DetailsOverviewSharedElementHelper.java revision 2c016cea6309ccf11b1625259c8b810143cdef88 
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.text.TextUtils;
26import android.util.Log;
27import android.view.View;
28import android.view.ViewGroup;
29import android.view.View.MeasureSpec;
30
31import java.util.List;
32
33final class DetailsOverviewSharedElementHelper extends SharedElementCallback {
34
35    private static final String TAG = "DetailsOverviewSharedElementHelper";
36    private static final boolean DEBUG = false;
37
38    private ViewHolder mViewHolder;
39    private Activity mActivityToRunTransition;
40    private String mSharedElementName;
41    private int mRightPanelWidth;
42    private int mRightPanelHeight;
43
44    @Override
45    public void onSharedElementStart(List<String> sharedElementNames,
46            List<View> sharedElements, List<View> sharedElementSnapshots) {
47        if (sharedElements.size() < 1) {
48            return;
49        }
50        View overviewView = sharedElements.get(0);
51        if (mViewHolder == null || mViewHolder.mOverviewFrame != overviewView) {
52            return;
53        }
54        View imageView = mViewHolder.mImageView;
55        final int width = overviewView.getWidth();
56        final int height = overviewView.getHeight();
57        imageView.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
58                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
59        imageView.layout(0, 0, width, height);
60        final View rightPanel = mViewHolder.mRightPanel;
61        if (mRightPanelWidth != 0 && mRightPanelHeight != 0) {
62            rightPanel.measure(MeasureSpec.makeMeasureSpec(mRightPanelWidth, MeasureSpec.EXACTLY),
63                    MeasureSpec.makeMeasureSpec(mRightPanelHeight, MeasureSpec.EXACTLY));
64            rightPanel.layout(width, rightPanel.getTop(), width + mRightPanelWidth,
65                    rightPanel.getTop() + mRightPanelHeight);
66        } else {
67            rightPanel.offsetLeftAndRight(width - rightPanel.getLeft());
68        }
69        mViewHolder.mActionsRow.setVisibility(View.INVISIBLE);
70        mViewHolder.mDetailsDescriptionFrame.setVisibility(View.INVISIBLE);
71    }
72
73    @Override
74    public void onSharedElementEnd(List<String> sharedElementNames,
75            List<View> sharedElements, List<View> sharedElementSnapshots) {
76        if (sharedElements.size() < 1) {
77            return;
78        }
79        View overviewView = sharedElements.get(0);
80        if (mViewHolder == null || mViewHolder.mOverviewFrame != overviewView) {
81            return;
82        }
83        // temporary let action row take focus so we defer button background animation
84        mViewHolder.mActionsRow.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
85        mViewHolder.mActionsRow.setVisibility(View.VISIBLE);
86        mViewHolder.mActionsRow.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
87        mViewHolder.mDetailsDescriptionFrame.setVisibility(View.VISIBLE);
88    }
89
90    void setSharedElementEnterTransition(Activity activity, String sharedElementName,
91            long timeoutMs) {
92        if (activity == null && !TextUtils.isEmpty(sharedElementName) ||
93                activity != null && TextUtils.isEmpty(sharedElementName)) {
94            throw new IllegalArgumentException();
95        }
96        if (activity == mActivityToRunTransition &&
97                TextUtils.equals(sharedElementName, mSharedElementName)) {
98            return;
99        }
100        if (mActivityToRunTransition != null) {
101            ActivityCompat.setEnterSharedElementCallback(mActivityToRunTransition, null);
102        }
103        mActivityToRunTransition = activity;
104        mSharedElementName = sharedElementName;
105        if (mActivityToRunTransition != null) {
106            ActivityCompat.setEnterSharedElementCallback(mActivityToRunTransition, this);
107            ActivityCompat.postponeEnterTransition(mActivityToRunTransition);
108            if (timeoutMs > 0) {
109                new Handler().postDelayed(new Runnable() {
110                    @Override
111                    public void run() {
112                        if (mActivityToRunTransition == null) {
113                            return;
114                        }
115                        ActivityCompat.startPostponedEnterTransition(mActivityToRunTransition);
116                        mActivityToRunTransition = null;
117                    }
118                }, timeoutMs);
119            }
120        }
121    }
122
123    void onBindToDrawable(ViewHolder vh) {
124        // After we got a image drawable,  we can determine size of right panel.
125        // We want right panel to have fixed size so that the right panel don't change size
126        // when the overview is layout as a small bounds in transition.
127        mViewHolder = vh;
128        mViewHolder.mRightPanel.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
129            @Override
130            public void onLayoutChange(View v, int left, int top, int right, int bottom,
131                    int oldLeft, int oldTop, int oldRight, int oldBottom) {
132                mViewHolder.mRightPanel.removeOnLayoutChangeListener(this);
133                mRightPanelWidth = mViewHolder.mRightPanel.getWidth();
134                mRightPanelHeight = mViewHolder.mRightPanel.getHeight();
135            }
136        });
137        if (mActivityToRunTransition != null) {
138            mViewHolder.mRightPanel.postOnAnimation(new Runnable() {
139                @Override
140                public void run() {
141                    if (mActivityToRunTransition == null) {
142                        return;
143                    }
144                    final TransitionHelper transitionHelper = TransitionHelper.getInstance();
145                    Object transition = transitionHelper.getSharedElementEnterTransition(
146                            mActivityToRunTransition.getWindow());
147                    if (transition != null) {
148                        transitionHelper.setTransitionListener(transition, new TransitionListener() {
149                            @Override
150                            public void onTransitionEnd(Object transition) {
151                                // after transition if the action row still focused, transfer
152                                // focus to its children
153                                if (mViewHolder.mActionsRow.isFocused()) {
154                                    mViewHolder.mActionsRow.requestFocus();
155                                }
156                                transitionHelper.setTransitionListener(transition, null);
157                            }
158                        });
159                    }
160                    ViewCompat.setTransitionName(mViewHolder.mOverviewFrame, mSharedElementName);
161                    ActivityCompat.startPostponedEnterTransition(mActivityToRunTransition);
162                    mActivityToRunTransition = null;
163                    mSharedElementName = null;
164                }
165            });
166        }
167    }
168}
169