/**
* Copyright (C) 2016 Hyphenate Inc. All rights reserved.
*
* 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.
*/
/*******************************************************************************
* Copyright 2011, 2012 Chris Banes.
*
* 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 com.fanxin.easeui.widget.photoview;
import java.lang.ref.WeakReference;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.Matrix.ScaleToFit;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.view.ViewTreeObserver;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
class PhotoViewAttacher implements IPhotoView, View.OnTouchListener, VersionedGestureDetector.OnGestureListener,
GestureDetector.OnDoubleTapListener, ViewTreeObserver.OnGlobalLayoutListener {
static final String LOG_TAG = "PhotoViewAttacher";
// let debug flag be dynamic, but still Proguard can be used to remove from
// release builds
static final boolean DEBUG = Log.isLoggable(LOG_TAG, Log.DEBUG);
static final int EDGE_NONE = -1;
static final int EDGE_LEFT = 0;
static final int EDGE_RIGHT = 1;
static final int EDGE_BOTH = 2;
public static final float DEFAULT_MAX_SCALE = 2.0f;
// public static final float DEFAULT_MID_SCALE = 1.75f;
public static final float DEFAULT_MIN_SCALE = 1.0f;
private float mMinScale = DEFAULT_MIN_SCALE;
// private float mMidScale = DEFAULT_MID_SCALE;
private float mMaxScale = DEFAULT_MAX_SCALE;
private boolean mAllowParentInterceptOnEdge = true;
// private static void checkZoomLevels(float minZoom, float midZoom,
// float maxZoom) {
// if (minZoom >= midZoom) {
// throw new IllegalArgumentException(
// "MinZoom should be less than MidZoom");
// } else if (midZoom >= maxZoom) {
// throw new IllegalArgumentException(
// "MidZoom should be less than MaxZoom");
// }
// }
private static void checkZoomLevels(float minZoom,float maxZoom) {
if (minZoom >= maxZoom) {
throw new IllegalArgumentException("MinZoom should be less than maxZoom");
} /*else if (midZoom >= maxZoom) {
throw new IllegalArgumentException("MidZoom should be less than MaxZoom");
}*/
}
/**
* @return true if the ImageView exists, and it's Drawable existss
*/
private static boolean hasDrawable(ImageView imageView) {
return null != imageView && null != imageView.getDrawable();
}
/**
* @return true if the ScaleType is supported.
*/
private static boolean isSupportedScaleType(final ScaleType scaleType) {
if (null == scaleType) {
return false;
}
switch (scaleType) {
case MATRIX:
throw new IllegalArgumentException(scaleType.name() + " is not supported in PhotoView");
default:
return true;
}
}
/**
* Set's the ImageView's ScaleType to Matrix.
*/
private static void setImageViewScaleTypeMatrix(ImageView imageView) {
if (null != imageView) {
if (imageView instanceof EasePhotoView) {
/**
* PhotoView sets it's own ScaleType to Matrix, then diverts all
* calls setScaleType to this.setScaleType. Basically we don't
* need to do anything here
*/
} else {
imageView.setScaleType(ScaleType.MATRIX);
}
}
}
private WeakReference<ImageView> mImageView;
private ViewTreeObserver mViewTreeObserver;
// Gesture Detectors
private GestureDetector mGestureDetector;
private VersionedGestureDetector mScaleDragDetector;
// These are set so we don't keep allocating them on the heap
private final Matrix mBaseMatrix = new Matrix();
private final Matrix mDrawMatrix = new Matrix();
private final Matrix mSuppMatrix = new Matrix();
private final RectF mDisplayRect = new RectF();
private final float[] mMatrixValues = new float[9];
// Listeners
private OnMatrixChangedListener mMatrixChangeListener;
private OnPhotoTapListener mPhotoTapListener;
private OnViewTapListener mViewTapListener;
private OnLongClickListener mLongClickListener;
private int mIvTop, mIvRight, mIvBottom, mIvLeft;
private FlingRunnable mCurrentFlingRunnable;
private int mScrollEdge = EDGE_BOTH;
private boolean mZoomEnabled;
private ScaleType mScaleType = ScaleType.FIT_CENTER;
public PhotoViewAttacher(ImageView imageView) {
mImageView = new WeakReference<ImageView>(imageView);
imageView.setOnTouchListener(this);
mViewTreeObserver = imageView.getViewTreeObserver();
mViewTreeObserver.addOnGlobalLayoutListener(this);
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
if (!imageView.isInEditMode()) {
// Create Gesture Detectors...
