content: /*
   * Copyright (C) 2016 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 com.android.launcher3.anim;
  
  import android.animation.Animator;
  import android.animation.AnimatorListenerAdapter;
  import android.util.ArrayMap;
  import android.view.View;
  import java.util.Iterator;
  import java.util.Map;
  
  /**
   * Helper class to automatically build view hardware layers for the duration of an animation.
   */
  public class AnimationLayerSet extends AnimatorListenerAdapter {
  
      private final ArrayMap<View, Integer> mViewsToLayerTypeMap;
  
      public AnimationLayerSet() {
          mViewsToLayerTypeMap = new ArrayMap<>();
      }
  
      public AnimationLayerSet(View v) {
          mViewsToLayerTypeMap = new ArrayMap<>(1);
          addView(v);
      }
  
      public void addView(View v) {
          mViewsToLayerTypeMap.put(v, v.getLayerType());
      }
  
      @Override
      public void onAnimationStart(Animator animation) {
          // Enable all necessary layers
          Iterator<Map.Entry<View, Integer>> itr = mViewsToLayerTypeMap.entrySet().iterator();
          while (itr.hasNext()) {
              Map.Entry<View, Integer> entry = itr.next();
              View v = entry.getKey();
              entry.setValue(v.getLayerType());
              v.setLayerType(View.LAYER_TYPE_HARDWARE, null);
              if (v.isAttachedToWindow() && v.getVisibility() == View.VISIBLE) {
                  v.buildLayer();
              }
          }
      }
  
      @Override
      public void onAnimationEnd(Animator animation) {
          Iterator<Map.Entry<View, Integer>> itr = mViewsToLayerTypeMap.entrySet().iterator();
          while (itr.hasNext()) {
              Map.Entry<View, Integer> entry = itr.next();
              entry.getKey().setLayerType(entry.getValue(), null);
          }
      }
  }
  