DetailsOverviewSharedElementHelper.java revision ceb7ab2ddd6e157cd4ade0f14a382c39428163c4 
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.support.v4.app.ActivityCompat;
17import android.support.v4.app.SharedElementCallback;
18import android.support.v4.view.ViewCompat;
19import android.support.v17.leanback.R;
20import android.support.v17.leanback.transition.TransitionListener;
21import android.support.v17.leanback.transition.TransitionHelper;
22import android.support.v17.leanback.widget.DetailsOverviewRowPresenter.ViewHolder;
23import android.app.Activity;
24import android.text.TextUtils;
25import android.view.View;
26import android.view.ViewGroup;
27import android.view.View.MeasureSpec;
28
29import java.util.List;
30
31final class DetailsOverviewSharedElementHelper extends SharedElementCallback {
32
33    private ViewHolder mViewHolder;
34    private Activity mActivityToRunTransition;
35    private String mSharedElementName;
36    private int mRightPanelWidth;
37    private int mRightPanelHeight;
38
39    @Override
40    public void onSharedElementStart(List<String> sharedElementNames,
41            List<View> sharedElements, List<View> sharedElementSnapshots) {
42        if (sharedElements.size() < 1) {
43            return;
44        }
45        View overviewView = sharedElements.get(0);
46        if (mViewHolder == null || mViewHolder.mOverviewView != overviewView) {
47            return;
48        }
49        View imageView = mViewHolder.mImageView;
50        final int width = overviewView.getWidth();
51        final int height = overviewView.getHeight();
52        imageView.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
53                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
54        imageView.layout(0, 0, width, height);
55        final View rightPanel = mViewHolder.mRightPanel;
56        if (mRightPanelWidth != 0 && mRightPanelHeight != 0) {
57            rightPanel.measure(MeasureSpec.makeMeasureSpec(mRightPanelWidth, MeasureSpec.EXACTLY),
58                    MeasureSpec.makeMeasureSpec(mRightPanelHeight, MeasureSpec.EXACTLY));
59            rightPanel.layout(width, rightPanel.getTop(), width + mRightPanelWidth,
60                    rightPanel.getTop() + mRightPanelHeight);
61        } else {
62            rightPanel.offsetLeftAndRight(width - rightPanel.getLeft());
63        }
64        mViewHolder.mActionsRow.setVisibility(View.INVISIBLE);
65        mViewHolder.mDetailsDescriptionFrame.setVisibility(View.INVISIBLE);
66    }
67
68    @Override
69    public void onSharedElementEnd(List<String> sharedElementNames,
70            List<View> sharedElements, List<View> sharedElementSnapshots) {
71        if (sharedElements.size() < 1) {
72            return;
73        }
74        View overviewView = sharedElements.get(0);
75        if (mViewHolder == null || mViewHolder.mOverviewView != overviewView) {
76            return;
77        }
78        // temporary let action row take focus so we defer button background animation
79        mViewHolder.mActionsRow.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
80        mViewHolder.mActionsRow.setVisibility(View.VISIBLE);
81        mViewHolder.mActionsRow.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
82        mViewHolder.mDetailsDescriptionFrame.setVisibility(View.VISIBLE);
83    }
84
85    void setSharedElementEnterTransition(Activity activity, String sharedElementName) {
86        if (activity == null && !TextUtils.isEmpty(sharedElementName) ||
87                activity != null && TextUtils.isEmpty(sharedElementName)) {
88            throw new IllegalArgumentException();
89        }
90        if (activity == mActivityToRunTransition &&
91                TextUtils.equals(sharedElementName, mSharedElementName)) {
92            return;
93        }
94        if (mActivityToRunTransition != null) {
95            ActivityCompat.setEnterSharedElementCallback(mActivityToRunTransition, null);
96        }
97        mActivityToRunTransition = activity;
98        mSharedElementName = sharedElementName;
99        if (mActivityToRunTransition != null) {
100            ActivityCompat.setEnterSharedElementCallback(mActivityToRunTransition, this);
101            ActivityCompat.postponeEnterTransition(mActivityToRunTransition);
102            TransitionHelper transitionHelper = TransitionHelper.getInstance();
103            Object transition = transitionHelper.getSharedElementEnterTransition(
104                    mActivityToRunTransition.getWindow());
105            if (transition != null) {
106                transitionHelper.setTransitionListener(transition, new TransitionListener() {
107                    @Override
108                    public void onTransitionEnd(Object transition) {
109                        // after transition if the action row still focused, transfer
110                        // focus to its children
111                        if (mViewHolder.mActionsRow.isFocused()) {
112                            mViewHolder.mActionsRow.requestFocus();
113                        }
114                    }
115                });
116            }
117        }
118    }
119
120    void onBindToDrawable(ViewHolder vh) {
121        // After we got a image drawable,  we can determine size of right panel.
122        // We want right panel to have fixed size so that the right panel don't change size
123        // when the overview is layout as a small bounds in transition.
124        mViewHolder = vh;
125        mViewHolder.mRightPanel.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
126            @Override
127            public void onLayoutChange(View v, int left, int top, int right, int bottom,
128                    int oldLeft, int oldTop, int oldRight, int oldBottom) {
129                mViewHolder.mRightPanel.removeOnLayoutChangeListener(this);
130                mRightPanelWidth = mViewHolder.mRightPanel.getWidth();
131                mRightPanelHeight = mViewHolder.mRightPanel.getHeight();
132            }
133        });
134        if (mActivityToRunTransition != null) {
135            mViewHolder.mRightPanel.postOnAnimation(new Runnable() {
136                @Override
137                public void run() {
138                    if (mActivityToRunTransition == null) {
139                        return;
140                    }
141                    ViewCompat.setTransitionName(mViewHolder.mOverviewView, mSharedElementName);
142                    ActivityCompat.startPostponedEnterTransition(mActivityToRunTransition);
143                    mActivityToRunTransition = null;
144                    mSharedElementName = null;
145                }
146            });
147        }
148    }
149}
150