mScaleDragDetector = VersionedGestureDetector.newInstance(imageView.getContext(), this);
mGestureDetector = new GestureDetector(imageView.getContext(),
new GestureDetector.SimpleOnGestureListener() {
// forward long click listener
@Override
public void onLongPress(MotionEvent e) {
if (null != mLongClickListener) {
mLongClickListener.onLongClick(mImageView.get());
}
}
});
mGestureDetector.setOnDoubleTapListener(this);
// Finally, update the UI so that we're zoomable
setZoomable(true);
}
}
@Override
public final boolean canZoom() {
return mZoomEnabled;
}
/**
* Clean-up the resources attached to this object. This needs to be called
* when the ImageView is no longer used. A good example is from
* {@link android.view.View#onDetachedFromWindow()} or from
* {@link android.app.Activity#onDestroy()}. This is automatically called if
* you are using {@link EasePhotoView.co.senab.photoview.PhotoView}.
*/
@SuppressLint("NewApi")
@SuppressWarnings("deprecation")
public final void cleanup() {
if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN) {
if (null != mImageView) {
mImageView.get().getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
if (null != mViewTreeObserver && mViewTreeObserver.isAlive()) {
mViewTreeObserver.removeOnGlobalLayoutListener(this);
mViewTreeObserver = null;
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
} else {
if (null != mImageView) {
mImageView.get().getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
if (null != mViewTreeObserver && mViewTreeObserver.isAlive()) {
mViewTreeObserver.removeGlobalOnLayoutListener(this);
mViewTreeObserver = null;
// Clear listeners too
mMatrixChangeListener = null;
mPhotoTapListener = null;
mViewTapListener = null;
// Finally, clear ImageView
mImageView = null;
}
}
}
@Override
public final RectF getDisplayRect() {
checkMatrixBounds();
return getDisplayRect(getDisplayMatrix());
}
public final ImageView getImageView() {
ImageView imageView = null;
if (null != mImageView) {
imageView = mImageView.get();
}
// If we don't have an ImageView, call cleanup()
if (null == imageView) {
cleanup();
throw new IllegalStateException(
"ImageView no longer exists. You should not use this PhotoViewAttacher any more.");
}
return imageView;
}
@Override
public float getMinScale() {
return mMinScale;
}
// @Override
// public float getMidScale() {
// return mMidScale;
// }
@Override
public float getMaxScale() {
return mMaxScale;
}
@Override
public final float getScale() {
return getValue(mSuppMatrix, Matrix.MSCALE_X);
}
@Override
public final ScaleType getScaleType() {
return mScaleType;
}
public final boolean onDoubleTap(MotionEvent ev) {
try {
float scale = getScale();
float x = ev.getX();
float y = ev.getY();
/*
* if (scale < mMidScale) { zoomTo(mMidScale, x, y); } else
*/if (/* scale >= mMidScale && */scale < mMaxScale) {
zoomTo(mMaxScale, x, y);
} else {
zoomTo(mMinScale, x, y);
}
} catch (ArrayIndexOutOfBoundsException e) {
// Can sometimes happen when getX() and getY() is called
}
return true;
}
public final boolean onDoubleTapEvent(MotionEvent e) {
// Wait for the confirmed onDoubleTap() instead
return false;
}
public final void onDrag(float dx, float dy) {
if (DEBUG) {
Log.d(LOG_TAG, String.format("onDrag: dx: %.2f. dy: %.2f", dx, dy));
}
ImageView imageView = getImageView();
if (null != imageView && hasDrawable(imageView)) {
mSuppMatrix.postTranslate(dx, dy);
checkAndDisplayMatrix();
/**
* Here we decide whether to let the ImageView's parent to start
* taking over the touch event.
*
* First we check whether this function is enabled. We never want
* the parent to take over if we're scaling. We then check the edge
* we're on, and the direction of the scroll (i.e. if we're pulling
* against the edge, aka 'overscrolling', let the parent take over).
