/*
* Copyright (C) 2010 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.widget;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.database.DataSetObserver;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.SystemClock;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.IntProperty;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.View.OnTouchListener;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.WindowManager;
import android.view.animation.AccelerateDecelerateInterpolator;
import com.android.internal.R;
import com.android.internal.widget.AutoScrollHelper.AbsListViewAutoScroller;
import java.util.Locale;
/**
* A ListPopupWindow anchors itself to a host view and displays a
* list of choices.
*
* <p>ListPopupWindow contains a number of tricky behaviors surrounding
* positioning, scrolling parents to fit the dropdown, interacting
* sanely with the IME if present, and others.
*
* @see android.widget.AutoCompleteTextView
* @see android.widget.Spinner
*/
public class ListPopupWindow {
private static final String TAG = "ListPopupWindow";
private static final boolean DEBUG = false;
/**
* This value controls the length of time that the user
* must leave a pointer down without scrolling to expand
* the autocomplete dropdown list to cover the IME.
*/
private static final int EXPAND_LIST_TIMEOUT = 250;
private Context mContext;
private PopupWindow mPopup;
private ListAdapter mAdapter;
private DropDownListView mDropDownList;
private int mDropDownHeight = ViewGroup.LayoutParams.WRAP_CONTENT;
private int mDropDownWidth = ViewGroup.LayoutParams.WRAP_CONTENT;
private int mDropDownHorizontalOffset;
private int mDropDownVerticalOffset;
private int mDropDownWindowLayoutType = WindowManager.LayoutParams.TYPE_APPLICATION_SUB_PANEL;
private boolean mDropDownVerticalOffsetSet;
private int mDropDownGravity = Gravity.NO_GRAVITY;
private boolean mDropDownAlwaysVisible = false;
private boolean mForceIgnoreOutsideTouch = false;
int mListItemExpandMaximum = Integer.MAX_VALUE;
private View mPromptView;
private int mPromptPosition = POSITION_PROMPT_ABOVE;
private DataSetObserver mObserver;
private View mDropDownAnchorView;
private Drawable mDropDownListHighlight;
private AdapterView.OnItemClickListener mItemClickListener;
private AdapterView.OnItemSelectedListener mItemSelectedListener;
private final ResizePopupRunnable mResizePopupRunnable = new ResizePopupRunnable();
private final PopupTouchInterceptor mTouchInterceptor = new PopupTouchInterceptor();
private final PopupScrollListener mScrollListener = new PopupScrollListener();
private final ListSelectorHider mHideSelector = new ListSelectorHider();
private Runnable mShowDropDownRunnable;
private final Handler mHandler;
private Rect mTempRect = new Rect();
private boolean mModal;
private int mLayoutDirection;
/**
* The provided prompt view should appear above list content.
*
* @see #setPromptPosition(int)
* @see #getPromptPosition()
* @see #setPromptView(View)
*/
public static final int POSITION_PROMPT_ABOVE = 0;
/**
* The provided prompt view should appear below list content.
*
* @see #setPromptPosition(int)
* @see #getPromptPosition()
* @see #setPromptView(View)
*/
public static final int POSITION_PROMPT_BELOW = 1;
/**
* Alias for {@link ViewGroup.LayoutParams#MATCH_PARENT}.
* If used to specify a popup width, the popup will match the width of the anchor view.
* If used to specify a popup height, the popup will fill available space.
*/
public static final int MATCH_PARENT = ViewGroup.LayoutParams.MATCH_PARENT;
/**
* Alias for {@link ViewGroup.LayoutParams#WRAP_CONTENT}.
* If used to specify a popup width, the popup will use the width of its content.
*/
public static final int WRAP_CONTENT = ViewGroup.LayoutParams.WRAP_CONTENT;
/**
* Mode for {@link #setInputMethodMode(int)}: the requirements for the
* input method should be based on the focusability of the popup. That is
* if it is focusable than it needs to work with the input method, else
* it doesn't.
*/
public static final int INPUT_METHOD_FROM_FOCUSABLE = PopupWindow.INPUT_METHOD_FROM_FOCUSABLE;
/**
* Mode for {@link #setInputMethodMode(int)}: this popup always needs to
* work with an input method, regardless of whether it is focusable. This
* means that it will always be displayed so that the user can also operate
* the input method while it is shown.
*/
public static final int INPUT_METHOD_NEEDED = PopupWindow.INPUT_METHOD_NEEDED;
/**
* Mode for {@link #setInputMethodMode(int)}: this popup never needs to
* work with an input method, regardless of whether it is focusable. This
* means that it will always be displayed to use as much space on the
* screen as needed, regardless of whether this covers the input method.
*/
public static final int INPUT_METHOD_NOT_NEEDED = PopupWindow.INPUT_METHOD_NOT_NEEDED;
/**
* Create a new, empty popup window capable of displaying items from a ListAdapter.
* Backgrounds should be set using {@link #setBackgroundDrawable(Drawable)}.
*
* @param context Context used for contained views.
*/
public ListPopupWindow(Context context) {
this(context, null, com.android.internal.R.attr.listPopupWindowStyle, 0);
}
/**
* Create a new, empty popup window capable of displaying items from a ListAdapter.
* Backgrounds should be set using {@link #setBackgroundDrawable(Drawable)}.
*
* @param context Context used for contained views.
* @param attrs Attributes from inflating parent views used to style the popup.
*/
public ListPopupWindow(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.listPopupWindowStyle, 0);
}
/**
* Create a new, empty popup window capable of displaying items from a ListAdapter.
* Backgrounds should be set using {@link #setBackgroundDrawable(Drawable)}.
*
* @param context Context used for contained views.
* @param attrs Attributes from inflating parent views used to style the popup.
* @param defStyleAttr Default style attribute to use for popup content.
*/
public ListPopupWindow(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
/**
* Create a new, empty popup window capable of displaying items from a ListAdapter.
* Backgrounds should be set using {@link #setBackgroundDrawable(Drawable)}.
*
* @param context Context used for contained views.
* @param attrs Attributes from inflating parent views used to style the popup.
* @param defStyleAttr Style attribute to read for default styling of popup content.
* @param defStyleRes Style resource ID to use for default styling of popup content.
