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      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.content.Context;
     22 import android.graphics.drawable.ColorDrawable;
     23 import android.graphics.drawable.Drawable;
     24 import android.util.AttributeSet;
     25 import android.view.View;
     26 import android.view.ViewGroup;
     27 import 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  */
     40 public 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