Recolor.java revision d82c8ac4db7091d2e976af4c89a1734465d20cd2 
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.ArgbEvaluator;
21import android.animation.ObjectAnimator;
22import android.graphics.drawable.ColorDrawable;
23import android.graphics.drawable.Drawable;
24import android.view.View;
25import android.view.ViewGroup;
26import android.widget.TextView;
27
28/**
29 * This transition tracks changes during scene changes to the
30 * {@link View#setBackground(android.graphics.drawable.Drawable) background}
31 * property of its target views (when the background is a
32 * {@link ColorDrawable}, as well as the
33 * {@link TextView#setTextColor(android.content.res.ColorStateList)
34 * color} of the text for target TextViews. If the color changes between
35 * scenes, the color change is animated.
36 *
37 * @hide
38 */
39public class Recolor extends Transition {
40
41    private static final String PROPNAME_BACKGROUND = "android:recolor:background";
42    private static final String PROPNAME_TEXT_COLOR = "android:recolor:textColor";
43
44    private void captureValues(TransitionValues transitionValues) {
45        transitionValues.values.put(PROPNAME_BACKGROUND, transitionValues.view.getBackground());
46        if (transitionValues.view instanceof TextView) {
47            transitionValues.values.put(PROPNAME_TEXT_COLOR,
48                    ((TextView)transitionValues.view).getCurrentTextColor());
49        }
50    }
51
52    @Override
53    public void captureStartValues(TransitionValues transitionValues) {
54        captureValues(transitionValues);
55    }
56
57    @Override
58    public void captureEndValues(TransitionValues transitionValues) {
59        captureValues(transitionValues);
60    }
61
62    @Override
63    public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues,
64            TransitionValues endValues) {
65        if (startValues == null || endValues == null) {
66            return null;
67        }
68        final View view = endValues.view;
69        Drawable startBackground = (Drawable) startValues.values.get(PROPNAME_BACKGROUND);
70        Drawable endBackground = (Drawable) endValues.values.get(PROPNAME_BACKGROUND);
71        boolean changed = false;
72        if (startBackground instanceof ColorDrawable && endBackground instanceof ColorDrawable) {
73            ColorDrawable startColor = (ColorDrawable) startBackground;
74            ColorDrawable endColor = (ColorDrawable) endBackground;
75            if (startColor.getColor() != endColor.getColor()) {
76                endColor.setColor(startColor.getColor());
77                changed = true;
78                return ObjectAnimator.ofObject(endBackground, "color",
79                        new ArgbEvaluator(), startColor.getColor(), endColor.getColor());
80            }
81        }
82        if (view instanceof TextView) {
83            TextView textView = (TextView) view;
84            int start = (Integer) startValues.values.get(PROPNAME_TEXT_COLOR);
85            int end = (Integer) endValues.values.get(PROPNAME_TEXT_COLOR);
86            if (start != end) {
87                textView.setTextColor(end);
88                changed = true;
89                return ObjectAnimator.ofObject(textView, "textColor",
90                        new ArgbEvaluator(), start, end);
91            }
92        }
93        return null;
94    }
95}
96