must be the same as the
* units used by {@link #computeVerticalScrollRange()} and
* {@link #computeVerticalScrollExtent()}.</p>
*
* <p>The default offset is the scroll offset of this view.</p>
*
* @return the vertical offset of the scrollbar's thumb
*
* @see #computeVerticalScrollRange()
* @see #computeVerticalScrollExtent()
* @see android.widget.ScrollBarDrawable
*/
protected int computeVerticalScrollOffset() {
return mScrollY;
}
/**
* <p>Compute the vertical extent of the vertical scrollbar's thumb
* within the vertical range. This value is used to compute the length
* of the thumb within the scrollbar's track.</p>
*
* <p>The range is expressed in arbitrary units that must be the same as the
* units used by {@link #computeVerticalScrollRange()} and
* {@link #computeVerticalScrollOffset()}.</p>
*
* <p>The default extent is the drawing height of this view.</p>
*
* @return the vertical extent of the scrollbar's thumb
*
* @see #computeVerticalScrollRange()
* @see #computeVerticalScrollOffset()
* @see android.widget.ScrollBarDrawable
*/
protected int computeVerticalScrollExtent() {
return getHeight();
}
/**
* Check if this view can be scrolled horizontally in a certain direction.
*
* @param direction Negative to check scrolling left, positive to check scrolling right.
* @return true if this view can be scrolled in the specified direction, false otherwise.
*/
public boolean canScrollHorizontally(int direction) {
final int offset = computeHorizontalScrollOffset();
final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent();
if (range == 0) return false;
if (direction < 0) {
return offset > 0;
} else {
return offset < range - 1;
}
}
/**
* Check if this view can be scrolled vertically in a certain direction.
*
* @param direction Negative to check scrolling up, positive to check scrolling down.
* @return true if this view can be scrolled in the specified direction, false otherwise.
*/
public boolean canScrollVertically(int direction) {
final int offset = computeVerticalScrollOffset();
final int range = computeVerticalScrollRange() - computeVerticalScrollExtent();
if (range == 0) return false;
if (direction < 0) {
return offset > 0;
} else {
return offset < range - 1;
}
}
void getScrollIndicatorBounds(@NonNull Rect out) {
out.left = mScrollX;
out.right = mScrollX + mRight - mLeft;
out.top = mScrollY;
out.bottom = mScrollY + mBottom - mTop;
}
private void onDrawScrollIndicators(Canvas c) {
if ((mPrivateFlags3 & SCROLL_INDICATORS_PFLAG3_MASK) == 0) {
// No scroll indicators enabled.
return;
}
final Drawable dr = mScrollIndicatorDrawable;
if (dr == null) {
// Scroll indicators aren't supported here.
return;
}
final int h = dr.getIntrinsicHeight();
final int w = dr.getIntrinsicWidth();
final Rect rect = mAttachInfo.mTmpInvalRect;
getScrollIndicatorBounds(rect);
if ((mPrivateFlags3 & PFLAG3_SCROLL_INDICATOR_TOP) != 0) {
final boolean canScrollUp = canScrollVertically(-1);
if (canScrollUp) {
dr.setBounds(rect.left, rect.top, rect.right, rect.top + h);
dr.draw(c);
}
}
if ((mPrivateFlags3 & PFLAG3_SCROLL_INDICATOR_BOTTOM) != 0) {
final boolean canScrollDown = canScrollVertically(1);
if (canScrollDown) {
dr.setBounds(rect.left, rect.bottom - h, rect.right, rect.bottom);
dr.draw(c);
}
}
final int leftRtl;
final int rightRtl;
if (getLayoutDirection() == LAYOUT_DIRECTION_RTL) {
leftRtl = PFLAG3_SCROLL_INDICATOR_END;
rightRtl = PFLAG3_SCROLL_INDICATOR_START;
} else {
leftRtl = PFLAG3_SCROLL_INDICATOR_START;
rightRtl = PFLAG3_SCROLL_INDICATOR_END;
}
final int leftMask = PFLAG3_SCROLL_INDICATOR_LEFT | leftRtl;
if ((mPrivateFlags3 & leftMask) != 0) {
final boolean canScrollLeft = canScrollHorizontally(-1);
if (canScrollLeft) {
dr.setBounds(rect.left, rect.top, rect.left + w, rect.bottom);
dr.draw(c);
}
}
final int rightMask = PFLAG3_SCROLL_INDICATOR_RIGHT | rightRtl;
if ((mPrivateFlags3 & rightMask) != 0) {
final boolean canScrollRight = canScrollHorizontally(1);
if (canScrollRight) {
dr.setBounds(rect.right - w, rect.top, rect.right, rect.bottom);
dr.draw(c);
}
}
}
private void getHorizontalScrollBarBounds(Rect bounds) {
final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
final boolean drawVerticalScrollBar = isVerticalScrollBarEnabled()
&& !isVerticalScrollBarHidden();
final int size = getHorizontalScrollbarHeight();
final int verticalScrollBarGap = drawVerticalScrollBar ?
getVerticalScrollbarWidth() : 0;
final int width = mRight - mLeft;
final int height = mBottom - mTop;
bounds.top = mScrollY + height - size - (mUserPaddingBottom & inside);
bounds.left = mScrollX + (mPaddingLeft & inside);
bounds.right = mScrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap;
bounds.bottom = bounds.top + size;
}
private void getVerticalScrollBarBounds(Rect bounds) {
if (mRoundScrollbarRenderer == null) {
getStraightVerticalScrollBarBounds(bounds);
} else {
getRoundVerticalScrollBarBounds(bounds);
}
}
private void getRoundVerticalScrollBarBounds(Rect bounds) {
final int width = mRight - mLeft;
final int height = mBottom - mTop;
// Do not take padding into account as we always want the scrollbars
// to hug the screen for round wearable devices.
bounds.left = mScrollX;
bounds.top = mScrollY;
bounds.right = bounds.left + width;
bounds.bottom = mScrollY + height;
}
private void getStraightVerticalScrollBarBounds(Rect bounds) {
final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
final int size = getVerticalScrollbarWidth();
int verticalScrollbarPosition = mVerticalScrollbarPosition;
if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) {
verticalScrollbarPosition = isLayoutRtl() ?
SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT;
}
final int width = mRight - mLeft;
final int height = mBottom - mTop;
switch (verticalScrollbarPosition) {
default:
case SCROLLBAR_POSITION_RIGHT:
bounds.left = mScrollX + width - size - (mUserPaddingRight & inside);
break;
case SCROLLBAR_POSITION_LEFT:
bounds.left = mScrollX + (mUserPaddingLeft & inside);
break;
}
bounds.top = mScrollY + (mPaddingTop & inside);
bounds.right = bounds.left + size;
bounds.bottom = mScrollY + height - (mUserPaddingBottom & inside);
}
/**
* <p>Request the drawing of the horizontal and the vertical scrollbar. The
* scrollbars are painted only if they have been awakened first.</p>
*
* @param canvas the canvas on which to draw the scrollbars
*
* @see #awakenScrollBars(int)
*/
protected final void onDrawScrollBars(Canvas canvas) {
// scrollbars are drawn only when the animation is running
final ScrollabilityCache cache = mScrollCache;
if (cache != null) {
int state = cache.state;
if (state == ScrollabilityCache.OFF) {
return;
}
boolean invalidate = false;
if (state == ScrollabilityCache.FADING) {
// We're fading -- get our fade interpolation
if (cache.interpolatorValues == null) {
cache.interpolatorValues = new float[1];
}
float[] values = cache.interpolatorValues;
// Stops the animation if we're done
if (cache.scrollBarInterpolator.timeToValues(values) ==
Interpolator.Result.FREEZE_END) {
cache.state = ScrollabilityCache.OFF;
} else {
cache.scrollBar.mutate().setAlpha(Math.round(values[0]));
}
// This will make the scroll bars inval themselves after
// drawing. We only want this when we're fading so that
// we prevent excessive redraws
invalidate = true;
} else {
// We're just on -- but we may have been fading before so
// reset alpha
cache.scrollBar.mutate().setAlpha(255);
}
final boolean drawHorizontalScrollBar = isHorizontalScrollBarEnabled();
final boolean drawVerticalScrollBar = isVerticalScrollBarEnabled()
&& !isVerticalScrollBarHidden();
// Fork out the scroll bar drawing for round wearable devices.
if (mRoundScrollbarRenderer != null) {
if (drawVerticalScrollBar) {
final Rect bounds = cache.mScrollBarBounds;
getVerticalScrollBarBounds(bounds);
mRoundScrollbarRenderer.drawRoundScrollbars(
canvas, (float) cache.scrollBar.getAlpha() / 255f, bounds);
if (invalidate) {
invalidate();
}
}
// Do not draw horizontal scroll bars for round wearable devices.
} else if (drawVerticalScrollBar || drawHorizontalScrollBar) {
final ScrollBarDrawable scrollBar = cache.scrollBar;
if (drawHorizontalScrollBar) {
scrollBar.setParameters(computeHorizontalScrollRange(),
computeHorizontalScrollOffset(),
computeHorizontalScrollExtent(), false);
final Rect bounds = cache.mScrollBarBounds;
getHorizontalScrollBarBounds(bounds);
onDrawHorizontalScrollBar(canvas, scrollBar, bounds.left, bounds.top,
bounds.right, bounds.bottom);
if (invalidate) {
invalidate(bounds);
}
}
if (drawVerticalScrollBar) {
scrollBar.setParameters(computeVerticalScrollRange(),
computeVerticalScrollOffset(),
computeVerticalScrollExtent(), true);
final Rect bounds = cache.mScrollBarBounds;
getVerticalScrollBarBounds(bounds);
onDrawVerticalScrollBar(canvas, scrollBar, bounds.left, bounds.top,
bounds.right, bounds.bottom);
if (invalidate) {
invalidate(bounds);
}
}
}
}
}
/**
* Override this if the vertical scrollbar needs to be hidden in a subclass, like when
* FastScroller is visible.
* @return whether to temporarily hide the vertical scrollbar
* @hide
*/
protected boolean isVerticalScrollBarHidden() {
return false;
}
/**
* <p>Draw the horizontal scrollbar if
* {@link #isHorizontalScrollBarEnabled()} returns true.</p>
*
* @param canvas the canvas on which to draw the scrollbar
* @param scrollBar the scrollbar's drawable
*
* @see #isHorizontalScrollBarEnabled()
* @see #computeHorizontalScrollRange()
* @see #computeHorizontalScrollExtent()
* @see #computeHorizontalScrollOffset()
* @see android.widget.ScrollBarDrawable
* @hide
*/
protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar,
int l, int t, int r, int b) {
scrollBar.setBounds(l, t, r, b);
scrollBar.draw(canvas);
}
/**
* <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()}
* returns true.</p>
*
* @param canvas the canvas on which to draw the scrollbar
* @param scrollBar the scrollbar's drawable
*
* @see #isVerticalScrollBarEnabled()
* @see #computeVerticalScrollRange()
* @see #computeVerticalScrollExtent()
* @see #computeVerticalScrollOffset()
* @see android.widget.ScrollBarDrawable
* @hide
*/
protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar,
int l, int t, int r, int b) {
scrollBar.setBounds(l, t, r, b);
scrollBar.draw(canvas);
}
/**
* Implement this to do your drawing.
*
* @param canvas the canvas on which the background will be drawn
*/
protected void onDraw(Canvas canvas) {
}
/*
* Caller is responsible for calling requestLayout if necessary.
* (This allows addViewInLayout to not request a new layout.)
*/
void assignParent(ViewParent parent) {
if (mParent == null) {
mParent = parent;
} else if (parent == null) {
mParent = null;
} else {
throw new RuntimeException("view " + this + " being added, but"
+ " it already has a parent");
}
}
/**
* This is called when the view is attached to a window. At this point it
* has a Surface and will start drawing. Note that this function is
* guaranteed to be called before {@link #onDraw(android.graphics.Canvas)},
* however it may be called any time before the first onDraw -- including
* before or after {@link #onMeasure(int, int)}.
*
* @see #onDetachedFromWindow()
*/
@CallSuper
protected void onAttachedToWindow() {
if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) {
mParent.requestTransparentRegion(this);
}
mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT;
jumpDrawablesToCurrentState();
resetSubtreeAccessibilityStateChanged();
// rebuild, since Outline not maintained while View is detached
rebuildOutline();
if (isFocused()) {
InputMethodManager imm = InputMethodManager.peekInstance();
if (imm != null) {
imm.focusIn(this);
}
}
}
/**
* Resolve all RTL related properties.
*
* @return true if resolution of RTL properties has been done
*
* @hide
*/
public boolean resolveRtlPropertiesIfNeeded() {
if (!needRtlPropertiesResolution()) return false;
// Order is important here: LayoutDirection MUST be resolved first
if (!isLayoutDirectionResolved()) {
resolveLayoutDirection();
resolveLayoutParams();
}
// ... then we can resolve the others properties depending on the resolved LayoutDirection.
if (!isTextDirectionResolved()) {
resolveTextDirection();
}
if (!isTextAlignmentResolved()) {
resolveTextAlignment();
}
// Should resolve Drawables before Padding because we need the layout direction of the
// Drawable to correctly resolve Padding.
if (!areDrawablesResolved()) {
resolveDrawables();
}
if (!isPaddingResolved()) {
resolvePadding();
}
onRtlPropertiesChanged(getLayoutDirection());
return true;
}
/**
* Reset resolution of all RTL related properties.
*
* @hide
*/
public void resetRtlProperties() {
resetResolvedLayoutDirection();
resetResolvedTextDirection();
resetResolvedTextAlignment();
resetResolvedPadding();
resetResolvedDrawables();
}
/**
* @see #onScreenStateChanged(int)
*/
void dispatchScreenStateChanged(int screenState) {
onScreenStateChanged(screenState);
}
/**
* This method is called whenever the state of the screen this view is
* attached to changes. A state change will usually occurs when the screen
* turns on or off (whether it happens automatically or the user does it
* manually.)
*
* @param screenState The new state of the screen. Can be either
* {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF}
*/
public void onScreenStateChanged(int screenState) {
}
/**
* Return true if the application tag in the AndroidManifest has set "supportRtl" to true
*/
private boolean hasRtlSupport() {
return mContext.getApplicationInfo().hasRtlSupport();
}
/**
* Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or
* RTL not supported)
*/
private boolean isRtlCompatibilityMode() {
final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion;
return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport();
}
/**
* @return true if RTL properties need resolution.
*
*/
private boolean needRtlPropertiesResolution() {
return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED;
}
/**
* Called when any RTL property (layout direction or text direction or text alignment) has
* been changed.
*
* Subclasses need to override this method to take care of cached information that depends on the
* resolved layout direction, or to inform child views that inherit their layout direction.
*
* The default implementation does nothing.
*
* @param layoutDirection the direction of the layout
*
* @see #LAYOUT_DIRECTION_LTR
* @see #LAYOUT_DIRECTION_RTL
*/
public void onRtlPropertiesChanged(@ResolvedLayoutDir int layoutDirection) {
}
/**
* Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing
* that the parent directionality can and will be resolved before its children.
*
* @return true if resolution has been done, false otherwise.
*
* @hide
*/
public boolean resolveLayoutDirection() {
// Clear any previous layout direction resolution
mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK;
if (hasRtlSupport()) {
// Set resolved depending on layout direction
switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >>
PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) {
case LAYOUT_DIRECTION_INHERIT:
// We cannot resolve yet. LTR is by default and let the resolution happen again
// later to get the correct resolved value
if (!canResolveLayoutDirection()) return false;
// Parent has not yet resolved, LTR is still the default
try {
if (!mParent.isLayoutDirectionResolved()) return false;
if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) {
mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
}
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
}
break;
case LAYOUT_DIRECTION_RTL:
mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
break;
case LAYOUT_DIRECTION_LOCALE:
if((LAYOUT_DIRECTION_RTL ==
TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) {
mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL;
}
break;
default:
// Nothing to do, LTR by default
}
}
// Set to resolved
mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED;
return true;
}
/**
* Check if layout direction resolution can be done.
*
* @return true if layout direction resolution can be done otherwise return false.
*/
public boolean canResolveLayoutDirection() {
switch (getRawLayoutDirection()) {
case LAYOUT_DIRECTION_INHERIT:
if (mParent != null) {
try {
return mParent.canResolveLayoutDirection();
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
}
}
return false;
default:
return true;
}
}
/**
* Reset the resolved layout direction. Layout direction will be resolved during a call to
* {@link #onMeasure(int, int)}.
*
* @hide
*/
public void resetResolvedLayoutDirection() {
// Reset the current resolved bits
mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK;
}
/**
* @return true if the layout direction is inherited.
*
* @hide
*/
public boolean isLayoutDirectionInherited() {
return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT);
}
/**
* @return true if layout direction has been resolved.
*/
public boolean isLayoutDirectionResolved() {
return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED;
}
/**
* Return if padding has been resolved
*
* @hide
*/
boolean isPaddingResolved() {
return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED;
}
/**
* Resolves padding depending on layout direction, if applicable, and
* recomputes internal padding values to adjust for scroll bars.
*
* @hide
*/
public void resolvePadding() {
final int resolvedLayoutDirection = getLayoutDirection();
if (!isRtlCompatibilityMode()) {
// Post Jelly Bean MR1 case: we need to take the resolved layout direction into account.
// If start / end padding are defined, they will be resolved (hence overriding) to
// left / right or right / left depending on the resolved layout direction.
// If start / end padding are not defined, use the left / right ones.
if (mBackground != null && (!mLeftPaddingDefined || !mRightPaddingDefined)) {
Rect padding = sThreadLocal.get();
if (padding == null) {
padding = new Rect();
sThreadLocal.set(padding);
}
mBackground.getPadding(padding);
if (!mLeftPaddingDefined) {
mUserPaddingLeftInitial = padding.left;
}
if (!mRightPaddingDefined) {
mUserPaddingRightInitial = padding.right;
}
}
switch (resolvedLayoutDirection) {
case LAYOUT_DIRECTION_RTL:
if (mUserPaddingStart != UNDEFINED_PADDING) {
mUserPaddingRight = mUserPaddingStart;
} else {
mUserPaddingRight = mUserPaddingRightInitial;
}
if (mUserPaddingEnd != UNDEFINED_PADDING) {
mUserPaddingLeft = mUserPaddingEnd;
} else {
mUserPaddingLeft = mUserPaddingLeftInitial;
}
break;
case LAYOUT_DIRECTION_LTR:
default:
if (mUserPaddingStart != UNDEFINED_PADDING) {
mUserPaddingLeft = mUserPaddingStart;
} else {
mUserPaddingLeft = mUserPaddingLeftInitial;
}
if (mUserPaddingEnd != UNDEFINED_PADDING) {
mUserPaddingRight = mUserPaddingEnd;
} else {
mUserPaddingRight = mUserPaddingRightInitial;
}
}
mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom;
}
internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom);
onRtlPropertiesChanged(resolvedLayoutDirection);
mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED;
}
/**
* Reset the resolved layout direction.
*
* @hide
*/
public void resetResolvedPadding() {
resetResolvedPaddingInternal();
}
/**
* Used when we only want to reset *this* view's padding and not trigger overrides
* in ViewGroup that reset children too.
*/
void resetResolvedPaddingInternal() {
mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED;
}
/**
* This is called when the view is detached from a window. At this point it
* no longer has a surface for drawing.
*
* @see #onAttachedToWindow()
*/
@CallSuper
protected void onDetachedFromWindow() {
}
/**
* This is a framework-internal mirror of onDetachedFromWindow() that's called
* after onDetachedFromWindow().
*
* If you override this you *MUST* call super.onDetachedFromWindowInternal()!
* The super method should be called at the end of the overridden method to ensure
* subclasses are destroyed first
*
* @hide
*/
@CallSuper
protected void onDetachedFromWindowInternal() {
mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT;
mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT;
mPrivateFlags3 &= ~PFLAG3_TEMPORARY_DETACH;
removeUnsetPressCallback();
removeLongPressCallback();
removePerformClickCallback();
removeSendViewScrolledAccessibilityEventCallback();
stopNestedScroll();
// Anything that started animating right before detach should already
// be in its final state when re-attached.
jumpDrawablesToCurrentState();
destroyDrawingCache();
cleanupDraw();
mCurrentAnimation = null;
}
private void cleanupDraw() {
resetDisplayList();
if (mAttachInfo != null) {
mAttachInfo.mViewRootImpl.cancelInvalidate(this);
}
}
void invalidateInheritedLayoutMode(int layoutModeOfRoot) {
}
/**
* @return The number of times this view has been attached to a window
*/
protected int getWindowAttachCount() {
return mWindowAttachCount;
}
/**
* Retrieve a unique token identifying the window this view is attached to.
* @return Return the window's token for use in
* {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}.
*/
public IBinder getWindowToken() {
return mAttachInfo != null ? mAttachInfo.mWindowToken : null;
}
/**
* Retrieve the {@link WindowId} for the window this view is
* currently attached to.
*/
public WindowId getWindowId() {
if (mAttachInfo == null) {
return null;
}
if (mAttachInfo.mWindowId == null) {
try {
mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId(
mAttachInfo.mWindowToken);
mAttachInfo.mWindowId = new WindowId(
mAttachInfo.mIWindowId);
} catch (RemoteException e) {
}
}
return mAttachInfo.mWindowId;
}
/**
* Retrieve a unique token identifying the top-level "real" window of
* the window that this view is attached to. That is, this is like
* {@link #getWindowToken}, except if the window this view in is a panel
* window (attached to another containing window), then the token of
* the containing window is returned instead.
*
* @return Returns the associated window token, either
* {@link #getWindowToken()} or the containing window's token.
*/
public IBinder getApplicationWindowToken() {
AttachInfo ai = mAttachInfo;
if (ai != null) {
IBinder appWindowToken = ai.mPanelParentWindowToken;
if (appWindowToken == null) {
appWindowToken = ai.mWindowToken;
}
return appWindowToken;
}
return null;
}
/**
* Gets the logical display to which the view's window has been attached.
*
* @return The logical display, or null if the view is not currently attached to a window.
*/
public Display getDisplay() {
return mAttachInfo != null ? mAttachInfo.mDisplay : null;
}
/**
* Retrieve private session object this view hierarchy is using to
* communicate with the window manager.
* @return the session object to communicate with the window manager
*/
/*package*/ IWindowSession getWindowSession() {
return mAttachInfo != null ? mAttachInfo.mSession : null;
}
/**
* Return the visibility value of the least visible component passed.
*/
int combineVisibility(int vis1, int vis2) {
// This works because VISIBLE < INVISIBLE < GONE.
return Math.max(vis1, vis2);
}
/**
* @param info the {@link android.view.View.AttachInfo} to associated with
* this view
*/
void dispatchAttachedToWindow(AttachInfo info, int visibility) {
mAttachInfo = info;
if (mOverlay != null) {
mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility);
}
mWindowAttachCount++;
// We will need to evaluate the drawable state at least once.
mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY;
if (mFloatingTreeObserver != null) {
info.mTreeObserver.merge(mFloatingTreeObserver);
mFloatingTreeObserver = null;
}
registerPendingFrameMetricsObservers();
if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) {
mAttachInfo.mScrollContainers.add(this);
mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED;
}
// Transfer all pending runnables.
if (mRunQueue != null) {
mRunQueue.executeActions(info.mHandler);
mRunQueue = null;
}
performCollectViewAttributes(mAttachInfo, visibility);
onAttachedToWindow();
ListenerInfo li = mListenerInfo;
final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners =
li != null ? li.mOnAttachStateChangeListeners : null;
if (listeners != null && listeners.size() > 0) {
// NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to
// perform the dispatching. The iterator is a safe guard against listeners that
// could mutate the list by calling the various add/remove methods. This prevents
// the array from being modified while we iterate it.
for (OnAttachStateChangeListener listener : listeners) {
listener.onViewAttachedToWindow(this);
}
}
int vis = info.mWindowVisibility;
if (vis != GONE) {
onWindowVisibilityChanged(vis);
if (isShown()) {
// Calling onVisibilityAggregated directly here since the subtree will also
// receive dispatchAttachedToWindow and this same call
onVisibilityAggregated(vis == VISIBLE);
}
}
// Send onVisibilityChanged directly instead of dispatchVisibilityChanged.
// As all views in the subtree will already receive dispatchAttachedToWindow
// traversing the subtree again here is not desired.
onVisibilityChanged(this, visibility);
if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) {
// If nobody has evaluated the drawable state yet, then do it now.
refreshDrawableState();
}
needGlobalAttributesUpdate(false);
}
void dispatchDetachedFromWindow() {
AttachInfo info = mAttachInfo;
if (info != null) {
int vis = info.mWindowVisibility;
if (vis != GONE) {
onWindowVisibilityChanged(GONE);
if (isShown()) {
// Invoking onVisibilityAggregated directly here since the subtree
// will also receive detached from window
onVisibilityAggregated(false);
}
}
}
onDetachedFromWindow();
onDetachedFromWindowInternal();
InputMethodManager imm = InputMethodManager.peekInstance();
if (imm != null) {
imm.onViewDetachedFromWindow(this);
}
ListenerInfo li = mListenerInfo;
final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners =
li != null ? li.mOnAttachStateChangeListeners : null;
if (listeners != null && listeners.size() > 0) {
// NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to
// perform the dispatching. The iterator is a safe guard against listeners that
// could mutate the list by calling the various add/remove methods. This prevents
// the array from being modified while we iterate it.
for (OnAttachStateChangeListener listener : listeners) {
listener.onViewDetachedFromWindow(this);
}
}
if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) {
mAttachInfo.mScrollContainers.remove(this);
mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED;
}
mAttachInfo = null;
if (mOverlay != null) {
mOverlay.getOverlayView().dispatchDetachedFromWindow();
}
}
/**
* Cancel any deferred high-level input events that were previously posted to the event queue.
*
* <p>Many views post high-level events such as click handlers to the event queue
* to run deferred in order to preserve a desired user experience - clearing visible
* pressed states before executing, etc. This method will abort any events of this nature
* that are currently in flight.</p>
*
* <p>Custom views that generate their own high-level deferred input events should override
* {@link #onCancelPendingInputEvents()} and remove those pending events from the queue.</p>
*
* <p>This will also cancel pending input events for any child views.</p>
*
* <p>Note that this may not be sufficient as a debouncing strategy for clicks in all cases.
* This will not impact newer events posted after this call that may occur as a result of
* lower-level input events still waiting in the queue. If you are trying to prevent
* double-submitted events for the duration of some sort of asynchronous transaction
* you should also take other steps to protect against unexpected double inputs e.g. calling
* {@link #setEnabled(boolean) setEnabled(false)} and re-enabling the view when
* the transaction completes, tracking already submitted transaction IDs, etc.</p>
*/
public final void cancelPendingInputEvents() {
dispatchCancelPendingInputEvents();
}
/**
* Called by {@link #cancelPendingInputEvents()} to cancel input events in flight.
* Overridden by ViewGroup to dispatch. Package scoped to prevent app-side meddling.
*/
void dispatchCancelPendingInputEvents() {
mPrivateFlags3 &= ~PFLAG3_CALLED_SUPER;
onCancelPendingInputEvents();
if ((mPrivateFlags3 & PFLAG3_CALLED_SUPER) != PFLAG3_CALLED_SUPER) {
throw new SuperNotCalledException("View " + getClass().getSimpleName() +
" did not call through to super.onCancelPendingInputEvents()");
}
}
/**
* Called as the result of a call to {@link #cancelPendingInputEvents()} on this view or
* a parent view.
*
* <p>This method is responsible for removing any pending high-level input events that were
* posted to the event queue to run later. Custom view classes that post their own deferred
* high-level events via {@link #post(Runnable)}, {@link #postDelayed(Runnable, long)} or
* {@link android.os.Handler} should override this method, call
* <code>super.onCancelPendingInputEvents()</code> and remove those callbacks as appropriate.
* </p>
*/
public void onCancelPendingInputEvents() {
removePerformClickCallback();
cancelLongPress();
mPrivateFlags3 |= PFLAG3_CALLED_SUPER;
}
/**
* Store this view hierarchy's frozen state into the given container.
*
* @param container The SparseArray in which to save the view's state.
*
* @see #restoreHierarchyState(android.util.SparseArray)
* @see #dispatchSaveInstanceState(android.util.SparseArray)
* @see #onSaveInstanceState()
*/
public void saveHierarchyState(SparseArray<Parcelable> container) {
dispatchSaveInstanceState(container);
}
/**
* Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for
* this view and its children. May be overridden to modify how freezing happens to a
* view's children; for example, some views may want to not store state for their children.
*
* @param container The SparseArray in which to save the view's state.
*
* @see #dispatchRestoreInstanceState(android.util.SparseArray)
* @see #saveHierarchyState(android.util.SparseArray)
* @see #onSaveInstanceState()
*/
protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) {
mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED;
Parcelable state = onSaveInstanceState();
if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) {
throw new IllegalStateException(
"Derived class did not call super.onSaveInstanceState()");
}
if (state != null) {
// Log.i("View", "Freezing #" + Integer.toHexString(mID)
// + ": " + state);
container.put(mID, state);
}
}
}
/**
* Hook allowing a view to generate a representation of its internal state
* that can later be used to create a new instance with that same state.
* This state should only contain information that is not persistent or can
* not be reconstructed later. For example, you will never store your
* current position on screen because that will be computed again when a
* new instance of the view is placed in its view hierarchy.
* <p>
* Some examples of things you may store here: the current cursor position
* in a text view (but usually not the text itself since that is stored in a
* content provider or other persistent storage), the currently selected
* item in a list view.
*
* @return Returns a Parcelable object containing the view's current dynamic
* state, or null if there is nothing interesting to save. The
* default implementation returns null.
* @see #onRestoreInstanceState(android.os.Parcelable)
* @see #saveHierarchyState(android.util.SparseArray)
* @see #dispatchSaveInstanceState(android.util.SparseArray)
* @see #setSaveEnabled(boolean)
*/
@CallSuper
protected Parcelable onSaveInstanceState() {
mPrivateFlags |= PFLAG_SAVE_STATE_CALLED;
if (mStartActivityRequestWho != null) {
BaseSavedState state = new BaseSavedState(AbsSavedState.EMPTY_STATE);
state.mStartActivityRequestWhoSaved = mStartActivityRequestWho;
return state;
}
return BaseSavedState.EMPTY_STATE;
}
/**
* Restore this view hierarchy's frozen state from the given container.
*
* @param container The SparseArray which holds previously frozen states.
*
* @see #saveHierarchyState(android.util.SparseArray)
* @see #dispatchRestoreInstanceState(android.util.SparseArray)
* @see #onRestoreInstanceState(android.os.Parcelable)
*/
public void restoreHierarchyState(SparseArray<Parcelable> container) {
dispatchRestoreInstanceState(container);
}
/**
* Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the
* state for this view and its children. May be overridden to modify how restoring
* happens to a view's children; for example, some views may want to not store state
* for their children.
*
* @param container The SparseArray which holds previously saved state.
*
* @see #dispatchSaveInstanceState(android.util.SparseArray)
* @see #restoreHierarchyState(android.util.SparseArray)
* @see #onRestoreInstanceState(android.os.Parcelable)
*/
protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
if (mID != NO_ID) {
Parcelable state = container.get(mID);
if (state != null) {
// Log.i("View", "Restoreing #" + Integer.toHexString(mID)
// + ": " + state);
mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED;
onRestoreInstanceState(state);
if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) {
throw new IllegalStateException(
"Derived class did not call super.onRestoreInstanceState()");
}
}
}
}
/**
* Hook allowing a view to re-apply a representation of its internal state that had previously
* been generated by {@link #onSaveInstanceState}. This function will never be called with a
* null state.
*
* @param state The frozen state that had previously been returned by
* {@link #onSaveInstanceState}.
