content: /*
   * Copyright (C) 2012 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.view;
  
  import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
  
  import android.animation.AnimationHandler;
  import android.util.TimeUtils;
  import android.view.animation.AnimationUtils;
  
  import java.util.concurrent.atomic.AtomicReference;
  
  /**
   * Delegate used to provide new implementation of a select few methods of {@link Choreographer}
   *
   * Through the layoutlib_create tool, the original  methods of Choreographer have been
   * replaced by calls to methods of the same name in this delegate class.
   *
   */
  public class Choreographer_Delegate {
      private static final AtomicReference<Choreographer> mInstance = new AtomicReference<Choreographer>();
  
      @LayoutlibDelegate
      public static Choreographer getInstance() {
          if (mInstance.get() == null) {
              mInstance.compareAndSet(null, Choreographer.getInstance_Original());
          }
  
          return mInstance.get();
      }
  
      @LayoutlibDelegate
      public static float getRefreshRate() {
          return 60.f;
      }
  
      @LayoutlibDelegate
      static void scheduleVsyncLocked(Choreographer thisChoreographer) {
          // do nothing
      }
  
      public static void doFrame(long frameTimeNanos) {
          Choreographer thisChoreographer = Choreographer.getInstance();
  
          AnimationUtils.lockAnimationClock(frameTimeNanos / TimeUtils.NANOS_PER_MS);
  
          try {
              thisChoreographer.mLastFrameTimeNanos = frameTimeNanos - thisChoreographer.getFrameIntervalNanos();
              thisChoreographer.mFrameInfo.markInputHandlingStart();
              thisChoreographer.doCallbacks(Choreographer.CALLBACK_INPUT, frameTimeNanos);
  
              thisChoreographer.mFrameInfo.markAnimationsStart();
              thisChoreographer.doCallbacks(Choreographer.CALLBACK_ANIMATION, frameTimeNanos);
  
              thisChoreographer.mFrameInfo.markPerformTraversalsStart();
              thisChoreographer.doCallbacks(Choreographer.CALLBACK_TRAVERSAL, frameTimeNanos);
  
              thisChoreographer.doCallbacks(Choreographer.CALLBACK_COMMIT, frameTimeNanos);
          } finally {
              AnimationUtils.unlockAnimationClock();
          }
      }
  
      public static void clearFrames() {
          Choreographer thisChoreographer = Choreographer.getInstance();
  
          thisChoreographer.removeCallbacks(Choreographer.CALLBACK_INPUT, null, null);
          thisChoreographer.removeCallbacks(Choreographer.CALLBACK_ANIMATION, null, null);
          thisChoreographer.removeCallbacks(Choreographer.CALLBACK_TRAVERSAL, null, null);
          thisChoreographer.removeCallbacks(Choreographer.CALLBACK_COMMIT, null, null);
  
          // Release animation handler instance since it holds references to the callbacks
          AnimationHandler.sAnimatorHandler.set(null);
      }
  
      public static void dispose() {
          clearFrames();
          Choreographer.releaseInstance();
      }
  }
  