*/
public ListPopupWindow(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
mContext = context;
mHandler = new Handler(context.getMainLooper());
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ListPopupWindow,
defStyleAttr, defStyleRes);
mDropDownHorizontalOffset = a.getDimensionPixelOffset(
R.styleable.ListPopupWindow_dropDownHorizontalOffset, 0);
mDropDownVerticalOffset = a.getDimensionPixelOffset(
R.styleable.ListPopupWindow_dropDownVerticalOffset, 0);
if (mDropDownVerticalOffset != 0) {
mDropDownVerticalOffsetSet = true;
}
a.recycle();
mPopup = new PopupWindow(context, attrs, defStyleAttr, defStyleRes);
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
// Set the default layout direction to match the default locale one
final Locale locale = mContext.getResources().getConfiguration().locale;
mLayoutDirection = TextUtils.getLayoutDirectionFromLocale(locale);
}
/**
* Sets the adapter that provides the data and the views to represent the data
* in this popup window.
*
* @param adapter The adapter to use to create this window's content.
*/
public void setAdapter(ListAdapter adapter) {
if (mObserver == null) {
mObserver = new PopupDataSetObserver();
} else if (mAdapter != null) {
mAdapter.unregisterDataSetObserver(mObserver);
}
mAdapter = adapter;
if (mAdapter != null) {
adapter.registerDataSetObserver(mObserver);
}
if (mDropDownList != null) {
mDropDownList.setAdapter(mAdapter);
}
}
/**
* Set where the optional prompt view should appear. The default is
* {@link #POSITION_PROMPT_ABOVE}.
*
* @param position A position constant declaring where the prompt should be displayed.
*
* @see #POSITION_PROMPT_ABOVE
* @see #POSITION_PROMPT_BELOW
*/
public void setPromptPosition(int position) {
mPromptPosition = position;
}
/**
* @return Where the optional prompt view should appear.
*
* @see #POSITION_PROMPT_ABOVE
* @see #POSITION_PROMPT_BELOW
*/
public int getPromptPosition() {
return mPromptPosition;
}
/**
* Set whether this window should be modal when shown.
*
* <p>If a popup window is modal, it will receive all touch and key input.
* If the user touches outside the popup window's content area the popup window
* will be dismissed.
*
* @param modal {@code true} if the popup window should be modal, {@code false} otherwise.
*/
public void setModal(boolean modal) {
mModal = modal;
mPopup.setFocusable(modal);
}
/**
* Returns whether the popup window will be modal when shown.
*
* @return {@code true} if the popup window will be modal, {@code false} otherwise.
*/
public boolean isModal() {
return mModal;
}
/**
* Forces outside touches to be ignored. Normally if {@link #isDropDownAlwaysVisible()} is
* false, we allow outside touch to dismiss the dropdown. If this is set to true, then we
* ignore outside touch even when the drop down is not set to always visible.
*
* @hide Used only by AutoCompleteTextView to handle some internal special cases.
*/
public void setForceIgnoreOutsideTouch(boolean forceIgnoreOutsideTouch) {
mForceIgnoreOutsideTouch = forceIgnoreOutsideTouch;
}
/**
* Sets whether the drop-down should remain visible under certain conditions.
*
* The drop-down will occupy the entire screen below {@link #getAnchorView} regardless
* of the size or content of the list. {@link #getBackground()} will fill any space
* that is not used by the list.
*
* @param dropDownAlwaysVisible Whether to keep the drop-down visible.
*
* @hide Only used by AutoCompleteTextView under special conditions.
*/
public void setDropDownAlwaysVisible(boolean dropDownAlwaysVisible) {
mDropDownAlwaysVisible = dropDownAlwaysVisible;
}
/**
* @return Whether the drop-down is visible under special conditions.
*
* @hide Only used by AutoCompleteTextView under special conditions.
*/
public boolean isDropDownAlwaysVisible() {
return mDropDownAlwaysVisible;
}
/**
* Sets the operating mode for the soft input area.
*
* @param mode The desired mode, see
* {@link android.view.WindowManager.LayoutParams#softInputMode}
* for the full list
*
* @see android.view.WindowManager.LayoutParams#softInputMode
* @see #getSoftInputMode()
*/
public void setSoftInputMode(int mode) {
mPopup.setSoftInputMode(mode);
}
/**
* Returns the current value in {@link #setSoftInputMode(int)}.
*
* @see #setSoftInputMode(int)
* @see android.view.WindowManager.LayoutParams#softInputMode
*/
public int getSoftInputMode() {
return mPopup.getSoftInputMode();
}
/**
* Sets a drawable to use as the list item selector.
*
* @param selector List selector drawable to use in the popup.
*/
public void setListSelector(Drawable selector) {
mDropDownListHighlight = selector;
}
/**
* @return The background drawable for the popup window.
*/
public Drawable getBackground() {
return mPopup.getBackground();
}
/**
* Sets a drawable to be the background for the popup window.
*
* @param d A drawable to set as the background.
*/
public void setBackgroundDrawable(Drawable d) {
mPopup.setBackgroundDrawable(d);
}
/**
* Set an animation style to use when the popup window is shown or dismissed.
*
* @param animationStyle Animation style to use.
*/
public void setAnimationStyle(int animationStyle) {
mPopup.setAnimationStyle(animationStyle);
}
/**
* Returns the animation style that will be used when the popup window is
* shown or dismissed.
*
* @return Animation style that will be used.
*/
public int getAnimationStyle() {
return mPopup.getAnimationStyle();
}
/**
* Returns the view that will be used to anchor this popup.
*
* @return The popup's anchor view
*/
public View getAnchorView() {
return mDropDownAnchorView;
}
/**
* Sets the popup's anchor view. This popup will always be positioned relative to
* the anchor view when shown.
*
* @param anchor The view to use as an anchor.
*/
public void setAnchorView(View anchor) {
mDropDownAnchorView = anchor;
}
/**
* @return The horizontal offset of the popup from its anchor in pixels.
*/
public int getHorizontalOffset() {
return mDropDownHorizontalOffset;
}
/**
* Set the horizontal offset of this popup from its anchor view in pixels.
*
* @param offset The horizontal offset of the popup from its anchor.
*/
public void setHorizontalOffset(int offset) {
mDropDownHorizontalOffset = offset;
}
/**
* @return The vertical offset of the popup from its anchor in pixels.
*/
public int getVerticalOffset() {
if (!mDropDownVerticalOffsetSet) {
return 0;
}
return mDropDownVerticalOffset;
}
/**
* Set the vertical offset of this popup from its anchor view in pixels.
*
* @param offset The vertical offset of the popup from its anchor.
*/
public void setVerticalOffset(int offset) {
mDropDownVerticalOffset = offset;
mDropDownVerticalOffsetSet = true;
}
/**
* Set the gravity of the dropdown list. This is commonly used to
* set gravity to START or END for alignment with the anchor.
