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.ObjectAnimator; 21 import android.annotation.NonNull; 22 import android.annotation.Nullable; 23 import android.content.Context; 24 import android.graphics.drawable.ColorDrawable; 25 import android.graphics.drawable.Drawable; 26 import android.util.AttributeSet; 27 import android.view.View; 28 import android.view.ViewGroup; 29 import android.widget.TextView; 30 31 /** 32 * This transition tracks changes during scene changes to the 33 * {@link View#setBackground(android.graphics.drawable.Drawable) background} 34 * property of its target views (when the background is a 35 * {@link ColorDrawable}, as well as the 36 * {@link TextView#setTextColor(android.content.res.ColorStateList) 37 * color} of the text for target TextViews. If the color changes between 38 * scenes, the color change is animated. 39 * 40 * @hide 41 */ 42 public class Recolor extends Transition { 43 44 private static final String PROPNAME_BACKGROUND = "android:recolor:background"; 45 private static final String PROPNAME_TEXT_COLOR = "android:recolor:textColor"; 46 Recolor()47 public Recolor() {} 48 Recolor(Context context, AttributeSet attrs)49 public Recolor(Context context, AttributeSet attrs) { 50 super(context, attrs); 51 } 52 captureValues(TransitionValues transitionValues)53 private void captureValues(TransitionValues transitionValues) { 54 transitionValues.values.put(PROPNAME_BACKGROUND, transitionValues.view.getBackground()); 55 if (transitionValues.view instanceof TextView) { 56 transitionValues.values.put(PROPNAME_TEXT_COLOR, 57 ((TextView)transitionValues.view).getCurrentTextColor()); 58 } 59 } 60 61 @Override captureStartValues(TransitionValues transitionValues)62 public void captureStartValues(TransitionValues transitionValues) { 63 captureValues(transitionValues); 64 } 65 66 @Override captureEndValues(TransitionValues transitionValues)67 public void captureEndValues(TransitionValues transitionValues) { 68 captureValues(transitionValues); 69 } 70 71 @Nullable 72 @Override createAnimator(@onNull ViewGroup sceneRoot, @Nullable TransitionValues startValues, @Nullable TransitionValues endValues)73 public Animator createAnimator(@NonNull ViewGroup sceneRoot, 74 @Nullable TransitionValues startValues, 75 @Nullable TransitionValues endValues) { 76 if (startValues == null || endValues == null) { 77 return null; 78 } 79 final View view = endValues.view; 80 Drawable startBackground = (Drawable) startValues.values.get(PROPNAME_BACKGROUND); 81 Drawable endBackground = (Drawable) endValues.values.get(PROPNAME_BACKGROUND); 82 boolean changed = false; 83 if (startBackground instanceof ColorDrawable && endBackground instanceof ColorDrawable) { 84 ColorDrawable startColor = (ColorDrawable) startBackground; 85 ColorDrawable endColor = (ColorDrawable) endBackground; 86 if (startColor.getColor() != endColor.getColor()) { 87 endColor.setColor(startColor.getColor()); 88 changed = true; 89 return ObjectAnimator.ofArgb(endBackground, "color", startColor.getColor(), 90 endColor.getColor()); 91 } 92 } 93 if (view instanceof TextView) { 94 TextView textView = (TextView) view; 95 int start = (Integer) startValues.values.get(PROPNAME_TEXT_COLOR); 96 int end = (Integer) endValues.values.get(PROPNAME_TEXT_COLOR); 97 if (start != end) { 98 textView.setTextColor(end); 99 changed = true; 100 return ObjectAnimator.ofArgb(textView, "textColor", start, end); 101 } 102 } 103 return null; 104 } 105 } 106