*
* @see #onSaveInstanceState()
* @see #restoreHierarchyState(android.util.SparseArray)
* @see #dispatchRestoreInstanceState(android.util.SparseArray)
*/
@CallSuper
protected void onRestoreInstanceState(Parcelable state) {
mPrivateFlags |= PFLAG_SAVE_STATE_CALLED;
if (state != null && !(state instanceof AbsSavedState)) {
throw new IllegalArgumentException("Wrong state class, expecting View State but "
+ "received " + state.getClass().toString() + " instead. This usually happens "
+ "when two views of different type have the same id in the same hierarchy. "
+ "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure "
+ "other views do not use the same id.");
}
if (state != null && state instanceof BaseSavedState) {
mStartActivityRequestWho = ((BaseSavedState) state).mStartActivityRequestWhoSaved;
}
}
/**
* <p>Return the time at which the drawing of the view hierarchy started.</p>
*
* @return the drawing start time in milliseconds
*/
public long getDrawingTime() {
return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0;
}
/**
* <p>Enables or disables the duplication of the parent's state into this view. When
* duplication is enabled, this view gets its drawable state from its parent rather
* than from its own internal properties.</p>
*
* <p>Note: in the current implementation, setting this property to true after the
* view was added to a ViewGroup might have no effect at all. This property should
* always be used from XML or set to true before adding this view to a ViewGroup.</p>
*
* <p>Note: if this view's parent addStateFromChildren property is enabled and this
* property is enabled, an exception will be thrown.</p>
*
* <p>Note: if the child view uses and updates additional states which are unknown to the
* parent, these states should not be affected by this method.</p>
*
* @param enabled True to enable duplication of the parent's drawable state, false
* to disable it.
*
* @see #getDrawableState()
* @see #isDuplicateParentStateEnabled()
*/
public void setDuplicateParentStateEnabled(boolean enabled) {
setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE);
}
/**
* <p>Indicates whether this duplicates its drawable state from its parent.</p>
*
* @return True if this view's drawable state is duplicated from the parent,
* false otherwise
*
* @see #getDrawableState()
* @see #setDuplicateParentStateEnabled(boolean)
*/
public boolean isDuplicateParentStateEnabled() {
return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE;
}
/**
* <p>Specifies the type of layer backing this view. The layer can be
* {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
* {@link #LAYER_TYPE_HARDWARE}.</p>
*
* <p>A layer is associated with an optional {@link android.graphics.Paint}
* instance that controls how the layer is composed on screen. The following
* properties of the paint are taken into account when composing the layer:</p>
* <ul>
* <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li>
* <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li>
* <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li>
* </ul>
*
* <p>If this view has an alpha value set to < 1.0 by calling
* {@link #setAlpha(float)}, the alpha value of the layer's paint is superseded
* by this view's alpha value.</p>
*
* <p>Refer to the documentation of {@link #LAYER_TYPE_NONE},
* {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE}
* for more information on when and how to use layers.</p>
*
* @param layerType The type of layer to use with this view, must be one of
* {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
* {@link #LAYER_TYPE_HARDWARE}
* @param paint The paint used to compose the layer. This argument is optional
* and can be null. It is ignored when the layer type is
* {@link #LAYER_TYPE_NONE}
*
* @see #getLayerType()
* @see #LAYER_TYPE_NONE
* @see #LAYER_TYPE_SOFTWARE
* @see #LAYER_TYPE_HARDWARE
* @see #setAlpha(float)
*
* @attr ref android.R.styleable#View_layerType
*/
public void setLayerType(int layerType, @Nullable Paint paint) {
if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) {
throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, "
+ "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE");
}
boolean typeChanged = mRenderNode.setLayerType(layerType);
if (!typeChanged) {
setLayerPaint(paint);
return;
}
if (layerType != LAYER_TYPE_SOFTWARE) {
// Destroy any previous software drawing cache if present
// NOTE: even if previous layer type is HW, we do this to ensure we've cleaned up
// drawing cache created in View#draw when drawing to a SW canvas.
destroyDrawingCache();
}
mLayerType = layerType;
mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : paint;
mRenderNode.setLayerPaint(mLayerPaint);
// draw() behaves differently if we are on a layer, so we need to
// invalidate() here
invalidateParentCaches();
invalidate(true);
}
/**
* Updates the {@link Paint} object used with the current layer (used only if the current
* layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint
* provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time
* the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to
* ensure that the view gets redrawn immediately.
*
* <p>A layer is associated with an optional {@link android.graphics.Paint}
* instance that controls how the layer is composed on screen. The following
* properties of the paint are taken into account when composing the layer:</p>
* <ul>
* <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li>
* <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li>
* <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li>
* </ul>
*
* <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the
* alpha value of the layer's paint is superseded by this view's alpha value.</p>
*
* @param paint The paint used to compose the layer. This argument is optional
* and can be null. It is ignored when the layer type is
* {@link #LAYER_TYPE_NONE}
*
* @see #setLayerType(int, android.graphics.Paint)
*/
public void setLayerPaint(@Nullable Paint paint) {
int layerType = getLayerType();
if (layerType != LAYER_TYPE_NONE) {
mLayerPaint = paint;
if (layerType == LAYER_TYPE_HARDWARE) {
if (mRenderNode.setLayerPaint(paint)) {
invalidateViewProperty(false, false);
}
} else {
invalidate();
}
}
}
/**
* Indicates what type of layer is currently associated with this view. By default
* a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}.
* Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)}
* for more information on the different types of layers.
*
* @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or
* {@link #LAYER_TYPE_HARDWARE}
*
* @see #setLayerType(int, android.graphics.Paint)
* @see #buildLayer()
* @see #LAYER_TYPE_NONE
* @see #LAYER_TYPE_SOFTWARE
* @see #LAYER_TYPE_HARDWARE
*/
public int getLayerType() {
return mLayerType;
}
/**
* Forces this view's layer to be created and this view to be rendered
* into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE},
* invoking this method will have no effect.
*
* This method can for instance be used to render a view into its layer before
* starting an animation. If this view is complex, rendering into the layer
* before starting the animation will avoid skipping frames.
*
* @throws IllegalStateException If this view is not attached to a window
*
* @see #setLayerType(int, android.graphics.Paint)
*/
public void buildLayer() {
if (mLayerType == LAYER_TYPE_NONE) return;
final AttachInfo attachInfo = mAttachInfo;
if (attachInfo == null) {
throw new IllegalStateException("This view must be attached to a window first");
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
switch (mLayerType) {
case LAYER_TYPE_HARDWARE:
updateDisplayListIfDirty();
if (attachInfo.mHardwareRenderer != null && mRenderNode.isValid()) {
attachInfo.mHardwareRenderer.buildLayer(mRenderNode);
}
break;
case LAYER_TYPE_SOFTWARE:
buildDrawingCache(true);
break;
}
}
/**
* Destroys all hardware rendering resources. This method is invoked
* when the system needs to reclaim resources. Upon execution of this
* method, you should free any OpenGL resources created by the view.
*
* Note: you <strong>must</strong> call
* <code>super.destroyHardwareResources()</code> when overriding
* this method.
*
* @hide
*/
@CallSuper
protected void destroyHardwareResources() {
// Although the Layer will be destroyed by RenderNode, we want to release
// the staging display list, which is also a signal to RenderNode that it's
// safe to free its copy of the display list as it knows that we will
// push an updated DisplayList if we try to draw again
resetDisplayList();
}
/**
* <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call
* to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a
* bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when
* the cache is enabled. To benefit from the cache, you must request the drawing cache by
* calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not
* null.</p>
*
* <p>Enabling the drawing cache is similar to
* {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware
* acceleration is turned off. When hardware acceleration is turned on, enabling the
* drawing cache has no effect on rendering because the system uses a different mechanism
* for acceleration which ignores the flag. If you want to use a Bitmap for the view, even
* when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)}
* for information on how to enable software and hardware layers.</p>
*
* <p>This API can be used to manually generate
* a bitmap copy of this view, by setting the flag to <code>true</code> and calling
* {@link #getDrawingCache()}.</p>
*
* @param enabled true to enable the drawing cache, false otherwise
*
* @see #isDrawingCacheEnabled()
* @see #getDrawingCache()
* @see #buildDrawingCache()
* @see #setLayerType(int, android.graphics.Paint)
*/
public void setDrawingCacheEnabled(boolean enabled) {
mCachingFailed = false;
setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED);
}
/**
* <p>Indicates whether the drawing cache is enabled for this view.</p>
*
* @return true if the drawing cache is enabled
*
* @see #setDrawingCacheEnabled(boolean)
* @see #getDrawingCache()
*/
@ViewDebug.ExportedProperty(category = "drawing")
public boolean isDrawingCacheEnabled() {
return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED;
}
/**
* Debugging utility which recursively outputs the dirty state of a view and its
* descendants.
*
* @hide
*/
@SuppressWarnings({"UnusedDeclaration"})
public void outputDirtyFlags(String indent, boolean clear, int clearMask) {
Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) +
") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" +
(mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) +
") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")");
if (clear) {
mPrivateFlags &= clearMask;
}
if (this instanceof ViewGroup) {
ViewGroup parent = (ViewGroup) this;
final int count = parent.getChildCount();
for (int i = 0; i < count; i++) {
final View child = parent.getChildAt(i);
child.outputDirtyFlags(indent + " ", clear, clearMask);
}
}
}
/**
* This method is used by ViewGroup to cause its children to restore or recreate their
* display lists. It is called by getDisplayList() when the parent ViewGroup does not need
* to recreate its own display list, which would happen if it went through the normal
* draw/dispatchDraw mechanisms.
*
* @hide
*/
protected void dispatchGetDisplayList() {}
/**
* A view that is not attached or hardware accelerated cannot create a display list.
* This method checks these conditions and returns the appropriate result.
*
* @return true if view has the ability to create a display list, false otherwise.
*
* @hide
*/
public boolean canHaveDisplayList() {
return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null);
}
/**
* Gets the RenderNode for the view, and updates its DisplayList (if needed and supported)
* @hide
*/
@NonNull
public RenderNode updateDisplayListIfDirty() {
final RenderNode renderNode = mRenderNode;
if (!canHaveDisplayList()) {
// can't populate RenderNode, don't try
return renderNode;
}
if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0
|| !renderNode.isValid()
|| (mRecreateDisplayList)) {
// Don't need to recreate the display list, just need to tell our
// children to restore/recreate theirs
if (renderNode.isValid()
&& !mRecreateDisplayList) {
mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
dispatchGetDisplayList();
return renderNode; // no work needed
}
// If we got here, we're recreating it. Mark it as such to ensure that
// we copy in child display lists into ours in drawChild()
mRecreateDisplayList = true;
int width = mRight - mLeft;
int height = mBottom - mTop;
int layerType = getLayerType();
final DisplayListCanvas canvas = renderNode.start(width, height);
canvas.setHighContrastText(mAttachInfo.mHighContrastText);
try {
if (layerType == LAYER_TYPE_SOFTWARE) {
buildDrawingCache(true);
Bitmap cache = getDrawingCache(true);
if (cache != null) {
canvas.drawBitmap(cache, 0, 0, mLayerPaint);
}
} else {
computeScroll();
canvas.translate(-mScrollX, -mScrollY);
mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
// Fast path for layouts with no backgrounds
if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
dispatchDraw(canvas);
if (mOverlay != null && !mOverlay.isEmpty()) {
mOverlay.getOverlayView().draw(canvas);
}
} else {
draw(canvas);
}
}
} finally {
renderNode.end(canvas);
setDisplayListProperties(renderNode);
}
} else {
mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID;
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
}
return renderNode;
}
private void resetDisplayList() {
if (mRenderNode.isValid()) {
mRenderNode.discardDisplayList();
}
if (mBackgroundRenderNode != null && mBackgroundRenderNode.isValid()) {
mBackgroundRenderNode.discardDisplayList();
}
}
/**
* Called when the passed RenderNode is removed from the draw tree
* @hide
*/
public void onRenderNodeDetached(RenderNode renderNode) {
}
/**
* <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p>
*
* @return A non-scaled bitmap representing this view or null if cache is disabled.
*
* @see #getDrawingCache(boolean)
*/
public Bitmap getDrawingCache() {
return getDrawingCache(false);
}
/**
* <p>Returns the bitmap in which this view drawing is cached. The returned bitmap
* is null when caching is disabled. If caching is enabled and the cache is not ready,
* this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not
* draw from the cache when the cache is enabled. To benefit from the cache, you must
* request the drawing cache by calling this method and draw it on screen if the
* returned bitmap is not null.</p>
*
* <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled,
* this method will create a bitmap of the same size as this view. Because this bitmap
* will be drawn scaled by the parent ViewGroup, the result on screen might show
* scaling artifacts. To avoid such artifacts, you should call this method by setting
* the auto scaling to true. Doing so, however, will generate a bitmap of a different
* size than the view. This implies that your application must be able to handle this
* size.</p>
*
* @param autoScale Indicates whether the generated bitmap should be scaled based on
* the current density of the screen when the application is in compatibility
* mode.
*
* @return A bitmap representing this view or null if cache is disabled.
*
* @see #setDrawingCacheEnabled(boolean)
* @see #isDrawingCacheEnabled()
* @see #buildDrawingCache(boolean)
* @see #destroyDrawingCache()
*/
public Bitmap getDrawingCache(boolean autoScale) {
if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) {
return null;
}
if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) {
buildDrawingCache(autoScale);
}
return autoScale ? mDrawingCache : mUnscaledDrawingCache;
}
/**
* <p>Frees the resources used by the drawing cache. If you call
* {@link #buildDrawingCache()} manually without calling
* {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
* should cleanup the cache with this method afterwards.</p>
*
* @see #setDrawingCacheEnabled(boolean)
* @see #buildDrawingCache()
* @see #getDrawingCache()
*/
public void destroyDrawingCache() {
if (mDrawingCache != null) {
mDrawingCache.recycle();
mDrawingCache = null;
}
if (mUnscaledDrawingCache != null) {
mUnscaledDrawingCache.recycle();
mUnscaledDrawingCache = null;
}
}
/**
* Setting a solid background color for the drawing cache's bitmaps will improve
* performance and memory usage. Note, though that this should only be used if this
* view will always be drawn on top of a solid color.
*
* @param color The background color to use for the drawing cache's bitmap
*
* @see #setDrawingCacheEnabled(boolean)
* @see #buildDrawingCache()
* @see #getDrawingCache()
*/
public void setDrawingCacheBackgroundColor(@ColorInt int color) {
if (color != mDrawingCacheBackgroundColor) {
mDrawingCacheBackgroundColor = color;
mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
}
}
/**
* @see #setDrawingCacheBackgroundColor(int)
*
* @return The background color to used for the drawing cache's bitmap
*/
@ColorInt
public int getDrawingCacheBackgroundColor() {
return mDrawingCacheBackgroundColor;
}
/**
* <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p>
*
* @see #buildDrawingCache(boolean)
*/
public void buildDrawingCache() {
buildDrawingCache(false);
}
/**
* <p>Forces the drawing cache to be built if the drawing cache is invalid.</p>
*
* <p>If you call {@link #buildDrawingCache()} manually without calling
* {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you
* should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p>
*
* <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled,
* this method will create a bitmap of the same size as this view. Because this bitmap
* will be drawn scaled by the parent ViewGroup, the result on screen might show
* scaling artifacts. To avoid such artifacts, you should call this method by setting
* the auto scaling to true. Doing so, however, will generate a bitmap of a different
* size than the view. This implies that your application must be able to handle this
* size.</p>
*
* <p>You should avoid calling this method when hardware acceleration is enabled. If
* you do not need the drawing cache bitmap, calling this method will increase memory
* usage and cause the view to be rendered in software once, thus negatively impacting
* performance.</p>
*
* @see #getDrawingCache()
* @see #destroyDrawingCache()
*/
public void buildDrawingCache(boolean autoScale) {
if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ?
mDrawingCache == null : mUnscaledDrawingCache == null)) {
if (Trace.isTagEnabled(Trace.TRACE_TAG_VIEW)) {
Trace.traceBegin(Trace.TRACE_TAG_VIEW,
"buildDrawingCache/SW Layer for " + getClass().getSimpleName());
}
try {
buildDrawingCacheImpl(autoScale);
} finally {
Trace.traceEnd(Trace.TRACE_TAG_VIEW);
}
}
}
/**
* private, internal implementation of buildDrawingCache, used to enable tracing
*/
private void buildDrawingCacheImpl(boolean autoScale) {
mCachingFailed = false;
int width = mRight - mLeft;
int height = mBottom - mTop;
final AttachInfo attachInfo = mAttachInfo;
final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired;
if (autoScale && scalingRequired) {
width = (int) ((width * attachInfo.mApplicationScale) + 0.5f);
height = (int) ((height * attachInfo.mApplicationScale) + 0.5f);
}
final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor;
final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque();
final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache;
final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4);
final long drawingCacheSize =
ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize();
if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) {
if (width > 0 && height > 0) {
Log.w(VIEW_LOG_TAG, getClass().getSimpleName() + " not displayed because it is"
+ " too large to fit into a software layer (or drawing cache), needs "
+ projectedBitmapSize + " bytes, only "
+ drawingCacheSize + " available");
}
destroyDrawingCache();
mCachingFailed = true;
return;
}
boolean clear = true;
Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache;
if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) {
Bitmap.Config quality;
if (!opaque) {
// Never pick ARGB_4444 because it looks awful
// Keep the DRAWING_CACHE_QUALITY_LOW flag just in case
switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) {
case DRAWING_CACHE_QUALITY_AUTO:
case DRAWING_CACHE_QUALITY_LOW:
case DRAWING_CACHE_QUALITY_HIGH:
default:
quality = Bitmap.Config.ARGB_8888;
break;
}
} else {
// Optimization for translucent windows
// If the window is translucent, use a 32 bits bitmap to benefit from memcpy()
quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
}
// Try to cleanup memory
if (bitmap != null) bitmap.recycle();
try {
bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(),
width, height, quality);
bitmap.setDensity(getResources().getDisplayMetrics().densityDpi);
if (autoScale) {
mDrawingCache = bitmap;
} else {
mUnscaledDrawingCache = bitmap;
}
if (opaque && use32BitCache) bitmap.setHasAlpha(false);
} catch (OutOfMemoryError e) {
// If there is not enough memory to create the bitmap cache, just
// ignore the issue as bitmap caches are not required to draw the
// view hierarchy
if (autoScale) {
mDrawingCache = null;
} else {
mUnscaledDrawingCache = null;
}
mCachingFailed = true;
return;
}
clear = drawingCacheBackgroundColor != 0;
}
Canvas canvas;
if (attachInfo != null) {
canvas = attachInfo.mCanvas;
if (canvas == null) {
canvas = new Canvas();
}
canvas.setBitmap(bitmap);
// Temporarily clobber the cached Canvas in case one of our children
// is also using a drawing cache. Without this, the children would
// steal the canvas by attaching their own bitmap to it and bad, bad
// thing would happen (invisible views, corrupted drawings, etc.)
attachInfo.mCanvas = null;
} else {
// This case should hopefully never or seldom happen
canvas = new Canvas(bitmap);
}
if (clear) {
bitmap.eraseColor(drawingCacheBackgroundColor);
}
computeScroll();
final int restoreCount = canvas.save();
if (autoScale && scalingRequired) {
final float scale = attachInfo.mApplicationScale;
canvas.scale(scale, scale);
}
canvas.translate(-mScrollX, -mScrollY);
mPrivateFlags |= PFLAG_DRAWN;
if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated ||
mLayerType != LAYER_TYPE_NONE) {
mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID;
}
// Fast path for layouts with no backgrounds
if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
dispatchDraw(canvas);
if (mOverlay != null && !mOverlay.isEmpty()) {
mOverlay.getOverlayView().draw(canvas);
}
} else {
draw(canvas);
}
canvas.restoreToCount(restoreCount);
canvas.setBitmap(null);
if (attachInfo != null) {
// Restore the cached Canvas for our siblings
attachInfo.mCanvas = canvas;
}
}
/**
* Create a snapshot of the view into a bitmap. We should probably make
* some form of this public, but should think about the API.
*
* @hide
*/
public Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) {
int width = mRight - mLeft;
int height = mBottom - mTop;
final AttachInfo attachInfo = mAttachInfo;
final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f;
width = (int) ((width * scale) + 0.5f);
height = (int) ((height * scale) + 0.5f);
Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(),
width > 0 ? width : 1, height > 0 ? height : 1, quality);
if (bitmap == null) {
throw new OutOfMemoryError();
}
Resources resources = getResources();
if (resources != null) {
bitmap.setDensity(resources.getDisplayMetrics().densityDpi);
}
Canvas canvas;
if (attachInfo != null) {
canvas = attachInfo.mCanvas;
if (canvas == null) {
canvas = new Canvas();
}
canvas.setBitmap(bitmap);
// Temporarily clobber the cached Canvas in case one of our children
// is also using a drawing cache. Without this, the children would
// steal the canvas by attaching their own bitmap to it and bad, bad
// things would happen (invisible views, corrupted drawings, etc.)
attachInfo.mCanvas = null;
} else {
// This case should hopefully never or seldom happen
canvas = new Canvas(bitmap);
}
if ((backgroundColor & 0xff000000) != 0) {
bitmap.eraseColor(backgroundColor);
}
computeScroll();
final int restoreCount = canvas.save();
canvas.scale(scale, scale);
canvas.translate(-mScrollX, -mScrollY);
// Temporarily remove the dirty mask
int flags = mPrivateFlags;
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
// Fast path for layouts with no backgrounds
if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
dispatchDraw(canvas);
if (mOverlay != null && !mOverlay.isEmpty()) {
mOverlay.getOverlayView().draw(canvas);
}
} else {
draw(canvas);
}
mPrivateFlags = flags;
canvas.restoreToCount(restoreCount);
canvas.setBitmap(null);
if (attachInfo != null) {
// Restore the cached Canvas for our siblings
attachInfo.mCanvas = canvas;
}
return bitmap;
}
/**
* Indicates whether this View is currently in edit mode. A View is usually
* in edit mode when displayed within a developer tool. For instance, if
* this View is being drawn by a visual user interface builder, this method
* should return true.
*
* Subclasses should check the return value of this method to provide
* different behaviors if their normal behavior might interfere with the
* host environment. For instance: the class spawns a thread in its
* constructor, the drawing code relies on device-specific features, etc.
*
* This method is usually checked in the drawing code of custom widgets.
*
* @return True if this View is in edit mode, false otherwise.
*/
public boolean isInEditMode() {
return false;
}
/**
* If the View draws content inside its padding and enables fading edges,
* it needs to support padding offsets. Padding offsets are added to the
* fading edges to extend the length of the fade so that it covers pixels
* drawn inside the padding.
*
* Subclasses of this class should override this method if they need
* to draw content inside the padding.
*
* @return True if padding offset must be applied, false otherwise.
*
* @see #getLeftPaddingOffset()
* @see #getRightPaddingOffset()
* @see #getTopPaddingOffset()
* @see #getBottomPaddingOffset()
*
* @since CURRENT
*/
protected boolean isPaddingOffsetRequired() {
return false;
}
/**
* Amount by which to extend the left fading region. Called only when
* {@link #isPaddingOffsetRequired()} returns true.
*
* @return The left padding offset in pixels.
*
* @see #isPaddingOffsetRequired()
*
* @since CURRENT
*/
protected int getLeftPaddingOffset() {
return 0;
}
/**
* Amount by which to extend the right fading region. Called only when
* {@link #isPaddingOffsetRequired()} returns true.
*
* @return The right padding offset in pixels.
*
* @see #isPaddingOffsetRequired()
*
* @since CURRENT
*/
protected int getRightPaddingOffset() {
return 0;
}
/**
* Amount by which to extend the top fading region. Called only when
* {@link #isPaddingOffsetRequired()} returns true.
*
* @return The top padding offset in pixels.
*
* @see #isPaddingOffsetRequired()
*
* @since CURRENT
*/
protected int getTopPaddingOffset() {
return 0;
}
/**
* Amount by which to extend the bottom fading region. Called only when
* {@link #isPaddingOffsetRequired()} returns true.
*
* @return The bottom padding offset in pixels.
*
* @see #isPaddingOffsetRequired()
*
* @since CURRENT
*/
protected int getBottomPaddingOffset() {
return 0;
}
/**
* @hide
* @param offsetRequired
*/
protected int getFadeTop(boolean offsetRequired) {
int top = mPaddingTop;
if (offsetRequired) top += getTopPaddingOffset();
return top;
}
/**
* @hide
* @param offsetRequired
*/
protected int getFadeHeight(boolean offsetRequired) {
int padding = mPaddingTop;
if (offsetRequired) padding += getTopPaddingOffset();
return mBottom - mTop - mPaddingBottom - padding;
}
/**
* <p>Indicates whether this view is attached to a hardware accelerated
* window or not.</p>
*
* <p>Even if this method returns true, it does not mean that every call
* to {@link #draw(android.graphics.Canvas)} will be made with an hardware
* accelerated {@link android.graphics.Canvas}. For instance, if this view
* is drawn onto an offscreen {@link android.graphics.Bitmap} and its
* window is hardware accelerated,
* {@link android.graphics.Canvas#isHardwareAccelerated()} will likely
* return false, and this method will return true.</p>
*
* @return True if the view is attached to a window and the window is
* hardware accelerated; false in any other case.
*/
@ViewDebug.ExportedProperty(category = "drawing")
public boolean isHardwareAccelerated() {
return mAttachInfo != null && mAttachInfo.mHardwareAccelerated;
}
/**
* Sets a rectangular area on this view to which the view will be clipped
* when it is drawn. Setting the value to null will remove the clip bounds
* and the view will draw normally, using its full bounds.
*
* @param clipBounds The rectangular area, in the local coordinates of
* this view, to which future drawing operations will be clipped.
*/
public void setClipBounds(Rect clipBounds) {
if (clipBounds == mClipBounds
|| (clipBounds != null && clipBounds.equals(mClipBounds))) {
return;
}
if (clipBounds != null) {
if (mClipBounds == null) {
mClipBounds = new Rect(clipBounds);
} else {
mClipBounds.set(clipBounds);
}
} else {
mClipBounds = null;
}
mRenderNode.setClipBounds(mClipBounds);
invalidateViewProperty(false, false);
}
/**
* Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}.
*
* @return A copy of the current clip bounds if clip bounds are set,
* otherwise null.
*/
public Rect getClipBounds() {
return (mClipBounds != null) ? new Rect(mClipBounds) : null;
}
/**
* Populates an output rectangle with the clip bounds of the view,
* returning {@code true} if successful or {@code false} if the view's
* clip bounds are {@code null}.
*
* @param outRect rectangle in which to place the clip bounds of the view
* @return {@code true} if successful or {@code false} if the view's
* clip bounds are {@code null}
*/
public boolean getClipBounds(Rect outRect) {
if (mClipBounds != null) {
outRect.set(mClipBounds);
return true;
}
return false;
}
/**
* Utility function, called by draw(canvas, parent, drawingTime) to handle the less common
* case of an active Animation being run on the view.
*/
private boolean applyLegacyAnimation(ViewGroup parent, long drawingTime,
Animation a, boolean scalingRequired) {
Transformation invalidationTransform;
final int flags = parent.mGroupFlags;
final boolean initialized = a.isInitialized();
if (!initialized) {
a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight());
a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop);
if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler);
onAnimationStart();
}
final Transformation t = parent.getChildTransformation();
boolean more = a.getTransformation(drawingTime, t, 1f);
if (scalingRequired && mAttachInfo.mApplicationScale != 1f) {
if (parent.mInvalidationTransformation == null) {
parent.mInvalidationTransformation = new Transformation();
}
invalidationTransform = parent.mInvalidationTransformation;
a.getTransformation(drawingTime, invalidationTransform, 1f);
} else {
invalidationTransform = t;
}
if (more) {
if (!a.willChangeBounds()) {
if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) ==
ViewGroup.FLAG_OPTIMIZE_INVALIDATE) {
parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED;
} else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) {
// The child need to draw an animation, potentially offscreen, so
// make sure we do not cancel invalidate requests
parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION;
parent.invalidate(mLeft, mTop, mRight, mBottom);
}
} else {
if (parent.mInvalidateRegion == null) {
parent.mInvalidateRegion = new RectF();
}
final RectF region = parent.mInvalidateRegion;
a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region,
invalidationTransform);
// The child need to draw an animation, potentially offscreen, so
// make sure we do not cancel invalidate requests
parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION;
final int left = mLeft + (int) region.left;
final int top = mTop + (int) region.top;
parent.invalidate(left, top, left + (int) (region.width() + .5f),
top + (int) (region.height() + .5f));
}
}
return more;
}
/**
* This method is called by getDisplayList() when a display list is recorded for a View.
* It pushes any properties to the RenderNode that aren't managed by the RenderNode.
*/
void setDisplayListProperties(RenderNode renderNode) {
if (renderNode != null) {
renderNode.setHasOverlappingRendering(getHasOverlappingRendering());
renderNode.setClipToBounds(mParent instanceof ViewGroup
&& ((ViewGroup) mParent).getClipChildren());
float alpha = 1;
if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags &
ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
ViewGroup parentVG = (ViewGroup) mParent;
final Transformation t = parentVG.getChildTransformation();
if (parentVG.getChildStaticTransformation(this, t)) {
final int transformType = t.getTransformationType();
if (transformType != Transformation.TYPE_IDENTITY) {
if ((transformType & Transformation.TYPE_ALPHA) != 0) {
alpha = t.getAlpha();
}
if ((transformType & Transformation.TYPE_MATRIX) != 0) {
renderNode.setStaticMatrix(t.getMatrix());
}
}
}
}
if (mTransformationInfo != null) {
alpha *= getFinalAlpha();
if (alpha < 1) {
final int multipliedAlpha = (int) (255 * alpha);
if (onSetAlpha(multipliedAlpha)) {
alpha = 1;
}
}
renderNode.setAlpha(alpha);
} else if (alpha < 1) {
renderNode.setAlpha(alpha);
}
}
}
/**
* This method is called by ViewGroup.drawChild() to have each child view draw itself.
*
* This is where the View specializes rendering behavior based on layer type,
* and hardware acceleration.
*/
boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) {
final boolean hardwareAcceleratedCanvas = canvas.isHardwareAccelerated();
/* If an attached view draws to a HW canvas, it may use its RenderNode + DisplayList.
*
* If a view is dettached, its DisplayList shouldn't exist. If the canvas isn't
* HW accelerated, it can't handle drawing RenderNodes.