*
* @param gravity Gravity value to use
*/
public void setDropDownGravity(int gravity) {
mDropDownGravity = gravity;
}
/**
* @return The width of the popup window in pixels.
*/
public int getWidth() {
return mDropDownWidth;
}
/**
* Sets the width of the popup window in pixels. Can also be {@link #MATCH_PARENT}
* or {@link #WRAP_CONTENT}.
*
* @param width Width of the popup window.
*/
public void setWidth(int width) {
mDropDownWidth = width;
}
/**
* Sets the width of the popup window by the size of its content. The final width may be
* larger to accommodate styled window dressing.
*
* @param width Desired width of content in pixels.
*/
public void setContentWidth(int width) {
Drawable popupBackground = mPopup.getBackground();
if (popupBackground != null) {
popupBackground.getPadding(mTempRect);
mDropDownWidth = mTempRect.left + mTempRect.right + width;
} else {
setWidth(width);
}
}
/**
* @return The height of the popup window in pixels.
*/
public int getHeight() {
return mDropDownHeight;
}
/**
* Sets the height of the popup window in pixels. Can also be {@link #MATCH_PARENT}.
*
* @param height Height of the popup window.
*/
public void setHeight(int height) {
mDropDownHeight = height;
}
/**
* Set the layout type for this popup window.
* <p>
* See {@link WindowManager.LayoutParams#type} for possible values.
*
* @param layoutType Layout type for this window.
*
* @see WindowManager.LayoutParams#type
*/
public void setWindowLayoutType(int layoutType) {
mDropDownWindowLayoutType = layoutType;
}
/**
* Sets a listener to receive events when a list item is clicked.
*
* @param clickListener Listener to register
*
* @see ListView#setOnItemClickListener(android.widget.AdapterView.OnItemClickListener)
*/
public void setOnItemClickListener(AdapterView.OnItemClickListener clickListener) {
mItemClickListener = clickListener;
}
/**
* Sets a listener to receive events when a list item is selected.
*
* @param selectedListener Listener to register.
*
* @see ListView#setOnItemSelectedListener(android.widget.AdapterView.OnItemSelectedListener)
*/
public void setOnItemSelectedListener(AdapterView.OnItemSelectedListener selectedListener) {
mItemSelectedListener = selectedListener;
}
/**
* Set a view to act as a user prompt for this popup window. Where the prompt view will appear
* is controlled by {@link #setPromptPosition(int)}.
*
* @param prompt View to use as an informational prompt.
*/
public void setPromptView(View prompt) {
boolean showing = isShowing();
if (showing) {
removePromptView();
}
mPromptView = prompt;
if (showing) {
show();
}
}
/**
* Post a {@link #show()} call to the UI thread.
*/
public void postShow() {
mHandler.post(mShowDropDownRunnable);
}
/**
* Show the popup list. If the list is already showing, this method
* will recalculate the popup's size and position.
*/
public void show() {
int height = buildDropDown();
final boolean noInputMethod = isInputMethodNotNeeded();
mPopup.setAllowScrollingAnchorParent(!noInputMethod);
mPopup.setWindowLayoutType(mDropDownWindowLayoutType);
if (mPopup.isShowing()) {
final int widthSpec;
if (mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT) {
// The call to PopupWindow's update method below can accept -1 for any
// value you do not want to update.
widthSpec = -1;
} else if (mDropDownWidth == ViewGroup.LayoutParams.WRAP_CONTENT) {
widthSpec = getAnchorView().getWidth();
} else {
widthSpec = mDropDownWidth;
}
final int heightSpec;
if (mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) {
// The call to PopupWindow's update method below can accept -1 for any
// value you do not want to update.
heightSpec = noInputMethod ? height : ViewGroup.LayoutParams.MATCH_PARENT;
if (noInputMethod) {
mPopup.setWidth(mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT ?
ViewGroup.LayoutParams.MATCH_PARENT : 0);
mPopup.setHeight(0);
} else {
mPopup.setWidth(mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT ?
ViewGroup.LayoutParams.MATCH_PARENT : 0);
mPopup.setHeight(ViewGroup.LayoutParams.MATCH_PARENT);
}
} else if (mDropDownHeight == ViewGroup.LayoutParams.WRAP_CONTENT) {
heightSpec = height;
} else {
heightSpec = mDropDownHeight;
}
mPopup.setOutsideTouchable(!mForceIgnoreOutsideTouch && !mDropDownAlwaysVisible);
mPopup.update(getAnchorView(), mDropDownHorizontalOffset,
mDropDownVerticalOffset, (widthSpec < 0)? -1 : widthSpec,
(heightSpec < 0)? -1 : heightSpec);
} else {
final int widthSpec;
if (mDropDownWidth == ViewGroup.LayoutParams.MATCH_PARENT) {
widthSpec = ViewGroup.LayoutParams.MATCH_PARENT;
} else {
if (mDropDownWidth == ViewGroup.LayoutParams.WRAP_CONTENT) {
widthSpec = getAnchorView().getWidth();
} else {
widthSpec = mDropDownWidth;
}
}
final int heightSpec;
if (mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) {
heightSpec = ViewGroup.LayoutParams.MATCH_PARENT;
} else {
if (mDropDownHeight == ViewGroup.LayoutParams.WRAP_CONTENT) {
heightSpec = height;
} else {
heightSpec = mDropDownHeight;
}
}
mPopup.setWidth(widthSpec);
mPopup.setHeight(heightSpec);
mPopup.setClipToScreenEnabled(true);
// use outside touchable to dismiss drop down when touching outside of it, so
// only set this if the dropdown is not always visible
mPopup.setOutsideTouchable(!mForceIgnoreOutsideTouch && !mDropDownAlwaysVisible);
mPopup.setTouchInterceptor(mTouchInterceptor);
mPopup.showAsDropDown(getAnchorView(), mDropDownHorizontalOffset,
mDropDownVerticalOffset, mDropDownGravity);
mDropDownList.setSelection(ListView.INVALID_POSITION);
if (!mModal || mDropDownList.isInTouchMode()) {
clearListSelection();
}
if (!mModal) {
mHandler.post(mHideSelector);
}
}
}
/**
* Dismiss the popup window.
*/
public void dismiss() {
mPopup.dismiss();
removePromptView();
mPopup.setContentView(null);
mDropDownList = null;
mHandler.removeCallbacks(mResizePopupRunnable);
}
/**
* Set a listener to receive a callback when the popup is dismissed.
*
* @param listener Listener that will be notified when the popup is dismissed.
