content: /*
   * Copyright (C) 2018 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.quickstep.util;
  
  import static com.android.quickstep.util.RemoteAnimationProvider.prepareTargetsForFirstFrame;
  import static com.android.systemui.shared.system.RemoteAnimationTargetCompat.MODE_CLOSING;
  
  import android.animation.ValueAnimator;
  import android.animation.ValueAnimator.AnimatorUpdateListener;
  
  import com.android.systemui.shared.system.RemoteAnimationTargetCompat;
  import com.android.systemui.shared.system.TransactionCompat;
  
  /**
   * Animation listener which fades out the closing targets
   */
  public class RemoteFadeOutAnimationListener implements AnimatorUpdateListener {
  
      private final RemoteAnimationTargetSet mTarget;
      private boolean mFirstFrame = true;
  
      public RemoteFadeOutAnimationListener(RemoteAnimationTargetCompat[] targets) {
          mTarget = new RemoteAnimationTargetSet(targets, MODE_CLOSING);
      }
  
      @Override
      public void onAnimationUpdate(ValueAnimator valueAnimator) {
          TransactionCompat t = new TransactionCompat();
          if (mFirstFrame) {
              prepareTargetsForFirstFrame(mTarget.unfilteredApps, t, MODE_CLOSING);
              mFirstFrame = false;
          }
  
          float alpha = 1 - valueAnimator.getAnimatedFraction();
          for (RemoteAnimationTargetCompat app : mTarget.apps) {
              t.setAlpha(app.leash, alpha);
          }
          t.apply();
      }
  }
  