*/
boolean drawingWithRenderNode = mAttachInfo != null
&& mAttachInfo.mHardwareAccelerated
&& hardwareAcceleratedCanvas;
boolean more = false;
final boolean childHasIdentityMatrix = hasIdentityMatrix();
final int parentFlags = parent.mGroupFlags;
if ((parentFlags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) != 0) {
parent.getChildTransformation().clear();
parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION;
}
Transformation transformToApply = null;
boolean concatMatrix = false;
final boolean scalingRequired = mAttachInfo != null && mAttachInfo.mScalingRequired;
final Animation a = getAnimation();
if (a != null) {
more = applyLegacyAnimation(parent, drawingTime, a, scalingRequired);
concatMatrix = a.willChangeTransformationMatrix();
if (concatMatrix) {
mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM;
}
transformToApply = parent.getChildTransformation();
} else {
if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) != 0) {
// No longer animating: clear out old animation matrix
mRenderNode.setAnimationMatrix(null);
mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM;
}
if (!drawingWithRenderNode
&& (parentFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
final Transformation t = parent.getChildTransformation();
final boolean hasTransform = parent.getChildStaticTransformation(this, t);
if (hasTransform) {
final int transformType = t.getTransformationType();
transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null;
concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0;
}
}
}
concatMatrix |= !childHasIdentityMatrix;
// Sets the flag as early as possible to allow draw() implementations
// to call invalidate() successfully when doing animations
mPrivateFlags |= PFLAG_DRAWN;
if (!concatMatrix &&
(parentFlags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS |
ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN &&
canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) &&
(mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) {
mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED;
return more;
}
mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED;
if (hardwareAcceleratedCanvas) {
// Clear INVALIDATED flag to allow invalidation to occur during rendering, but
// retain the flag's value temporarily in the mRecreateDisplayList flag
mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) != 0;
mPrivateFlags &= ~PFLAG_INVALIDATED;
}
RenderNode renderNode = null;
Bitmap cache = null;
int layerType = getLayerType(); // TODO: signify cache state with just 'cache' local
if (layerType == LAYER_TYPE_SOFTWARE || !drawingWithRenderNode) {
if (layerType != LAYER_TYPE_NONE) {
// If not drawing with RenderNode, treat HW layers as SW
layerType = LAYER_TYPE_SOFTWARE;
buildDrawingCache(true);
}
cache = getDrawingCache(true);
}
if (drawingWithRenderNode) {
// Delay getting the display list until animation-driven alpha values are
// set up and possibly passed on to the view
renderNode = updateDisplayListIfDirty();
if (!renderNode.isValid()) {
// Uncommon, but possible. If a view is removed from the hierarchy during the call
// to getDisplayList(), the display list will be marked invalid and we should not
// try to use it again.
renderNode = null;
drawingWithRenderNode = false;
}
}
int sx = 0;
int sy = 0;
if (!drawingWithRenderNode) {
computeScroll();
sx = mScrollX;
sy = mScrollY;
}
final boolean drawingWithDrawingCache = cache != null && !drawingWithRenderNode;
final boolean offsetForScroll = cache == null && !drawingWithRenderNode;
int restoreTo = -1;
if (!drawingWithRenderNode || transformToApply != null) {
restoreTo = canvas.save();
}
if (offsetForScroll) {
canvas.translate(mLeft - sx, mTop - sy);
} else {
if (!drawingWithRenderNode) {
canvas.translate(mLeft, mTop);
}
if (scalingRequired) {
if (drawingWithRenderNode) {
// TODO: Might not need this if we put everything inside the DL
restoreTo = canvas.save();
}
// mAttachInfo cannot be null, otherwise scalingRequired == false
final float scale = 1.0f / mAttachInfo.mApplicationScale;
canvas.scale(scale, scale);
}
}
float alpha = drawingWithRenderNode ? 1 : (getAlpha() * getTransitionAlpha());
if (transformToApply != null
|| alpha < 1
|| !hasIdentityMatrix()
|| (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) != 0) {
if (transformToApply != null || !childHasIdentityMatrix) {
int transX = 0;
int transY = 0;
if (offsetForScroll) {
transX = -sx;
transY = -sy;
}
if (transformToApply != null) {
if (concatMatrix) {
if (drawingWithRenderNode) {
renderNode.setAnimationMatrix(transformToApply.getMatrix());
} else {
// Undo the scroll translation, apply the transformation matrix,
// then redo the scroll translate to get the correct result.
canvas.translate(-transX, -transY);
canvas.concat(transformToApply.getMatrix());
canvas.translate(transX, transY);
}
parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
}
float transformAlpha = transformToApply.getAlpha();
if (transformAlpha < 1) {
alpha *= transformAlpha;
parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
}
}
if (!childHasIdentityMatrix && !drawingWithRenderNode) {
canvas.translate(-transX, -transY);
canvas.concat(getMatrix());
canvas.translate(transX, transY);
}
}
// Deal with alpha if it is or used to be <1
if (alpha < 1 || (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) != 0) {
if (alpha < 1) {
mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA;
} else {
mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA;
}
parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION;
if (!drawingWithDrawingCache) {
final int multipliedAlpha = (int) (255 * alpha);
if (!onSetAlpha(multipliedAlpha)) {
if (drawingWithRenderNode) {
renderNode.setAlpha(alpha * getAlpha() * getTransitionAlpha());
} else if (layerType == LAYER_TYPE_NONE) {
canvas.saveLayerAlpha(sx, sy, sx + getWidth(), sy + getHeight(),
multipliedAlpha);
}
} else {
// Alpha is handled by the child directly, clobber the layer's alpha
mPrivateFlags |= PFLAG_ALPHA_SET;
}
}
}
} else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) {
onSetAlpha(255);
mPrivateFlags &= ~PFLAG_ALPHA_SET;
}
if (!drawingWithRenderNode) {
// apply clips directly, since RenderNode won't do it for this draw
if ((parentFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 && cache == null) {
if (offsetForScroll) {
canvas.clipRect(sx, sy, sx + getWidth(), sy + getHeight());
} else {
if (!scalingRequired || cache == null) {
canvas.clipRect(0, 0, getWidth(), getHeight());
} else {
canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight());
}
}
}
if (mClipBounds != null) {
// clip bounds ignore scroll
canvas.clipRect(mClipBounds);
}
}
if (!drawingWithDrawingCache) {
if (drawingWithRenderNode) {
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
((DisplayListCanvas) canvas).drawRenderNode(renderNode);
} else {
// Fast path for layouts with no backgrounds
if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) {
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
dispatchDraw(canvas);
} else {
draw(canvas);
}
}
} else if (cache != null) {
mPrivateFlags &= ~PFLAG_DIRTY_MASK;
if (layerType == LAYER_TYPE_NONE || mLayerPaint == null) {
// no layer paint, use temporary paint to draw bitmap
Paint cachePaint = parent.mCachePaint;
if (cachePaint == null) {
cachePaint = new Paint();
cachePaint.setDither(false);
parent.mCachePaint = cachePaint;
}
cachePaint.setAlpha((int) (alpha * 255));
canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint);
} else {
// use layer paint to draw the bitmap, merging the two alphas, but also restore
int layerPaintAlpha = mLayerPaint.getAlpha();
if (alpha < 1) {
mLayerPaint.setAlpha((int) (alpha * layerPaintAlpha));
}
canvas.drawBitmap(cache, 0.0f, 0.0f, mLayerPaint);
if (alpha < 1) {
mLayerPaint.setAlpha(layerPaintAlpha);
}
}
}
if (restoreTo >= 0) {
canvas.restoreToCount(restoreTo);
}
if (a != null && !more) {
if (!hardwareAcceleratedCanvas && !a.getFillAfter()) {
onSetAlpha(255);
}
parent.finishAnimatingView(this, a);
}
if (more && hardwareAcceleratedCanvas) {
if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) {
// alpha animations should cause the child to recreate its display list
invalidate(true);
}
}
mRecreateDisplayList = false;
return more;
}
/**
* Manually render this view (and all of its children) to the given Canvas.
* The view must have already done a full layout before this function is
* called. When implementing a view, implement
* {@link #onDraw(android.graphics.Canvas)} instead of overriding this method.
* If you do need to override this method, call the superclass version.
*
* @param canvas The Canvas to which the View is rendered.
*/
@CallSuper
public void draw(Canvas canvas) {
final int privateFlags = mPrivateFlags;
final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE &&
(mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState);
mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN;
/*
* Draw traversal performs several drawing steps which must be executed
* in the appropriate order:
*
* 1. Draw the background
* 2. If necessary, save the canvas' layers to prepare for fading
* 3. Draw view's content
* 4. Draw children
* 5. If necessary, draw the fading edges and restore layers
* 6. Draw decorations (scrollbars for instance)
*/
// Step 1, draw the background, if needed
int saveCount;
if (!dirtyOpaque) {
drawBackground(canvas);
}
// skip step 2 & 5 if possible (common case)
final int viewFlags = mViewFlags;
boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0;
boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0;
if (!verticalEdges && !horizontalEdges) {
// Step 3, draw the content
if (!dirtyOpaque) onDraw(canvas);
// Step 4, draw the children
dispatchDraw(canvas);
// Overlay is part of the content and draws beneath Foreground
if (mOverlay != null && !mOverlay.isEmpty()) {
mOverlay.getOverlayView().dispatchDraw(canvas);
}
// Step 6, draw decorations (foreground, scrollbars)
onDrawForeground(canvas);
// we're done...
return;
}
/*
* Here we do the full fledged routine...
* (this is an uncommon case where speed matters less,
* this is why we repeat some of the tests that have been
* done above)
*/
boolean drawTop = false;
boolean drawBottom = false;
boolean drawLeft = false;
boolean drawRight = false;
float topFadeStrength = 0.0f;
float bottomFadeStrength = 0.0f;
float leftFadeStrength = 0.0f;
float rightFadeStrength = 0.0f;
// Step 2, save the canvas' layers
int paddingLeft = mPaddingLeft;
final boolean offsetRequired = isPaddingOffsetRequired();
if (offsetRequired) {
paddingLeft += getLeftPaddingOffset();
}
int left = mScrollX + paddingLeft;
int right = left + mRight - mLeft - mPaddingRight - paddingLeft;
int top = mScrollY + getFadeTop(offsetRequired);
int bottom = top + getFadeHeight(offsetRequired);
if (offsetRequired) {
right += getRightPaddingOffset();
bottom += getBottomPaddingOffset();
}
final ScrollabilityCache scrollabilityCache = mScrollCache;
final float fadeHeight = scrollabilityCache.fadingEdgeLength;
int length = (int) fadeHeight;
// clip the fade length if top and bottom fades overlap
// overlapping fades produce odd-looking artifacts
if (verticalEdges && (top + length > bottom - length)) {
length = (bottom - top) / 2;
}
// also clip horizontal fades if necessary
if (horizontalEdges && (left + length > right - length)) {
length = (right - left) / 2;
}
if (verticalEdges) {
topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength()));
drawTop = topFadeStrength * fadeHeight > 1.0f;
bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength()));
drawBottom = bottomFadeStrength * fadeHeight > 1.0f;
}
if (horizontalEdges) {
leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength()));
drawLeft = leftFadeStrength * fadeHeight > 1.0f;
rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength()));
drawRight = rightFadeStrength * fadeHeight > 1.0f;
}
saveCount = canvas.getSaveCount();
int solidColor = getSolidColor();
if (solidColor == 0) {
final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG;
if (drawTop) {
canvas.saveLayer(left, top, right, top + length, null, flags);
}
if (drawBottom) {
canvas.saveLayer(left, bottom - length, right, bottom, null, flags);
}
if (drawLeft) {
canvas.saveLayer(left, top, left + length, bottom, null, flags);
}
if (drawRight) {
canvas.saveLayer(right - length, top, right, bottom, null, flags);
}
} else {
scrollabilityCache.setFadeColor(solidColor);
}
// Step 3, draw the content
if (!dirtyOpaque) onDraw(canvas);
// Step 4, draw the children
dispatchDraw(canvas);
// Step 5, draw the fade effect and restore layers
final Paint p = scrollabilityCache.paint;
final Matrix matrix = scrollabilityCache.matrix;
final Shader fade = scrollabilityCache.shader;
if (drawTop) {
matrix.setScale(1, fadeHeight * topFadeStrength);
matrix.postTranslate(left, top);
fade.setLocalMatrix(matrix);
p.setShader(fade);
canvas.drawRect(left, top, right, top + length, p);
}
if (drawBottom) {
matrix.setScale(1, fadeHeight * bottomFadeStrength);
matrix.postRotate(180);
matrix.postTranslate(left, bottom);
fade.setLocalMatrix(matrix);
p.setShader(fade);
canvas.drawRect(left, bottom - length, right, bottom, p);
}
if (drawLeft) {
matrix.setScale(1, fadeHeight * leftFadeStrength);
matrix.postRotate(-90);
matrix.postTranslate(left, top);
fade.setLocalMatrix(matrix);
p.setShader(fade);
canvas.drawRect(left, top, left + length, bottom, p);
}
if (drawRight) {
matrix.setScale(1, fadeHeight * rightFadeStrength);
matrix.postRotate(90);
matrix.postTranslate(right, top);
fade.setLocalMatrix(matrix);
p.setShader(fade);
canvas.drawRect(right - length, top, right, bottom, p);
}
canvas.restoreToCount(saveCount);
// Overlay is part of the content and draws beneath Foreground
if (mOverlay != null && !mOverlay.isEmpty()) {
mOverlay.getOverlayView().dispatchDraw(canvas);
}
// Step 6, draw decorations (foreground, scrollbars)
onDrawForeground(canvas);
}
/**
* Draws the background onto the specified canvas.
*
* @param canvas Canvas on which to draw the background
*/
private void drawBackground(Canvas canvas) {
final Drawable background = mBackground;
if (background == null) {
return;
}
setBackgroundBounds();
// Attempt to use a display list if requested.
if (canvas.isHardwareAccelerated() && mAttachInfo != null
&& mAttachInfo.mHardwareRenderer != null) {
mBackgroundRenderNode = getDrawableRenderNode(background, mBackgroundRenderNode);
final RenderNode renderNode = mBackgroundRenderNode;
if (renderNode != null && renderNode.isValid()) {
setBackgroundRenderNodeProperties(renderNode);
((DisplayListCanvas) canvas).drawRenderNode(renderNode);
return;
}
}
final int scrollX = mScrollX;
final int scrollY = mScrollY;
if ((scrollX | scrollY) == 0) {
background.draw(canvas);
} else {
canvas.translate(scrollX, scrollY);
background.draw(canvas);
canvas.translate(-scrollX, -scrollY);
}
}
/**
* Sets the correct background bounds and rebuilds the outline, if needed.
* <p/>
* This is called by LayoutLib.
*/
void setBackgroundBounds() {
if (mBackgroundSizeChanged && mBackground != null) {
mBackground.setBounds(0, 0, mRight - mLeft, mBottom - mTop);
mBackgroundSizeChanged = false;
rebuildOutline();
}
}
private void setBackgroundRenderNodeProperties(RenderNode renderNode) {
renderNode.setTranslationX(mScrollX);
renderNode.setTranslationY(mScrollY);
}
/**
* Creates a new display list or updates the existing display list for the
* specified Drawable.
*
* @param drawable Drawable for which to create a display list
* @param renderNode Existing RenderNode, or {@code null}
* @return A valid display list for the specified drawable
*/
private RenderNode getDrawableRenderNode(Drawable drawable, RenderNode renderNode) {
if (renderNode == null) {
renderNode = RenderNode.create(drawable.getClass().getName(), this);
}
final Rect bounds = drawable.getBounds();
final int width = bounds.width();
final int height = bounds.height();
final DisplayListCanvas canvas = renderNode.start(width, height);
// Reverse left/top translation done by drawable canvas, which will
// instead be applied by rendernode's LTRB bounds below. This way, the
// drawable's bounds match with its rendernode bounds and its content
// will lie within those bounds in the rendernode tree.
canvas.translate(-bounds.left, -bounds.top);
try {
drawable.draw(canvas);
} finally {
renderNode.end(canvas);
}
// Set up drawable properties that are view-independent.
renderNode.setLeftTopRightBottom(bounds.left, bounds.top, bounds.right, bounds.bottom);
renderNode.setProjectBackwards(drawable.isProjected());
renderNode.setProjectionReceiver(true);
renderNode.setClipToBounds(false);
return renderNode;
}
/**
* Returns the overlay for this view, creating it if it does not yet exist.
* Adding drawables to the overlay will cause them to be displayed whenever
* the view itself is redrawn. Objects in the overlay should be actively
* managed: remove them when they should not be displayed anymore. The
* overlay will always have the same size as its host view.
*
* <p>Note: Overlays do not currently work correctly with {@link
* SurfaceView} or {@link TextureView}; contents in overlays for these
* types of views may not display correctly.</p>
*
* @return The ViewOverlay object for this view.
* @see ViewOverlay
*/
public ViewOverlay getOverlay() {
if (mOverlay == null) {
mOverlay = new ViewOverlay(mContext, this);
}
return mOverlay;
}
/**
* Override this if your view is known to always be drawn on top of a solid color background,
* and needs to draw fading edges. Returning a non-zero color enables the view system to
* optimize the drawing of the fading edges. If you do return a non-zero color, the alpha
* should be set to 0xFF.
*
* @see #setVerticalFadingEdgeEnabled(boolean)
* @see #setHorizontalFadingEdgeEnabled(boolean)
*
* @return The known solid color background for this view, or 0 if the color may vary
*/
@ViewDebug.ExportedProperty(category = "drawing")
@ColorInt
public int getSolidColor() {
return 0;
}
/**
* Build a human readable string representation of the specified view flags.
*
* @param flags the view flags to convert to a string
* @return a String representing the supplied flags
*/
private static String printFlags(int flags) {
String output = "";
int numFlags = 0;
if ((flags & FOCUSABLE_MASK) == FOCUSABLE) {
output += "TAKES_FOCUS";
numFlags++;
}
switch (flags & VISIBILITY_MASK) {
case INVISIBLE:
if (numFlags > 0) {
output += " ";
}
output += "INVISIBLE";
// USELESS HERE numFlags++;
break;
case GONE:
if (numFlags > 0) {
output += " ";
}
output += "GONE";
// USELESS HERE numFlags++;
break;
default:
break;
}
return output;
}
/**
* Build a human readable string representation of the specified private
* view flags.
*
* @param privateFlags the private view flags to convert to a string
* @return a String representing the supplied flags
*/
private static String printPrivateFlags(int privateFlags) {
String output = "";
int numFlags = 0;
if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) {
output += "WANTS_FOCUS";
numFlags++;
}
if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) {
if (numFlags > 0) {
output += " ";
}
output += "FOCUSED";
numFlags++;
}
if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) {
if (numFlags > 0) {
output += " ";
}
output += "SELECTED";
numFlags++;
}
if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) {
if (numFlags > 0) {
output += " ";
}
output += "IS_ROOT_NAMESPACE";
numFlags++;
}
if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) {
if (numFlags > 0) {
output += " ";
}
output += "HAS_BOUNDS";
numFlags++;
}
if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) {
if (numFlags > 0) {
output += " ";
}
output += "DRAWN";
// USELESS HERE numFlags++;
}
return output;
}
/**
* <p>Indicates whether or not this view's layout will be requested during
* the next hierarchy layout pass.</p>
*
* @return true if the layout will be forced during next layout pass
*/
public boolean isLayoutRequested() {
return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT;
}
/**
* Return true if o is a ViewGroup that is laying out using optical bounds.
* @hide
*/
public static boolean isLayoutModeOptical(Object o) {
return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical();
}
private boolean setOpticalFrame(int left, int top, int right, int bottom) {
Insets parentInsets = mParent instanceof View ?
((View) mParent).getOpticalInsets() : Insets.NONE;
Insets childInsets = getOpticalInsets();
return setFrame(
left + parentInsets.left - childInsets.left,
top + parentInsets.top - childInsets.top,
right + parentInsets.left + childInsets.right,
bottom + parentInsets.top + childInsets.bottom);
}
/**
* Assign a size and position to a view and all of its
* descendants
*
* <p>This is the second phase of the layout mechanism.
* (The first is measuring). In this phase, each parent calls
* layout on all of its children to position them.
* This is typically done using the child measurements
* that were stored in the measure pass().</p>
*
* <p>Derived classes should not override this method.
* Derived classes with children should override
* onLayout. In that method, they should
* call layout on each of their children.</p>
*
* @param l Left position, relative to parent
* @param t Top position, relative to parent
* @param r Right position, relative to parent
* @param b Bottom position, relative to parent
*/
@SuppressWarnings({"unchecked"})
public void layout(int l, int t, int r, int b) {
if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) {
onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec);
mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
}
int oldL = mLeft;
int oldT = mTop;
int oldB = mBottom;
int oldR = mRight;
boolean changed = isLayoutModeOptical(mParent) ?
setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b);
if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) {
onLayout(changed, l, t, r, b);
if (shouldDrawRoundScrollbar()) {
if(mRoundScrollbarRenderer == null) {
mRoundScrollbarRenderer = new RoundScrollbarRenderer(this);
}
} else {
mRoundScrollbarRenderer = null;
}
mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED;
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnLayoutChangeListeners != null) {
ArrayList<OnLayoutChangeListener> listenersCopy =
(ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone();
int numListeners = listenersCopy.size();
for (int i = 0; i < numListeners; ++i) {
listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB);
}
}
}
mPrivateFlags &= ~PFLAG_FORCE_LAYOUT;
mPrivateFlags3 |= PFLAG3_IS_LAID_OUT;
}
/**
* Called from layout when this view should
* assign a size and position to each of its children.
*
* Derived classes with children should override
* this method and call layout on each of
* their children.
* @param changed This is a new size or position for this view
* @param left Left position, relative to parent
* @param top Top position, relative to parent
* @param right Right position, relative to parent
* @param bottom Bottom position, relative to parent
*/
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
}
/**
* Assign a size and position to this view.
*
* This is called from layout.
*
* @param left Left position, relative to parent
* @param top Top position, relative to parent
* @param right Right position, relative to parent
* @param bottom Bottom position, relative to parent
* @return true if the new size and position are different than the
* previous ones
* {@hide}
*/
protected boolean setFrame(int left, int top, int right, int bottom) {
boolean changed = false;
if (DBG) {
Log.d("View", this + " View.setFrame(" + left + "," + top + ","
+ right + "," + bottom + ")");
}
if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
changed = true;
// Remember our drawn bit
int drawn = mPrivateFlags & PFLAG_DRAWN;
int oldWidth = mRight - mLeft;
int oldHeight = mBottom - mTop;
int newWidth = right - left;
int newHeight = bottom - top;
boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight);
// Invalidate our old position
invalidate(sizeChanged);
mLeft = left;
mTop = top;
mRight = right;
mBottom = bottom;
mRenderNode.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom);
mPrivateFlags |= PFLAG_HAS_BOUNDS;
if (sizeChanged) {
sizeChange(newWidth, newHeight, oldWidth, oldHeight);
}
if ((mViewFlags & VISIBILITY_MASK) == VISIBLE || mGhostView != null) {
// If we are visible, force the DRAWN bit to on so that
// this invalidate will go through (at least to our parent).
// This is because someone may have invalidated this view
// before this call to setFrame came in, thereby clearing
// the DRAWN bit.
mPrivateFlags |= PFLAG_DRAWN;
invalidate(sizeChanged);
// parent display list may need to be recreated based on a change in the bounds
// of any child
invalidateParentCaches();
}
// Reset drawn bit to original value (invalidate turns it off)
mPrivateFlags |= drawn;
mBackgroundSizeChanged = true;
if (mForegroundInfo != null) {
mForegroundInfo.mBoundsChanged = true;
}
notifySubtreeAccessibilityStateChangedIfNeeded();
}
return changed;
}
/**
* Same as setFrame, but public and hidden. For use in {@link android.transition.ChangeBounds}.
* @hide
*/
public void setLeftTopRightBottom(int left, int top, int right, int bottom) {
setFrame(left, top, right, bottom);
}
private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) {
onSizeChanged(newWidth, newHeight, oldWidth, oldHeight);
if (mOverlay != null) {
mOverlay.getOverlayView().setRight(newWidth);
mOverlay.getOverlayView().setBottom(newHeight);
}
rebuildOutline();
}
/**
* Finalize inflating a view from XML. This is called as the last phase
* of inflation, after all child views have been added.
*
* <p>Even if the subclass overrides onFinishInflate, they should always be
* sure to call the super method, so that we get called.
*/
@CallSuper
protected void onFinishInflate() {
}
/**
* Returns the resources associated with this view.
*
* @return Resources object.
*/
public Resources getResources() {
return mResources;
}
/**
* Invalidates the specified Drawable.
*
* @param drawable the drawable to invalidate
*/
@Override
public void invalidateDrawable(@NonNull Drawable drawable) {
if (verifyDrawable(drawable)) {
final Rect dirty = drawable.getDirtyBounds();
final int scrollX = mScrollX;
final int scrollY = mScrollY;
invalidate(dirty.left + scrollX, dirty.top + scrollY,
dirty.right + scrollX, dirty.bottom + scrollY);
rebuildOutline();
}
}
/**
* Schedules an action on a drawable to occur at a specified time.
*
* @param who the recipient of the action
* @param what the action to run on the drawable
* @param when the time at which the action must occur. Uses the
* {@link SystemClock#uptimeMillis} timebase.
*/
@Override
public void scheduleDrawable(@NonNull Drawable who, @NonNull Runnable what, long when) {
if (verifyDrawable(who) && what != null) {
final long delay = when - SystemClock.uptimeMillis();
if (mAttachInfo != null) {
mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed(
Choreographer.CALLBACK_ANIMATION, what, who,
Choreographer.subtractFrameDelay(delay));
} else {
// Postpone the runnable until we know
// on which thread it needs to run.
getRunQueue().postDelayed(what, delay);
}
}
}
/**
* Cancels a scheduled action on a drawable.
*
* @param who the recipient of the action
* @param what the action to cancel
*/
@Override
public void unscheduleDrawable(@NonNull Drawable who, @NonNull Runnable what) {
if (verifyDrawable(who) && what != null) {
if (mAttachInfo != null) {
mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
Choreographer.CALLBACK_ANIMATION, what, who);
}
getRunQueue().removeCallbacks(what);
}
}
/**
* Unschedule any events associated with the given Drawable. This can be
* used when selecting a new Drawable into a view, so that the previous
* one is completely unscheduled.
*
* @param who The Drawable to unschedule.
*
* @see #drawableStateChanged
*/
public void unscheduleDrawable(Drawable who) {
if (mAttachInfo != null && who != null) {
mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks(
Choreographer.CALLBACK_ANIMATION, null, who);
}
}
/**
* Resolve the Drawables depending on the layout direction. This is implicitly supposing
* that the View directionality can and will be resolved before its Drawables.
*
* Will call {@link View#onResolveDrawables} when resolution is done.
*
* @hide
*/
protected void resolveDrawables() {
// Drawables resolution may need to happen before resolving the layout direction (which is
// done only during the measure() call).
// If the layout direction is not resolved yet, we cannot resolve the Drawables except in
// one case: when the raw layout direction has not been defined as LAYOUT_DIRECTION_INHERIT.
// So, if the raw layout direction is LAYOUT_DIRECTION_LTR or LAYOUT_DIRECTION_RTL or
// LAYOUT_DIRECTION_LOCALE, we can "cheat" and we don't need to wait for the layout
// direction to be resolved as its resolved value will be the same as its raw value.
if (!isLayoutDirectionResolved() &&
getRawLayoutDirection() == View.LAYOUT_DIRECTION_INHERIT) {
return;
}
final int layoutDirection = isLayoutDirectionResolved() ?
getLayoutDirection() : getRawLayoutDirection();
if (mBackground != null) {
mBackground.setLayoutDirection(layoutDirection);
}
if (mForegroundInfo != null && mForegroundInfo.mDrawable != null) {
mForegroundInfo.mDrawable.setLayoutDirection(layoutDirection);
}
mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED;
onResolveDrawables(layoutDirection);
}
boolean areDrawablesResolved() {
return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED;
}
/**
* Called when layout direction has been resolved.
*
* The default implementation does nothing.
*
* @param layoutDirection The resolved layout direction.
*
* @see #LAYOUT_DIRECTION_LTR
* @see #LAYOUT_DIRECTION_RTL
*
* @hide
*/
public void onResolveDrawables(@ResolvedLayoutDir int layoutDirection) {
}
/**
* @hide
*/
protected void resetResolvedDrawables() {
resetResolvedDrawablesInternal();
}
void resetResolvedDrawablesInternal() {
mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED;
}
/**
* If your view subclass is displaying its own Drawable objects, it should
* override this function and return true for any Drawable it is
* displaying. This allows animations for those drawables to be
* scheduled.
*
* <p>Be sure to call through to the super class when overriding this
* function.
*
* @param who The Drawable to verify. Return true if it is one you are
* displaying, else return the result of calling through to the
* super class.
*
* @return boolean If true than the Drawable is being displayed in the
* view; else false and it is not allowed to animate.
*
* @see #unscheduleDrawable(android.graphics.drawable.Drawable)
* @see #drawableStateChanged()
*/
@CallSuper
protected boolean verifyDrawable(@NonNull Drawable who) {
// Avoid verifying the scroll bar drawable so that we don't end up in
// an invalidation loop. This effectively prevents the scroll bar
// drawable from triggering invalidations and scheduling runnables.
return who == mBackground || (mForegroundInfo != null && mForegroundInfo.mDrawable == who);
}
/**
* This function is called whenever the state of the view changes in such
* a way that it impacts the state of drawables being shown.
* <p>
* If the View has a StateListAnimator, it will also be called to run necessary state
* change animations.
* <p>
* Be sure to call through to the superclass when overriding this function.
*
* @see Drawable#setState(int[])
*/
@CallSuper
protected void drawableStateChanged() {
final int[] state = getDrawableState();
boolean changed = false;
final Drawable bg = mBackground;
if (bg != null && bg.isStateful()) {
changed |= bg.setState(state);
}
final Drawable fg = mForegroundInfo != null ? mForegroundInfo.mDrawable : null;
if (fg != null && fg.isStateful()) {
changed |= fg.setState(state);
}
if (mScrollCache != null) {
final Drawable scrollBar = mScrollCache.scrollBar;
if (scrollBar != null && scrollBar.isStateful()) {
changed |= scrollBar.setState(state)
&& mScrollCache.state != ScrollabilityCache.OFF;
}
}
if (mStateListAnimator != null) {
mStateListAnimator.setState(state);
}
if (changed) {
invalidate();
}
}
/**
* This function is called whenever the view hotspot changes and needs to
* be propagated to drawables or child views managed by the view.
* <p>
* Dispatching to child views is handled by
* {@link #dispatchDrawableHotspotChanged(float, float)}.
* <p>
* Be sure to call through to the superclass when overriding this function.
*
* @param x hotspot x coordinate
* @param y hotspot y coordinate
*/
@CallSuper
public void drawableHotspotChanged(float x, float y) {
if (mBackground != null) {
mBackground.setHotspot(x, y);
}
if (mForegroundInfo != null && mForegroundInfo.mDrawable != null) {
mForegroundInfo.mDrawable.setHotspot(x, y);
}
dispatchDrawableHotspotChanged(x, y);
}
/**
* Dispatches drawableHotspotChanged to all of this View's children.
*
* @param x hotspot x coordinate
* @param y hotspot y coordinate
* @see #drawableHotspotChanged(float, float)
*/
public void dispatchDrawableHotspotChanged(float x, float y) {
}
/**
* Call this to force a view to update its drawable state. This will cause
* drawableStateChanged to be called on this view. Views that are interested
* in the new state should call getDrawableState.
*
* @see #drawableStateChanged
* @see #getDrawableState
*/
public void refreshDrawableState() {
mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY;
drawableStateChanged();
ViewParent parent = mParent;
if (parent != null) {
parent.childDrawableStateChanged(this);
}
}
/**
* Return an array of resource IDs of the drawable states representing the
* current state of the view.
*
* @return The current drawable state
*
* @see Drawable#setState(int[])
* @see #drawableStateChanged()
* @see #onCreateDrawableState(int)
*/
public final int[] getDrawableState() {
if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) {
return mDrawableState;
} else {
mDrawableState = onCreateDrawableState(0);
mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY;
return mDrawableState;
}
}
/**
* Generate the new {@link android.graphics.drawable.Drawable} state for
* this view. This is called by the view
* system when the cached Drawable state is determined to be invalid. To
* retrieve the current state, you should use {@link #getDrawableState}.
*
* @param extraSpace if non-zero, this is the number of extra entries you
* would like in the returned array in which you can place your own
* states.
*
* @return Returns an array holding the current {@link Drawable} state of
* the view.
*
* @see #mergeDrawableStates(int[], int[])
*/
protected int[] onCreateDrawableState(int extraSpace) {
if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE &&
mParent instanceof View) {
return ((View) mParent).onCreateDrawableState(extraSpace);
}
int[] drawableState;
int privateFlags = mPrivateFlags;
int viewStateIndex = 0;
if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= StateSet.VIEW_STATE_PRESSED;
if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= StateSet.VIEW_STATE_ENABLED;
if (isFocused()) viewStateIndex |= StateSet.VIEW_STATE_FOCUSED;
if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= StateSet.VIEW_STATE_SELECTED;
if (hasWindowFocus()) viewStateIndex |= StateSet.VIEW_STATE_WINDOW_FOCUSED;
if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= StateSet.VIEW_STATE_ACTIVATED;
if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested &&
ThreadedRenderer.isAvailable()) {
// This is set if HW acceleration is requested, even if the current
// process doesn't allow it. This is just to allow app preview
// windows to better match their app.
viewStateIndex |= StateSet.VIEW_STATE_ACCELERATED;
}
if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= StateSet.VIEW_STATE_HOVERED;
final int privateFlags2 = mPrivateFlags2;
if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) {
viewStateIndex |= StateSet.VIEW_STATE_DRAG_CAN_ACCEPT;
}
if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) {
viewStateIndex |= StateSet.VIEW_STATE_DRAG_HOVERED;
}
drawableState = StateSet.get(viewStateIndex);
//noinspection ConstantIfStatement
if (false) {
Log.i("View", "drawableStateIndex=" + viewStateIndex);
Log.i("View", toString()
+ " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0)
+ " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED)
+ " fo=" + hasFocus()
+ " sl=" + ((privateFlags & PFLAG_SELECTED) != 0)
+ " wf=" + hasWindowFocus()
+ ": " + Arrays.toString(drawableState));
}
if (extraSpace == 0) {
return drawableState;
}
final int[] fullState;
if (drawableState != null) {
fullState = new int[drawableState.length + extraSpace];
System.arraycopy(drawableState, 0, fullState, 0, drawableState.length);
} else {
fullState = new int[extraSpace];
}
return fullState;
}
/**
* Merge your own state values in <var>additionalState</var> into the base
* state values <var>baseState</var> that were returned by
* {@link #onCreateDrawableState(int)}.