*/
public void setOnDismissListener(PopupWindow.OnDismissListener listener) {
mPopup.setOnDismissListener(listener);
}
private void removePromptView() {
if (mPromptView != null) {
final ViewParent parent = mPromptView.getParent();
if (parent instanceof ViewGroup) {
final ViewGroup group = (ViewGroup) parent;
group.removeView(mPromptView);
}
}
}
/**
* Control how the popup operates with an input method: one of
* {@link #INPUT_METHOD_FROM_FOCUSABLE}, {@link #INPUT_METHOD_NEEDED},
* or {@link #INPUT_METHOD_NOT_NEEDED}.
*
* <p>If the popup is showing, calling this method will take effect only
* the next time the popup is shown or through a manual call to the {@link #show()}
* method.</p>
*
* @see #getInputMethodMode()
* @see #show()
*/
public void setInputMethodMode(int mode) {
mPopup.setInputMethodMode(mode);
}
/**
* Return the current value in {@link #setInputMethodMode(int)}.
*
* @see #setInputMethodMode(int)
*/
public int getInputMethodMode() {
return mPopup.getInputMethodMode();
}
/**
* Set the selected position of the list.
* Only valid when {@link #isShowing()} == {@code true}.
*
* @param position List position to set as selected.
*/
public void setSelection(int position) {
DropDownListView list = mDropDownList;
if (isShowing() && list != null) {
list.mListSelectionHidden = false;
list.setSelection(position);
if (list.getChoiceMode() != ListView.CHOICE_MODE_NONE) {
list.setItemChecked(position, true);
}
}
}
/**
* Clear any current list selection.
* Only valid when {@link #isShowing()} == {@code true}.
*/
public void clearListSelection() {
final DropDownListView list = mDropDownList;
if (list != null) {
// WARNING: Please read the comment where mListSelectionHidden is declared
list.mListSelectionHidden = true;
list.hideSelector();
list.requestLayout();
}
}
/**
* @return {@code true} if the popup is currently showing, {@code false} otherwise.
*/
public boolean isShowing() {
return mPopup.isShowing();
}
/**
* @return {@code true} if this popup is configured to assume the user does not need
* to interact with the IME while it is showing, {@code false} otherwise.
*/
public boolean isInputMethodNotNeeded() {
return mPopup.getInputMethodMode() == INPUT_METHOD_NOT_NEEDED;
}
/**
* Perform an item click operation on the specified list adapter position.
*
* @param position Adapter position for performing the click
* @return true if the click action could be performed, false if not.
* (e.g. if the popup was not showing, this method would return false.)
*/
public boolean performItemClick(int position) {
if (isShowing()) {
if (mItemClickListener != null) {
final DropDownListView list = mDropDownList;
final View child = list.getChildAt(position - list.getFirstVisiblePosition());
final ListAdapter adapter = list.getAdapter();
mItemClickListener.onItemClick(list, child, position, adapter.getItemId(position));
}
return true;
}
return false;
}
/**
* @return The currently selected item or null if the popup is not showing.
*/
public Object getSelectedItem() {
if (!isShowing()) {
return null;
}
return mDropDownList.getSelectedItem();
}
/**
* @return The position of the currently selected item or {@link ListView#INVALID_POSITION}
* if {@link #isShowing()} == {@code false}.
*
* @see ListView#getSelectedItemPosition()
*/
public int getSelectedItemPosition() {
if (!isShowing()) {
return ListView.INVALID_POSITION;
}
return mDropDownList.getSelectedItemPosition();
}
/**
* @return The ID of the currently selected item or {@link ListView#INVALID_ROW_ID}
* if {@link #isShowing()} == {@code false}.
*
* @see ListView#getSelectedItemId()
*/
public long getSelectedItemId() {
if (!isShowing()) {
return ListView.INVALID_ROW_ID;
}
return mDropDownList.getSelectedItemId();
}
/**
* @return The View for the currently selected item or null if
* {@link #isShowing()} == {@code false}.
*
* @see ListView#getSelectedView()
*/
public View getSelectedView() {
if (!isShowing()) {
return null;
}
return mDropDownList.getSelectedView();
}
/**
* @return The {@link ListView} displayed within the popup window.
* Only valid when {@link #isShowing()} == {@code true}.
*/
public ListView getListView() {
return mDropDownList;
}
/**
* The maximum number of list items that can be visible and still have
* the list expand when touched.
*
* @param max Max number of items that can be visible and still allow the list to expand.
*/
void setListItemExpandMax(int max) {
mListItemExpandMaximum = max;
}
/**
* Filter key down events. By forwarding key down events to this function,
* views using non-modal ListPopupWindow can have it handle key selection of items.
*
* @param keyCode keyCode param passed to the host view's onKeyDown
* @param event event param passed to the host view's onKeyDown
* @return true if the event was handled, false if it was ignored.
*
* @see #setModal(boolean)
*/
public boolean onKeyDown(int keyCode, KeyEvent event) {
// when the drop down is shown, we drive it directly
if (isShowing()) {
// the key events are forwarded to the list in the drop down view
// note that ListView handles space but we don't want that to happen
// also if selection is not currently in the drop down, then don't
// let center or enter presses go there since that would cause it
// to select one of its items
if (keyCode != KeyEvent.KEYCODE_SPACE
&& (mDropDownList.getSelectedItemPosition() >= 0
|| !KeyEvent.isConfirmKey(keyCode))) {
int curIndex = mDropDownList.getSelectedItemPosition();
boolean consumed;
final boolean below = !mPopup.isAboveAnchor();
final ListAdapter adapter = mAdapter;
boolean allEnabled;
int firstItem = Integer.MAX_VALUE;
int lastItem = Integer.MIN_VALUE;
if (adapter != null) {
allEnabled = adapter.areAllItemsEnabled();
firstItem = allEnabled ? 0 :
mDropDownList.lookForSelectablePosition(0, true);
lastItem = allEnabled ? adapter.getCount() - 1 :
mDropDownList.lookForSelectablePosition(adapter.getCount() - 1, false);
}
if ((below && keyCode == KeyEvent.KEYCODE_DPAD_UP && curIndex <= firstItem) ||
(!below && keyCode == KeyEvent.KEYCODE_DPAD_DOWN && curIndex >= lastItem)) {
// When the selection is at the top, we block the key
// event to prevent focus from moving.
clearListSelection();
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
show();
return true;
} else {
// WARNING: Please read the comment where mListSelectionHidden
// is declared
mDropDownList.mListSelectionHidden = false;
}
consumed = mDropDownList.onKeyDown(keyCode, event);
if (DEBUG) Log.v(TAG, "Key down: code=" + keyCode + " list consumed=" + consumed);
if (consumed) {
// If it handled the key event, then the user is
// navigating in the list, so we should put it in front.
