/*
* Copyright (C) 2014 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.support.v17.leanback.widget;
import android.os.Handler;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.SharedElementCallback;
import android.support.v4.view.ViewCompat;
import android.support.v17.leanback.R;
import android.support.v17.leanback.transition.TransitionListener;
import android.support.v17.leanback.transition.TransitionHelper;
import android.support.v17.leanback.widget.DetailsOverviewRowPresenter.ViewHolder;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Matrix;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.MeasureSpec;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import java.util.List;
final class DetailsOverviewSharedElementHelper extends SharedElementCallback {
private static final String TAG = "DetailsOverviewSharedElementHelper";
private static final boolean DEBUG = false;
private ViewHolder mViewHolder;
private Activity mActivityToRunTransition;
private boolean mStartedPostpone;
private String mSharedElementName;
private int mRightPanelWidth;
private int mRightPanelHeight;
private ScaleType mSavedScaleType;
private Matrix mSavedMatrix;
private boolean hasImageViewScaleChange(View snapshotView) {
return snapshotView instanceof ImageView;
}
private void saveImageViewScale() {
if (mSavedScaleType == null) {
// only save first time after initialize/restoreImageViewScale()
ImageView imageView = mViewHolder.mImageView;
mSavedScaleType = imageView.getScaleType();
mSavedMatrix = mSavedScaleType == ScaleType.MATRIX ? imageView.getMatrix() : null;
if (DEBUG) {
Log.d(TAG, "saveImageViewScale: "+mSavedScaleType);
}
}
}
private static void updateImageViewAfterScaleTypeChange(ImageView imageView) {
// enforcing imageView to update its internal bounds/matrix immediately
imageView.measure(
MeasureSpec.makeMeasureSpec(imageView.getMeasuredWidth(), MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(imageView.getMeasuredHeight(), MeasureSpec.EXACTLY));
imageView.layout(imageView.getLeft(), imageView.getTop(),
imageView.getRight(), imageView.getBottom());
}
private void changeImageViewScale(View snapshotView) {
ImageView snapshotImageView = (ImageView) snapshotView;
ImageView imageView = mViewHolder.mImageView;
if (DEBUG) {
Log.d(TAG, "changeImageViewScale to "+snapshotImageView.getScaleType());
}
imageView.setScaleType(snapshotImageView.getScaleType());
if (snapshotImageView.getScaleType() == ScaleType.MATRIX) {
imageView.setImageMatrix(snapshotImageView.getImageMatrix());
}
updateImageViewAfterScaleTypeChange(imageView);
}
private void restoreImageViewScale() {
if (mSavedScaleType != null) {
if (DEBUG) {
Log.d(TAG, "restoreImageViewScale to "+mSavedScaleType);
}
ImageView imageView = mViewHolder.mImageView;
imageView.setScaleType(mSavedScaleType);
if (mSavedScaleType == ScaleType.MATRIX) {
imageView.setImageMatrix(mSavedMatrix);
}
// only restore once unless another save happens
mSavedScaleType = null;
updateImageViewAfterScaleTypeChange(imageView);
}
}
@Override
public void onSharedElementStart(List<String> sharedElementNames,
List<View> sharedElements, List<View> sharedElementSnapshots) {
if (DEBUG) {
Log.d(TAG, "onSharedElementStart " + mActivityToRunTransition);
}
if (sharedElements.size() < 1) {
return;
}
View overviewView = sharedElements.get(0);
if (mViewHolder == null || mViewHolder.mOverviewFrame != overviewView) {
return;
}
View snapshot = sharedElementSnapshots.get(0);
if (hasImageViewScaleChange(snapshot)) {
saveImageViewScale();
changeImageViewScale(snapshot);
}
View imageView = mViewHolder.mImageView;
final int width = overviewView.getWidth();
final int height = overviewView.getHeight();
imageView.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
imageView.layout(0, 0, width, height);
final View rightPanel = mViewHolder.mRightPanel;
if (mRightPanelWidth != 0 && mRightPanelHeight != 0) {
rightPanel.measure(MeasureSpec.makeMeasureSpec(mRightPanelWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(mRightPanelHeight, MeasureSpec.EXACTLY));
rightPanel.layout(width, rightPanel.getTop(), width + mRightPanelWidth,
rightPanel.getTop() + mRightPanelHeight);
} else {
rightPanel.offsetLeftAndRight(width - rightPanel.getLeft());
}
mViewHolder.mActionsRow.setVisibility(View.INVISIBLE);
