/*
* 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.FullWidthDetailsOverviewRowPresenter.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;
/**
* Helper class to assist delayed shared element activity transition for view created by
* {@link FullWidthDetailsOverviewRowPresenter}. User must call
* {@link #setSharedElementEnterTransition(Activity, String, long)} during activity onCreate() and
* call {@link FullWidthDetailsOverviewRowPresenter#setListener(FullWidthDetailsOverviewRowPresenter.Listener)}.
* The helper implements {@link FullWidthDetailsOverviewRowPresenter.Listener} and starts delayed
* activity transition once {@link FullWidthDetailsOverviewRowPresenter.Listener#onBindLogo(ViewHolder)}
* is called.
*/
public class FullWidthDetailsOverviewSharedElementHelper extends
FullWidthDetailsOverviewRowPresenter.Listener {
private static final String TAG = "FullWidthDetailsOverviewSharedElementHelper";
private static final boolean DEBUG = false;
private static final long DEFAULT_TIMEOUT = 5000;
private ViewHolder mViewHolder;
private Activity mActivityToRunTransition;
private boolean mStartedPostpone;
private String mSharedElementName;
private boolean mAutoStartSharedElementTransition = true;
public void setSharedElementEnterTransition(Activity activity, String sharedElementName) {
setSharedElementEnterTransition(activity, sharedElementName, DEFAULT_TIMEOUT);
}
public 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;
}
mActivityToRunTransition = activity;
mSharedElementName = sharedElementName;
if (DEBUG) {
Log.d(TAG, "postponeEnterTransition " + mActivityToRunTransition);
}
Object transition = TransitionHelper.getInstance()
.getSharedElementEnterTransition(activity.getWindow());
setAutoStartSharedElementTransition(transition != null);
ActivityCompat.postponeEnterTransition(mActivityToRunTransition);
if (timeoutMs > 0) {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
if (DEBUG) {
Log.d(TAG, "timeout " + mActivityToRunTransition);
}
startPostponedEnterTransitionInternal();
}
}, timeoutMs);
}
}
/**
* Enable or disable auto startPostponedEnterTransition() when bound to logo. When it's
* disabled, app must call {@link #startPostponedEnterTransition()} to kick off
* windowEnterTransition. By default, it is disabled when there is no
* windowEnterSharedElementTransition set on the activity.
*/
public void setAutoStartSharedElementTransition(boolean enabled) {
mAutoStartSharedElementTransition = enabled;
}
/**
* Returns true if auto startPostponedEnterTransition() when bound to logo. When it's
* disabled, app must call {@link #startPostponedEnterTransition()} to kick off
* windowEnterTransition. By default, it is disabled when there is no
* windowEnterSharedElementTransition set on the activity.
*/
public boolean getAutoStartSharedElementTransition() {
return mAutoStartSharedElementTransition;
}
@Override
public void onBindLogo(ViewHolder vh) {
if (DEBUG) {
Log.d(TAG, "onBindLogo, could start transition of " + mActivityToRunTransition);
}
mViewHolder = vh;
if (!mAutoStartSharedElementTransition) {
return;
}
if (mViewHolder != null) {
if (DEBUG) {
Log.d(TAG, "rebind? clear transitionName on current viewHolder "
+ mViewHolder.getOverviewView());
}
ViewCompat.setTransitionName(mViewHolder.getLogoViewHolder().view, 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.getDetailsDescriptionFrame().postOnAnimation(new Runnable() {
@Override
public void run() {
if (DEBUG) {
Log.d(TAG, "setTransitionName "+mViewHolder.getOverviewView());
}
ViewCompat.setTransitionName(mViewHolder.getLogoViewHolder().view,
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.getActionsRow().isFocused()) {
mViewHolder.getActionsRow().requestFocus();
}
transitionHelper.setTransitionListener(transition, null);
}
});
}
startPostponedEnterTransitionInternal();
}
});
}
/**
* Manually start postponed enter transition.
*/
public void startPostponedEnterTransition() {
new Handler().post(new Runnable(){
@Override
public void run() {
startPostponedEnterTransitionInternal();
}
});
}
private void startPostponedEnterTransitionInternal() {
if (!mStartedPostpone && mViewHolder != null) {
if (DEBUG) {
Log.d(TAG, "startPostponedEnterTransition " + mActivityToRunTransition);
}
ActivityCompat.startPostponedEnterTransition(mActivityToRunTransition);
mStartedPostpone = true;
}
}
}