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
// Here's a little trick we need to do to make sure that
// the list view is actually showing its focus indicator,
// by ensuring it has focus and getting its window out
// of touch mode.
mDropDownList.requestFocusFromTouch();
show();
switch (keyCode) {
// avoid passing the focus from the text view to the
// next component
case KeyEvent.KEYCODE_ENTER:
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_UP:
return true;
}
} else {
if (below && keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
// when the selection is at the bottom, we block the
// event to avoid going to the next focusable widget
if (curIndex == lastItem) {
return true;
}
} else if (!below && keyCode == KeyEvent.KEYCODE_DPAD_UP &&
curIndex == firstItem) {
return true;
}
}
}
}
return false;
}
/**
* Filter key down events. By forwarding key up events to this function,
* views using non-modal ListPopupWindow can have it handle key selection of items.
*
* @param keyCode keyCode param passed to the host view's onKeyUp
* @param event event param passed to the host view's onKeyUp
* @return true if the event was handled, false if it was ignored.
*
* @see #setModal(boolean)
*/
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (isShowing() && mDropDownList.getSelectedItemPosition() >= 0) {
boolean consumed = mDropDownList.onKeyUp(keyCode, event);
if (consumed && KeyEvent.isConfirmKey(keyCode)) {
// if the list accepts the key events and the key event was a click, the text view
// gets the selected item from the drop down as its content
dismiss();
}
return consumed;
}
return false;
}
/**
* Filter pre-IME key events. By forwarding {@link View#onKeyPreIme(int, KeyEvent)}
* events to this function, views using ListPopupWindow can have it dismiss the popup
* when the back key is pressed.
*
* @param keyCode keyCode param passed to the host view's onKeyPreIme
* @param event event param passed to the host view's onKeyPreIme
* @return true if the event was handled, false if it was ignored.
*
* @see #setModal(boolean)
*/
public boolean onKeyPreIme(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && isShowing()) {
// special case for the back key, we do not even try to send it
// to the drop down list but instead, consume it immediately
final View anchorView = mDropDownAnchorView;
if (event.getAction() == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0) {
KeyEvent.DispatcherState state = anchorView.getKeyDispatcherState();
if (state != null) {
state.startTracking(event, this);
}
return true;
} else if (event.getAction() == KeyEvent.ACTION_UP) {
KeyEvent.DispatcherState state = anchorView.getKeyDispatcherState();
if (state != null) {
state.handleUpEvent(event);
}
if (event.isTracking() && !event.isCanceled()) {
dismiss();
return true;
}
}
}
return false;
}
/**
* Returns an {@link OnTouchListener} that can be added to the source view
* to implement drag-to-open behavior. Generally, the source view should be
* the same view that was passed to {@link #setAnchorView}.
* <p>
* When the listener is set on a view, touching that view and dragging
* outside of its bounds will open the popup window. Lifting will select the
* currently touched list item.
* <p>
* Example usage:
* <pre>
* ListPopupWindow myPopup = new ListPopupWindow(context);
* myPopup.setAnchor(myAnchor);
* OnTouchListener dragListener = myPopup.createDragToOpenListener(myAnchor);
* myAnchor.setOnTouchListener(dragListener);
* </pre>
*
* @param src the view on which the resulting listener will be set
* @return a touch listener that controls drag-to-open behavior
*/
public OnTouchListener createDragToOpenListener(View src) {
return new ForwardingListener(src) {
@Override
public ListPopupWindow getPopup() {
return ListPopupWindow.this;
}
};
}
/**
* <p>Builds the popup window's content and returns the height the popup
* should have. Returns -1 when the content already exists.</p>
*
* @return the content's height or -1 if content already exists
*/
private int buildDropDown() {
ViewGroup dropDownView;
int otherHeights = 0;
if (mDropDownList == null) {
Context context = mContext;
/**
* This Runnable exists for the sole purpose of checking if the view layout has got
* completed and if so call showDropDown to display the drop down. This is used to show
* the drop down as soon as possible after user opens up the search dialog, without
* waiting for the normal UI pipeline to do it's job which is slower than this method.
*/
mShowDropDownRunnable = new Runnable() {
public void run() {
// View layout should be all done before displaying the drop down.
View view = getAnchorView();
if (view != null && view.getWindowToken() != null) {
show();
}
}
};
mDropDownList = new DropDownListView(context, !mModal);
if (mDropDownListHighlight != null) {
mDropDownList.setSelector(mDropDownListHighlight);
}
mDropDownList.setAdapter(mAdapter);
mDropDownList.setOnItemClickListener(mItemClickListener);
mDropDownList.setFocusable(true);
mDropDownList.setFocusableInTouchMode(true);
mDropDownList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
if (position != -1) {
DropDownListView dropDownList = mDropDownList;
if (dropDownList != null) {
dropDownList.mListSelectionHidden = false;
}
}
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
mDropDownList.setOnScrollListener(mScrollListener);
if (mItemSelectedListener != null) {
mDropDownList.setOnItemSelectedListener(mItemSelectedListener);
}
dropDownView = mDropDownList;
View hintView = mPromptView;
if (hintView != null) {
// if a hint has been specified, we accomodate more space for it and
// add a text view in the drop down menu, at the bottom of the list
LinearLayout hintContainer = new LinearLayout(context);
hintContainer.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams hintParams = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, 0, 1.0f
);
switch (mPromptPosition) {
case POSITION_PROMPT_BELOW:
hintContainer.addView(dropDownView, hintParams);
hintContainer.addView(hintView);
break;
case POSITION_PROMPT_ABOVE:
hintContainer.addView(hintView);
hintContainer.addView(dropDownView, hintParams);
break;
default:
Log.e(TAG, "Invalid hint position " + mPromptPosition);
break;
}
// Measure the hint's height to find how much more vertical
// space we need to add to the drop down's height.
