1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package android.transition;
17
18import android.animation.Animator;
19import android.animation.ObjectAnimator;
20import android.animation.RectEvaluator;
21import android.content.Context;
22import android.graphics.Rect;
23import android.util.AttributeSet;
24import android.view.View;
25import android.view.ViewGroup;
26
27/**
28 * ChangeClipBounds captures the {@link android.view.View#getClipBounds()} before and after the
29 * scene change and animates those changes during the transition.
30 */
31public class ChangeClipBounds extends Transition {
32
33    private static final String TAG = "ChangeTransform";
34
35    private static final String PROPNAME_CLIP = "android:clipBounds:clip";
36    private static final String PROPNAME_BOUNDS = "android:clipBounds:bounds";
37
38    private static final String[] sTransitionProperties = {
39            PROPNAME_CLIP,
40    };
41
42    public ChangeClipBounds() {}
43
44    public ChangeClipBounds(Context context, AttributeSet attrs) {
45        super(context, attrs);
46    }
47
48    @Override
49    public String[] getTransitionProperties() {
50        return sTransitionProperties;
51    }
52
53    private void captureValues(TransitionValues values) {
54        View view = values.view;
55        if (view.getVisibility() == View.GONE) {
56            return;
57        }
58
59        Rect clip = view.getClipBounds();
60        values.values.put(PROPNAME_CLIP, clip);
61        if (clip == null) {
62            Rect bounds = new Rect(0, 0, view.getWidth(), view.getHeight());
63            values.values.put(PROPNAME_BOUNDS, bounds);
64        }
65    }
66
67    @Override
68    public void captureStartValues(TransitionValues transitionValues) {
69        captureValues(transitionValues);
70    }
71
72    @Override
73    public void captureEndValues(TransitionValues transitionValues) {
74        captureValues(transitionValues);
75    }
76
77    @Override
78    public Animator createAnimator(final ViewGroup sceneRoot, TransitionValues startValues,
79            TransitionValues endValues) {
80        if (startValues == null || endValues == null
81                || !startValues.values.containsKey(PROPNAME_CLIP)
82                || !endValues.values.containsKey(PROPNAME_CLIP)) {
83            return null;
84        }
85        Rect start = (Rect) startValues.values.get(PROPNAME_CLIP);
86        Rect end = (Rect) endValues.values.get(PROPNAME_CLIP);
87        if (start == null && end == null) {
88            return null; // No animation required since there is no clip.
89        }
90
91        if (start == null) {
92            start = (Rect) startValues.values.get(PROPNAME_BOUNDS);
93        } else if (end == null) {
94            end = (Rect) endValues.values.get(PROPNAME_BOUNDS);
95        }
96        if (start.equals(end)) {
97            return null;
98        }
99
100        endValues.view.setClipBounds(start);
101        RectEvaluator evaluator = new RectEvaluator(new Rect());
102        return ObjectAnimator.ofObject(endValues.view, "clipBounds", evaluator, start, end);
103    }
104}
105