content: /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package android.transition;
  
  import android.animation.Animator;
  import android.animation.ObjectAnimator;
  import android.content.Context;
  import android.graphics.drawable.ColorDrawable;
  import android.graphics.drawable.Drawable;
  import android.util.AttributeSet;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.TextView;
  
  /**
   * This transition tracks changes during scene changes to the
   * {@link View#setBackground(android.graphics.drawable.Drawable) background}
   * property of its target views (when the background is a
   * {@link ColorDrawable}, as well as the
   * {@link TextView#setTextColor(android.content.res.ColorStateList)
   * color} of the text for target TextViews. If the color changes between
   * scenes, the color change is animated.
   *
   * @hide
   */
  public class Recolor extends Transition {
  
      private static final String PROPNAME_BACKGROUND = "android:recolor:background";
      private static final String PROPNAME_TEXT_COLOR = "android:recolor:textColor";
  
      public Recolor() {}
  
      public Recolor(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      private void captureValues(TransitionValues transitionValues) {
          transitionValues.values.put(PROPNAME_BACKGROUND, transitionValues.view.getBackground());
          if (transitionValues.view instanceof TextView) {
              transitionValues.values.put(PROPNAME_TEXT_COLOR,
                      ((TextView)transitionValues.view).getCurrentTextColor());
          }
      }
  
      @Override
      public void captureStartValues(TransitionValues transitionValues) {
          captureValues(transitionValues);
      }
  
      @Override
      public void captureEndValues(TransitionValues transitionValues) {
          captureValues(transitionValues);
      }
  
      @Override
      public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues,
              TransitionValues endValues) {
          if (startValues == null || endValues == null) {
              return null;
          }
          final View view = endValues.view;
          Drawable startBackground = (Drawable) startValues.values.get(PROPNAME_BACKGROUND);
          Drawable endBackground = (Drawable) endValues.values.get(PROPNAME_BACKGROUND);
          boolean changed = false;
          if (startBackground instanceof ColorDrawable && endBackground instanceof ColorDrawable) {
              ColorDrawable startColor = (ColorDrawable) startBackground;
              ColorDrawable endColor = (ColorDrawable) endBackground;
              if (startColor.getColor() != endColor.getColor()) {
                  endColor.setColor(startColor.getColor());
                  changed = true;
                  return ObjectAnimator.ofArgb(endBackground, "color", startColor.getColor(),
                          endColor.getColor());
              }
          }
          if (view instanceof TextView) {
              TextView textView = (TextView) view;
              int start = (Integer) startValues.values.get(PROPNAME_TEXT_COLOR);
              int end = (Integer) endValues.values.get(PROPNAME_TEXT_COLOR);
              if (start != end) {
                  textView.setTextColor(end);
                  changed = true;
                  return ObjectAnimator.ofArgb(textView, "textColor", start, end);
              }
          }
          return null;
      }
  }
  