final int widthSize;
final int widthMode;
if (mDropDownWidth >= 0) {
widthMode = MeasureSpec.AT_MOST;
widthSize = mDropDownWidth;
} else {
widthMode = MeasureSpec.UNSPECIFIED;
widthSize = 0;
}
final int widthSpec = MeasureSpec.makeMeasureSpec(widthSize, widthMode);
final int heightSpec = MeasureSpec.UNSPECIFIED;
hintView.measure(widthSpec, heightSpec);
hintParams = (LinearLayout.LayoutParams) hintView.getLayoutParams();
otherHeights = hintView.getMeasuredHeight() + hintParams.topMargin
+ hintParams.bottomMargin;
dropDownView = hintContainer;
}
mPopup.setContentView(dropDownView);
} else {
dropDownView = (ViewGroup) mPopup.getContentView();
final View view = mPromptView;
if (view != null) {
LinearLayout.LayoutParams hintParams =
(LinearLayout.LayoutParams) view.getLayoutParams();
otherHeights = view.getMeasuredHeight() + hintParams.topMargin
+ hintParams.bottomMargin;
}
}
// getMaxAvailableHeight() subtracts the padding, so we put it back
// to get the available height for the whole window
int padding = 0;
Drawable background = mPopup.getBackground();
if (background != null) {
background.getPadding(mTempRect);
padding = mTempRect.top + mTempRect.bottom;
// If we don't have an explicit vertical offset, determine one from the window
// background so that content will line up.
if (!mDropDownVerticalOffsetSet) {
mDropDownVerticalOffset = -mTempRect.top;
}
} else {
mTempRect.setEmpty();
}
// Max height available on the screen for a popup.
boolean ignoreBottomDecorations =
mPopup.getInputMethodMode() == PopupWindow.INPUT_METHOD_NOT_NEEDED;
final int maxHeight = mPopup.getMaxAvailableHeight(
getAnchorView(), mDropDownVerticalOffset, ignoreBottomDecorations);
if (mDropDownAlwaysVisible || mDropDownHeight == ViewGroup.LayoutParams.MATCH_PARENT) {
return maxHeight + padding;
}
final int childWidthSpec;
switch (mDropDownWidth) {
case ViewGroup.LayoutParams.WRAP_CONTENT:
childWidthSpec = MeasureSpec.makeMeasureSpec(
mContext.getResources().getDisplayMetrics().widthPixels -
(mTempRect.left + mTempRect.right),
MeasureSpec.AT_MOST);
break;
case ViewGroup.LayoutParams.MATCH_PARENT:
childWidthSpec = MeasureSpec.makeMeasureSpec(
mContext.getResources().getDisplayMetrics().widthPixels -
(mTempRect.left + mTempRect.right),
MeasureSpec.EXACTLY);
break;
default:
childWidthSpec = MeasureSpec.makeMeasureSpec(mDropDownWidth, MeasureSpec.EXACTLY);
break;
}
final int listContent = mDropDownList.measureHeightOfChildren(childWidthSpec,
0, ListView.NO_POSITION, maxHeight - otherHeights, -1);
// add padding only if the list has items in it, that way we don't show
// the popup if it is not needed
if (listContent > 0) otherHeights += padding;
return listContent + otherHeights;
}
/**
* Abstract class that forwards touch events to a {@link ListPopupWindow}.
*
* @hide
*/
public static abstract class ForwardingListener
implements View.OnTouchListener, View.OnAttachStateChangeListener {
/** Scaled touch slop, used for detecting movement outside bounds. */
private final float mScaledTouchSlop;
/** Timeout before disallowing intercept on the source's parent. */
private final int mTapTimeout;
/** Timeout before accepting a long-press to start forwarding. */
private final int mLongPressTimeout;
/** Source view from which events are forwarded. */
private final View mSrc;
/** Runnable used to prevent conflicts with scrolling parents. */
private Runnable mDisallowIntercept;
/** Runnable used to trigger forwarding on long-press. */
private Runnable mTriggerLongPress;
/** Whether this listener is currently forwarding touch events. */
private boolean mForwarding;
/**
* Whether forwarding was initiated by a long-press. If so, we won't
* force the window to dismiss when the touch stream ends.
*/
private boolean mWasLongPress;
/** The id of the first pointer down in the current event stream. */
private int mActivePointerId;
public ForwardingListener(View src) {
mSrc = src;
mScaledTouchSlop = ViewConfiguration.get(src.getContext()).getScaledTouchSlop();
mTapTimeout = ViewConfiguration.getTapTimeout();
// Use a medium-press timeout. Halfway between tap and long-press.
mLongPressTimeout = (mTapTimeout + ViewConfiguration.getLongPressTimeout()) / 2;
src.addOnAttachStateChangeListener(this);
}
/**
* Returns the popup to which this listener is forwarding events.
* <p>
* Override this to return the correct popup. If the popup is displayed
* asynchronously, you may also need to override
* {@link #onForwardingStopped} to prevent premature cancelation of
* forwarding.
*
* @return the popup to which this listener is forwarding events
*/
public abstract ListPopupWindow getPopup();
@Override
public boolean onTouch(View v, MotionEvent event) {
final boolean wasForwarding = mForwarding;
final boolean forwarding;
if (wasForwarding) {
forwarding = onTouchForwarded(event) || !onForwardingStopped();
} else {
forwarding = onTouchObserved(event) && onForwardingStarted();
if (forwarding) {
// Make sure we cancel any ongoing source event stream.
final long now = SystemClock.uptimeMillis();
final MotionEvent e = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL,
0.0f, 0.0f, 0);
mSrc.onTouchEvent(e);
e.recycle();
}
}
mForwarding = forwarding;
return forwarding || wasForwarding;
}
@Override
public void onViewAttachedToWindow(View v) {
}
@Override
public void onViewDetachedFromWindow(View v) {
mForwarding = false;
mActivePointerId = MotionEvent.INVALID_POINTER_ID;
if (mDisallowIntercept != null) {
mSrc.removeCallbacks(mDisallowIntercept);
}
}
/**
* Called when forwarding would like to start.
* <p>
* By default, this will show the popup returned by {@link #getPopup()}.
* It may be overridden to perform another action, like clicking the
* source view or preparing the popup before showing it.
*
* @return true to start forwarding, false otherwise
*/
protected boolean onForwardingStarted() {
final ListPopupWindow popup = getPopup();
if (popup != null && !popup.isShowing()) {
popup.show();
}
return true;
}
/**
* Called when forwarding would like to stop.
* <p>
* By default, this will dismiss the popup returned by
* {@link #getPopup()}. It may be overridden to perform some other
* action.
*
* @return true to stop forwarding, false otherwise
*/
protected boolean onForwardingStopped() {
final ListPopupWindow popup = getPopup();
if (popup != null && popup.isShowing()) {
popup.dismiss();
}
return true;
}
/**
* Observes motion events and determines when to start forwarding.