*/
if (mAllowParentInterceptOnEdge && !mScaleDragDetector.isScaling()) {
if (mScrollEdge == EDGE_BOTH || (mScrollEdge == EDGE_LEFT && dx >= 1f)
|| (mScrollEdge == EDGE_RIGHT && dx <= -1f)) {
imageView.getParent().requestDisallowInterceptTouchEvent(false);
}
}
}
}
@Override
public final void onFling(float startX, float startY, float velocityX, float velocityY) {
if (DEBUG) {
Log.d(LOG_TAG, "onFling. sX: " + startX + " sY: " + startY + " Vx: " + velocityX + " Vy: " + velocityY);
}
ImageView imageView = getImageView();
if (hasDrawable(imageView)) {
mCurrentFlingRunnable = new FlingRunnable(imageView.getContext());
mCurrentFlingRunnable.fling(imageView.getWidth(), imageView.getHeight(), (int) velocityX, (int) velocityY);
imageView.post(mCurrentFlingRunnable);
}
}
@Override
public final void onGlobalLayout() {
ImageView imageView = getImageView();
if (null != imageView && mZoomEnabled) {
final int top = imageView.getTop();
final int right = imageView.getRight();
final int bottom = imageView.getBottom();
final int left = imageView.getLeft();
/**
* We need to check whether the ImageView's bounds have changed.
* This would be easier if we targeted API 11+ as we could just use
* View.OnLayoutChangeListener. Instead we have to replicate the
* work, keeping track of the ImageView's bounds and then checking
* if the values change.
*/
if (top != mIvTop || bottom != mIvBottom || left != mIvLeft || right != mIvRight) {
// Update our base matrix, as the bounds have changed
updateBaseMatrix(imageView.getDrawable());
// Update values as something has changed
mIvTop = top;
mIvRight = right;
mIvBottom = bottom;
mIvLeft = left;
}
}
}
public final void onScale(float scaleFactor, float focusX, float focusY) {
if (DEBUG) {
Log.d(LOG_TAG, String.format("onScale: scale: %.2f. fX: %.2f. fY: %.2f", scaleFactor, focusX, focusY));
}
if (hasDrawable(getImageView()) && (getScale() < mMaxScale || scaleFactor < 1f)) {
mSuppMatrix.postScale(scaleFactor, scaleFactor, focusX, focusY);
checkAndDisplayMatrix();
}
}
public final boolean onSingleTapConfirmed(MotionEvent e) {
ImageView imageView = getImageView();
if (null != imageView) {
if (null != mPhotoTapListener) {
final RectF displayRect = getDisplayRect();
if (null != displayRect) {
final float x = e.getX(), y = e.getY();
// Check to see if the user tapped on the photo
if (displayRect.contains(x, y)) {
float xResult = (x - displayRect.left) / displayRect.width();
float yResult = (y - displayRect.top) / displayRect.height();
mPhotoTapListener.onPhotoTap(imageView, xResult, yResult);
return true;
}
}
}
if (null != mViewTapListener) {
mViewTapListener.onViewTap(imageView, e.getX(), e.getY());
}
}
return false;
}
@Override
public final boolean onTouch(View v, MotionEvent ev) {
boolean handled = false;
if (mZoomEnabled) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
// First, disable the Parent from intercepting the touch
// event
v.getParent().requestDisallowInterceptTouchEvent(true);
// If we're flinging, and the user presses down, cancel
// fling
cancelFling();
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
// If the user has zoomed less than min scale, zoom back
// to min scale
if (getScale() < mMinScale) {
RectF rect = getDisplayRect();
if (null != rect) {
v.post(new AnimatedZoomRunnable(getScale(), mMinScale, rect.centerX(), rect.centerY()));
handled = true;
}
}
break;
}
// Check to see if the user double tapped
if (null != mGestureDetector && mGestureDetector.onTouchEvent(ev)) {
handled = true;
}
// Finally, try the Scale/Drag detector
if (null != mScaleDragDetector && mScaleDragDetector.onTouchEvent(ev)) {
handled = true;
}
}
return handled;
}
@Override
public void setAllowParentInterceptOnEdge(boolean allow) {
mAllowParentInterceptOnEdge = allow;
}
@Override
public void setMinScale(float minScale) {
// checkZoomLevels(minScale, mMidScale, mMaxScale);
checkZoomLevels(minScale, mMaxScale);
mMinScale = minScale;
}
// @Override
