1/*
2 * Copyright (C) 2013 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 */
16
17package android.transition;
18
19import android.animation.Animator;
20import android.animation.ObjectAnimator;
21import android.content.Context;
22import android.graphics.drawable.ColorDrawable;
23import android.graphics.drawable.Drawable;
24import android.util.AttributeSet;
25import android.view.View;
26import android.view.ViewGroup;
27import android.widget.TextView;
28
29/**
30 * This transition tracks changes during scene changes to the
31 * {@link View#setBackground(android.graphics.drawable.Drawable) background}
32 * property of its target views (when the background is a
33 * {@link ColorDrawable}, as well as the
34 * {@link TextView#setTextColor(android.content.res.ColorStateList)
35 * color} of the text for target TextViews. If the color changes between
36 * scenes, the color change is animated.
37 *
38 * @hide
39 */
40public class Recolor extends Transition {
41
42    private static final String PROPNAME_BACKGROUND = "android:recolor:background";
43    private static final String PROPNAME_TEXT_COLOR = "android:recolor:textColor";
44
45    public Recolor() {}
46
47    public Recolor(Context context, AttributeSet attrs) {
48        super(context, attrs);
49    }
50
51    private void captureValues(TransitionValues transitionValues) {
52        transitionValues.values.put(PROPNAME_BACKGROUND, transitionValues.view.getBackground());
53        if (transitionValues.view instanceof TextView) {
54            transitionValues.values.put(PROPNAME_TEXT_COLOR,
55                    ((TextView)transitionValues.view).getCurrentTextColor());
56        }
57    }
58
59    @Override
60    public void captureStartValues(TransitionValues transitionValues) {
61        captureValues(transitionValues);
62    }
63
64    @Override
65    public void captureEndValues(TransitionValues transitionValues) {
66        captureValues(transitionValues);
67    }
68
69    @Override
70    public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues,
71            TransitionValues endValues) {
72        if (startValues == null || endValues == null) {
73            return null;
74        }
75        final View view = endValues.view;
76        Drawable startBackground = (Drawable) startValues.values.get(PROPNAME_BACKGROUND);
77        Drawable endBackground = (Drawable) endValues.values.get(PROPNAME_BACKGROUND);
78        boolean changed = false;
79        if (startBackground instanceof ColorDrawable && endBackground instanceof ColorDrawable) {
80            ColorDrawable startColor = (ColorDrawable) startBackground;
81            ColorDrawable endColor = (ColorDrawable) endBackground;
82            if (startColor.getColor() != endColor.getColor()) {
83                endColor.setColor(startColor.getColor());
84                changed = true;
85                return ObjectAnimator.ofArgb(endBackground, "color", startColor.getColor(),
86                        endColor.getColor());
87            }
88        }
89        if (view instanceof TextView) {
90            TextView textView = (TextView) view;
91            int start = (Integer) startValues.values.get(PROPNAME_TEXT_COLOR);
92            int end = (Integer) endValues.values.get(PROPNAME_TEXT_COLOR);
93            if (start != end) {
94                textView.setTextColor(end);
95                changed = true;
96                return ObjectAnimator.ofArgb(textView, "textColor", start, end);
97            }
98        }
99        return null;
100    }
101}
102