*
* @param srcEvent motion event in source view coordinates
* @return true to start forwarding motion events, false otherwise
*/
private boolean onTouchObserved(MotionEvent srcEvent) {
final View src = mSrc;
if (!src.isEnabled()) {
return false;
}
final int actionMasked = srcEvent.getActionMasked();
switch (actionMasked) {
case MotionEvent.ACTION_DOWN:
mActivePointerId = srcEvent.getPointerId(0);
mWasLongPress = false;
if (mDisallowIntercept == null) {
mDisallowIntercept = new DisallowIntercept();
}
src.postDelayed(mDisallowIntercept, mTapTimeout);
if (mTriggerLongPress == null) {
mTriggerLongPress = new TriggerLongPress();
}
src.postDelayed(mTriggerLongPress, mLongPressTimeout);
break;
case MotionEvent.ACTION_MOVE:
final int activePointerIndex = srcEvent.findPointerIndex(mActivePointerId);
if (activePointerIndex >= 0) {
final float x = srcEvent.getX(activePointerIndex);
final float y = srcEvent.getY(activePointerIndex);
// Has the pointer has moved outside of the view?
if (!src.pointInView(x, y, mScaledTouchSlop)) {
clearCallbacks();
// Don't let the parent intercept our events.
src.getParent().requestDisallowInterceptTouchEvent(true);
return true;
}
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
clearCallbacks();
break;
}
return false;
}
private void clearCallbacks() {
if (mTriggerLongPress != null) {
mSrc.removeCallbacks(mTriggerLongPress);
}
if (mDisallowIntercept != null) {
mSrc.removeCallbacks(mDisallowIntercept);
}
}
private void onLongPress() {
clearCallbacks();
final View src = mSrc;
if (!src.isEnabled() || src.isLongClickable()) {
// Ignore long-press if the view is disabled or has its own
// handler.
return;
}
if (!onForwardingStarted()) {
return;
}
// Don't let the parent intercept our events.
src.getParent().requestDisallowInterceptTouchEvent(true);
// Make sure we cancel any ongoing source event stream.
final long now = SystemClock.uptimeMillis();
final MotionEvent e = MotionEvent.obtain(now, now, MotionEvent.ACTION_CANCEL, 0, 0, 0);
src.onTouchEvent(e);
e.recycle();
mForwarding = true;
mWasLongPress = true;
}
/**
* Handled forwarded motion events and determines when to stop
* forwarding.
*
* @param srcEvent motion event in source view coordinates
* @return true to continue forwarding motion events, false to cancel
*/
private boolean onTouchForwarded(MotionEvent srcEvent) {
final View src = mSrc;
final ListPopupWindow popup = getPopup();
if (popup == null || !popup.isShowing()) {
return false;
}
final DropDownListView dst = popup.mDropDownList;
if (dst == null || !dst.isShown()) {
return false;
}
// Convert event to destination-local coordinates.
final MotionEvent dstEvent = MotionEvent.obtainNoHistory(srcEvent);
src.toGlobalMotionEvent(dstEvent);
dst.toLocalMotionEvent(dstEvent);
// Forward converted event to destination view, then recycle it.
final boolean handled = dst.onForwardedEvent(dstEvent, mActivePointerId);
dstEvent.recycle();
// Always cancel forwarding when the touch stream ends.
final int action = srcEvent.getActionMasked();
final boolean keepForwarding = action != MotionEvent.ACTION_UP
&& action != MotionEvent.ACTION_CANCEL;
return handled && keepForwarding;
}
private class DisallowIntercept implements Runnable {
@Override
public void run() {
final ViewParent parent = mSrc.getParent();
parent.requestDisallowInterceptTouchEvent(true);
}
}
private class TriggerLongPress implements Runnable {
@Override
public void run() {
onLongPress();
}
}
}
/**
* <p>Wrapper class for a ListView. This wrapper can hijack the focus to
* make sure the list uses the appropriate drawables and states when
* displayed on screen within a drop down. The focus is never actually
* passed to the drop down in this mode; the list only looks focused.</p>
*/
private static class DropDownListView extends ListView {
/** Duration in milliseconds of the drag-to-open click animation. */
private static final long CLICK_ANIM_DURATION = 150;
/** Target alpha value for drag-to-open click animation. */
private static final int CLICK_ANIM_ALPHA = 0x80;
/** Wrapper around Drawable's <code>alpha</code> property. */
private static final IntProperty<Drawable> DRAWABLE_ALPHA =
new IntProperty<Drawable>("alpha") {
@Override
public void setValue(Drawable object, int value) {
object.setAlpha(value);
}
@Override
public Integer get(Drawable object) {
return object.getAlpha();
}
};
/*
* WARNING: This is a workaround for a touch mode issue.
*
* Touch mode is propagated lazily to windows. This causes problems in
* the following scenario:
* - Type something in the AutoCompleteTextView and get some results
* - Move down with the d-pad to select an item in the list
* - Move up with the d-pad until the selection disappears
* - Type more text in the AutoCompleteTextView *using the soft keyboard*
* and get new results; you are now in touch mode
* - The selection comes back on the first item in the list, even though
* the list is supposed to be in touch mode
*
* Using the soft keyboard triggers the touch mode change but that change
* is propagated to our window only after the first list layout, therefore
* after the list attempts to resurrect the selection.
*
* The trick to work around this issue is to pretend the list is in touch
* mode when we know that the selection should not appear, that is when
* we know the user moved the selection away from the list.
*
* This boolean is set to true whenever we explicitly hide the list's
* selection and reset to false whenever we know the user moved the
* selection back to the list.
*
* When this boolean is true, isInTouchMode() returns true, otherwise it
* returns super.isInTouchMode().
*/
private boolean mListSelectionHidden;
/**
* True if this wrapper should fake focus.
*/
private boolean mHijackFocus;
/** Whether to force drawing of the pressed state selector. */
private boolean mDrawsInPressedState;
/** Current drag-to-open click animation, if any. */
private Animator mClickAnimation;
/** Helper for drag-to-open auto scrolling. */
private AbsListViewAutoScroller mScrollHelper;
/**
* <p>Creates a new list view wrapper.</p>
*
* @param context this view's context
*/
public DropDownListView(Context context, boolean hijackFocus) {
super(context, null, com.android.internal.R.attr.dropDownListViewStyle);
mHijackFocus = hijackFocus;
// TODO: Add an API to control this
setCacheColorHint(0); // Transparent, since the background drawable could be anything.
}
/**
* Handles forwarded events.