// public void setMidScale(float midScale) {
// checkZoomLevels(mMinScale, midScale, mMaxScale);
// mMidScale = midScale;
// }
@Override
public void setMaxScale(float maxScale) {
// checkZoomLevels(mMinScale, mMidScale, maxScale);
checkZoomLevels(mMinScale, maxScale);
mMaxScale = maxScale;
}
@Override
public final void setOnLongClickListener(OnLongClickListener listener) {
mLongClickListener = listener;
}
@Override
public final void setOnMatrixChangeListener(OnMatrixChangedListener listener) {
mMatrixChangeListener = listener;
}
@Override
public final void setOnPhotoTapListener(OnPhotoTapListener listener) {
mPhotoTapListener = listener;
}
@Override
public final void setOnViewTapListener(OnViewTapListener listener) {
mViewTapListener = listener;
}
@Override
public final void setScaleType(ScaleType scaleType) {
if (isSupportedScaleType(scaleType) && scaleType != mScaleType) {
mScaleType = scaleType;
// Finally update
update();
}
}
@Override
public final void setZoomable(boolean zoomable) {
mZoomEnabled = zoomable;
update();
}
public final void update() {
ImageView imageView = getImageView();
if (null != imageView) {
if (mZoomEnabled) {
// Make sure we using MATRIX Scale Type
setImageViewScaleTypeMatrix(imageView);
// Update the base matrix using the current drawable
updateBaseMatrix(imageView.getDrawable());
} else {
// Reset the Matrix...
resetMatrix();
}
}
}
@Override
public final void zoomTo(float scale, float focalX, float focalY) {
ImageView imageView = getImageView();
if (null != imageView) {
imageView.post(new AnimatedZoomRunnable(getScale(), scale, focalX, focalY));
}
}
protected Matrix getDisplayMatrix() {
mDrawMatrix.set(mBaseMatrix);
mDrawMatrix.postConcat(mSuppMatrix);
return mDrawMatrix;
}
private void cancelFling() {
if (null != mCurrentFlingRunnable) {
mCurrentFlingRunnable.cancelFling();
mCurrentFlingRunnable = null;
}
}
/**
* Helper method that simply checks the Matrix, and then displays the result
*/
private void checkAndDisplayMatrix() {
checkMatrixBounds();
setImageViewMatrix(getDisplayMatrix());
}
private void checkImageViewScaleType() {
ImageView imageView = getImageView();
/**
* PhotoView's getScaleType() will just divert to this.getScaleType() so
* only call if we're not attached to a PhotoView.
*/
if (null != imageView && !(imageView instanceof EasePhotoView)) {
if (imageView.getScaleType() != ScaleType.MATRIX) {
throw new IllegalStateException(
"The ImageView's ScaleType has been changed since attaching a PhotoViewAttacher");
}
}
}
private void checkMatrixBounds() {
final ImageView imageView = getImageView();
if (null == imageView) {
return;
}
final RectF rect = getDisplayRect(getDisplayMatrix());
if (null == rect) {
return;
}
final float height = rect.height(), width = rect.width();
float deltaX = 0, deltaY = 0;
final int viewHeight = imageView.getHeight();
if (height <= viewHeight) {
switch (mScaleType) {
case FIT_START:
deltaY = -rect.top;
break;
case FIT_END:
deltaY = viewHeight - height - rect.top;
break;
default:
deltaY = (viewHeight - height) / 2 - rect.top;
break;
}
} else if (rect.top > 0) {
deltaY = -rect.top;
} else if (rect.bottom < viewHeight) {
deltaY = viewHeight - rect.bottom;
}
final int viewWidth = imageView.getWidth();
if (width <= viewWidth) {
switch (mScaleType) {
case FIT_START:
deltaX = -rect.left;
break;
case FIT_END:
deltaX = viewWidth - width - rect.left;
break;
default:
deltaX = (viewWidth - width) / 2 - rect.left;
break;
}
mScrollEdge = EDGE_BOTH;
} else if (rect.left > 0) {
mScrollEdge = EDGE_LEFT;
deltaX = -rect.left;
} else if (rect.right < viewWidth) {
deltaX = viewWidth - rect.right;
mScrollEdge = EDGE_RIGHT;
} else {
mScrollEdge = EDGE_NONE;
}
// Finally actually translate the matrix
mSuppMatrix.postTranslate(deltaX, deltaY);
}
/**
* Helper method that maps the supplied Matrix to the current Drawable
*
* @param matrix
* - Matrix to map Drawable against
* @return RectF - Displayed Rectangle
*/
private RectF getDisplayRect(Matrix matrix) {