*
* @param baseState The base state values returned by
* {@link #onCreateDrawableState(int)}, which will be modified to also hold your
* own additional state values.
*
* @param additionalState The additional state values you would like
* added to <var>baseState</var>; this array is not modified.
*
* @return As a convenience, the <var>baseState</var> array you originally
* passed into the function is returned.
*
* @see #onCreateDrawableState(int)
*/
protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) {
final int N = baseState.length;
int i = N - 1;
while (i >= 0 && baseState[i] == 0) {
i--;
}
System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length);
return baseState;
}
/**
* Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()}
* on all Drawable objects associated with this view.
* <p>
* Also calls {@link StateListAnimator#jumpToCurrentState()} if there is a StateListAnimator
* attached to this view.
*/
@CallSuper
public void jumpDrawablesToCurrentState() {
if (mBackground != null) {
mBackground.jumpToCurrentState();
}
if (mStateListAnimator != null) {
mStateListAnimator.jumpToCurrentState();
}
if (mForegroundInfo != null && mForegroundInfo.mDrawable != null) {
mForegroundInfo.mDrawable.jumpToCurrentState();
}
}
/**
* Sets the background color for this view.
* @param color the color of the background
*/
@RemotableViewMethod
public void setBackgroundColor(@ColorInt int color) {
if (mBackground instanceof ColorDrawable) {
((ColorDrawable) mBackground.mutate()).setColor(color);
computeOpaqueFlags();
mBackgroundResource = 0;
} else {
setBackground(new ColorDrawable(color));
}
}
/**
* Set the background to a given resource. The resource should refer to
* a Drawable object or 0 to remove the background.
* @param resid The identifier of the resource.
*
* @attr ref android.R.styleable#View_background
*/
@RemotableViewMethod
public void setBackgroundResource(@DrawableRes int resid) {
if (resid != 0 && resid == mBackgroundResource) {
return;
}
Drawable d = null;
if (resid != 0) {
d = mContext.getDrawable(resid);
}
setBackground(d);
mBackgroundResource = resid;
}
/**
* Set the background to a given Drawable, or remove the background. If the
* background has padding, this View's padding is set to the background's
* padding. However, when a background is removed, this View's padding isn't
* touched. If setting the padding is desired, please use
* {@link #setPadding(int, int, int, int)}.
*
* @param background The Drawable to use as the background, or null to remove the
* background
*/
public void setBackground(Drawable background) {
//noinspection deprecation
setBackgroundDrawable(background);
}
/**
* @deprecated use {@link #setBackground(Drawable)} instead
*/
@Deprecated
public void setBackgroundDrawable(Drawable background) {
computeOpaqueFlags();
if (background == mBackground) {
return;
}
boolean requestLayout = false;
mBackgroundResource = 0;
/*
* Regardless of whether we're setting a new background or not, we want
* to clear the previous drawable. setVisible first while we still have the callback set.
*/
if (mBackground != null) {
if (isAttachedToWindow()) {
mBackground.setVisible(false, false);
}
mBackground.setCallback(null);
unscheduleDrawable(mBackground);
}
if (background != null) {
Rect padding = sThreadLocal.get();
if (padding == null) {
padding = new Rect();
sThreadLocal.set(padding);
}
resetResolvedDrawablesInternal();
background.setLayoutDirection(getLayoutDirection());
if (background.getPadding(padding)) {
resetResolvedPaddingInternal();
switch (background.getLayoutDirection()) {
case LAYOUT_DIRECTION_RTL:
mUserPaddingLeftInitial = padding.right;
mUserPaddingRightInitial = padding.left;
internalSetPadding(padding.right, padding.top, padding.left, padding.bottom);
break;
case LAYOUT_DIRECTION_LTR:
default:
mUserPaddingLeftInitial = padding.left;
mUserPaddingRightInitial = padding.right;
internalSetPadding(padding.left, padding.top, padding.right, padding.bottom);
}
mLeftPaddingDefined = false;
mRightPaddingDefined = false;
}
// Compare the minimum sizes of the old Drawable and the new. If there isn't an old or
// if it has a different minimum size, we should layout again
if (mBackground == null
|| mBackground.getMinimumHeight() != background.getMinimumHeight()
|| mBackground.getMinimumWidth() != background.getMinimumWidth()) {
requestLayout = true;
}
// Set mBackground before we set this as the callback and start making other
// background drawable state change calls. In particular, the setVisible call below
// can result in drawables attempting to start animations or otherwise invalidate,
// which requires the view set as the callback (us) to recognize the drawable as
// belonging to it as per verifyDrawable.
mBackground = background;
if (background.isStateful()) {
background.setState(getDrawableState());
}
if (isAttachedToWindow()) {
background.setVisible(getWindowVisibility() == VISIBLE && isShown(), false);
}
applyBackgroundTint();
// Set callback last, since the view may still be initializing.
background.setCallback(this);
if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) {
mPrivateFlags &= ~PFLAG_SKIP_DRAW;
requestLayout = true;
}
} else {
/* Remove the background */
mBackground = null;
if ((mViewFlags & WILL_NOT_DRAW) != 0
&& (mForegroundInfo == null || mForegroundInfo.mDrawable == null)) {
mPrivateFlags |= PFLAG_SKIP_DRAW;
}
/*
* When the background is set, we try to apply its padding to this
* View. When the background is removed, we don't touch this View's
* padding. This is noted in the Javadocs. Hence, we don't need to
* requestLayout(), the invalidate() below is sufficient.
*/
// The old background's minimum size could have affected this
// View's layout, so let's requestLayout
requestLayout = true;
}
computeOpaqueFlags();
if (requestLayout) {
requestLayout();
}
mBackgroundSizeChanged = true;
invalidate(true);
invalidateOutline();
}
/**
* Gets the background drawable
*
* @return The drawable used as the background for this view, if any.
*
* @see #setBackground(Drawable)
*
* @attr ref android.R.styleable#View_background
*/
public Drawable getBackground() {
return mBackground;
}
/**
* Applies a tint to the background drawable. Does not modify the current tint
* mode, which is {@link PorterDuff.Mode#SRC_IN} by default.
* <p>
* Subsequent calls to {@link #setBackground(Drawable)} will automatically
* mutate the drawable and apply the specified tint and tint mode using
* {@link Drawable#setTintList(ColorStateList)}.
*
* @param tint the tint to apply, may be {@code null} to clear tint
*
* @attr ref android.R.styleable#View_backgroundTint
* @see #getBackgroundTintList()
* @see Drawable#setTintList(ColorStateList)
*/
public void setBackgroundTintList(@Nullable ColorStateList tint) {
if (mBackgroundTint == null) {
mBackgroundTint = new TintInfo();
}
mBackgroundTint.mTintList = tint;
mBackgroundTint.mHasTintList = true;
applyBackgroundTint();
}
/**
* Return the tint applied to the background drawable, if specified.
*
* @return the tint applied to the background drawable
* @attr ref android.R.styleable#View_backgroundTint
* @see #setBackgroundTintList(ColorStateList)
*/
@Nullable
public ColorStateList getBackgroundTintList() {
return mBackgroundTint != null ? mBackgroundTint.mTintList : null;
}
/**
* Specifies the blending mode used to apply the tint specified by
* {@link #setBackgroundTintList(ColorStateList)}} to the background
* drawable. The default mode is {@link PorterDuff.Mode#SRC_IN}.
*
* @param tintMode the blending mode used to apply the tint, may be
* {@code null} to clear tint
* @attr ref android.R.styleable#View_backgroundTintMode
* @see #getBackgroundTintMode()
* @see Drawable#setTintMode(PorterDuff.Mode)
*/
public void setBackgroundTintMode(@Nullable PorterDuff.Mode tintMode) {
if (mBackgroundTint == null) {
mBackgroundTint = new TintInfo();
}
mBackgroundTint.mTintMode = tintMode;
mBackgroundTint.mHasTintMode = true;
applyBackgroundTint();
}
/**
* Return the blending mode used to apply the tint to the background
* drawable, if specified.
*
* @return the blending mode used to apply the tint to the background
* drawable
* @attr ref android.R.styleable#View_backgroundTintMode
* @see #setBackgroundTintMode(PorterDuff.Mode)
*/
@Nullable
public PorterDuff.Mode getBackgroundTintMode() {
return mBackgroundTint != null ? mBackgroundTint.mTintMode : null;
}
private void applyBackgroundTint() {
if (mBackground != null && mBackgroundTint != null) {
final TintInfo tintInfo = mBackgroundTint;
if (tintInfo.mHasTintList || tintInfo.mHasTintMode) {
mBackground = mBackground.mutate();
if (tintInfo.mHasTintList) {
mBackground.setTintList(tintInfo.mTintList);
}
if (tintInfo.mHasTintMode) {
mBackground.setTintMode(tintInfo.mTintMode);
}
// The drawable (or one of its children) may not have been
// stateful before applying the tint, so let's try again.
if (mBackground.isStateful()) {
mBackground.setState(getDrawableState());
}
}
}
}
/**
* Returns the drawable used as the foreground of this View. The
* foreground drawable, if non-null, is always drawn on top of the view's content.
*
* @return a Drawable or null if no foreground was set
*
* @see #onDrawForeground(Canvas)
*/
public Drawable getForeground() {
return mForegroundInfo != null ? mForegroundInfo.mDrawable : null;
}
/**
* Supply a Drawable that is to be rendered on top of all of the content in the view.
*
* @param foreground the Drawable to be drawn on top of the children
*
* @attr ref android.R.styleable#View_foreground
*/
public void setForeground(Drawable foreground) {
if (mForegroundInfo == null) {
if (foreground == null) {
// Nothing to do.
return;
}
mForegroundInfo = new ForegroundInfo();
}
if (foreground == mForegroundInfo.mDrawable) {
// Nothing to do
return;
}
if (mForegroundInfo.mDrawable != null) {
if (isAttachedToWindow()) {
mForegroundInfo.mDrawable.setVisible(false, false);
}
mForegroundInfo.mDrawable.setCallback(null);
unscheduleDrawable(mForegroundInfo.mDrawable);
}
mForegroundInfo.mDrawable = foreground;
mForegroundInfo.mBoundsChanged = true;
if (foreground != null) {
if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) {
mPrivateFlags &= ~PFLAG_SKIP_DRAW;
}
foreground.setLayoutDirection(getLayoutDirection());
if (foreground.isStateful()) {
foreground.setState(getDrawableState());
}
applyForegroundTint();
if (isAttachedToWindow()) {
foreground.setVisible(getWindowVisibility() == VISIBLE && isShown(), false);
}
// Set callback last, since the view may still be initializing.
foreground.setCallback(this);
} else if ((mViewFlags & WILL_NOT_DRAW) != 0 && mBackground == null) {
mPrivateFlags |= PFLAG_SKIP_DRAW;
}
requestLayout();
invalidate();
}
/**
* Magic bit used to support features of framework-internal window decor implementation details.
* This used to live exclusively in FrameLayout.
*
* @return true if the foreground should draw inside the padding region or false
* if it should draw inset by the view's padding
* @hide internal use only; only used by FrameLayout and internal screen layouts.
*/
public boolean isForegroundInsidePadding() {
return mForegroundInfo != null ? mForegroundInfo.mInsidePadding : true;
}
/**
* Describes how the foreground is positioned.
*
* @return foreground gravity.
*
* @see #setForegroundGravity(int)
*
* @attr ref android.R.styleable#View_foregroundGravity
*/
public int getForegroundGravity() {
return mForegroundInfo != null ? mForegroundInfo.mGravity
: Gravity.START | Gravity.TOP;
}
/**
* Describes how the foreground is positioned. Defaults to START and TOP.
*
* @param gravity see {@link android.view.Gravity}
*
* @see #getForegroundGravity()
*
* @attr ref android.R.styleable#View_foregroundGravity
*/
public void setForegroundGravity(int gravity) {
if (mForegroundInfo == null) {
mForegroundInfo = new ForegroundInfo();
}
if (mForegroundInfo.mGravity != gravity) {
if ((gravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) {
gravity |= Gravity.START;
}
if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) {
gravity |= Gravity.TOP;
}
mForegroundInfo.mGravity = gravity;
requestLayout();
}
}
/**
* Applies a tint to the foreground drawable. Does not modify the current tint
* mode, which is {@link PorterDuff.Mode#SRC_IN} by default.
* <p>
* Subsequent calls to {@link #setForeground(Drawable)} will automatically
* mutate the drawable and apply the specified tint and tint mode using
* {@link Drawable#setTintList(ColorStateList)}.
*
* @param tint the tint to apply, may be {@code null} to clear tint
*
* @attr ref android.R.styleable#View_foregroundTint
* @see #getForegroundTintList()
* @see Drawable#setTintList(ColorStateList)
*/
public void setForegroundTintList(@Nullable ColorStateList tint) {
if (mForegroundInfo == null) {
mForegroundInfo = new ForegroundInfo();
}
if (mForegroundInfo.mTintInfo == null) {
mForegroundInfo.mTintInfo = new TintInfo();
}
mForegroundInfo.mTintInfo.mTintList = tint;
mForegroundInfo.mTintInfo.mHasTintList = true;
applyForegroundTint();
}
/**
* Return the tint applied to the foreground drawable, if specified.
*
* @return the tint applied to the foreground drawable
* @attr ref android.R.styleable#View_foregroundTint
* @see #setForegroundTintList(ColorStateList)
*/
@Nullable
public ColorStateList getForegroundTintList() {
return mForegroundInfo != null && mForegroundInfo.mTintInfo != null
? mForegroundInfo.mTintInfo.mTintList : null;
}
/**
* Specifies the blending mode used to apply the tint specified by
* {@link #setForegroundTintList(ColorStateList)}} to the background
* drawable. The default mode is {@link PorterDuff.Mode#SRC_IN}.
*
* @param tintMode the blending mode used to apply the tint, may be
* {@code null} to clear tint
* @attr ref android.R.styleable#View_foregroundTintMode
* @see #getForegroundTintMode()
* @see Drawable#setTintMode(PorterDuff.Mode)
*/
public void setForegroundTintMode(@Nullable PorterDuff.Mode tintMode) {
if (mForegroundInfo == null) {
mForegroundInfo = new ForegroundInfo();
}
if (mForegroundInfo.mTintInfo == null) {
mForegroundInfo.mTintInfo = new TintInfo();
}
mForegroundInfo.mTintInfo.mTintMode = tintMode;
mForegroundInfo.mTintInfo.mHasTintMode = true;
applyForegroundTint();
}
/**
* Return the blending mode used to apply the tint to the foreground
* drawable, if specified.
*
* @return the blending mode used to apply the tint to the foreground
* drawable
* @attr ref android.R.styleable#View_foregroundTintMode
* @see #setForegroundTintMode(PorterDuff.Mode)
*/
@Nullable
public PorterDuff.Mode getForegroundTintMode() {
return mForegroundInfo != null && mForegroundInfo.mTintInfo != null
? mForegroundInfo.mTintInfo.mTintMode : null;
}
private void applyForegroundTint() {
if (mForegroundInfo != null && mForegroundInfo.mDrawable != null
&& mForegroundInfo.mTintInfo != null) {
final TintInfo tintInfo = mForegroundInfo.mTintInfo;
if (tintInfo.mHasTintList || tintInfo.mHasTintMode) {
mForegroundInfo.mDrawable = mForegroundInfo.mDrawable.mutate();
if (tintInfo.mHasTintList) {
mForegroundInfo.mDrawable.setTintList(tintInfo.mTintList);
}
if (tintInfo.mHasTintMode) {
mForegroundInfo.mDrawable.setTintMode(tintInfo.mTintMode);
}
// The drawable (or one of its children) may not have been
// stateful before applying the tint, so let's try again.
if (mForegroundInfo.mDrawable.isStateful()) {
mForegroundInfo.mDrawable.setState(getDrawableState());
}
}
}
}
/**
* Draw any foreground content for this view.
*
* <p>Foreground content may consist of scroll bars, a {@link #setForeground foreground}
* drawable or other view-specific decorations. The foreground is drawn on top of the
* primary view content.</p>
*
* @param canvas canvas to draw into
*/
public void onDrawForeground(Canvas canvas) {
onDrawScrollIndicators(canvas);
onDrawScrollBars(canvas);
final Drawable foreground = mForegroundInfo != null ? mForegroundInfo.mDrawable : null;
if (foreground != null) {
if (mForegroundInfo.mBoundsChanged) {
mForegroundInfo.mBoundsChanged = false;
final Rect selfBounds = mForegroundInfo.mSelfBounds;
final Rect overlayBounds = mForegroundInfo.mOverlayBounds;
if (mForegroundInfo.mInsidePadding) {
selfBounds.set(0, 0, getWidth(), getHeight());
} else {
selfBounds.set(getPaddingLeft(), getPaddingTop(),
getWidth() - getPaddingRight(), getHeight() - getPaddingBottom());
}
final int ld = getLayoutDirection();
Gravity.apply(mForegroundInfo.mGravity, foreground.getIntrinsicWidth(),
foreground.getIntrinsicHeight(), selfBounds, overlayBounds, ld);
foreground.setBounds(overlayBounds);
}
foreground.draw(canvas);
}
}
/**
* Sets the padding. The view may add on the space required to display
* the scrollbars, depending on the style and visibility of the scrollbars.
* So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop},
* {@link #getPaddingRight} and {@link #getPaddingBottom} may be different
* from the values set in this call.
*
* @attr ref android.R.styleable#View_padding
* @attr ref android.R.styleable#View_paddingBottom
* @attr ref android.R.styleable#View_paddingLeft
* @attr ref android.R.styleable#View_paddingRight
* @attr ref android.R.styleable#View_paddingTop
* @param left the left padding in pixels
* @param top the top padding in pixels
* @param right the right padding in pixels
* @param bottom the bottom padding in pixels
*/
public void setPadding(int left, int top, int right, int bottom) {
resetResolvedPaddingInternal();
mUserPaddingStart = UNDEFINED_PADDING;
mUserPaddingEnd = UNDEFINED_PADDING;
mUserPaddingLeftInitial = left;
mUserPaddingRightInitial = right;
mLeftPaddingDefined = true;
mRightPaddingDefined = true;
internalSetPadding(left, top, right, bottom);
}
/**
* @hide
*/
protected void internalSetPadding(int left, int top, int right, int bottom) {
mUserPaddingLeft = left;
mUserPaddingRight = right;
mUserPaddingBottom = bottom;
final int viewFlags = mViewFlags;
boolean changed = false;
// Common case is there are no scroll bars.
if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) {
if ((viewFlags & SCROLLBARS_VERTICAL) != 0) {
final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0
? 0 : getVerticalScrollbarWidth();
switch (mVerticalScrollbarPosition) {
case SCROLLBAR_POSITION_DEFAULT:
if (isLayoutRtl()) {
left += offset;
} else {
right += offset;
}
break;
case SCROLLBAR_POSITION_RIGHT:
right += offset;
break;
case SCROLLBAR_POSITION_LEFT:
left += offset;
break;
}
}
if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) {
bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0
? 0 : getHorizontalScrollbarHeight();
}
}
if (mPaddingLeft != left) {
changed = true;
mPaddingLeft = left;
}
if (mPaddingTop != top) {
changed = true;
mPaddingTop = top;
}
if (mPaddingRight != right) {
changed = true;
mPaddingRight = right;
}
if (mPaddingBottom != bottom) {
changed = true;
mPaddingBottom = bottom;
}
if (changed) {
requestLayout();
invalidateOutline();
}
}
/**
* Sets the relative padding. The view may add on the space required to display
* the scrollbars, depending on the style and visibility of the scrollbars.
* So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop},
* {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different
* from the values set in this call.
*
* @attr ref android.R.styleable#View_padding
* @attr ref android.R.styleable#View_paddingBottom
* @attr ref android.R.styleable#View_paddingStart
* @attr ref android.R.styleable#View_paddingEnd
* @attr ref android.R.styleable#View_paddingTop
* @param start the start padding in pixels
* @param top the top padding in pixels
* @param end the end padding in pixels
* @param bottom the bottom padding in pixels
*/
public void setPaddingRelative(int start, int top, int end, int bottom) {
resetResolvedPaddingInternal();
mUserPaddingStart = start;
mUserPaddingEnd = end;
mLeftPaddingDefined = true;
mRightPaddingDefined = true;
switch(getLayoutDirection()) {
case LAYOUT_DIRECTION_RTL:
mUserPaddingLeftInitial = end;
mUserPaddingRightInitial = start;
internalSetPadding(end, top, start, bottom);
break;
case LAYOUT_DIRECTION_LTR:
default:
mUserPaddingLeftInitial = start;
mUserPaddingRightInitial = end;
internalSetPadding(start, top, end, bottom);
}
}
/**
* Returns the top padding of this view.
*
* @return the top padding in pixels
*/
public int getPaddingTop() {
return mPaddingTop;
}
/**
* Returns the bottom padding of this view. If there are inset and enabled
* scrollbars, this value may include the space required to display the
* scrollbars as well.
*
* @return the bottom padding in pixels
*/
public int getPaddingBottom() {
return mPaddingBottom;
}
/**
* Returns the left padding of this view. If there are inset and enabled
* scrollbars, this value may include the space required to display the
* scrollbars as well.
*
* @return the left padding in pixels
*/
public int getPaddingLeft() {
if (!isPaddingResolved()) {
resolvePadding();
}
return mPaddingLeft;
}
/**
* Returns the start padding of this view depending on its resolved layout direction.
* If there are inset and enabled scrollbars, this value may include the space
* required to display the scrollbars as well.
*
* @return the start padding in pixels
*/
public int getPaddingStart() {
if (!isPaddingResolved()) {
resolvePadding();
}
return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ?
mPaddingRight : mPaddingLeft;
}
/**
* Returns the right padding of this view. If there are inset and enabled
* scrollbars, this value may include the space required to display the
* scrollbars as well.
*
* @return the right padding in pixels
*/
public int getPaddingRight() {
if (!isPaddingResolved()) {
resolvePadding();
}
return mPaddingRight;
}
/**
* Returns the end padding of this view depending on its resolved layout direction.
* If there are inset and enabled scrollbars, this value may include the space
* required to display the scrollbars as well.
*
* @return the end padding in pixels
*/
public int getPaddingEnd() {
if (!isPaddingResolved()) {
resolvePadding();
}
return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ?
mPaddingLeft : mPaddingRight;
}
/**
* Return if the padding has been set through relative values
* {@link #setPaddingRelative(int, int, int, int)} or through
* @attr ref android.R.styleable#View_paddingStart or
* @attr ref android.R.styleable#View_paddingEnd
*
* @return true if the padding is relative or false if it is not.
*/
public boolean isPaddingRelative() {
return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING);
}
Insets computeOpticalInsets() {
return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets();
}
/**
* @hide
*/
public void resetPaddingToInitialValues() {
if (isRtlCompatibilityMode()) {
mPaddingLeft = mUserPaddingLeftInitial;
mPaddingRight = mUserPaddingRightInitial;
return;
}
if (isLayoutRtl()) {
mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial;
mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial;
} else {
mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial;
mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial;
}
}
/**
* @hide
*/
public Insets getOpticalInsets() {
if (mLayoutInsets == null) {
mLayoutInsets = computeOpticalInsets();
}
return mLayoutInsets;
}
/**
* Set this view's optical insets.
*
* <p>This method should be treated similarly to setMeasuredDimension and not as a general
* property. Views that compute their own optical insets should call it as part of measurement.
* This method does not request layout. If you are setting optical insets outside of
* measure/layout itself you will want to call requestLayout() yourself.
* </p>
* @hide
*/
public void setOpticalInsets(Insets insets) {
mLayoutInsets = insets;
}
/**
* Changes the selection state of this view. A view can be selected or not.
* Note that selection is not the same as focus. Views are typically
* selected in the context of an AdapterView like ListView or GridView;
* the selected view is the view that is highlighted.
*
* @param selected true if the view must be selected, false otherwise
*/
public void setSelected(boolean selected) {
//noinspection DoubleNegation
if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) {
mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0);
if (!selected) resetPressedState();
invalidate(true);
refreshDrawableState();
dispatchSetSelected(selected);
if (selected) {
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
} else {
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
}
}
/**
* Dispatch setSelected to all of this View's children.
*
* @see #setSelected(boolean)
*
* @param selected The new selected state
*/
protected void dispatchSetSelected(boolean selected) {
}
/**
* Indicates the selection state of this view.
*
* @return true if the view is selected, false otherwise
*/
@ViewDebug.ExportedProperty
public boolean isSelected() {
return (mPrivateFlags & PFLAG_SELECTED) != 0;
}
/**
* Changes the activated state of this view. A view can be activated or not.
* Note that activation is not the same as selection. Selection is
* a transient property, representing the view (hierarchy) the user is
* currently interacting with. Activation is a longer-term state that the
* user can move views in and out of. For example, in a list view with
* single or multiple selection enabled, the views in the current selection
* set are activated. (Um, yeah, we are deeply sorry about the terminology
* here.) The activated state is propagated down to children of the view it
* is set on.
*
* @param activated true if the view must be activated, false otherwise
*/
public void setActivated(boolean activated) {
//noinspection DoubleNegation
if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) {
mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0);
invalidate(true);
refreshDrawableState();
dispatchSetActivated(activated);
}
}
/**
* Dispatch setActivated to all of this View's children.
*
* @see #setActivated(boolean)
*
* @param activated The new activated state
*/
protected void dispatchSetActivated(boolean activated) {
}
/**
* Indicates the activation state of this view.
*
* @return true if the view is activated, false otherwise
*/
@ViewDebug.ExportedProperty
public boolean isActivated() {
return (mPrivateFlags & PFLAG_ACTIVATED) != 0;
}
/**
* Returns the ViewTreeObserver for this view's hierarchy. The view tree
* observer can be used to get notifications when global events, like
* layout, happen.
*
* The returned ViewTreeObserver observer is not guaranteed to remain
* valid for the lifetime of this View. If the caller of this method keeps
* a long-lived reference to ViewTreeObserver, it should always check for
* the return value of {@link ViewTreeObserver#isAlive()}.
*
* @return The ViewTreeObserver for this view's hierarchy.
*/
public ViewTreeObserver getViewTreeObserver() {
if (mAttachInfo != null) {
return mAttachInfo.mTreeObserver;
}
if (mFloatingTreeObserver == null) {
mFloatingTreeObserver = new ViewTreeObserver();
}
return mFloatingTreeObserver;
}
/**
* <p>Finds the topmost view in the current view hierarchy.</p>
*
* @return the topmost view containing this view
*/
public View getRootView() {
if (mAttachInfo != null) {
final View v = mAttachInfo.mRootView;
if (v != null) {
return v;
}
}
View parent = this;
while (parent.mParent != null && parent.mParent instanceof View) {
parent = (View) parent.mParent;
}
return parent;
}
/**
* Transforms a motion event from view-local coordinates to on-screen
* coordinates.
*
* @param ev the view-local motion event
* @return false if the transformation could not be applied
* @hide
*/
public boolean toGlobalMotionEvent(MotionEvent ev) {
final AttachInfo info = mAttachInfo;
if (info == null) {
return false;
}
final Matrix m = info.mTmpMatrix;
m.set(Matrix.IDENTITY_MATRIX);
transformMatrixToGlobal(m);
ev.transform(m);
return true;
}
/**
* Transforms a motion event from on-screen coordinates to view-local
* coordinates.
*
* @param ev the on-screen motion event
* @return false if the transformation could not be applied
* @hide
*/
public boolean toLocalMotionEvent(MotionEvent ev) {
final AttachInfo info = mAttachInfo;
if (info == null) {
return false;
}
final Matrix m = info.mTmpMatrix;
m.set(Matrix.IDENTITY_MATRIX);
transformMatrixToLocal(m);
ev.transform(m);
return true;
}
/**
* Modifies the input matrix such that it maps view-local coordinates to
* on-screen coordinates.
*
* @param m input matrix to modify
* @hide
*/
public void transformMatrixToGlobal(Matrix m) {
final ViewParent parent = mParent;
if (parent instanceof View) {
final View vp = (View) parent;
vp.transformMatrixToGlobal(m);
m.preTranslate(-vp.mScrollX, -vp.mScrollY);
} else if (parent instanceof ViewRootImpl) {
final ViewRootImpl vr = (ViewRootImpl) parent;
vr.transformMatrixToGlobal(m);
m.preTranslate(0, -vr.mCurScrollY);
}
m.preTranslate(mLeft, mTop);
if (!hasIdentityMatrix()) {
m.preConcat(getMatrix());
}
}
/**
* Modifies the input matrix such that it maps on-screen coordinates to
* view-local coordinates.
*
* @param m input matrix to modify
* @hide
*/
public void transformMatrixToLocal(Matrix m) {
final ViewParent parent = mParent;
if (parent instanceof View) {
final View vp = (View) parent;
vp.transformMatrixToLocal(m);
m.postTranslate(vp.mScrollX, vp.mScrollY);
} else if (parent instanceof ViewRootImpl) {
final ViewRootImpl vr = (ViewRootImpl) parent;
vr.transformMatrixToLocal(m);
m.postTranslate(0, vr.mCurScrollY);
}
m.postTranslate(-mLeft, -mTop);
if (!hasIdentityMatrix()) {
m.postConcat(getInverseMatrix());
}
}
/**
* @hide
*/
@ViewDebug.ExportedProperty(category = "layout", indexMapping = {
@ViewDebug.IntToString(from = 0, to = "x"),
@ViewDebug.IntToString(from = 1, to = "y")
})
public int[] getLocationOnScreen() {
int[] location = new int[2];
getLocationOnScreen(location);
return location;
}
/**
* <p>Computes the coordinates of this view on the screen. The argument
* must be an array of two integers. After the method returns, the array
* contains the x and y location in that order.</p>
*
* @param outLocation an array of two integers in which to hold the coordinates
*/
public void getLocationOnScreen(@Size(2) int[] outLocation) {
getLocationInWindow(outLocation);
final AttachInfo info = mAttachInfo;
if (info != null) {
outLocation[0] += info.mWindowLeft;
outLocation[1] += info.mWindowTop;
}
}
/**
* <p>Computes the coordinates of this view in its window. The argument
* must be an array of two integers. After the method returns, the array
* contains the x and y location in that order.</p>
*
* @param outLocation an array of two integers in which to hold the coordinates
*/
public void getLocationInWindow(@Size(2) int[] outLocation) {
if (outLocation == null || outLocation.length < 2) {
throw new IllegalArgumentException("outLocation must be an array of two integers");
}
outLocation[0] = 0;
outLocation[1] = 0;
transformFromViewToWindowSpace(outLocation);
}
/** @hide */
public void transformFromViewToWindowSpace(@Size(2) int[] inOutLocation) {
if (inOutLocation == null || inOutLocation.length < 2) {
throw new IllegalArgumentException("inOutLocation must be an array of two integers");
}
if (mAttachInfo == null) {
// When the view is not attached to a window, this method does not make sense
inOutLocation[0] = inOutLocation[1] = 0;
return;
}
float position[] = mAttachInfo.mTmpTransformLocation;
position[0] = inOutLocation[0];
position[1] = inOutLocation[1];
if (!hasIdentityMatrix()) {
getMatrix().mapPoints(position);
}
position[0] += mLeft;
position[1] += mTop;
ViewParent viewParent = mParent;
while (viewParent instanceof View) {
final View view = (View) viewParent;
position[0] -= view.mScrollX;
position[1] -= view.mScrollY;
if (!view.hasIdentityMatrix()) {
view.getMatrix().mapPoints(position);
}
position[0] += view.mLeft;
position[1] += view.mTop;
viewParent = view.mParent;
}
if (viewParent instanceof ViewRootImpl) {
// *cough*
final ViewRootImpl vr = (ViewRootImpl) viewParent;
position[1] -= vr.mCurScrollY;
}
inOutLocation[0] = Math.round(position[0]);
inOutLocation[1] = Math.round(position[1]);
}
/**
* {@hide}
* @param id the id of the view to be found
* @return the view of the specified id, null if cannot be found
*/
protected View findViewTraversal(@IdRes int id) {
if (id == mID) {
return this;
}
return null;
}
/**
* {@hide}
* @param tag the tag of the view to be found
* @return the view of specified tag, null if cannot be found
*/
protected View findViewWithTagTraversal(Object tag) {
if (tag != null && tag.equals(mTag)) {
return this;
}
return null;
}
/**
* {@hide}
* @param predicate The predicate to evaluate.
