content: /*
   * Copyright (C) 2014 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.AnimatorListenerAdapter;
  import android.animation.ObjectAnimator;
  import android.animation.RectEvaluator;
  import android.content.Context;
  import android.graphics.Rect;
  import android.util.AttributeSet;
  import android.view.View;
  import android.view.ViewGroup;
  
  /**
   * ChangeClipBounds captures the {@link android.view.View#getClipBounds()} before and after the
   * scene change and animates those changes during the transition.
   */
  public class ChangeClipBounds extends Transition {
  
      private static final String TAG = "ChangeTransform";
  
      private static final String PROPNAME_CLIP = "android:clipBounds:clip";
      private static final String PROPNAME_BOUNDS = "android:clipBounds:bounds";
  
      private static final String[] sTransitionProperties = {
              PROPNAME_CLIP,
      };
  
      public ChangeClipBounds() {}
  
      public ChangeClipBounds(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      @Override
      public String[] getTransitionProperties() {
          return sTransitionProperties;
      }
  
      private void captureValues(TransitionValues values) {
          View view = values.view;
          if (view.getVisibility() == View.GONE) {
              return;
          }
  
          Rect clip = view.getClipBounds();
          values.values.put(PROPNAME_CLIP, clip);
          if (clip == null) {
              Rect bounds = new Rect(0, 0, view.getWidth(), view.getHeight());
              values.values.put(PROPNAME_BOUNDS, bounds);
          }
      }
  
      @Override
      public void captureStartValues(TransitionValues transitionValues) {
          captureValues(transitionValues);
      }
  
      @Override
      public void captureEndValues(TransitionValues transitionValues) {
          captureValues(transitionValues);
      }
  
      @Override
      public Animator createAnimator(final ViewGroup sceneRoot, TransitionValues startValues,
              TransitionValues endValues) {
          if (startValues == null || endValues == null
                  || !startValues.values.containsKey(PROPNAME_CLIP)
                  || !endValues.values.containsKey(PROPNAME_CLIP)) {
              return null;
          }
          Rect start = (Rect) startValues.values.get(PROPNAME_CLIP);
          Rect end = (Rect) endValues.values.get(PROPNAME_CLIP);
          boolean endIsNull = end == null;
          if (start == null && end == null) {
              return null; // No animation required since there is no clip.
          }
  
          if (start == null) {
              start = (Rect) startValues.values.get(PROPNAME_BOUNDS);
          } else if (end == null) {
              end = (Rect) endValues.values.get(PROPNAME_BOUNDS);
          }
          if (start.equals(end)) {
              return null;
          }
  
          endValues.view.setClipBounds(start);
          RectEvaluator evaluator = new RectEvaluator(new Rect());
          ObjectAnimator animator =
                  ObjectAnimator.ofObject(endValues.view, "clipBounds", evaluator, start, end);
          if (endIsNull) {
              final View endView = endValues.view;
              animator.addListener(new AnimatorListenerAdapter() {
                  @Override
                  public void onAnimationEnd(Animator animation) {
                      endView.setClipBounds(null);
                  }
              });
          }
          return animator;
      }
  }
  