*
* @param activePointerId id of the pointer that activated forwarding
* @return whether the event was handled
*/
public boolean onForwardedEvent(MotionEvent event, int activePointerId) {
boolean handledEvent = true;
boolean clearPressedItem = false;
final int actionMasked = event.getActionMasked();
switch (actionMasked) {
case MotionEvent.ACTION_CANCEL:
handledEvent = false;
break;
case MotionEvent.ACTION_UP:
handledEvent = false;
// $FALL-THROUGH$
case MotionEvent.ACTION_MOVE:
final int activeIndex = event.findPointerIndex(activePointerId);
if (activeIndex < 0) {
handledEvent = false;
break;
}
final int x = (int) event.getX(activeIndex);
final int y = (int) event.getY(activeIndex);
final int position = pointToPosition(x, y);
if (position == INVALID_POSITION) {
clearPressedItem = true;
break;
}
final View child = getChildAt(position - getFirstVisiblePosition());
setPressedItem(child, position, x, y);
handledEvent = true;
if (actionMasked == MotionEvent.ACTION_UP) {
clickPressedItem(child, position);
}
break;
}
// Failure to handle the event cancels forwarding.
if (!handledEvent || clearPressedItem) {
clearPressedItem();
}
// Manage automatic scrolling.
if (handledEvent) {
if (mScrollHelper == null) {
mScrollHelper = new AbsListViewAutoScroller(this);
}
mScrollHelper.setEnabled(true);
mScrollHelper.onTouch(this, event);
} else if (mScrollHelper != null) {
mScrollHelper.setEnabled(false);
}
return handledEvent;
}
/**
* Starts an alpha animation on the selector. When the animation ends,
* the list performs a click on the item.
*/
private void clickPressedItem(final View child, final int position) {
final long id = getItemIdAtPosition(position);
final Animator anim = ObjectAnimator.ofInt(
mSelector, DRAWABLE_ALPHA, 0xFF, CLICK_ANIM_ALPHA, 0xFF);
anim.setDuration(CLICK_ANIM_DURATION);
anim.setInterpolator(new AccelerateDecelerateInterpolator());
anim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
performItemClick(child, position, id);
}
});
anim.start();
if (mClickAnimation != null) {
mClickAnimation.cancel();
}
mClickAnimation = anim;
}
private void clearPressedItem() {
mDrawsInPressedState = false;
setPressed(false);
updateSelectorState();
final View motionView = getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null) {
motionView.setPressed(false);
}
if (mClickAnimation != null) {
mClickAnimation.cancel();
mClickAnimation = null;
}
}
private void setPressedItem(View child, int position, float x, float y) {
mDrawsInPressedState = true;
// Ordering is essential. First, update the container's pressed state.
drawableHotspotChanged(x, y);
if (!isPressed()) {
setPressed(true);
}
// Next, run layout if we need to stabilize child positions.
if (mDataChanged) {
layoutChildren();
}
// Manage the pressed view based on motion position. This allows us to
// play nicely with actual touch and scroll events.
final View motionView = getChildAt(mMotionPosition - mFirstPosition);
if (motionView != null && motionView != child && motionView.isPressed()) {
motionView.setPressed(false);
}
mMotionPosition = position;
// Offset for child coordinates.
final float childX = x - child.getLeft();
final float childY = y - child.getTop();
child.drawableHotspotChanged(childX, childY);
if (!child.isPressed()) {
child.setPressed(true);
}
// Ensure that keyboard focus starts from the last touched position.
setSelectedPositionInt(position);
positionSelectorLikeTouch(position, child, x, y);
// Refresh the drawable state to reflect the new pressed state,
// which will also update the selector state.
refreshDrawableState();
if (mClickAnimation != null) {
mClickAnimation.cancel();
mClickAnimation = null;
}
}
@Override
boolean touchModeDrawsInPressedState() {
return mDrawsInPressedState || super.touchModeDrawsInPressedState();
}
/**
* <p>Avoids jarring scrolling effect by ensuring that list elements
* made of a text view fit on a single line.</p>
*
* @param position the item index in the list to get a view for
* @return the view for the specified item
*/
@Override
View obtainView(int position, boolean[] isScrap) {
View view = super.obtainView(position, isScrap);
if (view instanceof TextView) {
((TextView) view).setHorizontallyScrolling(true);
}
return view;
}
@Override
public boolean isInTouchMode() {
// WARNING: Please read the comment where mListSelectionHidden is declared
return (mHijackFocus && mListSelectionHidden) || super.isInTouchMode();
}
/**
* <p>Returns the focus state in the drop down.</p>
*
* @return true always if hijacking focus
*/
@Override
public boolean hasWindowFocus() {
return mHijackFocus || super.hasWindowFocus();
}
/**
* <p>Returns the focus state in the drop down.</p>
*
* @return true always if hijacking focus
*/
@Override
public boolean isFocused() {
return mHijackFocus || super.isFocused();
}
/**
* <p>Returns the focus state in the drop down.</p>
*
* @return true always if hijacking focus
*/
@Override
public boolean hasFocus() {
return mHijackFocus || super.hasFocus();
}
}
private class PopupDataSetObserver extends DataSetObserver {
@Override
public void onChanged() {
if (isShowing()) {
// Resize the popup to fit new content
show();
}
}
@Override
public void onInvalidated() {
dismiss();
}
}
private class ListSelectorHider implements Runnable {
public void run() {
clearListSelection();
}
}
private class ResizePopupRunnable implements Runnable {
public void run() {
if (mDropDownList != null && mDropDownList.isAttachedToWindow()
&& mDropDownList.getCount() > mDropDownList.getChildCount()
&& mDropDownList.getChildCount() <= mListItemExpandMaximum) {
mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
show();
}
}
}
private class PopupTouchInterceptor implements OnTouchListener {
public boolean onTouch(View v, MotionEvent event) {
final int action = event.getAction();
final int x = (int) event.getX();
final int y = (int) event.getY();
if (action == MotionEvent.ACTION_DOWN &&
mPopup != null && mPopup.isShowing() &&
(x >= 0 && x < mPopup.getWidth() && y >= 0 && y < mPopup.getHeight())) {
mHandler.postDelayed(mResizePopupRunnable, EXPAND_LIST_TIMEOUT);
} else if (action == MotionEvent.ACTION_UP) {
mHandler.removeCallbacks(mResizePopupRunnable);
}
return false;
}
}
private class PopupScrollListener implements ListView.OnScrollListener {
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
int totalItemCount) {
}
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == SCROLL_STATE_TOUCH_SCROLL &&
!isInputMethodNotNeeded() && mPopup.getContentView() != null) {
mHandler.removeCallbacks(mResizePopupRunnable);
mResizePopupRunnable.run();
}
}
}
}