* @param childToSkip If not null, ignores this child during the recursive traversal.
* @return The first view that matches the predicate or null.
*/
protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) {
if (predicate.test(this)) {
return this;
}
return null;
}
/**
* Look for a child view with the given id. If this view has the given
* id, return this view.
*
* @param id The id to search for.
* @return The view that has the given id in the hierarchy or null
*/
@Nullable
public final View findViewById(@IdRes int id) {
if (id < 0) {
return null;
}
return findViewTraversal(id);
}
/**
* Finds a view by its unuque and stable accessibility id.
*
* @param accessibilityId The searched accessibility id.
* @return The found view.
*/
final View findViewByAccessibilityId(int accessibilityId) {
if (accessibilityId < 0) {
return null;
}
View view = findViewByAccessibilityIdTraversal(accessibilityId);
if (view != null) {
return view.includeForAccessibility() ? view : null;
}
return null;
}
/**
* Performs the traversal to find a view by its unuque and stable accessibility id.
*
* <strong>Note:</strong>This method does not stop at the root namespace
* boundary since the user can touch the screen at an arbitrary location
* potentially crossing the root namespace bounday which will send an
* accessibility event to accessibility services and they should be able
* to obtain the event source. Also accessibility ids are guaranteed to be
* unique in the window.
*
* @param accessibilityId The accessibility id.
* @return The found view.
*
* @hide
*/
public View findViewByAccessibilityIdTraversal(int accessibilityId) {
if (getAccessibilityViewId() == accessibilityId) {
return this;
}
return null;
}
/**
* Look for a child view with the given tag. If this view has the given
* tag, return this view.
*
* @param tag The tag to search for, using "tag.equals(getTag())".
* @return The View that has the given tag in the hierarchy or null
*/
public final View findViewWithTag(Object tag) {
if (tag == null) {
return null;
}
return findViewWithTagTraversal(tag);
}
/**
* {@hide}
* Look for a child view that matches the specified predicate.
* If this view matches the predicate, return this view.
*
* @param predicate The predicate to evaluate.
* @return The first view that matches the predicate or null.
*/
public final View findViewByPredicate(Predicate<View> predicate) {
return findViewByPredicateTraversal(predicate, null);
}
/**
* {@hide}
* Look for a child view that matches the specified predicate,
* starting with the specified view and its descendents and then
* recusively searching the ancestors and siblings of that view
* until this view is reached.
*
* This method is useful in cases where the predicate does not match
* a single unique view (perhaps multiple views use the same id)
* and we are trying to find the view that is "closest" in scope to the
* starting view.
*
* @param start The view to start from.
* @param predicate The predicate to evaluate.
* @return The first view that matches the predicate or null.
*/
public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) {
View childToSkip = null;
for (;;) {
View view = start.findViewByPredicateTraversal(predicate, childToSkip);
if (view != null || start == this) {
return view;
}
ViewParent parent = start.getParent();
if (parent == null || !(parent instanceof View)) {
return null;
}
childToSkip = start;
start = (View) parent;
}
}
/**
* Sets the identifier for this view. The identifier does not have to be
* unique in this view's hierarchy. The identifier should be a positive
* number.
*
* @see #NO_ID
* @see #getId()
* @see #findViewById(int)
*
* @param id a number used to identify the view
*
* @attr ref android.R.styleable#View_id
*/
public void setId(@IdRes int id) {
mID = id;
if (mID == View.NO_ID && mLabelForId != View.NO_ID) {
mID = generateViewId();
}
}
/**
* {@hide}
*
* @param isRoot true if the view belongs to the root namespace, false
* otherwise
*/
public void setIsRootNamespace(boolean isRoot) {
if (isRoot) {
mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE;
} else {
mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE;
}
}
/**
* {@hide}
*
* @return true if the view belongs to the root namespace, false otherwise
*/
public boolean isRootNamespace() {
return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0;
}
/**
* Returns this view's identifier.
*
* @return a positive integer used to identify the view or {@link #NO_ID}
* if the view has no ID
*
* @see #setId(int)
* @see #findViewById(int)
* @attr ref android.R.styleable#View_id
*/
@IdRes
@ViewDebug.CapturedViewProperty
public int getId() {
return mID;
}
/**
* Returns this view's tag.
*
* @return the Object stored in this view as a tag, or {@code null} if not
* set
*
* @see #setTag(Object)
* @see #getTag(int)
*/
@ViewDebug.ExportedProperty
public Object getTag() {
return mTag;
}
/**
* Sets the tag associated with this view. A tag can be used to mark
* a view in its hierarchy and does not have to be unique within the
* hierarchy. Tags can also be used to store data within a view without
* resorting to another data structure.
*
* @param tag an Object to tag the view with
*
* @see #getTag()
* @see #setTag(int, Object)
*/
public void setTag(final Object tag) {
mTag = tag;
}
/**
* Returns the tag associated with this view and the specified key.
*
* @param key The key identifying the tag
*
* @return the Object stored in this view as a tag, or {@code null} if not
* set
*
* @see #setTag(int, Object)
* @see #getTag()
*/
public Object getTag(int key) {
if (mKeyedTags != null) return mKeyedTags.get(key);
return null;
}
/**
* Sets a tag associated with this view and a key. A tag can be used
* to mark a view in its hierarchy and does not have to be unique within
* the hierarchy. Tags can also be used to store data within a view
* without resorting to another data structure.
*
* The specified key should be an id declared in the resources of the
* application to ensure it is unique (see the <a
* href="{@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>).
* Keys identified as belonging to
* the Android framework or not associated with any package will cause
* an {@link IllegalArgumentException} to be thrown.
*
* @param key The key identifying the tag
* @param tag An Object to tag the view with
*
* @throws IllegalArgumentException If they specified key is not valid
*
* @see #setTag(Object)
* @see #getTag(int)
*/
public void setTag(int key, final Object tag) {
// If the package id is 0x00 or 0x01, it's either an undefined package
// or a framework id
if ((key >>> 24) < 2) {
throw new IllegalArgumentException("The key must be an application-specific "
+ "resource id.");
}
setKeyedTag(key, tag);
}
/**
* Variation of {@link #setTag(int, Object)} that enforces the key to be a
* framework id.
*
* @hide
*/
public void setTagInternal(int key, Object tag) {
if ((key >>> 24) != 0x1) {
throw new IllegalArgumentException("The key must be a framework-specific "
+ "resource id.");
}
setKeyedTag(key, tag);
}
private void setKeyedTag(int key, Object tag) {
if (mKeyedTags == null) {
mKeyedTags = new SparseArray<Object>(2);
}
mKeyedTags.put(key, tag);
}
/**
* Prints information about this view in the log output, with the tag
* {@link #VIEW_LOG_TAG}.
*
* @hide
*/
public void debug() {
debug(0);
}
/**
* Prints information about this view in the log output, with the tag
* {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an
* indentation defined by the <code>depth</code>.
*
* @param depth the indentation level
*
* @hide
*/
protected void debug(int depth) {
String output = debugIndent(depth - 1);
output += "+ " + this;
int id = getId();
if (id != -1) {
output += " (id=" + id + ")";
}
Object tag = getTag();
if (tag != null) {
output += " (tag=" + tag + ")";
}
Log.d(VIEW_LOG_TAG, output);
if ((mPrivateFlags & PFLAG_FOCUSED) != 0) {
output = debugIndent(depth) + " FOCUSED";
Log.d(VIEW_LOG_TAG, output);
}
output = debugIndent(depth);
output += "frame={" + mLeft + ", " + mTop + ", " + mRight
+ ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY
+ "} ";
Log.d(VIEW_LOG_TAG, output);
if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0
|| mPaddingBottom != 0) {
output = debugIndent(depth);
output += "padding={" + mPaddingLeft + ", " + mPaddingTop
+ ", " + mPaddingRight + ", " + mPaddingBottom + "}";
Log.d(VIEW_LOG_TAG, output);
}
output = debugIndent(depth);
output += "mMeasureWidth=" + mMeasuredWidth +
" mMeasureHeight=" + mMeasuredHeight;
Log.d(VIEW_LOG_TAG, output);
output = debugIndent(depth);
if (mLayoutParams == null) {
output += "BAD! no layout params";
} else {
output = mLayoutParams.debug(output);
}
Log.d(VIEW_LOG_TAG, output);
output = debugIndent(depth);
output += "flags={";
output += View.printFlags(mViewFlags);
output += "}";
Log.d(VIEW_LOG_TAG, output);
output = debugIndent(depth);
output += "privateFlags={";
output += View.printPrivateFlags(mPrivateFlags);
output += "}";
Log.d(VIEW_LOG_TAG, output);
}
/**
* Creates a string of whitespaces used for indentation.
*
* @param depth the indentation level
* @return a String containing (depth * 2 + 3) * 2 white spaces
*
* @hide
*/
protected static String debugIndent(int depth) {
StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2);
for (int i = 0; i < (depth * 2) + 3; i++) {
spaces.append(' ').append(' ');
}
return spaces.toString();
}
/**
* <p>Return the offset of the widget's text baseline from the widget's top
* boundary. If this widget does not support baseline alignment, this
* method returns -1. </p>
*
* @return the offset of the baseline within the widget's bounds or -1
* if baseline alignment is not supported
*/
@ViewDebug.ExportedProperty(category = "layout")
public int getBaseline() {
return -1;
}
/**
* Returns whether the view hierarchy is currently undergoing a layout pass. This
* information is useful to avoid situations such as calling {@link #requestLayout()} during
* a layout pass.
*
* @return whether the view hierarchy is currently undergoing a layout pass
*/
public boolean isInLayout() {
ViewRootImpl viewRoot = getViewRootImpl();
return (viewRoot != null && viewRoot.isInLayout());
}
/**
* Call this when something has changed which has invalidated the
* layout of this view. This will schedule a layout pass of the view
* tree. This should not be called while the view hierarchy is currently in a layout
* pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the
* end of the current layout pass (and then layout will run again) or after the current
* frame is drawn and the next layout occurs.
*
* <p>Subclasses which override this method should call the superclass method to
* handle possible request-during-layout errors correctly.</p>
*/
@CallSuper
public void requestLayout() {
if (mMeasureCache != null) mMeasureCache.clear();
if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) {
// Only trigger request-during-layout logic if this is the view requesting it,
// not the views in its parent hierarchy
ViewRootImpl viewRoot = getViewRootImpl();
if (viewRoot != null && viewRoot.isInLayout()) {
if (!viewRoot.requestLayoutDuringLayout(this)) {
return;
}
}
mAttachInfo.mViewRequestingLayout = this;
}
mPrivateFlags |= PFLAG_FORCE_LAYOUT;
mPrivateFlags |= PFLAG_INVALIDATED;
if (mParent != null && !mParent.isLayoutRequested()) {
mParent.requestLayout();
}
if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) {
mAttachInfo.mViewRequestingLayout = null;
}
}
/**
* Forces this view to be laid out during the next layout pass.
* This method does not call requestLayout() or forceLayout()
* on the parent.
*/
public void forceLayout() {
if (mMeasureCache != null) mMeasureCache.clear();
mPrivateFlags |= PFLAG_FORCE_LAYOUT;
mPrivateFlags |= PFLAG_INVALIDATED;
}
/**
* <p>
* This is called to find out how big a view should be. The parent
* supplies constraint information in the width and height parameters.
* </p>
*
* <p>
* The actual measurement work of a view is performed in
* {@link #onMeasure(int, int)}, called by this method. Therefore, only
* {@link #onMeasure(int, int)} can and must be overridden by subclasses.
* </p>
*
*
* @param widthMeasureSpec Horizontal space requirements as imposed by the
* parent
* @param heightMeasureSpec Vertical space requirements as imposed by the
* parent
*
* @see #onMeasure(int, int)
*/
public final void measure(int widthMeasureSpec, int heightMeasureSpec) {
boolean optical = isLayoutModeOptical(this);
if (optical != isLayoutModeOptical(mParent)) {
Insets insets = getOpticalInsets();
int oWidth = insets.left + insets.right;
int oHeight = insets.top + insets.bottom;
widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth);
heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight);
}
// Suppress sign extension for the low bytes
long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL;
if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2);
final boolean forceLayout = (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT;
// Optimize layout by avoiding an extra EXACTLY pass when the view is
// already measured as the correct size. In API 23 and below, this
// extra pass is required to make LinearLayout re-distribute weight.
final boolean specChanged = widthMeasureSpec != mOldWidthMeasureSpec
|| heightMeasureSpec != mOldHeightMeasureSpec;
final boolean isSpecExactly = MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY
&& MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.EXACTLY;
final boolean matchesSpecSize = getMeasuredWidth() == MeasureSpec.getSize(widthMeasureSpec)
&& getMeasuredHeight() == MeasureSpec.getSize(heightMeasureSpec);
final boolean needsLayout = specChanged
&& (sAlwaysRemeasureExactly || !isSpecExactly || !matchesSpecSize);
if (forceLayout || needsLayout) {
// first clears the measured dimension flag
mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET;
resolveRtlPropertiesIfNeeded();
int cacheIndex = forceLayout ? -1 : mMeasureCache.indexOfKey(key);
if (cacheIndex < 0 || sIgnoreMeasureCache) {
// measure ourselves, this should set the measured dimension flag back
onMeasure(widthMeasureSpec, heightMeasureSpec);
mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
} else {
long value = mMeasureCache.valueAt(cacheIndex);
// Casting a long to int drops the high 32 bits, no mask needed
setMeasuredDimensionRaw((int) (value >> 32), (int) value);
mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT;
}
// flag not set, setMeasuredDimension() was not invoked, we raise
// an exception to warn the developer
if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) {
throw new IllegalStateException("View with id " + getId() + ": "
+ getClass().getName() + "#onMeasure() did not set the"
+ " measured dimension by calling"
+ " setMeasuredDimension()");
}
mPrivateFlags |= PFLAG_LAYOUT_REQUIRED;
}
mOldWidthMeasureSpec = widthMeasureSpec;
mOldHeightMeasureSpec = heightMeasureSpec;
mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 |
(long) mMeasuredHeight & 0xffffffffL); // suppress sign extension
}
/**
* <p>
* Measure the view and its content to determine the measured width and the
* measured height. This method is invoked by {@link #measure(int, int)} and
* should be overridden by subclasses to provide accurate and efficient
* measurement of their contents.
* </p>
*
* <p>
* <strong>CONTRACT:</strong> When overriding this method, you
* <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the
* measured width and height of this view. Failure to do so will trigger an
* <code>IllegalStateException</code>, thrown by
* {@link #measure(int, int)}. Calling the superclass'
* {@link #onMeasure(int, int)} is a valid use.
* </p>
*
* <p>
* The base class implementation of measure defaults to the background size,
* unless a larger size is allowed by the MeasureSpec. Subclasses should
* override {@link #onMeasure(int, int)} to provide better measurements of
* their content.
* </p>
*
* <p>
* If this method is overridden, it is the subclass's responsibility to make
* sure the measured height and width are at least the view's minimum height
* and width ({@link #getSuggestedMinimumHeight()} and
* {@link #getSuggestedMinimumWidth()}).
* </p>
*
* @param widthMeasureSpec horizontal space requirements as imposed by the parent.
* The requirements are encoded with
* {@link android.view.View.MeasureSpec}.
* @param heightMeasureSpec vertical space requirements as imposed by the parent.
* The requirements are encoded with
* {@link android.view.View.MeasureSpec}.
*
* @see #getMeasuredWidth()
* @see #getMeasuredHeight()
* @see #setMeasuredDimension(int, int)
* @see #getSuggestedMinimumHeight()
* @see #getSuggestedMinimumWidth()
* @see android.view.View.MeasureSpec#getMode(int)
* @see android.view.View.MeasureSpec#getSize(int)
*/
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec),
getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec));
}
/**
* <p>This method must be called by {@link #onMeasure(int, int)} to store the
* measured width and measured height. Failing to do so will trigger an
* exception at measurement time.</p>
*
* @param measuredWidth The measured width of this view. May be a complex
* bit mask as defined by {@link #MEASURED_SIZE_MASK} and
* {@link #MEASURED_STATE_TOO_SMALL}.
* @param measuredHeight The measured height of this view. May be a complex
* bit mask as defined by {@link #MEASURED_SIZE_MASK} and
* {@link #MEASURED_STATE_TOO_SMALL}.
*/
protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) {
boolean optical = isLayoutModeOptical(this);
if (optical != isLayoutModeOptical(mParent)) {
Insets insets = getOpticalInsets();
int opticalWidth = insets.left + insets.right;
int opticalHeight = insets.top + insets.bottom;
measuredWidth += optical ? opticalWidth : -opticalWidth;
measuredHeight += optical ? opticalHeight : -opticalHeight;
}
setMeasuredDimensionRaw(measuredWidth, measuredHeight);
}
/**
* Sets the measured dimension without extra processing for things like optical bounds.
* Useful for reapplying consistent values that have already been cooked with adjustments
* for optical bounds, etc. such as those from the measurement cache.
*
* @param measuredWidth The measured width of this view. May be a complex
* bit mask as defined by {@link #MEASURED_SIZE_MASK} and
* {@link #MEASURED_STATE_TOO_SMALL}.
* @param measuredHeight The measured height of this view. May be a complex
* bit mask as defined by {@link #MEASURED_SIZE_MASK} and
* {@link #MEASURED_STATE_TOO_SMALL}.
*/
private void setMeasuredDimensionRaw(int measuredWidth, int measuredHeight) {
mMeasuredWidth = measuredWidth;
mMeasuredHeight = measuredHeight;
mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET;
}
/**
* Merge two states as returned by {@link #getMeasuredState()}.
* @param curState The current state as returned from a view or the result
* of combining multiple views.
* @param newState The new view state to combine.
* @return Returns a new integer reflecting the combination of the two
* states.
*/
public static int combineMeasuredStates(int curState, int newState) {
return curState | newState;
}
/**
* Version of {@link #resolveSizeAndState(int, int, int)}
* returning only the {@link #MEASURED_SIZE_MASK} bits of the result.
*/
public static int resolveSize(int size, int measureSpec) {
return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK;
}
/**
* Utility to reconcile a desired size and state, with constraints imposed
* by a MeasureSpec. Will take the desired size, unless a different size
* is imposed by the constraints. The returned value is a compound integer,
* with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and
* optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the
* resulting size is smaller than the size the view wants to be.
*
* @param size How big the view wants to be.
* @param measureSpec Constraints imposed by the parent.
* @param childMeasuredState Size information bit mask for the view's
* children.
* @return Size information bit mask as defined by
* {@link #MEASURED_SIZE_MASK} and
* {@link #MEASURED_STATE_TOO_SMALL}.
*/
public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) {
final int specMode = MeasureSpec.getMode(measureSpec);
final int specSize = MeasureSpec.getSize(measureSpec);
final int result;
switch (specMode) {
case MeasureSpec.AT_MOST:
if (specSize < size) {
result = specSize | MEASURED_STATE_TOO_SMALL;
} else {
result = size;
}
break;
case MeasureSpec.EXACTLY:
result = specSize;
break;
case MeasureSpec.UNSPECIFIED:
default:
result = size;
}
return result | (childMeasuredState & MEASURED_STATE_MASK);
}
/**
* Utility to return a default size. Uses the supplied size if the
* MeasureSpec imposed no constraints. Will get larger if allowed
* by the MeasureSpec.
*
* @param size Default size for this view
* @param measureSpec Constraints imposed by the parent
* @return The size this view should be.
*/
public static int getDefaultSize(int size, int measureSpec) {
int result = size;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
switch (specMode) {
case MeasureSpec.UNSPECIFIED:
result = size;
break;
case MeasureSpec.AT_MOST:
case MeasureSpec.EXACTLY:
result = specSize;
break;
}
return result;
}
/**
* Returns the suggested minimum height that the view should use. This
* returns the maximum of the view's minimum height
* and the background's minimum height
* ({@link android.graphics.drawable.Drawable#getMinimumHeight()}).
* <p>
* When being used in {@link #onMeasure(int, int)}, the caller should still
* ensure the returned height is within the requirements of the parent.
*
* @return The suggested minimum height of the view.
*/
protected int getSuggestedMinimumHeight() {
return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight());
}
/**
* Returns the suggested minimum width that the view should use. This
* returns the maximum of the view's minimum width
* and the background's minimum width
* ({@link android.graphics.drawable.Drawable#getMinimumWidth()}).
* <p>
* When being used in {@link #onMeasure(int, int)}, the caller should still
* ensure the returned width is within the requirements of the parent.
*
* @return The suggested minimum width of the view.
*/
protected int getSuggestedMinimumWidth() {
return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth());
}
/**
* Returns the minimum height of the view.
*
* @return the minimum height the view will try to be.
*
* @see #setMinimumHeight(int)
*
* @attr ref android.R.styleable#View_minHeight
*/
public int getMinimumHeight() {
return mMinHeight;
}
/**
* Sets the minimum height of the view. It is not guaranteed the view will
* be able to achieve this minimum height (for example, if its parent layout
* constrains it with less available height).
*
* @param minHeight The minimum height the view will try to be.
*
* @see #getMinimumHeight()
*
* @attr ref android.R.styleable#View_minHeight
*/
@RemotableViewMethod
public void setMinimumHeight(int minHeight) {
mMinHeight = minHeight;
requestLayout();
}
/**
* Returns the minimum width of the view.
*
* @return the minimum width the view will try to be.
*
* @see #setMinimumWidth(int)
*
* @attr ref android.R.styleable#View_minWidth
*/
public int getMinimumWidth() {
return mMinWidth;
}
/**
* Sets the minimum width of the view. It is not guaranteed the view will
* be able to achieve this minimum width (for example, if its parent layout
* constrains it with less available width).
*
* @param minWidth The minimum width the view will try to be.
*
* @see #getMinimumWidth()
*
* @attr ref android.R.styleable#View_minWidth
*/
public void setMinimumWidth(int minWidth) {
mMinWidth = minWidth;
requestLayout();
}
/**
* Get the animation currently associated with this view.
*
* @return The animation that is currently playing or
* scheduled to play for this view.
*/
public Animation getAnimation() {
return mCurrentAnimation;
}
/**
* Start the specified animation now.
*
* @param animation the animation to start now
*/
public void startAnimation(Animation animation) {
animation.setStartTime(Animation.START_ON_FIRST_FRAME);
setAnimation(animation);
invalidateParentCaches();
invalidate(true);
}
/**
* Cancels any animations for this view.
*/
public void clearAnimation() {
if (mCurrentAnimation != null) {
mCurrentAnimation.detach();
}
mCurrentAnimation = null;
invalidateParentIfNeeded();
}
/**
* Sets the next animation to play for this view.
* If you want the animation to play immediately, use
* {@link #startAnimation(android.view.animation.Animation)} instead.
* This method provides allows fine-grained
* control over the start time and invalidation, but you
* must make sure that 1) the animation has a start time set, and
* 2) the view's parent (which controls animations on its children)
* will be invalidated when the animation is supposed to
* start.
*
* @param animation The next animation, or null.
*/
public void setAnimation(Animation animation) {
mCurrentAnimation = animation;
if (animation != null) {
// If the screen is off assume the animation start time is now instead of
// the next frame we draw. Keeping the START_ON_FIRST_FRAME start time
// would cause the animation to start when the screen turns back on
if (mAttachInfo != null && mAttachInfo.mDisplayState == Display.STATE_OFF
&& animation.getStartTime() == Animation.START_ON_FIRST_FRAME) {
animation.setStartTime(AnimationUtils.currentAnimationTimeMillis());
}
animation.reset();
}
}
/**
* Invoked by a parent ViewGroup to notify the start of the animation
* currently associated with this view. If you override this method,
* always call super.onAnimationStart();
*
* @see #setAnimation(android.view.animation.Animation)
* @see #getAnimation()
*/
@CallSuper
protected void onAnimationStart() {
mPrivateFlags |= PFLAG_ANIMATION_STARTED;
}
/**
* Invoked by a parent ViewGroup to notify the end of the animation
* currently associated with this view. If you override this method,
* always call super.onAnimationEnd();
*
* @see #setAnimation(android.view.animation.Animation)
* @see #getAnimation()
*/
@CallSuper
protected void onAnimationEnd() {
mPrivateFlags &= ~PFLAG_ANIMATION_STARTED;
}
/**
* Invoked if there is a Transform that involves alpha. Subclass that can
* draw themselves with the specified alpha should return true, and then
* respect that alpha when their onDraw() is called. If this returns false
* then the view may be redirected to draw into an offscreen buffer to
* fulfill the request, which will look fine, but may be slower than if the
* subclass handles it internally. The default implementation returns false.
*
* @param alpha The alpha (0..255) to apply to the view's drawing
* @return true if the view can draw with the specified alpha.
*/
protected boolean onSetAlpha(int alpha) {
return false;
}
/**
* This is used by the RootView to perform an optimization when
* the view hierarchy contains one or several SurfaceView.
* SurfaceView is always considered transparent, but its children are not,
* therefore all View objects remove themselves from the global transparent
* region (passed as a parameter to this function).
*
* @param region The transparent region for this ViewAncestor (window).
*
* @return Returns true if the effective visibility of the view at this
* point is opaque, regardless of the transparent region; returns false
* if it is possible for underlying windows to be seen behind the view.
*
* {@hide}
*/
public boolean gatherTransparentRegion(Region region) {
final AttachInfo attachInfo = mAttachInfo;
if (region != null && attachInfo != null) {
final int pflags = mPrivateFlags;
if ((pflags & PFLAG_SKIP_DRAW) == 0) {
// The SKIP_DRAW flag IS NOT set, so this view draws. We need to
// remove it from the transparent region.
final int[] location = attachInfo.mTransparentLocation;
getLocationInWindow(location);
// When a view has Z value, then it will be better to leave some area below the view
// for drawing shadow. The shadow outset is proportional to the Z value. Note that
// the bottom part needs more offset than the left, top and right parts due to the
// spot light effects.
int shadowOffset = getZ() > 0 ? (int) getZ() : 0;
region.op(location[0] - shadowOffset, location[1] - shadowOffset,
location[0] + mRight - mLeft + shadowOffset,
location[1] + mBottom - mTop + (shadowOffset * 3), Region.Op.DIFFERENCE);
} else {
if (mBackground != null && mBackground.getOpacity() != PixelFormat.TRANSPARENT) {
// The SKIP_DRAW flag IS set and the background drawable exists, we remove
// the background drawable's non-transparent parts from this transparent region.
applyDrawableToTransparentRegion(mBackground, region);
}
if (mForegroundInfo != null && mForegroundInfo.mDrawable != null
&& mForegroundInfo.mDrawable.getOpacity() != PixelFormat.TRANSPARENT) {
// Similarly, we remove the foreground drawable's non-transparent parts.
applyDrawableToTransparentRegion(mForegroundInfo.mDrawable, region);
}
}
}
return true;
}
/**
* Play a sound effect for this view.
*
* <p>The framework will play sound effects for some built in actions, such as
* clicking, but you may wish to play these effects in your widget,
* for instance, for internal navigation.
*
* <p>The sound effect will only be played if sound effects are enabled by the user, and
* {@link #isSoundEffectsEnabled()} is true.
*
* @param soundConstant One of the constants defined in {@link SoundEffectConstants}
*/
public void playSoundEffect(int soundConstant) {
if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) {
return;
}
mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant);
}
/**
* BZZZTT!!1!
*
* <p>Provide haptic feedback to the user for this view.
*
* <p>The framework will provide haptic feedback for some built in actions,
* such as long presses, but you may wish to provide feedback for your
* own widget.
*
* <p>The feedback will only be performed if
* {@link #isHapticFeedbackEnabled()} is true.
*
* @param feedbackConstant One of the constants defined in
* {@link HapticFeedbackConstants}
*/
public boolean performHapticFeedback(int feedbackConstant) {
return performHapticFeedback(feedbackConstant, 0);
}
/**
* BZZZTT!!1!
*
* <p>Like {@link #performHapticFeedback(int)}, with additional options.
*
* @param feedbackConstant One of the constants defined in
* {@link HapticFeedbackConstants}
* @param flags Additional flags as per {@link HapticFeedbackConstants}.
*/
public boolean performHapticFeedback(int feedbackConstant, int flags) {
if (mAttachInfo == null) {
return false;
}
//noinspection SimplifiableIfStatement
if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0
&& !isHapticFeedbackEnabled()) {
return false;
}
return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant,
(flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0);
}
/**
* Request that the visibility of the status bar or other screen/window
* decorations be changed.
*
* <p>This method is used to put the over device UI into temporary modes
* where the user's attention is focused more on the application content,
* by dimming or hiding surrounding system affordances. This is typically
* used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY
* Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content
* to be placed behind the action bar (and with these flags other system
* affordances) so that smooth transitions between hiding and showing them
* can be done.
*
* <p>Two representative examples of the use of system UI visibility is
* implementing a content browsing application (like a magazine reader)
* and a video playing application.
*
* <p>The first code shows a typical implementation of a View in a content
* browsing application. In this implementation, the application goes
* into a content-oriented mode by hiding the status bar and action bar,
* and putting the navigation elements into lights out mode. The user can
* then interact with content while in this mode. Such an application should
* provide an easy way for the user to toggle out of the mode (such as to
* check information in the status bar or access notifications). In the
* implementation here, this is done simply by tapping on the content.
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java
* content}
*
* <p>This second code sample shows a typical implementation of a View
* in a video playing application. In this situation, while the video is
* playing the application would like to go into a complete full-screen mode,
* to use as much of the display as possible for the video. When in this state
* the user can not interact with the application; the system intercepts
* touching on the screen to pop the UI out of full screen mode. See
* {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code.
*
* {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java
* content}
*
* @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
* {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN},
* {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION},
* {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE},
* and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}.
*/
public void setSystemUiVisibility(int visibility) {
if (visibility != mSystemUiVisibility) {
mSystemUiVisibility = visibility;
if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
mParent.recomputeViewAttributes(this);
}
}
}
/**
* Returns the last {@link #setSystemUiVisibility(int)} that this view has requested.
* @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
* {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN},
* {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION},
* {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}, {@link #SYSTEM_UI_FLAG_IMMERSIVE},
* and {@link #SYSTEM_UI_FLAG_IMMERSIVE_STICKY}.
*/
public int getSystemUiVisibility() {
return mSystemUiVisibility;
}
/**
* Returns the current system UI visibility that is currently set for
* the entire window. This is the combination of the
* {@link #setSystemUiVisibility(int)} values supplied by all of the
* views in the window.
*/
public int getWindowSystemUiVisibility() {
return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0;
}
/**
* Override to find out when the window's requested system UI visibility
* has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}.
* This is different from the callbacks received through
* {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)}
* in that this is only telling you about the local request of the window,
* not the actual values applied by the system.
*/
public void onWindowSystemUiVisibilityChanged(int visible) {
}
/**
* Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down
* the view hierarchy.
*/
public void dispatchWindowSystemUiVisiblityChanged(int visible) {
onWindowSystemUiVisibilityChanged(visible);
}
/**
* Set a listener to receive callbacks when the visibility of the system bar changes.
* @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks.
*/
public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) {
getListenerInfo().mOnSystemUiVisibilityChangeListener = l;
if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
mParent.recomputeViewAttributes(this);
}
}
/**
* Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down
* the view hierarchy.
*/
public void dispatchSystemUiVisibilityChanged(int visibility) {
ListenerInfo li = mListenerInfo;
if (li != null && li.mOnSystemUiVisibilityChangeListener != null) {
li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange(
visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK);
}
}
boolean updateLocalSystemUiVisibility(int localValue, int localChanges) {
int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges);
if (val != mSystemUiVisibility) {
setSystemUiVisibility(val);
return true;
}
return false;
}
/** @hide */
public void setDisabledSystemUiVisibility(int flags) {
if (mAttachInfo != null) {
if (mAttachInfo.mDisabledSystemUiVisibility != flags) {
mAttachInfo.mDisabledSystemUiVisibility = flags;
if (mParent != null) {
mParent.recomputeViewAttributes(this);
}
}
}
}
/**
* Creates an image that the system displays during the drag and drop
* operation. This is called a "drag shadow". The default implementation
* for a DragShadowBuilder based on a View returns an image that has exactly the same
* appearance as the given View. The default also positions the center of the drag shadow
* directly under the touch point. If no View is provided (the constructor with no parameters
* is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and
* {@link #onDrawShadow(Canvas) onDrawShadow()} are not overridden, then the
* default is an invisible drag shadow.
