DetailsOverviewSharedElementHelper.java revision 2056c3e52465864d60f6f64c16a0a27629ba5fd8 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14package android.support.v17.leanback.widget;
15
16import android.os.Handler;
17import android.support.v4.app.ActivityCompat;
18import android.support.v4.app.SharedElementCallback;
19import android.support.v4.view.ViewCompat;
20import android.support.v17.leanback.R;
21import android.support.v17.leanback.transition.TransitionListener;
22import android.support.v17.leanback.transition.TransitionHelper;
23import android.support.v17.leanback.widget.DetailsOverviewRowPresenter.ViewHolder;
24import android.app.Activity;
25import android.content.Intent;
26import android.graphics.Matrix;
27import android.text.TextUtils;
28import android.util.Log;
29import android.view.View;
30import android.view.ViewGroup;
31import android.view.View.MeasureSpec;
32import android.widget.ImageView;
33import android.widget.ImageView.ScaleType;
34
35import java.lang.ref.WeakReference;
36import java.util.List;
37
38final class DetailsOverviewSharedElementHelper extends SharedElementCallback {
39
40    static final String TAG = "DetailsTransitionHelper";
41    static final boolean DEBUG = false;
42
43    static class TransitionTimeOutRunnable implements Runnable {
44        WeakReference<DetailsOverviewSharedElementHelper> mHelperRef;
45
46        TransitionTimeOutRunnable(DetailsOverviewSharedElementHelper helper) {
47            mHelperRef = new WeakReference<DetailsOverviewSharedElementHelper>(helper);
48        }
49
50        @Override
51        public void run() {
52            DetailsOverviewSharedElementHelper helper = mHelperRef.get();
53            if (helper == null) {
54                return;
55            }
56            if (DEBUG) {
57                Log.d(TAG, "timeout " + helper.mActivityToRunTransition);
58            }
59            helper.startPostponedEnterTransition();
60        }
61    }
62
63    ViewHolder mViewHolder;
64    Activity mActivityToRunTransition;
65    boolean mStartedPostpone;
66    String mSharedElementName;
67    int mRightPanelWidth;
68    int mRightPanelHeight;
69
70    private ScaleType mSavedScaleType;
71    private Matrix mSavedMatrix;
72
73    private boolean hasImageViewScaleChange(View snapshotView) {
74        return snapshotView instanceof ImageView;
75    }
76
77    private void saveImageViewScale() {
78        if (mSavedScaleType == null) {
79            // only save first time after initialize/restoreImageViewScale()
80            ImageView imageView = mViewHolder.mImageView;
81            mSavedScaleType = imageView.getScaleType();
82            mSavedMatrix = mSavedScaleType == ScaleType.MATRIX ? imageView.getMatrix() : null;
83            if (DEBUG) {
84                Log.d(TAG, "saveImageViewScale: "+mSavedScaleType);
85            }
86        }
87    }
88
89    private static void updateImageViewAfterScaleTypeChange(ImageView imageView) {
90        // enforcing imageView to update its internal bounds/matrix immediately
91        imageView.measure(
92                MeasureSpec.makeMeasureSpec(imageView.getMeasuredWidth(), MeasureSpec.EXACTLY),
93                MeasureSpec.makeMeasureSpec(imageView.getMeasuredHeight(), MeasureSpec.EXACTLY));
94        imageView.layout(imageView.getLeft(), imageView.getTop(),
95                imageView.getRight(), imageView.getBottom());
96    }
97
98    private void changeImageViewScale(View snapshotView) {
99        ImageView snapshotImageView = (ImageView) snapshotView;
100        ImageView imageView = mViewHolder.mImageView;
101        if (DEBUG) {
102            Log.d(TAG, "changeImageViewScale to "+snapshotImageView.getScaleType());
103        }
104        imageView.setScaleType(snapshotImageView.getScaleType());
105        if (snapshotImageView.getScaleType() == ScaleType.MATRIX) {
106            imageView.setImageMatrix(snapshotImageView.getImageMatrix());
107        }
108        updateImageViewAfterScaleTypeChange(imageView);
109    }
110
111    private void restoreImageViewScale() {
112        if (mSavedScaleType != null) {
113            if (DEBUG) {
114                Log.d(TAG, "restoreImageViewScale to "+mSavedScaleType);
115            }
116            ImageView imageView = mViewHolder.mImageView;
117            imageView.setScaleType(mSavedScaleType);
118            if (mSavedScaleType == ScaleType.MATRIX) {
119                imageView.setImageMatrix(mSavedMatrix);
120            }
121            // only restore once unless another save happens
122            mSavedScaleType = null;
123            updateImageViewAfterScaleTypeChange(imageView);
124        }
125    }
126
127    @Override
128    public void onSharedElementStart(List<String> sharedElementNames,
129            List<View> sharedElements, List<View> sharedElementSnapshots) {
130        if (DEBUG) {
131            Log.d(TAG, "onSharedElementStart " + mActivityToRunTransition);
132        }
133        if (sharedElements.size() < 1) {
134            return;
135        }
136        View overviewView = sharedElements.get(0);
137        if (mViewHolder == null || mViewHolder.mOverviewFrame != overviewView) {
138            return;
139        }
140        View snapshot = sharedElementSnapshots.get(0);
141        if (hasImageViewScaleChange(snapshot)) {
142            saveImageViewScale();
143            changeImageViewScale(snapshot);
144        }
145        View imageView = mViewHolder.mImageView;
146        final int width = overviewView.getWidth();
147        final int height = overviewView.getHeight();
148        imageView.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
149                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
150        imageView.layout(0, 0, width, height);
151        final View rightPanel = mViewHolder.mRightPanel;
152        if (mRightPanelWidth != 0 && mRightPanelHeight != 0) {
153            rightPanel.measure(MeasureSpec.makeMeasureSpec(mRightPanelWidth, MeasureSpec.EXACTLY),
154                    MeasureSpec.makeMeasureSpec(mRightPanelHeight, MeasureSpec.EXACTLY));
