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 17 package android.transition; 18 19 import android.animation.Animator; 20 import android.animation.ArgbEvaluator; 21 import android.animation.ObjectAnimator; 22 import android.graphics.drawable.ColorDrawable; 23 import android.graphics.drawable.Drawable; 24 import android.view.View; 25 import android.view.ViewGroup; 26 import 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 */ 39 public 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 captureValues(TransitionValues transitionValues)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 captureStartValues(TransitionValues transitionValues)53 public void captureStartValues(TransitionValues transitionValues) { 54 captureValues(transitionValues); 55 } 56 57 @Override captureEndValues(TransitionValues transitionValues)58 public void captureEndValues(TransitionValues transitionValues) { 59 captureValues(transitionValues); 60 } 61 62 @Override createAnimator(ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues)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