ImageView imageView = getImageView();
if (null != imageView) {
Drawable d = imageView.getDrawable();
if (null != d) {
mDisplayRect.set(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
matrix.mapRect(mDisplayRect);
return mDisplayRect;
}
}
return null;
}
/**
* Helper method that 'unpacks' a Matrix and returns the required value
*
* @param matrix
* - Matrix to unpack
* @param whichValue
* - Which value from Matrix.M* to return
* @return float - returned value
*/
private float getValue(Matrix matrix, int whichValue) {
matrix.getValues(mMatrixValues);
return mMatrixValues[whichValue];
}
/**
* Resets the Matrix back to FIT_CENTER, and then displays it.s
*/
private void resetMatrix() {
mSuppMatrix.reset();
setImageViewMatrix(getDisplayMatrix());
checkMatrixBounds();
}
private void setImageViewMatrix(Matrix matrix) {
ImageView imageView = getImageView();
if (null != imageView) {
checkImageViewScaleType();
imageView.setImageMatrix(matrix);
// Call MatrixChangedListener if needed
if (null != mMatrixChangeListener) {
RectF displayRect = getDisplayRect(matrix);
if (null != displayRect) {
mMatrixChangeListener.onMatrixChanged(displayRect);
}
}
}
}
/**
* Calculate Matrix for FIT_CENTER
*
* @param d
* - Drawable being displayed
*/
private void updateBaseMatrix(Drawable d) {
ImageView imageView = getImageView();
if (null == imageView || null == d) {
return;
}
final float viewWidth = imageView.getWidth();
final float viewHeight = imageView.getHeight();
final int drawableWidth = d.getIntrinsicWidth();
final int drawableHeight = d.getIntrinsicHeight();
mBaseMatrix.reset();
final float widthScale = viewWidth / drawableWidth;
final float heightScale = viewHeight / drawableHeight;
if (mScaleType == ScaleType.CENTER) {
mBaseMatrix.postTranslate((viewWidth - drawableWidth) / 2F, (viewHeight - drawableHeight) / 2F);
} else if (mScaleType == ScaleType.CENTER_CROP) {
float scale = Math.max(widthScale, heightScale);
mBaseMatrix.postScale(scale, scale);
mBaseMatrix.postTranslate((viewWidth - drawableWidth * scale) / 2F,
(viewHeight - drawableHeight * scale) / 2F);
} else if (mScaleType == ScaleType.CENTER_INSIDE) {
float scale = Math.min(1.0f, Math.min(widthScale, heightScale));
mBaseMatrix.postScale(scale, scale);
mBaseMatrix.postTranslate((viewWidth - drawableWidth * scale) / 2F,
(viewHeight - drawableHeight * scale) / 2F);
} else {
RectF mTempSrc = new RectF(0, 0, drawableWidth, drawableHeight);
RectF mTempDst = new RectF(0, 0, viewWidth, viewHeight);
switch (mScaleType) {
case FIT_CENTER:
mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.CENTER);
break;
case FIT_START:
mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.START);
break;
case FIT_END:
mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.END);
break;
case FIT_XY:
mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.FILL);
break;
default:
break;
}
}
resetMatrix();
}
/**
* Interface definition for a callback to be invoked when the internal
* Matrix has changed for this View.
*
* @author Chris Banes
*/
public static interface OnMatrixChangedListener {
/**
* Callback for when the Matrix displaying the Drawable has changed.
* This could be because the View's bounds have changed, or the user has
* zoomed.
*
* @param rect
* - Rectangle displaying the Drawable's new bounds.
*/
void onMatrixChanged(RectF rect);
}
/**
* Interface definition for a callback to be invoked when the Photo is
* tapped with a single tap.
*
* @author Chris Banes
*/
public static interface OnPhotoTapListener {
/**
* A callback to receive where the user taps on a photo. You will only
* receive a callback if the user taps on the actual photo, tapping on
* 'whitespace' will be ignored.
*
* @param view
* - View the user tapped.
* @param x
* - where the user tapped from the of the Drawable, as
* percentage of the Drawable width.
* @param y
* - where the user tapped from the top of the Drawable, as
* percentage of the Drawable height.