* <p>
* You are not required to use the View you provide to the constructor as the basis of the
* drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw
* anything you want as the drag shadow.
* </p>
* <p>
* You pass a DragShadowBuilder object to the system when you start the drag. The system
* calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the
* size and position of the drag shadow. It uses this data to construct a
* {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()}
* so that your application can draw the shadow image in the Canvas.
* </p>
*
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For a guide to implementing drag and drop features, read the
* <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p>
* </div>
*/
public static class DragShadowBuilder {
private final WeakReference<View> mView;
/**
* Constructs a shadow image builder based on a View. By default, the resulting drag
* shadow will have the same appearance and dimensions as the View, with the touch point
* over the center of the View.
* @param view A View. Any View in scope can be used.
*/
public DragShadowBuilder(View view) {
mView = new WeakReference<View>(view);
}
/**
* Construct a shadow builder object with no associated View. This
* constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)}
* and {@link #onDrawShadow(Canvas)} methods are also overridden in order
* to supply the drag shadow's dimensions and appearance without
* reference to any View object. If they are not overridden, then the result is an
* invisible drag shadow.
*/
public DragShadowBuilder() {
mView = new WeakReference<View>(null);
}
/**
* Returns the View object that had been passed to the
* {@link #View.DragShadowBuilder(View)}
* constructor. If that View parameter was {@code null} or if the
* {@link #View.DragShadowBuilder()}
* constructor was used to instantiate the builder object, this method will return
* null.
*
* @return The View object associate with this builder object.
*/
@SuppressWarnings({"JavadocReference"})
final public View getView() {
return mView.get();
}
/**
* Provides the metrics for the shadow image. These include the dimensions of
* the shadow image, and the point within that shadow that should
* be centered under the touch location while dragging.
* <p>
* The default implementation sets the dimensions of the shadow to be the
* same as the dimensions of the View itself and centers the shadow under
* the touch point.
* </p>
*
* @param outShadowSize A {@link android.graphics.Point} containing the width and height
* of the shadow image. Your application must set {@link android.graphics.Point#x} to the
* desired width and must set {@link android.graphics.Point#y} to the desired height of the
* image.
*
* @param outShadowTouchPoint A {@link android.graphics.Point} for the position within the
* shadow image that should be underneath the touch point during the drag and drop
* operation. Your application must set {@link android.graphics.Point#x} to the
* X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position.
*/
public void onProvideShadowMetrics(Point outShadowSize, Point outShadowTouchPoint) {
final View view = mView.get();
if (view != null) {
outShadowSize.set(view.getWidth(), view.getHeight());
outShadowTouchPoint.set(outShadowSize.x / 2, outShadowSize.y / 2);
} else {
Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view");
}
}
/**
* Draws the shadow image. The system creates the {@link android.graphics.Canvas} object
* based on the dimensions it received from the
* {@link #onProvideShadowMetrics(Point, Point)} callback.
*
* @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image.
*/
public void onDrawShadow(Canvas canvas) {
final View view = mView.get();
if (view != null) {
view.draw(canvas);
} else {
Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view");
}
}
}
/**
* @deprecated Use {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object, int)
* startDragAndDrop()} for newer platform versions.
*/
public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder,
Object myLocalState, int flags) {
return startDragAndDrop(data, shadowBuilder, myLocalState, flags);
}
/**
* Starts a drag and drop operation. When your application calls this method, it passes a
* {@link android.view.View.DragShadowBuilder} object to the system. The
* system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)}
* to get metrics for the drag shadow, and then calls the object's
* {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself.
* <p>
* Once the system has the drag shadow, it begins the drag and drop operation by sending
* drag events to all the View objects in your application that are currently visible. It does
* this either by calling the View object's drag listener (an implementation of
* {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the
* View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method.
* Both are passed a {@link android.view.DragEvent} object that has a
* {@link android.view.DragEvent#getAction()} value of
* {@link android.view.DragEvent#ACTION_DRAG_STARTED}.
* </p>
* <p>
* Your application can invoke {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object,
* int) startDragAndDrop()} on any attached View object. The View object does not need to be
* the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to be related
* to the View the user selected for dragging.
* </p>
* @param data A {@link android.content.ClipData} object pointing to the data to be
* transferred by the drag and drop operation.
* @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the
* drag shadow.
* @param myLocalState An {@link java.lang.Object} containing local data about the drag and
* drop operation. When dispatching drag events to views in the same activity this object
* will be available through {@link android.view.DragEvent#getLocalState()}. Views in other
* activities will not have access to this data ({@link android.view.DragEvent#getLocalState()}
* will return null).
* <p>
* myLocalState is a lightweight mechanism for the sending information from the dragged View
* to the target Views. For example, it can contain flags that differentiate between a
* a copy operation and a move operation.
* </p>
* @param flags Flags that control the drag and drop operation. This can be set to 0 for no
* flags, or any combination of the following:
* <ul>
* <li>{@link #DRAG_FLAG_GLOBAL}</li>
* <li>{@link #DRAG_FLAG_GLOBAL_PERSISTABLE_URI_PERMISSION}</li>
* <li>{@link #DRAG_FLAG_GLOBAL_PREFIX_URI_PERMISSION}</li>
* <li>{@link #DRAG_FLAG_GLOBAL_URI_READ}</li>
* <li>{@link #DRAG_FLAG_GLOBAL_URI_WRITE}</li>
* <li>{@link #DRAG_FLAG_OPAQUE}</li>
* </ul>
* @return {@code true} if the method completes successfully, or
* {@code false} if it fails anywhere. Returning {@code false} means the system was unable to
* do a drag, and so no drag operation is in progress.
*/
public final boolean startDragAndDrop(ClipData data, DragShadowBuilder shadowBuilder,
Object myLocalState, int flags) {
if (ViewDebug.DEBUG_DRAG) {
Log.d(VIEW_LOG_TAG, "startDragAndDrop: data=" + data + " flags=" + flags);
}
if (mAttachInfo == null) {
Log.w(VIEW_LOG_TAG, "startDragAndDrop called on a detached view.");
return false;
}
boolean okay = false;
Point shadowSize = new Point();
Point shadowTouchPoint = new Point();
shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint);
if ((shadowSize.x < 0) || (shadowSize.y < 0) ||
(shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) {
throw new IllegalStateException("Drag shadow dimensions must not be negative");
}
if (ViewDebug.DEBUG_DRAG) {
Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y
+ " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y);
}
if (mAttachInfo.mDragSurface != null) {
mAttachInfo.mDragSurface.release();
}
mAttachInfo.mDragSurface = new Surface();
try {
mAttachInfo.mDragToken = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow,
flags, shadowSize.x, shadowSize.y, mAttachInfo.mDragSurface);
if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token="
+ mAttachInfo.mDragToken + " surface=" + mAttachInfo.mDragSurface);
if (mAttachInfo.mDragToken != null) {
Canvas canvas = mAttachInfo.mDragSurface.lockCanvas(null);
try {
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
shadowBuilder.onDrawShadow(canvas);
} finally {
mAttachInfo.mDragSurface.unlockCanvasAndPost(canvas);
}
final ViewRootImpl root = getViewRootImpl();
// Cache the local state object for delivery with DragEvents
root.setLocalDragState(myLocalState);
// repurpose 'shadowSize' for the last touch point
root.getLastTouchPoint(shadowSize);
okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, mAttachInfo.mDragToken,
root.getLastTouchSource(), shadowSize.x, shadowSize.y,
shadowTouchPoint.x, shadowTouchPoint.y, data);
if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay);
}
} catch (Exception e) {
Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e);
mAttachInfo.mDragSurface.destroy();
mAttachInfo.mDragSurface = null;
}
return okay;
}
/**
* Cancels an ongoing drag and drop operation.
* <p>
* A {@link android.view.DragEvent} object with
* {@link android.view.DragEvent#getAction()} value of
* {@link android.view.DragEvent#ACTION_DRAG_ENDED} and
* {@link android.view.DragEvent#getResult()} value of {@code false}
* will be sent to every
* View that received {@link android.view.DragEvent#ACTION_DRAG_STARTED}
* even if they are not currently visible.
* </p>
* <p>
* This method can be called on any View in the same window as the View on which
* {@link #startDragAndDrop(ClipData, DragShadowBuilder, Object, int) startDragAndDrop}
* was called.
* </p>
*/
public final void cancelDragAndDrop() {
if (ViewDebug.DEBUG_DRAG) {
Log.d(VIEW_LOG_TAG, "cancelDragAndDrop");
}
if (mAttachInfo == null) {
Log.w(VIEW_LOG_TAG, "cancelDragAndDrop called on a detached view.");
return;
}
if (mAttachInfo.mDragToken != null) {
try {
mAttachInfo.mSession.cancelDragAndDrop(mAttachInfo.mDragToken);
} catch (Exception e) {
Log.e(VIEW_LOG_TAG, "Unable to cancel drag", e);
}
mAttachInfo.mDragToken = null;
} else {
Log.e(VIEW_LOG_TAG, "No active drag to cancel");
}
}
/**
* Updates the drag shadow for the ongoing drag and drop operation.
*
* @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the
* new drag shadow.
*/
public final void updateDragShadow(DragShadowBuilder shadowBuilder) {
if (ViewDebug.DEBUG_DRAG) {
Log.d(VIEW_LOG_TAG, "updateDragShadow");
}
if (mAttachInfo == null) {
Log.w(VIEW_LOG_TAG, "updateDragShadow called on a detached view.");
return;
}
if (mAttachInfo.mDragToken != null) {
try {
Canvas canvas = mAttachInfo.mDragSurface.lockCanvas(null);
try {
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
shadowBuilder.onDrawShadow(canvas);
} finally {
mAttachInfo.mDragSurface.unlockCanvasAndPost(canvas);
}
} catch (Exception e) {
Log.e(VIEW_LOG_TAG, "Unable to update drag shadow", e);
}
} else {
Log.e(VIEW_LOG_TAG, "No active drag");
}
}
/**
* Starts a move from {startX, startY}, the amount of the movement will be the offset
* between {startX, startY} and the new cursor positon.
* @param startX horizontal coordinate where the move started.
* @param startY vertical coordinate where the move started.
* @return whether moving was started successfully.
* @hide
*/
public final boolean startMovingTask(float startX, float startY) {
if (ViewDebug.DEBUG_POSITIONING) {
Log.d(VIEW_LOG_TAG, "startMovingTask: {" + startX + "," + startY + "}");
}
try {
return mAttachInfo.mSession.startMovingTask(mAttachInfo.mWindow, startX, startY);
} catch (RemoteException e) {
Log.e(VIEW_LOG_TAG, "Unable to start moving", e);
}
return false;
}
/**
* Handles drag events sent by the system following a call to
* {@link android.view.View#startDragAndDrop(ClipData,DragShadowBuilder,Object,int)
* startDragAndDrop()}.
*<p>
* When the system calls this method, it passes a
* {@link android.view.DragEvent} object. A call to
* {@link android.view.DragEvent#getAction()} returns one of the action type constants defined
* in DragEvent. The method uses these to determine what is happening in the drag and drop
* operation.
* @param event The {@link android.view.DragEvent} sent by the system.
* The {@link android.view.DragEvent#getAction()} method returns an action type constant defined
* in DragEvent, indicating the type of drag event represented by this object.
* @return {@code true} if the method was successful, otherwise {@code false}.
* <p>
* The method should return {@code true} in response to an action type of
* {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current
* operation.
* </p>
* <p>
* The method should also return {@code true} in response to an action type of
* {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or
* {@code false} if it didn't.
* </p>
*/
public boolean onDragEvent(DragEvent event) {
return false;
}
// Dispatches ACTION_DRAG_ENTERED and ACTION_DRAG_EXITED events for pre-Nougat apps.
boolean dispatchDragEnterExitInPreN(DragEvent event) {
return callDragEventHandler(event);
}
/**
* Detects if this View is enabled and has a drag event listener.
* If both are true, then it calls the drag event listener with the
* {@link android.view.DragEvent} it received. If the drag event listener returns
* {@code true}, then dispatchDragEvent() returns {@code true}.
* <p>
* For all other cases, the method calls the
* {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler
* method and returns its result.
* </p>
* <p>
* This ensures that a drag event is always consumed, even if the View does not have a drag
* event listener. However, if the View has a listener and the listener returns true, then
* onDragEvent() is not called.
* </p>
*/
public boolean dispatchDragEvent(DragEvent event) {
event.mEventHandlerWasCalled = true;
if (event.mAction == DragEvent.ACTION_DRAG_LOCATION ||
event.mAction == DragEvent.ACTION_DROP) {
// About to deliver an event with coordinates to this view. Notify that now this view
// has drag focus. This will send exit/enter events as needed.
getViewRootImpl().setDragFocus(this, event);
}
return callDragEventHandler(event);
}
final boolean callDragEventHandler(DragEvent event) {
final boolean result;
ListenerInfo li = mListenerInfo;
//noinspection SimplifiableIfStatement
if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
&& li.mOnDragListener.onDrag(this, event)) {
result = true;
} else {
result = onDragEvent(event);
}
switch (event.mAction) {
case DragEvent.ACTION_DRAG_ENTERED: {
mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED;
refreshDrawableState();
} break;
case DragEvent.ACTION_DRAG_EXITED: {
mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED;
refreshDrawableState();
} break;
case DragEvent.ACTION_DRAG_ENDED: {
mPrivateFlags2 &= ~View.DRAG_MASK;
refreshDrawableState();
} break;
}
return result;
}
boolean canAcceptDrag() {
return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0;
}
/**
* This needs to be a better API (NOT ON VIEW) before it is exposed. If
* it is ever exposed at all.
* @hide
*/
public void onCloseSystemDialogs(String reason) {
}
/**
* Given a Drawable whose bounds have been set to draw into this view,
* update a Region being computed for
* {@link #gatherTransparentRegion(android.graphics.Region)} so
* that any non-transparent parts of the Drawable are removed from the
* given transparent region.
*
* @param dr The Drawable whose transparency is to be applied to the region.
* @param region A Region holding the current transparency information,
* where any parts of the region that are set are considered to be
* transparent. On return, this region will be modified to have the
* transparency information reduced by the corresponding parts of the
* Drawable that are not transparent.
* {@hide}
*/
public void applyDrawableToTransparentRegion(Drawable dr, Region region) {
if (DBG) {
Log.i("View", "Getting transparent region for: " + this);
}
final Region r = dr.getTransparentRegion();
final Rect db = dr.getBounds();
final AttachInfo attachInfo = mAttachInfo;
if (r != null && attachInfo != null) {
final int w = getRight()-getLeft();
final int h = getBottom()-getTop();
if (db.left > 0) {
//Log.i("VIEW", "Drawable left " + db.left + " > view 0");
r.op(0, 0, db.left, h, Region.Op.UNION);
}
if (db.right < w) {
//Log.i("VIEW", "Drawable right " + db.right + " < view " + w);
r.op(db.right, 0, w, h, Region.Op.UNION);
}
if (db.top > 0) {
//Log.i("VIEW", "Drawable top " + db.top + " > view 0");
r.op(0, 0, w, db.top, Region.Op.UNION);
}
if (db.bottom < h) {
//Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h);
r.op(0, db.bottom, w, h, Region.Op.UNION);
}
final int[] location = attachInfo.mTransparentLocation;
getLocationInWindow(location);
r.translate(location[0], location[1]);
region.op(r, Region.Op.INTERSECT);
} else {
region.op(db, Region.Op.DIFFERENCE);
}
}
private void checkForLongClick(int delayOffset, float x, float y) {
if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) {
mHasPerformedLongPress = false;
if (mPendingCheckForLongPress == null) {
mPendingCheckForLongPress = new CheckForLongPress();
}
mPendingCheckForLongPress.setAnchor(x, y);
mPendingCheckForLongPress.rememberWindowAttachCount();
postDelayed(mPendingCheckForLongPress,
ViewConfiguration.getLongPressTimeout() - delayOffset);
}
}
/**
* Inflate a view from an XML resource. This convenience method wraps the {@link
* LayoutInflater} class, which provides a full range of options for view inflation.
*
* @param context The Context object for your activity or application.
* @param resource The resource ID to inflate
* @param root A view group that will be the parent. Used to properly inflate the
* layout_* parameters.
* @see LayoutInflater
*/
public static View inflate(Context context, @LayoutRes int resource, ViewGroup root) {
LayoutInflater factory = LayoutInflater.from(context);
return factory.inflate(resource, root);
}
/**
* Scroll the view with standard behavior for scrolling beyond the normal
* content boundaries. Views that call this method should override
* {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the
* results of an over-scroll operation.
*
* Views can use this method to handle any touch or fling-based scrolling.
*
* @param deltaX Change in X in pixels
* @param deltaY Change in Y in pixels
* @param scrollX Current X scroll value in pixels before applying deltaX
* @param scrollY Current Y scroll value in pixels before applying deltaY
* @param scrollRangeX Maximum content scroll range along the X axis
* @param scrollRangeY Maximum content scroll range along the Y axis
* @param maxOverScrollX Number of pixels to overscroll by in either direction
* along the X axis.
* @param maxOverScrollY Number of pixels to overscroll by in either direction
* along the Y axis.
* @param isTouchEvent true if this scroll operation is the result of a touch event.
* @return true if scrolling was clamped to an over-scroll boundary along either
* axis, false otherwise.
*/
@SuppressWarnings({"UnusedParameters"})
protected boolean overScrollBy(int deltaX, int deltaY,
int scrollX, int scrollY,
int scrollRangeX, int scrollRangeY,
int maxOverScrollX, int maxOverScrollY,
boolean isTouchEvent) {
final int overScrollMode = mOverScrollMode;
final boolean canScrollHorizontal =
computeHorizontalScrollRange() > computeHorizontalScrollExtent();
final boolean canScrollVertical =
computeVerticalScrollRange() > computeVerticalScrollExtent();
final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS ||
(overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal);
final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS ||
(overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical);
int newScrollX = scrollX + deltaX;
if (!overScrollHorizontal) {
maxOverScrollX = 0;
}
int newScrollY = scrollY + deltaY;
if (!overScrollVertical) {
maxOverScrollY = 0;
}
// Clamp values if at the limits and record
final int left = -maxOverScrollX;
final int right = maxOverScrollX + scrollRangeX;
final int top = -maxOverScrollY;
final int bottom = maxOverScrollY + scrollRangeY;
boolean clampedX = false;
if (newScrollX > right) {
newScrollX = right;
clampedX = true;
} else if (newScrollX < left) {
newScrollX = left;
clampedX = true;
}
boolean clampedY = false;
if (newScrollY > bottom) {
newScrollY = bottom;
clampedY = true;
} else if (newScrollY < top) {
newScrollY = top;
clampedY = true;
}
onOverScrolled(newScrollX, newScrollY, clampedX, clampedY);
return clampedX || clampedY;
}
/**
* Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to
* respond to the results of an over-scroll operation.
*
* @param scrollX New X scroll value in pixels
* @param scrollY New Y scroll value in pixels
* @param clampedX True if scrollX was clamped to an over-scroll boundary
* @param clampedY True if scrollY was clamped to an over-scroll boundary
*/
protected void onOverScrolled(int scrollX, int scrollY,
boolean clampedX, boolean clampedY) {
// Intentionally empty.
}
/**
* Returns the over-scroll mode for this view. The result will be
* one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}
* (allow over-scrolling only if the view content is larger than the container),
* or {@link #OVER_SCROLL_NEVER}.
*
* @return This view's over-scroll mode.
*/
public int getOverScrollMode() {
return mOverScrollMode;
}
/**
* Set the over-scroll mode for this view. Valid over-scroll modes are
* {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}
* (allow over-scrolling only if the view content is larger than the container),
* or {@link #OVER_SCROLL_NEVER}.
*
* Setting the over-scroll mode of a view will have an effect only if the
* view is capable of scrolling.
*
* @param overScrollMode The new over-scroll mode for this view.
*/
public void setOverScrollMode(int overScrollMode) {
if (overScrollMode != OVER_SCROLL_ALWAYS &&
overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS &&
overScrollMode != OVER_SCROLL_NEVER) {
throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode);
}
mOverScrollMode = overScrollMode;
}
/**
* Enable or disable nested scrolling for this view.
*
* <p>If this property is set to true the view will be permitted to initiate nested
* scrolling operations with a compatible parent view in the current hierarchy. If this
* view does not implement nested scrolling this will have no effect. Disabling nested scrolling
* while a nested scroll is in progress has the effect of {@link #stopNestedScroll() stopping}
* the nested scroll.</p>
*
* @param enabled true to enable nested scrolling, false to disable
*
* @see #isNestedScrollingEnabled()
*/
public void setNestedScrollingEnabled(boolean enabled) {
if (enabled) {
mPrivateFlags3 |= PFLAG3_NESTED_SCROLLING_ENABLED;
} else {
stopNestedScroll();
mPrivateFlags3 &= ~PFLAG3_NESTED_SCROLLING_ENABLED;
}
}
/**
* Returns true if nested scrolling is enabled for this view.
*
* <p>If nested scrolling is enabled and this View class implementation supports it,
* this view will act as a nested scrolling child view when applicable, forwarding data
* about the scroll operation in progress to a compatible and cooperating nested scrolling
* parent.</p>
*
* @return true if nested scrolling is enabled
*
* @see #setNestedScrollingEnabled(boolean)
*/
public boolean isNestedScrollingEnabled() {
return (mPrivateFlags3 & PFLAG3_NESTED_SCROLLING_ENABLED) ==
PFLAG3_NESTED_SCROLLING_ENABLED;
}
/**
* Begin a nestable scroll operation along the given axes.
*
* <p>A view starting a nested scroll promises to abide by the following contract:</p>
*
* <p>The view will call startNestedScroll upon initiating a scroll operation. In the case
* of a touch scroll this corresponds to the initial {@link MotionEvent#ACTION_DOWN}.
* In the case of touch scrolling the nested scroll will be terminated automatically in
* the same manner as {@link ViewParent#requestDisallowInterceptTouchEvent(boolean)}.
* In the event of programmatic scrolling the caller must explicitly call
* {@link #stopNestedScroll()} to indicate the end of the nested scroll.</p>
*
* <p>If <code>startNestedScroll</code> returns true, a cooperative parent was found.
* If it returns false the caller may ignore the rest of this contract until the next scroll.
* Calling startNestedScroll while a nested scroll is already in progress will return true.</p>
*
* <p>At each incremental step of the scroll the caller should invoke
* {@link #dispatchNestedPreScroll(int, int, int[], int[]) dispatchNestedPreScroll}
* once it has calculated the requested scrolling delta. If it returns true the nested scrolling
* parent at least partially consumed the scroll and the caller should adjust the amount it
* scrolls by.</p>
*
* <p>After applying the remainder of the scroll delta the caller should invoke
* {@link #dispatchNestedScroll(int, int, int, int, int[]) dispatchNestedScroll}, passing
* both the delta consumed and the delta unconsumed. A nested scrolling parent may treat
* these values differently. See {@link ViewParent#onNestedScroll(View, int, int, int, int)}.
* </p>
*
* @param axes Flags consisting of a combination of {@link #SCROLL_AXIS_HORIZONTAL} and/or
* {@link #SCROLL_AXIS_VERTICAL}.
* @return true if a cooperative parent was found and nested scrolling has been enabled for
* the current gesture.
*
* @see #stopNestedScroll()
* @see #dispatchNestedPreScroll(int, int, int[], int[])
* @see #dispatchNestedScroll(int, int, int, int, int[])
*/
public boolean startNestedScroll(int axes) {
if (hasNestedScrollingParent()) {
// Already in progress
return true;
}
if (isNestedScrollingEnabled()) {
ViewParent p = getParent();
View child = this;
while (p != null) {
try {
if (p.onStartNestedScroll(child, this, axes)) {
mNestedScrollingParent = p;
p.onNestedScrollAccepted(child, this, axes);
return true;
}
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, "ViewParent " + p + " does not implement interface " +
"method onStartNestedScroll", e);
// Allow the search upward to continue
}
if (p instanceof View) {
child = (View) p;
}
p = p.getParent();
}
}
return false;
}
/**
* Stop a nested scroll in progress.
*
* <p>Calling this method when a nested scroll is not currently in progress is harmless.</p>
*
* @see #startNestedScroll(int)
*/
public void stopNestedScroll() {
if (mNestedScrollingParent != null) {
mNestedScrollingParent.onStopNestedScroll(this);
mNestedScrollingParent = null;
}
}
/**
* Returns true if this view has a nested scrolling parent.
*
* <p>The presence of a nested scrolling parent indicates that this view has initiated
* a nested scroll and it was accepted by an ancestor view further up the view hierarchy.</p>
*
* @return whether this view has a nested scrolling parent
*/
public boolean hasNestedScrollingParent() {
return mNestedScrollingParent != null;
}
/**
* Dispatch one step of a nested scroll in progress.
*
* <p>Implementations of views that support nested scrolling should call this to report
* info about a scroll in progress to the current nested scrolling parent. If a nested scroll
* is not currently in progress or nested scrolling is not
* {@link #isNestedScrollingEnabled() enabled} for this view this method does nothing.</p>
*
* <p>Compatible View implementations should also call
* {@link #dispatchNestedPreScroll(int, int, int[], int[]) dispatchNestedPreScroll} before
* consuming a component of the scroll event themselves.</p>
*
* @param dxConsumed Horizontal distance in pixels consumed by this view during this scroll step
* @param dyConsumed Vertical distance in pixels consumed by this view during this scroll step
* @param dxUnconsumed Horizontal scroll distance in pixels not consumed by this view
* @param dyUnconsumed Horizontal scroll distance in pixels not consumed by this view
* @param offsetInWindow Optional. If not null, on return this will contain the offset
* in local view coordinates of this view from before this operation
* to after it completes. View implementations may use this to adjust
* expected input coordinate tracking.
* @return true if the event was dispatched, false if it could not be dispatched.
* @see #dispatchNestedPreScroll(int, int, int[], int[])
*/
public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed,
int dxUnconsumed, int dyUnconsumed, @Nullable @Size(2) int[] offsetInWindow) {
if (isNestedScrollingEnabled() && mNestedScrollingParent != null) {
if (dxConsumed != 0 || dyConsumed != 0 || dxUnconsumed != 0 || dyUnconsumed != 0) {
int startX = 0;
int startY = 0;
if (offsetInWindow != null) {
getLocationInWindow(offsetInWindow);
startX = offsetInWindow[0];
startY = offsetInWindow[1];
}
mNestedScrollingParent.onNestedScroll(this, dxConsumed, dyConsumed,
dxUnconsumed, dyUnconsumed);
if (offsetInWindow != null) {
getLocationInWindow(offsetInWindow);
offsetInWindow[0] -= startX;
offsetInWindow[1] -= startY;
}
return true;
} else if (offsetInWindow != null) {
// No motion, no dispatch. Keep offsetInWindow up to date.
offsetInWindow[0] = 0;
offsetInWindow[1] = 0;
}
}
return false;
}
/**
* Dispatch one step of a nested scroll in progress before this view consumes any portion of it.
*
* <p>Nested pre-scroll events are to nested scroll events what touch intercept is to touch.
* <code>dispatchNestedPreScroll</code> offers an opportunity for the parent view in a nested
* scrolling operation to consume some or all of the scroll operation before the child view
* consumes it.</p>
*
* @param dx Horizontal scroll distance in pixels
* @param dy Vertical scroll distance in pixels
* @param consumed Output. If not null, consumed[0] will contain the consumed component of dx
* and consumed[1] the consumed dy.
* @param offsetInWindow Optional. If not null, on return this will contain the offset
* in local view coordinates of this view from before this operation
* to after it completes. View implementations may use this to adjust
* expected input coordinate tracking.
* @return true if the parent consumed some or all of the scroll delta
* @see #dispatchNestedScroll(int, int, int, int, int[])
*/
public boolean dispatchNestedPreScroll(int dx, int dy,
@Nullable @Size(2) int[] consumed, @Nullable @Size(2) int[] offsetInWindow) {
if (isNestedScrollingEnabled() && mNestedScrollingParent != null) {
if (dx != 0 || dy != 0) {
int startX = 0;
int startY = 0;
if (offsetInWindow != null) {
getLocationInWindow(offsetInWindow);
startX = offsetInWindow[0];
startY = offsetInWindow[1];
}
if (consumed == null) {
if (mTempNestedScrollConsumed == null) {
mTempNestedScrollConsumed = new int[2];
}
consumed = mTempNestedScrollConsumed;
}
consumed[0] = 0;
consumed[1] = 0;
mNestedScrollingParent.onNestedPreScroll(this, dx, dy, consumed);
if (offsetInWindow != null) {
getLocationInWindow(offsetInWindow);
offsetInWindow[0] -= startX;
offsetInWindow[1] -= startY;
}
return consumed[0] != 0 || consumed[1] != 0;
} else if (offsetInWindow != null) {
offsetInWindow[0] = 0;
offsetInWindow[1] = 0;
}
}
return false;
}
/**
* Dispatch a fling to a nested scrolling parent.
*
* <p>This method should be used to indicate that a nested scrolling child has detected
* suitable conditions for a fling. Generally this means that a touch scroll has ended with a
* {@link VelocityTracker velocity} in the direction of scrolling that meets or exceeds
* the {@link ViewConfiguration#getScaledMinimumFlingVelocity() minimum fling velocity}
* along a scrollable axis.</p>
*
* <p>If a nested scrolling child view would normally fling but it is at the edge of
* its own content, it can use this method to delegate the fling to its nested scrolling
* parent instead. The parent may optionally consume the fling or observe a child fling.</p>
*
* @param velocityX Horizontal fling velocity in pixels per second
* @param velocityY Vertical fling velocity in pixels per second
* @param consumed true if the child consumed the fling, false otherwise
* @return true if the nested scrolling parent consumed or otherwise reacted to the fling
*/
public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
if (isNestedScrollingEnabled() && mNestedScrollingParent != null) {
return mNestedScrollingParent.onNestedFling(this, velocityX, velocityY, consumed);
}
return false;
}
/**
* Dispatch a fling to a nested scrolling parent before it is processed by this view.
*
* <p>Nested pre-fling events are to nested fling events what touch intercept is to touch
* and what nested pre-scroll is to nested scroll. <code>dispatchNestedPreFling</code>
* offsets an opportunity for the parent view in a nested fling to fully consume the fling
* before the child view consumes it. If this method returns <code>true</code>, a nested
* parent view consumed the fling and this view should not scroll as a result.</p>
*
* <p>For a better user experience, only one view in a nested scrolling chain should consume
* the fling at a time. If a parent view consumed the fling this method will return false.
* Custom view implementations should account for this in two ways:</p>
*
* <ul>
* <li>If a custom view is paged and needs to settle to a fixed page-point, do not
* call <code>dispatchNestedPreFling</code>; consume the fling and settle to a valid
* position regardless.</li>
* <li>If a nested parent does consume the fling, this view should not scroll at all,
* even to settle back to a valid idle position.</li>
* </ul>
*
* <p>Views should also not offer fling velocities to nested parent views along an axis
* where scrolling is not currently supported; a {@link android.widget.ScrollView ScrollView}
* should not offer a horizontal fling velocity to its parents since scrolling along that
* axis is not permitted and carrying velocity along that motion does not make sense.</p>
*
* @param velocityX Horizontal fling velocity in pixels per second
* @param velocityY Vertical fling velocity in pixels per second
* @return true if a nested scrolling parent consumed the fling
*/
public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
if (isNestedScrollingEnabled() && mNestedScrollingParent != null) {
return mNestedScrollingParent.onNestedPreFling(this, velocityX, velocityY);
}
return false;
}
/**
* Gets a scale factor that determines the distance the view should scroll
* vertically in response to {@link MotionEvent#ACTION_SCROLL}.
* @return The vertical scroll scale factor.