mViewHolder.mDetailsDescriptionFrame.setVisibility(View.INVISIBLE);
}
@Override
public void onSharedElementEnd(List<String> sharedElementNames,
List<View> sharedElements, List<View> sharedElementSnapshots) {
if (DEBUG) {
Log.d(TAG, "onSharedElementEnd " + mActivityToRunTransition);
}
if (sharedElements.size() < 1) {
return;
}
View overviewView = sharedElements.get(0);
if (mViewHolder == null || mViewHolder.mOverviewFrame != overviewView) {
return;
}
restoreImageViewScale();
// temporary let action row take focus so we defer button background animation
mViewHolder.mActionsRow.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
mViewHolder.mActionsRow.setVisibility(View.VISIBLE);
mViewHolder.mActionsRow.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
mViewHolder.mDetailsDescriptionFrame.setVisibility(View.VISIBLE);
}
void setSharedElementEnterTransition(Activity activity, String sharedElementName,
long timeoutMs) {
if (activity == null && !TextUtils.isEmpty(sharedElementName) ||
activity != null && TextUtils.isEmpty(sharedElementName)) {
throw new IllegalArgumentException();
}
if (activity == mActivityToRunTransition &&
TextUtils.equals(sharedElementName, mSharedElementName)) {
return;
}
if (mActivityToRunTransition != null) {
ActivityCompat.setEnterSharedElementCallback(mActivityToRunTransition, null);
}
mActivityToRunTransition = activity;
mSharedElementName = sharedElementName;
if (DEBUG) {
Log.d(TAG, "postponeEnterTransition " + mActivityToRunTransition);
}
ActivityCompat.setEnterSharedElementCallback(mActivityToRunTransition, this);
ActivityCompat.postponeEnterTransition(mActivityToRunTransition);
if (timeoutMs > 0) {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
if (mStartedPostpone) {
return;
}
if (DEBUG) {
Log.d(TAG, "timeout " + mActivityToRunTransition);
}
startPostponedEnterTransition();
}
}, timeoutMs);
}
}
void onBindToDrawable(ViewHolder vh) {
if (DEBUG) {
Log.d(TAG, "onBindToDrawable, could start transition of " + mActivityToRunTransition);
}
if (mViewHolder != null) {
if (DEBUG) {
Log.d(TAG, "rebind? clear transitionName on current viewHolder "
+ mViewHolder.mOverviewFrame);
}
ViewCompat.setTransitionName(mViewHolder.mOverviewFrame, null);
}
// After we got a image drawable, we can determine size of right panel.
// We want right panel to have fixed size so that the right panel don't change size
// when the overview is layout as a small bounds in transition.
mViewHolder = vh;
mViewHolder.mRightPanel.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
@Override
public void onLayoutChange(View v, int left, int top, int right, int bottom,
int oldLeft, int oldTop, int oldRight, int oldBottom) {
mViewHolder.mRightPanel.removeOnLayoutChangeListener(this);
mRightPanelWidth = mViewHolder.mRightPanel.getWidth();
mRightPanelHeight = mViewHolder.mRightPanel.getHeight();
if (DEBUG) {
Log.d(TAG, "onLayoutChange records size of right panel as "
+ mRightPanelWidth + ", "+ mRightPanelHeight);
}
}
});
mViewHolder.mRightPanel.postOnAnimation(new Runnable() {
@Override
public void run() {
if (DEBUG) {
Log.d(TAG, "setTransitionName "+mViewHolder.mOverviewFrame);
}
ViewCompat.setTransitionName(mViewHolder.mOverviewFrame, mSharedElementName);
final TransitionHelper transitionHelper = TransitionHelper.getInstance();
Object transition = transitionHelper.getSharedElementEnterTransition(
mActivityToRunTransition.getWindow());
if (transition != null) {
transitionHelper.setTransitionListener(transition, new TransitionListener() {
@Override
public void onTransitionEnd(Object transition) {
if (DEBUG) {
Log.d(TAG, "onTransitionEnd " + mActivityToRunTransition);
}
// after transition if the action row still focused, transfer
// focus to its children
if (mViewHolder.mActionsRow.isFocused()) {
mViewHolder.mActionsRow.requestFocus();
}
transitionHelper.setTransitionListener(transition, null);
}
});
}
startPostponedEnterTransition();
}
});
}
private void startPostponedEnterTransition() {
if (!mStartedPostpone) {
if (DEBUG) {
Log.d(TAG, "startPostponedEnterTransition " + mActivityToRunTransition);
}
ActivityCompat.startPostponedEnterTransition(mActivityToRunTransition);
mStartedPostpone = true;
}
}
}
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