*/
void onPhotoTap(View view, float x, float y);
}
/**
* Interface definition for a callback to be invoked when the ImageView is
* tapped with a single tap.
*
* @author Chris Banes
*/
public static interface OnViewTapListener {
/**
* A callback to receive where the user taps on a ImageView. You will
* receive a callback if the user taps anywhere on the view, tapping on
* 'whitespace' will not be ignored.
*
* @param view
* - View the user tapped.
* @param x
* - where the user tapped from the left of the View.
* @param y
* - where the user tapped from the top of the View.
*/
void onViewTap(View view, float x, float y);
}
private class AnimatedZoomRunnable implements Runnable {
// These are 'postScale' values, means they're compounded each iteration
static final float ANIMATION_SCALE_PER_ITERATION_IN = 1.07f;
static final float ANIMATION_SCALE_PER_ITERATION_OUT = 0.93f;
private final float mFocalX, mFocalY;
private final float mTargetZoom;
private final float mDeltaScale;
public AnimatedZoomRunnable(final float currentZoom, final float targetZoom, final float focalX,
final float focalY) {
mTargetZoom = targetZoom;
mFocalX = focalX;
mFocalY = focalY;
if (currentZoom < targetZoom) {
mDeltaScale = ANIMATION_SCALE_PER_ITERATION_IN;
} else {
mDeltaScale = ANIMATION_SCALE_PER_ITERATION_OUT;
}
}
public void run() {
ImageView imageView = getImageView();
if (null != imageView) {
mSuppMatrix.postScale(mDeltaScale, mDeltaScale, mFocalX, mFocalY);
checkAndDisplayMatrix();
final float currentScale = getScale();
if ((mDeltaScale > 1f && currentScale < mTargetZoom)
|| (mDeltaScale < 1f && mTargetZoom < currentScale)) {
// We haven't hit our target scale yet, so post ourselves
// again
Compat.postOnAnimation(imageView, this);
} else {
// We've scaled past our target zoom, so calculate the
// necessary scale so we're back at target zoom
final float delta = mTargetZoom / currentScale;
mSuppMatrix.postScale(delta, delta, mFocalX, mFocalY);
checkAndDisplayMatrix();
}
}
}
}
private class FlingRunnable implements Runnable {
private final ScrollerProxy mScroller;
private int mCurrentX, mCurrentY;
public FlingRunnable(Context context) {
mScroller = ScrollerProxy.getScroller(context);
}
public void cancelFling() {
if (DEBUG) {
Log.d(LOG_TAG, "Cancel Fling");
}
mScroller.forceFinished(true);
}
public void fling(int viewWidth, int viewHeight, int velocityX, int velocityY) {
final RectF rect = getDisplayRect();
if (null == rect) {
return;
}
final int startX = Math.round(-rect.left);
final int minX, maxX, minY, maxY;
if (viewWidth < rect.width()) {
minX = 0;
maxX = Math.round(rect.width() - viewWidth);
} else {
minX = maxX = startX;
}
final int startY = Math.round(-rect.top);
if (viewHeight < rect.height()) {
minY = 0;
maxY = Math.round(rect.height() - viewHeight);
} else {
minY = maxY = startY;
}
mCurrentX = startX;
mCurrentY = startY;
if (DEBUG) {
Log.d(LOG_TAG, "fling. StartX:" + startX + " StartY:" + startY + " MaxX:" + maxX + " MaxY:" + maxY);
}
// If we actually can move, fling the scroller
if (startX != maxX || startY != maxY) {
mScroller.fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY, 0, 0);
}
}
@Override
public void run() {
ImageView imageView = getImageView();
if (null != imageView && mScroller.computeScrollOffset()) {
final int newX = mScroller.getCurrX();
final int newY = mScroller.getCurrY();
if (DEBUG) {
Log.d(LOG_TAG, "fling run(). CurrentX:" + mCurrentX + " CurrentY:" + mCurrentY + " NewX:" + newX
+ " NewY:" + newY);
}
mSuppMatrix.postTranslate(mCurrentX - newX, mCurrentY - newY);
setImageViewMatrix(getDisplayMatrix());
mCurrentX = newX;
mCurrentY = newY;
// Post On animation
Compat.postOnAnimation(imageView, this);
}
}
}
@Override
public float getMidScale() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void setMidScale(float midScale) {
// TODO Auto-generated method stub
}
}