* @hide
*/
protected float getVerticalScrollFactor() {
if (mVerticalScrollFactor == 0) {
TypedValue outValue = new TypedValue();
if (!mContext.getTheme().resolveAttribute(
com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) {
throw new IllegalStateException(
"Expected theme to define listPreferredItemHeight.");
}
mVerticalScrollFactor = outValue.getDimension(
mContext.getResources().getDisplayMetrics());
}
return mVerticalScrollFactor;
}
/**
* Gets a scale factor that determines the distance the view should scroll
* horizontally in response to {@link MotionEvent#ACTION_SCROLL}.
* @return The horizontal scroll scale factor.
* @hide
*/
protected float getHorizontalScrollFactor() {
// TODO: Should use something else.
return getVerticalScrollFactor();
}
/**
* Return the value specifying the text direction or policy that was set with
* {@link #setTextDirection(int)}.
*
* @return the defined text direction. It can be one of:
*
* {@link #TEXT_DIRECTION_INHERIT},
* {@link #TEXT_DIRECTION_FIRST_STRONG},
* {@link #TEXT_DIRECTION_ANY_RTL},
* {@link #TEXT_DIRECTION_LTR},
* {@link #TEXT_DIRECTION_RTL},
* {@link #TEXT_DIRECTION_LOCALE},
* {@link #TEXT_DIRECTION_FIRST_STRONG_LTR},
* {@link #TEXT_DIRECTION_FIRST_STRONG_RTL}
*
* @attr ref android.R.styleable#View_textDirection
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "text", mapping = {
@ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG_LTR, to = "FIRST_STRONG_LTR"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG_RTL, to = "FIRST_STRONG_RTL")
})
public int getRawTextDirection() {
return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT;
}
/**
* Set the text direction.
*
* @param textDirection the direction to set. Should be one of:
*
* {@link #TEXT_DIRECTION_INHERIT},
* {@link #TEXT_DIRECTION_FIRST_STRONG},
* {@link #TEXT_DIRECTION_ANY_RTL},
* {@link #TEXT_DIRECTION_LTR},
* {@link #TEXT_DIRECTION_RTL},
* {@link #TEXT_DIRECTION_LOCALE}
* {@link #TEXT_DIRECTION_FIRST_STRONG_LTR},
* {@link #TEXT_DIRECTION_FIRST_STRONG_RTL},
*
* Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution
* proceeds up the parent chain of the view to get the value. If there is no parent, then it will
* return the default {@link #TEXT_DIRECTION_FIRST_STRONG}.
*
* @attr ref android.R.styleable#View_textDirection
*/
public void setTextDirection(int textDirection) {
if (getRawTextDirection() != textDirection) {
// Reset the current text direction and the resolved one
mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK;
resetResolvedTextDirection();
// Set the new text direction
mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK);
// Do resolution
resolveTextDirection();
// Notify change
onRtlPropertiesChanged(getLayoutDirection());
// Refresh
requestLayout();
invalidate(true);
}
}
/**
* Return the resolved text direction.
*
* @return the resolved text direction. Returns one of:
*
* {@link #TEXT_DIRECTION_FIRST_STRONG},
* {@link #TEXT_DIRECTION_ANY_RTL},
* {@link #TEXT_DIRECTION_LTR},
* {@link #TEXT_DIRECTION_RTL},
* {@link #TEXT_DIRECTION_LOCALE},
* {@link #TEXT_DIRECTION_FIRST_STRONG_LTR},
* {@link #TEXT_DIRECTION_FIRST_STRONG_RTL}
*
* @attr ref android.R.styleable#View_textDirection
*/
@ViewDebug.ExportedProperty(category = "text", mapping = {
@ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG_LTR, to = "FIRST_STRONG_LTR"),
@ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG_RTL, to = "FIRST_STRONG_RTL")
})
public int getTextDirection() {
return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT;
}
/**
* Resolve the text direction.
*
* @return true if resolution has been done, false otherwise.
*
* @hide
*/
public boolean resolveTextDirection() {
// Reset any previous text direction resolution
mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK);
if (hasRtlSupport()) {
// Set resolved text direction flag depending on text direction flag
final int textDirection = getRawTextDirection();
switch(textDirection) {
case TEXT_DIRECTION_INHERIT:
if (!canResolveTextDirection()) {
// We cannot do the resolution if there is no parent, so use the default one
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
// Resolution will need to happen again later
return false;
}
// Parent has not yet resolved, so we still return the default
try {
if (!mParent.isTextDirectionResolved()) {
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
// Resolution will need to happen again later
return false;
}
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED |
PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
return true;
}
// Set current resolved direction to the same value as the parent's one
int parentResolvedDirection;
try {
parentResolvedDirection = mParent.getTextDirection();
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
parentResolvedDirection = TEXT_DIRECTION_LTR;
}
switch (parentResolvedDirection) {
case TEXT_DIRECTION_FIRST_STRONG:
case TEXT_DIRECTION_ANY_RTL:
case TEXT_DIRECTION_LTR:
case TEXT_DIRECTION_RTL:
case TEXT_DIRECTION_LOCALE:
case TEXT_DIRECTION_FIRST_STRONG_LTR:
case TEXT_DIRECTION_FIRST_STRONG_RTL:
mPrivateFlags2 |=
(parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT);
break;
default:
// Default resolved direction is "first strong" heuristic
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
}
break;
case TEXT_DIRECTION_FIRST_STRONG:
case TEXT_DIRECTION_ANY_RTL:
case TEXT_DIRECTION_LTR:
case TEXT_DIRECTION_RTL:
case TEXT_DIRECTION_LOCALE:
case TEXT_DIRECTION_FIRST_STRONG_LTR:
case TEXT_DIRECTION_FIRST_STRONG_RTL:
// Resolved direction is the same as text direction
mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT);
break;
default:
// Default resolved direction is "first strong" heuristic
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
}
} else {
// Default resolved direction is "first strong" heuristic
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
}
// Set to resolved
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED;
return true;
}
/**
* Check if text direction resolution can be done.
*
* @return true if text direction resolution can be done otherwise return false.
*/
public boolean canResolveTextDirection() {
switch (getRawTextDirection()) {
case TEXT_DIRECTION_INHERIT:
if (mParent != null) {
try {
return mParent.canResolveTextDirection();
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
}
}
return false;
default:
return true;
}
}
/**
* Reset resolved text direction. Text direction will be resolved during a call to
* {@link #onMeasure(int, int)}.
*
* @hide
*/
public void resetResolvedTextDirection() {
// Reset any previous text direction resolution
mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK);
// Set to default value
mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT;
}
/**
* @return true if text direction is inherited.
*
* @hide
*/
public boolean isTextDirectionInherited() {
return (getRawTextDirection() == TEXT_DIRECTION_INHERIT);
}
/**
* @return true if text direction is resolved.
*/
public boolean isTextDirectionResolved() {
return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED;
}
/**
* Return the value specifying the text alignment or policy that was set with
* {@link #setTextAlignment(int)}.
*
* @return the defined text alignment. It can be one of:
*
* {@link #TEXT_ALIGNMENT_INHERIT},
* {@link #TEXT_ALIGNMENT_GRAVITY},
* {@link #TEXT_ALIGNMENT_CENTER},
* {@link #TEXT_ALIGNMENT_TEXT_START},
* {@link #TEXT_ALIGNMENT_TEXT_END},
* {@link #TEXT_ALIGNMENT_VIEW_START},
* {@link #TEXT_ALIGNMENT_VIEW_END}
*
* @attr ref android.R.styleable#View_textAlignment
*
* @hide
*/
@ViewDebug.ExportedProperty(category = "text", mapping = {
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END")
})
@TextAlignment
public int getRawTextAlignment() {
return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT;
}
/**
* Set the text alignment.
*
* @param textAlignment The text alignment to set. Should be one of
*
* {@link #TEXT_ALIGNMENT_INHERIT},
* {@link #TEXT_ALIGNMENT_GRAVITY},
* {@link #TEXT_ALIGNMENT_CENTER},
* {@link #TEXT_ALIGNMENT_TEXT_START},
* {@link #TEXT_ALIGNMENT_TEXT_END},
* {@link #TEXT_ALIGNMENT_VIEW_START},
* {@link #TEXT_ALIGNMENT_VIEW_END}
*
* Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution
* proceeds up the parent chain of the view to get the value. If there is no parent, then it
* will return the default {@link #TEXT_ALIGNMENT_GRAVITY}.
*
* @attr ref android.R.styleable#View_textAlignment
*/
public void setTextAlignment(@TextAlignment int textAlignment) {
if (textAlignment != getRawTextAlignment()) {
// Reset the current and resolved text alignment
mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK;
resetResolvedTextAlignment();
// Set the new text alignment
mPrivateFlags2 |=
((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK);
// Do resolution
resolveTextAlignment();
// Notify change
onRtlPropertiesChanged(getLayoutDirection());
// Refresh
requestLayout();
invalidate(true);
}
}
/**
* Return the resolved text alignment.
*
* @return the resolved text alignment. Returns one of:
*
* {@link #TEXT_ALIGNMENT_GRAVITY},
* {@link #TEXT_ALIGNMENT_CENTER},
* {@link #TEXT_ALIGNMENT_TEXT_START},
* {@link #TEXT_ALIGNMENT_TEXT_END},
* {@link #TEXT_ALIGNMENT_VIEW_START},
* {@link #TEXT_ALIGNMENT_VIEW_END}
*
* @attr ref android.R.styleable#View_textAlignment
*/
@ViewDebug.ExportedProperty(category = "text", mapping = {
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"),
@ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END")
})
@TextAlignment
public int getTextAlignment() {
return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >>
PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT;
}
/**
* Resolve the text alignment.
*
* @return true if resolution has been done, false otherwise.
*
* @hide
*/
public boolean resolveTextAlignment() {
// Reset any previous text alignment resolution
mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK);
if (hasRtlSupport()) {
// Set resolved text alignment flag depending on text alignment flag
final int textAlignment = getRawTextAlignment();
switch (textAlignment) {
case TEXT_ALIGNMENT_INHERIT:
// Check if we can resolve the text alignment
if (!canResolveTextAlignment()) {
// We cannot do the resolution if there is no parent so use the default
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
// Resolution will need to happen again later
return false;
}
// Parent has not yet resolved, so we still return the default
try {
if (!mParent.isTextAlignmentResolved()) {
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
// Resolution will need to happen again later
return false;
}
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED |
PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
return true;
}
int parentResolvedTextAlignment;
try {
parentResolvedTextAlignment = mParent.getTextAlignment();
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY;
}
switch (parentResolvedTextAlignment) {
case TEXT_ALIGNMENT_GRAVITY:
case TEXT_ALIGNMENT_TEXT_START:
case TEXT_ALIGNMENT_TEXT_END:
case TEXT_ALIGNMENT_CENTER:
case TEXT_ALIGNMENT_VIEW_START:
case TEXT_ALIGNMENT_VIEW_END:
// Resolved text alignment is the same as the parent resolved
// text alignment
mPrivateFlags2 |=
(parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT);
break;
default:
// Use default resolved text alignment
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
}
break;
case TEXT_ALIGNMENT_GRAVITY:
case TEXT_ALIGNMENT_TEXT_START:
case TEXT_ALIGNMENT_TEXT_END:
case TEXT_ALIGNMENT_CENTER:
case TEXT_ALIGNMENT_VIEW_START:
case TEXT_ALIGNMENT_VIEW_END:
// Resolved text alignment is the same as text alignment
mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT);
break;
default:
// Use default resolved text alignment
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
}
} else {
// Use default resolved text alignment
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
}
// Set the resolved
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED;
return true;
}
/**
* Check if text alignment resolution can be done.
*
* @return true if text alignment resolution can be done otherwise return false.
*/
public boolean canResolveTextAlignment() {
switch (getRawTextAlignment()) {
case TEXT_DIRECTION_INHERIT:
if (mParent != null) {
try {
return mParent.canResolveTextAlignment();
} catch (AbstractMethodError e) {
Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
}
}
return false;
default:
return true;
}
}
/**
* Reset resolved text alignment. Text alignment will be resolved during a call to
* {@link #onMeasure(int, int)}.
*
* @hide
*/
public void resetResolvedTextAlignment() {
// Reset any previous text alignment resolution
mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK);
// Set to default
mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT;
}
/**
* @return true if text alignment is inherited.
*
* @hide
*/
public boolean isTextAlignmentInherited() {
return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT);
}
/**
* @return true if text alignment is resolved.
*/
public boolean isTextAlignmentResolved() {
return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED;
}
/**
* Generate a value suitable for use in {@link #setId(int)}.
* This value will not collide with ID values generated at build time by aapt for R.id.
*
* @return a generated ID value
*/
public static int generateViewId() {
for (;;) {
final int result = sNextGeneratedId.get();
// aapt-generated IDs have the high byte nonzero; clamp to the range under that.
int newValue = result + 1;
if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
if (sNextGeneratedId.compareAndSet(result, newValue)) {
return result;
}
}
}
/**
* Gets the Views in the hierarchy affected by entering and exiting Activity Scene transitions.
* @param transitioningViews This View will be added to transitioningViews if it is VISIBLE and
* a normal View or a ViewGroup with
* {@link android.view.ViewGroup#isTransitionGroup()} true.
* @hide
*/
public void captureTransitioningViews(List<View> transitioningViews) {
if (getVisibility() == View.VISIBLE) {
transitioningViews.add(this);
}
}
/**
* Adds all Views that have {@link #getTransitionName()} non-null to namedElements.
* @param namedElements Will contain all Views in the hierarchy having a transitionName.
* @hide
*/
public void findNamedViews(Map<String, View> namedElements) {
if (getVisibility() == VISIBLE || mGhostView != null) {
String transitionName = getTransitionName();
if (transitionName != null) {
namedElements.put(transitionName, this);
}
}
}
/**
* Returns the pointer icon for the motion event, or null if it doesn't specify the icon.
* The default implementation does not care the location or event types, but some subclasses
* may use it (such as WebViews).
* @param event The MotionEvent from a mouse
* @param pointerIndex The index of the pointer for which to retrieve the {@link PointerIcon}.
* This will be between 0 and {@link MotionEvent#getPointerCount()}.
* @see PointerIcon
*/
public PointerIcon onResolvePointerIcon(MotionEvent event, int pointerIndex) {
final float x = event.getX(pointerIndex);
final float y = event.getY(pointerIndex);
if (isDraggingScrollBar() || isOnScrollbarThumb(x, y)) {
return PointerIcon.getSystemIcon(mContext, PointerIcon.TYPE_ARROW);
}
return mPointerIcon;
}
/**
* Set the pointer icon for the current view.
* Passing {@code null} will restore the pointer icon to its default value.
* @param pointerIcon A PointerIcon instance which will be shown when the mouse hovers.
*/
public void setPointerIcon(PointerIcon pointerIcon) {
mPointerIcon = pointerIcon;
if (mAttachInfo == null || mAttachInfo.mHandlingPointerEvent) {
return;
}
try {
mAttachInfo.mSession.updatePointerIcon(mAttachInfo.mWindow);
} catch (RemoteException e) {
}
}
/**
* Gets the pointer icon for the current view.
*/
public PointerIcon getPointerIcon() {
return mPointerIcon;
}
//
// Properties
//
/**
* A Property wrapper around the <code>alpha</code> functionality handled by the
* {@link View#setAlpha(float)} and {@link View#getAlpha()} methods.
*/
public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") {
@Override
public void setValue(View object, float value) {
object.setAlpha(value);
}
@Override
public Float get(View object) {
return object.getAlpha();
}
};
/**
* A Property wrapper around the <code>translationX</code> functionality handled by the
* {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods.
*/
public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") {
@Override
public void setValue(View object, float value) {
object.setTranslationX(value);
}
@Override
public Float get(View object) {
return object.getTranslationX();
}
};
/**
* A Property wrapper around the <code>translationY</code> functionality handled by the
* {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods.
*/
public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") {
@Override
public void setValue(View object, float value) {
object.setTranslationY(value);
}
@Override
public Float get(View object) {
return object.getTranslationY();
}
};
/**
* A Property wrapper around the <code>translationZ</code> functionality handled by the
* {@link View#setTranslationZ(float)} and {@link View#getTranslationZ()} methods.
*/
public static final Property<View, Float> TRANSLATION_Z = new FloatProperty<View>("translationZ") {
@Override
public void setValue(View object, float value) {
object.setTranslationZ(value);
}
@Override
public Float get(View object) {
return object.getTranslationZ();
}
};
/**
* A Property wrapper around the <code>x</code> functionality handled by the
* {@link View#setX(float)} and {@link View#getX()} methods.
*/
public static final Property<View, Float> X = new FloatProperty<View>("x") {
@Override
public void setValue(View object, float value) {
object.setX(value);
}
@Override
public Float get(View object) {
return object.getX();
}
};
/**
* A Property wrapper around the <code>y</code> functionality handled by the
* {@link View#setY(float)} and {@link View#getY()} methods.
*/
public static final Property<View, Float> Y = new FloatProperty<View>("y") {
@Override
public void setValue(View object, float value) {
object.setY(value);
}
@Override
public Float get(View object) {
return object.getY();
}
};
/**
* A Property wrapper around the <code>z</code> functionality handled by the
* {@link View#setZ(float)} and {@link View#getZ()} methods.
*/
public static final Property<View, Float> Z = new FloatProperty<View>("z") {
@Override
public void setValue(View object, float value) {
object.setZ(value);
}
@Override
public Float get(View object) {
return object.getZ();
}
};
/**
* A Property wrapper around the <code>rotation</code> functionality handled by the
* {@link View#setRotation(float)} and {@link View#getRotation()} methods.
*/
public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") {
@Override
public void setValue(View object, float value) {
object.setRotation(value);
}
@Override
public Float get(View object) {
return object.getRotation();
}
};
/**
* A Property wrapper around the <code>rotationX</code> functionality handled by the
* {@link View#setRotationX(float)} and {@link View#getRotationX()} methods.
*/
public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") {
@Override
public void setValue(View object, float value) {
object.setRotationX(value);
}
@Override
public Float get(View object) {
return object.getRotationX();
}
};
/**
* A Property wrapper around the <code>rotationY</code> functionality handled by the
* {@link View#setRotationY(float)} and {@link View#getRotationY()} methods.
*/
public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") {
@Override
public void setValue(View object, float value) {
object.setRotationY(value);
}
@Override
public Float get(View object) {
return object.getRotationY();
}
};
/**
* A Property wrapper around the <code>scaleX</code> functionality handled by the
* {@link View#setScaleX(float)} and {@link View#getScaleX()} methods.
*/
public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") {
@Override
public void setValue(View object, float value) {
object.setScaleX(value);
}
@Override
public Float get(View object) {
return object.getScaleX();
}
};
/**
* A Property wrapper around the <code>scaleY</code> functionality handled by the
* {@link View#setScaleY(float)} and {@link View#getScaleY()} methods.
*/
public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") {
@Override
public void setValue(View object, float value) {
object.setScaleY(value);
}
@Override
public Float get(View object) {
return object.getScaleY();
}
};
/**
* A MeasureSpec encapsulates the layout requirements passed from parent to child.
* Each MeasureSpec represents a requirement for either the width or the height.
* A MeasureSpec is comprised of a size and a mode. There are three possible
* modes:
* <dl>
* <dt>UNSPECIFIED</dt>
* <dd>
* The parent has not imposed any constraint on the child. It can be whatever size
* it wants.
* </dd>
*
* <dt>EXACTLY</dt>
* <dd>
* The parent has determined an exact size for the child. The child is going to be
* given those bounds regardless of how big it wants to be.
* </dd>
*
* <dt>AT_MOST</dt>
* <dd>
* The child can be as large as it wants up to the specified size.
* </dd>
* </dl>
*
* MeasureSpecs are implemented as ints to reduce object allocation. This class
* is provided to pack and unpack the <size, mode> tuple into the int.
*/
public static class MeasureSpec {
private static final int MODE_SHIFT = 30;
private static final int MODE_MASK = 0x3 << MODE_SHIFT;
/** @hide */
@IntDef({UNSPECIFIED, EXACTLY, AT_MOST})
@Retention(RetentionPolicy.SOURCE)
public @interface MeasureSpecMode {}
/**
* Measure specification mode: The parent has not imposed any constraint
* on the child. It can be whatever size it wants.
*/
public static final int UNSPECIFIED = 0 << MODE_SHIFT;
/**
* Measure specification mode: The parent has determined an exact size
* for the child. The child is going to be given those bounds regardless
* of how big it wants to be.
*/
public static final int EXACTLY = 1 << MODE_SHIFT;
/**
* Measure specification mode: The child can be as large as it wants up
* to the specified size.
*/
public static final int AT_MOST = 2 << MODE_SHIFT;
/**
* Creates a measure specification based on the supplied size and mode.
*
* The mode must always be one of the following:
* <ul>
* <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li>
* <li>{@link android.view.View.MeasureSpec#EXACTLY}</li>
* <li>{@link android.view.View.MeasureSpec#AT_MOST}</li>
* </ul>
*
* <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's
* implementation was such that the order of arguments did not matter
* and overflow in either value could impact the resulting MeasureSpec.
* {@link android.widget.RelativeLayout} was affected by this bug.
* Apps targeting API levels greater than 17 will get the fixed, more strict
* behavior.</p>
*
* @param size the size of the measure specification
* @param mode the mode of the measure specification
* @return the measure specification based on size and mode
*/
public static int makeMeasureSpec(@IntRange(from = 0, to = (1 << MeasureSpec.MODE_SHIFT) - 1) int size,
@MeasureSpecMode int mode) {
if (sUseBrokenMakeMeasureSpec) {
return size + mode;
} else {
return (size & ~MODE_MASK) | (mode & MODE_MASK);
}
}
/**
* Like {@link #makeMeasureSpec(int, int)}, but any spec with a mode of UNSPECIFIED
* will automatically get a size of 0. Older apps expect this.
*
* @hide internal use only for compatibility with system widgets and older apps
*/
public static int makeSafeMeasureSpec(int size, int mode) {
if (sUseZeroUnspecifiedMeasureSpec && mode == UNSPECIFIED) {
return 0;
}
return makeMeasureSpec(size, mode);
}
/**
* Extracts the mode from the supplied measure specification.
*
* @param measureSpec the measure specification to extract the mode from
* @return {@link android.view.View.MeasureSpec#UNSPECIFIED},
* {@link android.view.View.MeasureSpec#AT_MOST} or
* {@link android.view.View.MeasureSpec#EXACTLY}
*/
@MeasureSpecMode
public static int getMode(int measureSpec) {
//noinspection ResourceType
return (measureSpec & MODE_MASK);
}
/**
* Extracts the size from the supplied measure specification.
*
* @param measureSpec the measure specification to extract the size from
* @return the size in pixels defined in the supplied measure specification
*/
public static int getSize(int measureSpec) {
return (measureSpec & ~MODE_MASK);
}
static int adjust(int measureSpec, int delta) {
final int mode = getMode(measureSpec);
int size = getSize(measureSpec);
if (mode == UNSPECIFIED) {
// No need to adjust size for UNSPECIFIED mode.
return makeMeasureSpec(size, UNSPECIFIED);
}
size += delta;
if (size < 0) {
Log.e(VIEW_LOG_TAG, "MeasureSpec.adjust: new size would be negative! (" + size +
") spec: " + toString(measureSpec) + " delta: " + delta);
size = 0;
}
return makeMeasureSpec(size, mode);
}
/**
* Returns a String representation of the specified measure
* specification.
*
* @param measureSpec the measure specification to convert to a String
* @return a String with the following format: "MeasureSpec: MODE SIZE"
*/
public static String toString(int measureSpec) {
int mode = getMode(measureSpec);
int size = getSize(measureSpec);
StringBuilder sb = new StringBuilder("MeasureSpec: ");
if (mode == UNSPECIFIED)
sb.append("UNSPECIFIED ");
else if (mode == EXACTLY)
sb.append("EXACTLY ");
else if (mode == AT_MOST)
sb.append("AT_MOST ");
else
sb.append(mode).append(" ");
sb.append(size);
return sb.toString();
}
}
private final class CheckForLongPress implements Runnable {
private int mOriginalWindowAttachCount;
private float mX;
private float mY;
@Override
public void run() {
if (isPressed() && (mParent != null)
&& mOriginalWindowAttachCount == mWindowAttachCount) {
if (performLongClick(mX, mY)) {
mHasPerformedLongPress = true;
}
}
}
public void setAnchor(float x, float y) {
mX = x;
mY = y;
}
public void rememberWindowAttachCount() {
mOriginalWindowAttachCount = mWindowAttachCount;
}
}
private final class CheckForTap implements Runnable {
public float x;
public float y;
@Override
public void run() {
mPrivateFlags &= ~PFLAG_PREPRESSED;
setPressed(true, x, y);
checkForLongClick(ViewConfiguration.getTapTimeout(), x, y);
}
}
private final class PerformClick implements Runnable {
@Override
public void run() {
performClick();
}
}
/**
* This method returns a ViewPropertyAnimator object, which can be used to animate
* specific properties on this View.
*
* @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View.
*/
public ViewPropertyAnimator animate() {
if (mAnimator == null) {
mAnimator = new ViewPropertyAnimator(this);
}
return mAnimator;
}
/**
* Sets the name of the View to be used to identify Views in Transitions.
* Names should be unique in the View hierarchy.
*
* @param transitionName The name of the View to uniquely identify it for Transitions.
*/
public final void setTransitionName(String transitionName) {
mTransitionName = transitionName;
}
/**
* Returns the name of the View to be used to identify Views in Transitions.
* Names should be unique in the View hierarchy.
*
* <p>This returns null if the View has not been given a name.</p>
*
* @return The name used of the View to be used to identify Views in Transitions or null
* if no name has been given.
*/
@ViewDebug.ExportedProperty
public String getTransitionName() {
return mTransitionName;
}
/**
* @hide
*/
public void requestKeyboardShortcuts(List<KeyboardShortcutGroup> data, int deviceId) {
// Do nothing.
}
/**
* Interface definition for a callback to be invoked when a hardware key event is
* dispatched to this view. The callback will be invoked before the key event is
* given to the view. This is only useful for hardware keyboards; a software input
* method has no obligation to trigger this listener.
*/
public interface OnKeyListener {
/**
* Called when a hardware key is dispatched to a view. This allows listeners to
* get a chance to respond before the target view.
* <p>Key presses in software keyboards will generally NOT trigger this method,
* although some may elect to do so in some situations. Do not assume a
* software input method has to be key-based; even if it is, it may use key presses
* in a different way than you expect, so there is no way to reliably catch soft
* input key presses.
*
* @param v The view the key has been dispatched to.
* @param keyCode The code for the physical key that was pressed
* @param event The KeyEvent object containing full information about
* the event.
* @return True if the listener has consumed the event, false otherwise.
*/
boolean onKey(View v, int keyCode, KeyEvent event);
}
/**
* Interface definition for a callback to be invoked when a touch event is
* dispatched to this view. The callback will be invoked before the touch
* event is given to the view.
*/
public interface OnTouchListener {
/**
* Called when a touch event is dispatched to a view. This allows listeners to
* get a chance to respond before the target view.
*
* @param v The view the touch event has been dispatched to.
* @param event The MotionEvent object containing full information about
* the event.
* @return True if the listener has consumed the event, false otherwise.
*/
boolean onTouch(View v, MotionEvent event);
}
/**
* Interface definition for a callback to be invoked when a hover event is
* dispatched to this view. The callback will be invoked before the hover
* event is given to the view.
*/
public interface OnHoverListener {
/**
* Called when a hover event is dispatched to a view. This allows listeners to
* get a chance to respond before the target view.
*
* @param v The view the hover event has been dispatched to.
* @param event The MotionEvent object containing full information about
* the event.
* @return True if the listener has consumed the event, false otherwise.
*/
boolean onHover(View v, MotionEvent event);
}
/**
* Interface definition for a callback to be invoked when a generic motion event is
* dispatched to this view. The callback will be invoked before the generic motion
* event is given to the view.
*/
public interface OnGenericMotionListener {
/**
* Called when a generic motion event is dispatched to a view. This allows listeners to
* get a chance to respond before the target view.
*
* @param v The view the generic motion event has been dispatched to.
* @param event The MotionEvent object containing full information about
* the event.
* @return True if the listener has consumed the event, false otherwise.
*/
boolean onGenericMotion(View v, MotionEvent event);
}
/**
* Interface definition for a callback to be invoked when a view has been clicked and held.
*/
public interface OnLongClickListener {
/**
* Called when a view has been clicked and held.
*
* @param v The view that was clicked and held.
*
* @return true if the callback consumed the long click, false otherwise.
*/
boolean onLongClick(View v);
}
/**
* Interface definition for a callback to be invoked when a drag is being dispatched
* to this view. The callback will be invoked before the hosting view's own
* onDrag(event) method. If the listener wants to fall back to the hosting view's
* onDrag(event) behavior, it should return 'false' from this callback.
*
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For a guide to implementing drag and drop features, read the
* <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p>
* </div>
*/
public interface OnDragListener {
/**
* Called when a drag event is dispatched to a view. This allows listeners
* to get a chance to override base View behavior.
*
* @param v The View that received the drag event.
* @param event The {@link android.view.DragEvent} object for the drag event.
* @return {@code true} if the drag event was handled successfully, or {@code false}
* if the drag event was not handled. Note that {@code false} will trigger the View
* to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler.
*/
boolean onDrag(View v, DragEvent event);
}
/**
* Interface definition for a callback to be invoked when the focus state of
* a view changed.
*/
public interface OnFocusChangeListener {
/**
* Called when the focus state of a view has changed.
*
* @param v The view whose state has changed.
* @param hasFocus The new focus state of v.
*/
void onFocusChange(View v, boolean hasFocus);
}
/**
* Interface definition for a callback to be invoked when a view is clicked.
*/
public interface OnClickListener {
/**
* Called when a view has been clicked.
*
* @param v The view that was clicked.
*/
void onClick(View v);
}
/**
* Interface definition for a callback to be invoked when a view is context clicked.
*/
public interface OnContextClickListener {
/**
* Called when a view is context clicked.
*
* @param v The view that has been context clicked.
* @return true if the callback consumed the context click, false otherwise.
*/
boolean onContextClick(View v);
}
/**
* Interface definition for a callback to be invoked when the context menu
* for this view is being built.
*/
public interface OnCreateContextMenuListener {
/**
* Called when the context menu for this view is being built. It is not
* safe to hold onto the menu after this method returns.
*
* @param menu The context menu that is being built
* @param v The view for which the context menu is being built
* @param menuInfo Extra information about the item for which the
* context menu should be shown. This information will vary
* depending on the class of v.
*/
void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo);
}
/**
* Interface definition for a callback to be invoked when the status bar changes
* visibility. This reports <strong>global</strong> changes to the system UI
* state, not what the application is requesting.
*
* @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener)
*/
public interface OnSystemUiVisibilityChangeListener {
/**
* Called when the status bar changes visibility because of a call to
* {@link View#setSystemUiVisibility(int)}.
*
* @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE},
* {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}.
* This tells you the <strong>global</strong> state of these UI visibility
* flags, not what your app is currently applying.
*/
public void onSystemUiVisibilityChange(int visibility);
}
/**
* Interface definition for a callback to be invoked when this view is attached
* or detached from its window.
*/
public interface OnAttachStateChangeListener {
/**
* Called when the view is attached to a window.
* @param v The view that was attached
*/
public void onViewAttachedToWindow(View v);
/**
* Called when the view is detached from a window.
* @param v The view that was detached
*/
public void onViewDetachedFromWindow(View v);
}
/**
* Listener for applying window insets on a view in a custom way.
*
* <p>Apps may choose to implement this interface if they want to apply custom policy
* to the way that window insets are treated for a view. If an OnApplyWindowInsetsListener
* is set, its
* {@link OnApplyWindowInsetsListener#onApplyWindowInsets(View, WindowInsets) onApplyWindowInsets}
* method will be called instead of the View's own
* {@link #onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method. The listener
* may optionally call the parameter View's <code>onApplyWindowInsets</code> method to apply
* the View's normal behavior as part of its own.</p>
*/
public interface OnApplyWindowInsetsListener {
/**
* When {@link View#setOnApplyWindowInsetsListener(View.OnApplyWindowInsetsListener) set}
* on a View, this listener method will be called instead of the view's own
* {@link View#onApplyWindowInsets(WindowInsets) onApplyWindowInsets} method.
