DetailsOverviewSharedElementHelper.java revision 72a2146f4c3e6dbb84a5f9f92e7ab42d142dab04 
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.SharedElementListener;
18import android.support.v4.view.ViewCompat;
19import android.support.v17.leanback.widget.DetailsOverviewRowPresenter.ViewHolder;
20
21import android.app.Activity;
22import android.text.TextUtils;
23import android.view.View;
24import android.view.View.MeasureSpec;
25
26import java.util.List;
27
28final class DetailsOverviewSharedElementHelper extends SharedElementListener {
29
30    private ViewHolder mViewHolder;
31    private Activity mActivityToRunTransition;
32    private String mSharedElementName;
33    private int mRightPanelWidth;
34    private int mRightPanelHeight;
35
36    @Override
37    public void setSharedElementStart(List<String> sharedElementNames,
38            List<View> sharedElements, List<View> sharedElementSnapshots) {
39        if (sharedElements.size() < 1) {
40            return;
41        }
42        View overviewView = sharedElements.get(0);
43        if (mViewHolder == null || mViewHolder.mOverviewView != overviewView) {
44            return;
45        }
46        View imageView = mViewHolder.mImageView;
47        final int width = overviewView.getWidth();
48        final int height = overviewView.getHeight();
49        imageView.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
50                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
51        imageView.layout(0, 0, width, height);
52        final View rightPanel = mViewHolder.mRightPanel;
53        if (mRightPanelWidth != 0 && mRightPanelHeight != 0) {
54            rightPanel.measure(MeasureSpec.makeMeasureSpec(mRightPanelWidth, MeasureSpec.EXACTLY),
55                    MeasureSpec.makeMeasureSpec(mRightPanelHeight, MeasureSpec.EXACTLY));
56            rightPanel.layout(width, rightPanel.getTop(), width + mRightPanelWidth,
57                    rightPanel.getTop() + mRightPanelHeight);
58        } else {
59            rightPanel.offsetLeftAndRight(width - rightPanel.getLeft());
60        }
61        mViewHolder.mActionsRow.setVisibility(View.INVISIBLE);
62        mViewHolder.mDetailsDescriptionFrame.setVisibility(View.INVISIBLE);
63    }
64
65    @Override
66    public void setSharedElementEnd(List<String> sharedElementNames,
67            List<View> sharedElements, List<View> sharedElementSnapshots) {
68        if (sharedElements.size() < 1) {
69            return;
70        }
71        View overviewView = sharedElements.get(0);
72        if (mViewHolder == null || mViewHolder.mOverviewView != overviewView) {
73            return;
74        }
75        mViewHolder.mActionsRow.setVisibility(View.VISIBLE);
76        mViewHolder.mDetailsDescriptionFrame.setVisibility(View.VISIBLE);
77    }
78
79    void setSharedElementEnterTransition(Activity activity, String sharedElementName) {
80        if (activity == null && !TextUtils.isEmpty(sharedElementName) ||
81                activity != null && TextUtils.isEmpty(sharedElementName)) {
82            throw new IllegalArgumentException();
83        }
84        if (activity == mActivityToRunTransition &&
85                TextUtils.equals(sharedElementName, mSharedElementName)) {
86            return;
87        }
88        if (mActivityToRunTransition != null) {
89            ActivityCompat.setEnterSharedElementListener(mActivityToRunTransition, null);
90        }
91        mActivityToRunTransition = activity;
92        mSharedElementName = sharedElementName;
93        if (mActivityToRunTransition != null) {
94            ActivityCompat.setEnterSharedElementListener(mActivityToRunTransition, this);
95            ActivityCompat.postponeEnterTransition(mActivityToRunTransition);
96        }
97    }
98
99    void onBindToDrawable(ViewHolder vh) {
100        // After we got a image drawable,  we can determine size of right panel.
101        // We want right panel to have fixed size so that the right panel don't change size
102        // when the overview is layout as a small bounds in transition.
103        mViewHolder = vh;
104        mViewHolder.mRightPanel.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
105            @Override
106            public void onLayoutChange(View v, int left, int top, int right, int bottom,
107                    int oldLeft, int oldTop, int oldRight, int oldBottom) {
108                mViewHolder.mRightPanel.removeOnLayoutChangeListener(this);
109                mRightPanelWidth = mViewHolder.mRightPanel.getWidth();
110                mRightPanelHeight = mViewHolder.mRightPanel.getHeight();
111            }
112        });
113        if (mActivityToRunTransition != null) {
114            mViewHolder.mRightPanel.postOnAnimation(new Runnable() {
115                @Override
116                public void run() {
117                    if (mActivityToRunTransition == null) {
118                        return;
119                    }
120                    ViewCompat.setTransitionName(mViewHolder.mOverviewView, mSharedElementName);
121                    ActivityCompat.startPostponedEnterTransition(mActivityToRunTransition);
122                    mActivityToRunTransition = null;
123                    mSharedElementName = null;
124                }
125            });
126        }
127    }
128}
129