155            rightPanel.layout(width, rightPanel.getTop(), width + mRightPanelWidth,
156                    rightPanel.getTop() + mRightPanelHeight);
157        } else {
158            rightPanel.offsetLeftAndRight(width - rightPanel.getLeft());
159        }
160        mViewHolder.mActionsRow.setVisibility(View.INVISIBLE);
161        mViewHolder.mDetailsDescriptionFrame.setVisibility(View.INVISIBLE);
162    }
163
164    @Override
165    public void onSharedElementEnd(List<String> sharedElementNames,
166            List<View> sharedElements, List<View> sharedElementSnapshots) {
167        if (DEBUG) {
168            Log.d(TAG, "onSharedElementEnd " + mActivityToRunTransition);
169        }
170        if (sharedElements.size() < 1) {
171            return;
172        }
173        View overviewView = sharedElements.get(0);
174        if (mViewHolder == null || mViewHolder.mOverviewFrame != overviewView) {
175            return;
176        }
177        restoreImageViewScale();
178        // temporary let action row take focus so we defer button background animation
179        mViewHolder.mActionsRow.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
180        mViewHolder.mActionsRow.setVisibility(View.VISIBLE);
181        mViewHolder.mActionsRow.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
182        mViewHolder.mDetailsDescriptionFrame.setVisibility(View.VISIBLE);
183    }
184
185    void setSharedElementEnterTransition(Activity activity, String sharedElementName,
186            long timeoutMs) {
187        if (activity == null && !TextUtils.isEmpty(sharedElementName) ||
188                activity != null && TextUtils.isEmpty(sharedElementName)) {
189            throw new IllegalArgumentException();
190        }
191        if (activity == mActivityToRunTransition &&
192                TextUtils.equals(sharedElementName, mSharedElementName)) {
193            return;
194        }
195        if (mActivityToRunTransition != null) {
196            ActivityCompat.setEnterSharedElementCallback(mActivityToRunTransition, null);
197        }
198        mActivityToRunTransition = activity;
199        mSharedElementName = sharedElementName;
200        if (DEBUG) {
201            Log.d(TAG, "postponeEnterTransition " + mActivityToRunTransition);
202        }
203        ActivityCompat.setEnterSharedElementCallback(mActivityToRunTransition, this);
204        ActivityCompat.postponeEnterTransition(mActivityToRunTransition);
205        if (timeoutMs > 0) {
206            new Handler().postDelayed(new TransitionTimeOutRunnable(this), timeoutMs);
207        }
208    }
209
210    void onBindToDrawable(ViewHolder vh) {
211        if (DEBUG) {
212            Log.d(TAG, "onBindToDrawable, could start transition of " + mActivityToRunTransition);
213        }
214        if (mViewHolder != null) {
215            if (DEBUG) {
216                Log.d(TAG, "rebind? clear transitionName on current viewHolder "
217                        + mViewHolder.mOverviewFrame);
218            }
219            ViewCompat.setTransitionName(mViewHolder.mOverviewFrame, null);
220        }
221        // After we got a image drawable,  we can determine size of right panel.
222        // We want right panel to have fixed size so that the right panel don't change size
223        // when the overview is layout as a small bounds in transition.
224        mViewHolder = vh;
225        mViewHolder.mRightPanel.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
226            @Override
227            public void onLayoutChange(View v, int left, int top, int right, int bottom,
228                    int oldLeft, int oldTop, int oldRight, int oldBottom) {
229                mViewHolder.mRightPanel.removeOnLayoutChangeListener(this);
230                mRightPanelWidth = mViewHolder.mRightPanel.getWidth();
231                mRightPanelHeight = mViewHolder.mRightPanel.getHeight();
232                if (DEBUG) {
233                    Log.d(TAG, "onLayoutChange records size of right panel as "
234                            + mRightPanelWidth + ", "+ mRightPanelHeight);
235                }
236            }
237        });
238        mViewHolder.mRightPanel.postOnAnimation(new Runnable() {
239            @Override
240            public void run() {
241                if (DEBUG) {
242                    Log.d(TAG, "setTransitionName "+mViewHolder.mOverviewFrame);
243                }
244                ViewCompat.setTransitionName(mViewHolder.mOverviewFrame, mSharedElementName);
245                Object transition = TransitionHelper.getSharedElementEnterTransition(
246                        mActivityToRunTransition.getWindow());
247                if (transition != null) {
248                    TransitionHelper.addTransitionListener(transition, new TransitionListener() {
249                        @Override
250                        public void onTransitionEnd(Object transition) {
251                            if (DEBUG) {
252                                Log.d(TAG, "onTransitionEnd " + mActivityToRunTransition);
253                            }
254                            // after transition if the action row still focused, transfer
255                            // focus to its children
256                            if (mViewHolder.mActionsRow.isFocused()) {
257                                mViewHolder.mActionsRow.requestFocus();
258                            }
259                            TransitionHelper.removeTransitionListener(transition, this);
260                        }
261                    });
262                }
263                startPostponedEnterTransition();
264            }
265        });
266    }
267
268    void startPostponedEnterTransition() {
269        if (!mStartedPostpone) {
270            if (DEBUG) {
271                Log.d(TAG, "startPostponedEnterTransition " + mActivityToRunTransition);
272            }
273            ActivityCompat.startPostponedEnterTransition(mActivityToRunTransition);
274            mStartedPostpone = true;
275        }
276    }
277}
278