*
* @param v The view applying window insets
* @param insets The insets to apply
* @return The insets supplied, minus any insets that were consumed
*/
public WindowInsets onApplyWindowInsets(View v, WindowInsets insets);
}
private final class UnsetPressedState implements Runnable {
@Override
public void run() {
setPressed(false);
}
}
/**
* Base class for derived classes that want to save and restore their own
* state in {@link android.view.View#onSaveInstanceState()}.
*/
public static class BaseSavedState extends AbsSavedState {
String mStartActivityRequestWhoSaved;
/**
* Constructor used when reading from a parcel. Reads the state of the superclass.
*
* @param source parcel to read from
*/
public BaseSavedState(Parcel source) {
this(source, null);
}
/**
* Constructor used when reading from a parcel using a given class loader.
* Reads the state of the superclass.
*
* @param source parcel to read from
* @param loader ClassLoader to use for reading
*/
public BaseSavedState(Parcel source, ClassLoader loader) {
super(source, loader);
mStartActivityRequestWhoSaved = source.readString();
}
/**
* Constructor called by derived classes when creating their SavedState objects
*
* @param superState The state of the superclass of this view
*/
public BaseSavedState(Parcelable superState) {
super(superState);
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeString(mStartActivityRequestWhoSaved);
}
public static final Parcelable.Creator<BaseSavedState> CREATOR
= new Parcelable.ClassLoaderCreator<BaseSavedState>() {
@Override
public BaseSavedState createFromParcel(Parcel in) {
return new BaseSavedState(in);
}
@Override
public BaseSavedState createFromParcel(Parcel in, ClassLoader loader) {
return new BaseSavedState(in, loader);
}
@Override
public BaseSavedState[] newArray(int size) {
return new BaseSavedState[size];
}
};
}
/**
* A set of information given to a view when it is attached to its parent
* window.
*/
final static class AttachInfo {
interface Callbacks {
void playSoundEffect(int effectId);
boolean performHapticFeedback(int effectId, boolean always);
}
/**
* InvalidateInfo is used to post invalidate(int, int, int, int) messages
* to a Handler. This class contains the target (View) to invalidate and
* the coordinates of the dirty rectangle.
*
* For performance purposes, this class also implements a pool of up to
* POOL_LIMIT objects that get reused. This reduces memory allocations
* whenever possible.
*/
static class InvalidateInfo {
private static final int POOL_LIMIT = 10;
private static final SynchronizedPool<InvalidateInfo> sPool =
new SynchronizedPool<InvalidateInfo>(POOL_LIMIT);
View target;
int left;
int top;
int right;
int bottom;
public static InvalidateInfo obtain() {
InvalidateInfo instance = sPool.acquire();
return (instance != null) ? instance : new InvalidateInfo();
}
public void recycle() {
target = null;
sPool.release(this);
}
}
final IWindowSession mSession;
final IWindow mWindow;
final IBinder mWindowToken;
final Display mDisplay;
final Callbacks mRootCallbacks;
IWindowId mIWindowId;
WindowId mWindowId;
/**
* The top view of the hierarchy.
*/
View mRootView;
IBinder mPanelParentWindowToken;
boolean mHardwareAccelerated;
boolean mHardwareAccelerationRequested;
ThreadedRenderer mHardwareRenderer;
List<RenderNode> mPendingAnimatingRenderNodes;
/**
* The state of the display to which the window is attached, as reported
* by {@link Display#getState()}. Note that the display state constants
* declared by {@link Display} do not exactly line up with the screen state
* constants declared by {@link View} (there are more display states than
* screen states).
*/
int mDisplayState = Display.STATE_UNKNOWN;
/**
* Scale factor used by the compatibility mode
*/
float mApplicationScale;
/**
* Indicates whether the application is in compatibility mode
*/
boolean mScalingRequired;
/**
* Left position of this view's window
*/
int mWindowLeft;
/**
* Top position of this view's window
*/
int mWindowTop;
/**
* Indicates whether views need to use 32-bit drawing caches
*/
boolean mUse32BitDrawingCache;
/**
* For windows that are full-screen but using insets to layout inside
* of the screen areas, these are the current insets to appear inside
* the overscan area of the display.
*/
final Rect mOverscanInsets = new Rect();
/**
* For windows that are full-screen but using insets to layout inside
* of the screen decorations, these are the current insets for the
* content of the window.
*/
final Rect mContentInsets = new Rect();
/**
* For windows that are full-screen but using insets to layout inside
* of the screen decorations, these are the current insets for the
* actual visible parts of the window.
*/
final Rect mVisibleInsets = new Rect();
/**
* For windows that are full-screen but using insets to layout inside
* of the screen decorations, these are the current insets for the
* stable system windows.
*/
final Rect mStableInsets = new Rect();
/**
* For windows that include areas that are not covered by real surface these are the outsets
* for real surface.
*/
final Rect mOutsets = new Rect();
/**
* In multi-window we force show the navigation bar. Because we don't want that the surface
* size changes in this mode, we instead have a flag whether the navigation bar size should
* always be consumed, so the app is treated like there is no virtual navigation bar at all.
*/
boolean mAlwaysConsumeNavBar;
/**
* The internal insets given by this window. This value is
* supplied by the client (through
* {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will
* be given to the window manager when changed to be used in laying
* out windows behind it.
*/
final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets
= new ViewTreeObserver.InternalInsetsInfo();
/**
* Set to true when mGivenInternalInsets is non-empty.
*/
boolean mHasNonEmptyGivenInternalInsets;
/**
* All views in the window's hierarchy that serve as scroll containers,
* used to determine if the window can be resized or must be panned
* to adjust for a soft input area.
*/
final ArrayList<View> mScrollContainers = new ArrayList<View>();
final KeyEvent.DispatcherState mKeyDispatchState
= new KeyEvent.DispatcherState();
/**
* Indicates whether the view's window currently has the focus.
*/
boolean mHasWindowFocus;
/**
* The current visibility of the window.
*/
int mWindowVisibility;
/**
* Indicates the time at which drawing started to occur.
*/
long mDrawingTime;
/**
* Indicates whether or not ignoring the DIRTY_MASK flags.
*/
boolean mIgnoreDirtyState;
/**
* This flag tracks when the mIgnoreDirtyState flag is set during draw(),
* to avoid clearing that flag prematurely.
*/
boolean mSetIgnoreDirtyState = false;
/**
* Indicates whether the view's window is currently in touch mode.
*/
boolean mInTouchMode;
/**
* Indicates whether the view has requested unbuffered input dispatching for the current
* event stream.
*/
boolean mUnbufferedDispatchRequested;
/**
* Indicates that ViewAncestor should trigger a global layout change
* the next time it performs a traversal
*/
boolean mRecomputeGlobalAttributes;
/**
* Always report new attributes at next traversal.
*/
boolean mForceReportNewAttributes;
/**
* Set during a traveral if any views want to keep the screen on.
*/
boolean mKeepScreenOn;
/**
* Set during a traveral if the light center needs to be updated.
*/
boolean mNeedsUpdateLightCenter;
/**
* Bitwise-or of all of the values that views have passed to setSystemUiVisibility().
*/
int mSystemUiVisibility;
/**
* Hack to force certain system UI visibility flags to be cleared.
*/
int mDisabledSystemUiVisibility;
/**
* Last global system UI visibility reported by the window manager.
*/
int mGlobalSystemUiVisibility = -1;
/**
* True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener
* attached.
*/
boolean mHasSystemUiListeners;
/**
* Set if the window has requested to extend into the overscan region
* via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN.
*/
boolean mOverscanRequested;
/**
* Set if the visibility of any views has changed.
*/
boolean mViewVisibilityChanged;
/**
* Set to true if a view has been scrolled.
*/
boolean mViewScrollChanged;
/**
* Set to true if high contrast mode enabled
*/
boolean mHighContrastText;
/**
* Set to true if a pointer event is currently being handled.
*/
boolean mHandlingPointerEvent;
/**
* Global to the view hierarchy used as a temporary for dealing with
* x/y points in the transparent region computations.
*/
final int[] mTransparentLocation = new int[2];
/**
* Global to the view hierarchy used as a temporary for dealing with
* x/y points in the ViewGroup.invalidateChild implementation.
*/
final int[] mInvalidateChildLocation = new int[2];
/**
* Global to the view hierarchy used as a temporary for dealing with
* computing absolute on-screen location.
*/
final int[] mTmpLocation = new int[2];
/**
* Global to the view hierarchy used as a temporary for dealing with
* x/y location when view is transformed.
*/
final float[] mTmpTransformLocation = new float[2];
/**
* The view tree observer used to dispatch global events like
* layout, pre-draw, touch mode change, etc.
*/
final ViewTreeObserver mTreeObserver = new ViewTreeObserver();
/**
* A Canvas used by the view hierarchy to perform bitmap caching.
*/
Canvas mCanvas;
/**
* The view root impl.
*/
final ViewRootImpl mViewRootImpl;
/**
* A Handler supplied by a view's {@link android.view.ViewRootImpl}. This
* handler can be used to pump events in the UI events queue.
*/
final Handler mHandler;
/**
* Temporary for use in computing invalidate rectangles while
* calling up the hierarchy.
*/
final Rect mTmpInvalRect = new Rect();
/**
* Temporary for use in computing hit areas with transformed views
*/
final RectF mTmpTransformRect = new RectF();
/**
* Temporary for use in computing hit areas with transformed views
*/
final RectF mTmpTransformRect1 = new RectF();
/**
* Temporary list of rectanges.
*/
final List<RectF> mTmpRectList = new ArrayList<>();
/**
* Temporary for use in transforming invalidation rect
*/
final Matrix mTmpMatrix = new Matrix();
/**
* Temporary for use in transforming invalidation rect
*/
final Transformation mTmpTransformation = new Transformation();
/**
* Temporary for use in querying outlines from OutlineProviders
*/
final Outline mTmpOutline = new Outline();
/**
* Temporary list for use in collecting focusable descendents of a view.
*/
final ArrayList<View> mTempArrayList = new ArrayList<View>(24);
/**
* The id of the window for accessibility purposes.
*/
int mAccessibilityWindowId = AccessibilityNodeInfo.UNDEFINED_ITEM_ID;
/**
* Flags related to accessibility processing.
*
* @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS
* @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS
*/
int mAccessibilityFetchFlags;
/**
* The drawable for highlighting accessibility focus.
*/
Drawable mAccessibilityFocusDrawable;
/**
* Show where the margins, bounds and layout bounds are for each view.
*/
boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false);
/**
* Point used to compute visible regions.
*/
final Point mPoint = new Point();
/**
* Used to track which View originated a requestLayout() call, used when
* requestLayout() is called during layout.
*/
View mViewRequestingLayout;
/**
* Used to track views that need (at least) a partial relayout at their current size
* during the next traversal.
*/
List<View> mPartialLayoutViews = new ArrayList<>();
/**
* Swapped with mPartialLayoutViews during layout to avoid concurrent
* modification. Lazily assigned during ViewRootImpl layout.
*/
List<View> mEmptyPartialLayoutViews;
/**
* Used to track the identity of the current drag operation.
*/
IBinder mDragToken;
/**
* The drag shadow surface for the current drag operation.
*/
public Surface mDragSurface;
/**
* Creates a new set of attachment information with the specified
* events handler and thread.
*
* @param handler the events handler the view must use
*/
AttachInfo(IWindowSession session, IWindow window, Display display,
ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) {
mSession = session;
mWindow = window;
mWindowToken = window.asBinder();
mDisplay = display;
mViewRootImpl = viewRootImpl;
mHandler = handler;
mRootCallbacks = effectPlayer;
}
}
/**
* <p>ScrollabilityCache holds various fields used by a View when scrolling
* is supported. This avoids keeping too many unused fields in most
* instances of View.</p>
*/
private static class ScrollabilityCache implements Runnable {
/**
* Scrollbars are not visible
*/
public static final int OFF = 0;
/**
* Scrollbars are visible
*/
public static final int ON = 1;
/**
* Scrollbars are fading away
*/
public static final int FADING = 2;
public boolean fadeScrollBars;
public int fadingEdgeLength;
public int scrollBarDefaultDelayBeforeFade;
public int scrollBarFadeDuration;
public int scrollBarSize;
public ScrollBarDrawable scrollBar;
public float[] interpolatorValues;
public View host;
public final Paint paint;
public final Matrix matrix;
public Shader shader;
public final Interpolator scrollBarInterpolator = new Interpolator(1, 2);
private static final float[] OPAQUE = { 255 };
private static final float[] TRANSPARENT = { 0.0f };
/**
* When fading should start. This time moves into the future every time
* a new scroll happens. Measured based on SystemClock.uptimeMillis()
*/
public long fadeStartTime;
/**
* The current state of the scrollbars: ON, OFF, or FADING
*/
public int state = OFF;
private int mLastColor;
public final Rect mScrollBarBounds = new Rect();
public static final int NOT_DRAGGING = 0;
public static final int DRAGGING_VERTICAL_SCROLL_BAR = 1;
public static final int DRAGGING_HORIZONTAL_SCROLL_BAR = 2;
public int mScrollBarDraggingState = NOT_DRAGGING;
public float mScrollBarDraggingPos = 0;
public ScrollabilityCache(ViewConfiguration configuration, View host) {
fadingEdgeLength = configuration.getScaledFadingEdgeLength();
scrollBarSize = configuration.getScaledScrollBarSize();
scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay();
scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration();
paint = new Paint();
matrix = new Matrix();
// use use a height of 1, and then wack the matrix each time we
// actually use it.
shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
this.host = host;
}
public void setFadeColor(int color) {
if (color != mLastColor) {
mLastColor = color;
if (color != 0) {
shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000,
color & 0x00FFFFFF, Shader.TileMode.CLAMP);
paint.setShader(shader);
// Restore the default transfer mode (src_over)
paint.setXfermode(null);
} else {
shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP);
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
}
}
}
public void run() {
long now = AnimationUtils.currentAnimationTimeMillis();
if (now >= fadeStartTime) {
// the animation fades the scrollbars out by changing
// the opacity (alpha) from fully opaque to fully
// transparent
int nextFrame = (int) now;
int framesCount = 0;
Interpolator interpolator = scrollBarInterpolator;
// Start opaque
interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE);
// End transparent
nextFrame += scrollBarFadeDuration;
interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT);
state = FADING;
// Kick off the fade animation
host.invalidate(true);
}
}
}
/**
* Resuable callback for sending
* {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event.
*/
private class SendViewScrolledAccessibilityEvent implements Runnable {
public volatile boolean mIsPending;
public void run() {
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED);
mIsPending = false;
}
}
/**
* <p>
* This class represents a delegate that can be registered in a {@link View}
* to enhance accessibility support via composition rather via inheritance.
* It is specifically targeted to widget developers that extend basic View
* classes i.e. classes in package android.view, that would like their
* applications to be backwards compatible.
* </p>
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For more information about making applications accessible, read the
* <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a>
* developer guide.</p>
* </div>
* <p>
* A scenario in which a developer would like to use an accessibility delegate
* is overriding a method introduced in a later API version then the minimal API
* version supported by the application. For example, the method
* {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available
* in API version 4 when the accessibility APIs were first introduced. If a
* developer would like his application to run on API version 4 devices (assuming
* all other APIs used by the application are version 4 or lower) and take advantage
* of this method, instead of overriding the method which would break the application's
* backwards compatibility, he can override the corresponding method in this
* delegate and register the delegate in the target View if the API version of
* the system is high enough i.e. the API version is same or higher to the API
* version that introduced
* {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}.
* </p>
* <p>
* Here is an example implementation:
* </p>
* <code><pre><p>
* if (Build.VERSION.SDK_INT >= 14) {
* // If the API version is equal of higher than the version in
* // which onInitializeAccessibilityNodeInfo was introduced we
* // register a delegate with a customized implementation.
* View view = findViewById(R.id.view_id);
* view.setAccessibilityDelegate(new AccessibilityDelegate() {
* public void onInitializeAccessibilityNodeInfo(View host,
* AccessibilityNodeInfo info) {
* // Let the default implementation populate the info.
* super.onInitializeAccessibilityNodeInfo(host, info);
* // Set some other information.
* info.setEnabled(host.isEnabled());
* }
* });
* }
* </code></pre></p>
* <p>
* This delegate contains methods that correspond to the accessibility methods
* in View. If a delegate has been specified the implementation in View hands
* off handling to the corresponding method in this delegate. The default
* implementation the delegate methods behaves exactly as the corresponding
* method in View for the case of no accessibility delegate been set. Hence,
* to customize the behavior of a View method, clients can override only the
* corresponding delegate method without altering the behavior of the rest
* accessibility related methods of the host view.
* </p>
* <p>
* <strong>Note:</strong> On platform versions prior to
* {@link android.os.Build.VERSION_CODES#M API 23}, delegate methods on
* views in the {@code android.widget.*} package are called <i>before</i>
* host methods. This prevents certain properties such as class name from
* being modified by overriding
* {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)},
* as any changes will be overwritten by the host class.
* <p>
* Starting in {@link android.os.Build.VERSION_CODES#M API 23}, delegate
* methods are called <i>after</i> host methods, which all properties to be
* modified without being overwritten by the host class.
*/
public static class AccessibilityDelegate {
/**
* Sends an accessibility event of the given type. If accessibility is not
* enabled this method has no effect.
* <p>
* The default implementation behaves as {@link View#sendAccessibilityEvent(int)
* View#sendAccessibilityEvent(int)} for the case of no accessibility delegate
* been set.
* </p>
*
* @param host The View hosting the delegate.
* @param eventType The type of the event to send.
*
* @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int)
*/
public void sendAccessibilityEvent(View host, int eventType) {
host.sendAccessibilityEventInternal(eventType);
}
/**
* Performs the specified accessibility action on the view. For
* possible accessibility actions look at {@link AccessibilityNodeInfo}.
* <p>
* The default implementation behaves as
* {@link View#performAccessibilityAction(int, Bundle)
* View#performAccessibilityAction(int, Bundle)} for the case of
* no accessibility delegate been set.
* </p>
*
* @param action The action to perform.
* @return Whether the action was performed.
*
* @see View#performAccessibilityAction(int, Bundle)
* View#performAccessibilityAction(int, Bundle)
*/
public boolean performAccessibilityAction(View host, int action, Bundle args) {
return host.performAccessibilityActionInternal(action, args);
}
/**
* Sends an accessibility event. This method behaves exactly as
* {@link #sendAccessibilityEvent(View, int)} but takes as an argument an
* empty {@link AccessibilityEvent} and does not perform a check whether
* accessibility is enabled.
* <p>
* The default implementation behaves as
* {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent)
* View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for
* the case of no accessibility delegate been set.
* </p>
*
* @param host The View hosting the delegate.
* @param event The event to send.
*
* @see View#sendAccessibilityEventUnchecked(AccessibilityEvent)
* View#sendAccessibilityEventUnchecked(AccessibilityEvent)
*/
public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) {
host.sendAccessibilityEventUncheckedInternal(event);
}
/**
* Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then
* to its children for adding their text content to the event.
* <p>
* The default implementation behaves as
* {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
* View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for
* the case of no accessibility delegate been set.
* </p>
*
* @param host The View hosting the delegate.
* @param event The event.
* @return True if the event population was completed.
*
* @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
* View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
*/
public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
return host.dispatchPopulateAccessibilityEventInternal(event);
}
/**
* Gives a chance to the host View to populate the accessibility event with its
* text content.
* <p>
* The default implementation behaves as
* {@link View#onPopulateAccessibilityEvent(AccessibilityEvent)
* View#onPopulateAccessibilityEvent(AccessibilityEvent)} for
* the case of no accessibility delegate been set.
* </p>
*
* @param host The View hosting the delegate.
* @param event The accessibility event which to populate.
*
* @see View#onPopulateAccessibilityEvent(AccessibilityEvent)
* View#onPopulateAccessibilityEvent(AccessibilityEvent)
*/
public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
host.onPopulateAccessibilityEventInternal(event);
}
/**
* Initializes an {@link AccessibilityEvent} with information about the
* the host View which is the event source.
* <p>
* The default implementation behaves as
* {@link View#onInitializeAccessibilityEvent(AccessibilityEvent)
* View#onInitializeAccessibilityEvent(AccessibilityEvent)} for
* the case of no accessibility delegate been set.
* </p>
*
* @param host The View hosting the delegate.
* @param event The event to initialize.
*
* @see View#onInitializeAccessibilityEvent(AccessibilityEvent)
* View#onInitializeAccessibilityEvent(AccessibilityEvent)
*/
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
host.onInitializeAccessibilityEventInternal(event);
}
/**
* Initializes an {@link AccessibilityNodeInfo} with information about the host view.
* <p>
* The default implementation behaves as
* {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
* View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for
* the case of no accessibility delegate been set.
* </p>
*
* @param host The View hosting the delegate.
* @param info The instance to initialize.
*
* @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
* View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
*/
public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
host.onInitializeAccessibilityNodeInfoInternal(info);
}
/**
* Called when a child of the host View has requested sending an
* {@link AccessibilityEvent} and gives an opportunity to the parent (the host)
* to augment the event.
* <p>
* The default implementation behaves as
* {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
* ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for
* the case of no accessibility delegate been set.
* </p>
*
* @param host The View hosting the delegate.
* @param child The child which requests sending the event.
* @param event The event to be sent.
* @return True if the event should be sent
*
* @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
* ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)
*/
public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child,
AccessibilityEvent event) {
return host.onRequestSendAccessibilityEventInternal(child, event);
}
/**
* Gets the provider for managing a virtual view hierarchy rooted at this View
* and reported to {@link android.accessibilityservice.AccessibilityService}s
* that explore the window content.
* <p>
* The default implementation behaves as
* {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for
* the case of no accessibility delegate been set.
* </p>
*
* @return The provider.
*
* @see AccessibilityNodeProvider
*/
public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) {
return null;
}
/**
* Returns an {@link AccessibilityNodeInfo} representing the host view from the
* point of view of an {@link android.accessibilityservice.AccessibilityService}.
* This method is responsible for obtaining an accessibility node info from a
* pool of reusable instances and calling
* {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host
* view to initialize the former.
* <p>
* <strong>Note:</strong> The client is responsible for recycling the obtained
* instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object
* creation.
* </p>
* <p>
* The default implementation behaves as
* {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for
* the case of no accessibility delegate been set.
* </p>
* @return A populated {@link AccessibilityNodeInfo}.
*
* @see AccessibilityNodeInfo
*
* @hide
*/
public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) {
return host.createAccessibilityNodeInfoInternal();
}
}
private static class MatchIdPredicate implements Predicate<View> {
public int mId;
@Override
public boolean test(View view) {
return (view.mID == mId);
}
}
private static class MatchLabelForPredicate implements Predicate<View> {
private int mLabeledId;
@Override
public boolean test(View view) {
return (view.mLabelForId == mLabeledId);
}
}
private class SendViewStateChangedAccessibilityEvent implements Runnable {
private int mChangeTypes = 0;
private boolean mPosted;
private boolean mPostedWithDelay;
private long mLastEventTimeMillis;
@Override
public void run() {
mPosted = false;
mPostedWithDelay = false;
mLastEventTimeMillis = SystemClock.uptimeMillis();
if (AccessibilityManager.getInstance(mContext).isEnabled()) {
final AccessibilityEvent event = AccessibilityEvent.obtain();
event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
event.setContentChangeTypes(mChangeTypes);
sendAccessibilityEventUnchecked(event);
}
mChangeTypes = 0;
}
public void runOrPost(int changeType) {
mChangeTypes |= changeType;
// If this is a live region or the child of a live region, collect
// all events from this frame and send them on the next frame.
if (inLiveRegion()) {
// If we're already posted with a delay, remove that.
if (mPostedWithDelay) {
removeCallbacks(this);
mPostedWithDelay = false;
}
// Only post if we're not already posted.
if (!mPosted) {
post(this);
mPosted = true;
}
return;
}
if (mPosted) {
return;
}
final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis;
final long minEventIntevalMillis =
ViewConfiguration.getSendRecurringAccessibilityEventsInterval();
if (timeSinceLastMillis >= minEventIntevalMillis) {
removeCallbacks(this);
run();
} else {
postDelayed(this, minEventIntevalMillis - timeSinceLastMillis);
mPostedWithDelay = true;
}
}
}
private boolean inLiveRegion() {
if (getAccessibilityLiveRegion() != View.ACCESSIBILITY_LIVE_REGION_NONE) {
return true;
}
ViewParent parent = getParent();
while (parent instanceof View) {
if (((View) parent).getAccessibilityLiveRegion()
!= View.ACCESSIBILITY_LIVE_REGION_NONE) {
return true;
}
parent = parent.getParent();
}
return false;
}
/**
* Dump all private flags in readable format, useful for documentation and
* sanity checking.
*/
private static void dumpFlags() {
final HashMap<String, String> found = Maps.newHashMap();
try {
for (Field field : View.class.getDeclaredFields()) {
final int modifiers = field.getModifiers();
if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) {
if (field.getType().equals(int.class)) {
final int value = field.getInt(null);
dumpFlag(found, field.getName(), value);
} else if (field.getType().equals(int[].class)) {
final int[] values = (int[]) field.get(null);
for (int i = 0; i < values.length; i++) {
dumpFlag(found, field.getName() + "[" + i + "]", values[i]);
}
}
}
}
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
final ArrayList<String> keys = Lists.newArrayList();
keys.addAll(found.keySet());
Collections.sort(keys);
for (String key : keys) {
Log.d(VIEW_LOG_TAG, found.get(key));
}
}
private static void dumpFlag(HashMap<String, String> found, String name, int value) {
// Sort flags by prefix, then by bits, always keeping unique keys
final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' ');
final int prefix = name.indexOf('_');
final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name;
final String output = bits + " " + name;
found.put(key, output);
}
/** {@hide} */
public void encode(@NonNull ViewHierarchyEncoder stream) {
stream.beginObject(this);
encodeProperties(stream);
stream.endObject();
}
/** {@hide} */
@CallSuper
protected void encodeProperties(@NonNull ViewHierarchyEncoder stream) {
Object resolveId = ViewDebug.resolveId(getContext(), mID);
if (resolveId instanceof String) {
stream.addProperty("id", (String) resolveId);
} else {
stream.addProperty("id", mID);
}
stream.addProperty("misc:transformation.alpha",
mTransformationInfo != null ? mTransformationInfo.mAlpha : 0);
stream.addProperty("misc:transitionName", getTransitionName());
// layout
stream.addProperty("layout:left", mLeft);
stream.addProperty("layout:right", mRight);
stream.addProperty("layout:top", mTop);
stream.addProperty("layout:bottom", mBottom);
stream.addProperty("layout:width", getWidth());
stream.addProperty("layout:height", getHeight());
stream.addProperty("layout:layoutDirection", getLayoutDirection());
stream.addProperty("layout:layoutRtl", isLayoutRtl());
stream.addProperty("layout:hasTransientState", hasTransientState());
stream.addProperty("layout:baseline", getBaseline());
// layout params
ViewGroup.LayoutParams layoutParams = getLayoutParams();
if (layoutParams != null) {
stream.addPropertyKey("layoutParams");
layoutParams.encode(stream);
}
// scrolling
stream.addProperty("scrolling:scrollX", mScrollX);
stream.addProperty("scrolling:scrollY", mScrollY);
// padding
stream.addProperty("padding:paddingLeft", mPaddingLeft);
stream.addProperty("padding:paddingRight", mPaddingRight);
stream.addProperty("padding:paddingTop", mPaddingTop);
stream.addProperty("padding:paddingBottom", mPaddingBottom);
stream.addProperty("padding:userPaddingRight", mUserPaddingRight);
stream.addProperty("padding:userPaddingLeft", mUserPaddingLeft);
stream.addProperty("padding:userPaddingBottom", mUserPaddingBottom);
stream.addProperty("padding:userPaddingStart", mUserPaddingStart);
stream.addProperty("padding:userPaddingEnd", mUserPaddingEnd);
// measurement
stream.addProperty("measurement:minHeight", mMinHeight);
stream.addProperty("measurement:minWidth", mMinWidth);
stream.addProperty("measurement:measuredWidth", mMeasuredWidth);
stream.addProperty("measurement:measuredHeight", mMeasuredHeight);
// drawing
stream.addProperty("drawing:elevation", getElevation());
stream.addProperty("drawing:translationX", getTranslationX());
stream.addProperty("drawing:translationY", getTranslationY());
stream.addProperty("drawing:translationZ", getTranslationZ());
stream.addProperty("drawing:rotation", getRotation());
stream.addProperty("drawing:rotationX", getRotationX());
stream.addProperty("drawing:rotationY", getRotationY());
stream.addProperty("drawing:scaleX", getScaleX());
stream.addProperty("drawing:scaleY", getScaleY());
stream.addProperty("drawing:pivotX", getPivotX());
stream.addProperty("drawing:pivotY", getPivotY());
stream.addProperty("drawing:opaque", isOpaque());
stream.addProperty("drawing:alpha", getAlpha());
stream.addProperty("drawing:transitionAlpha", getTransitionAlpha());
stream.addProperty("drawing:shadow", hasShadow());
stream.addProperty("drawing:solidColor", getSolidColor());
stream.addProperty("drawing:layerType", mLayerType);
stream.addProperty("drawing:willNotDraw", willNotDraw());
stream.addProperty("drawing:hardwareAccelerated", isHardwareAccelerated());
stream.addProperty("drawing:willNotCacheDrawing", willNotCacheDrawing());
stream.addProperty("drawing:drawingCacheEnabled", isDrawingCacheEnabled());
stream.addProperty("drawing:overlappingRendering", hasOverlappingRendering());
// focus
stream.addProperty("focus:hasFocus", hasFocus());
stream.addProperty("focus:isFocused", isFocused());
stream.addProperty("focus:isFocusable", isFocusable());
stream.addProperty("focus:isFocusableInTouchMode", isFocusableInTouchMode());
stream.addProperty("misc:clickable", isClickable());
stream.addProperty("misc:pressed", isPressed());
stream.addProperty("misc:selected", isSelected());
stream.addProperty("misc:touchMode", isInTouchMode());
stream.addProperty("misc:hovered", isHovered());
stream.addProperty("misc:activated", isActivated());
stream.addProperty("misc:visibility", getVisibility());
stream.addProperty("misc:fitsSystemWindows", getFitsSystemWindows());
stream.addProperty("misc:filterTouchesWhenObscured", getFilterTouchesWhenObscured());
stream.addProperty("misc:enabled", isEnabled());
stream.addProperty("misc:soundEffectsEnabled", isSoundEffectsEnabled());
stream.addProperty("misc:hapticFeedbackEnabled", isHapticFeedbackEnabled());
// theme attributes
Resources.Theme theme = getContext().getTheme();
if (theme != null) {
stream.addPropertyKey("theme");
theme.encode(stream);
}
// view attribute information
int n = mAttributes != null ? mAttributes.length : 0;
stream.addProperty("meta:__attrCount__", n/2);
for (int i = 0; i < n; i += 2) {
stream.addProperty("meta:__attr__" + mAttributes[i], mAttributes[i+1]);
}
stream.addProperty("misc:scrollBarStyle", getScrollBarStyle());
// text
stream.addProperty("text:textDirection", getTextDirection());
stream.addProperty("text:textAlignment", getTextAlignment());
// accessibility
CharSequence contentDescription = getContentDescription();
stream.addProperty("accessibility:contentDescription",
contentDescription == null ? "" : contentDescription.toString());
stream.addProperty("accessibility:labelFor", getLabelFor());
stream.addProperty("accessibility:importantForAccessibility", getImportantForAccessibility());
}
/**
* Determine if this view is rendered on a round wearable device and is the main view
* on the screen.
*/
boolean shouldDrawRoundScrollbar() {
if (!mResources.getConfiguration().isScreenRound() || mAttachInfo == null) {
return false;
}
final View rootView = getRootView();
final WindowInsets insets = getRootWindowInsets();
int height = getHeight();
int width = getWidth();
int displayHeight = rootView.getHeight();
int displayWidth = rootView.getWidth();
if (height != displayHeight || width != displayWidth) {
return false;
}
getLocationInWindow(mAttachInfo.mTmpLocation);
return mAttachInfo.mTmpLocation[0] == insets.getStableInsetLeft()
&& mAttachInfo.mTmpLocation[1] == insets.getStableInsetTop();
}
}