content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.weex;
  
  /**
   * Created by shiwentao on 2017/8/24.
   */
  
  import android.annotation.SuppressLint;
  import android.os.Build;
  import android.util.Log;
  import android.view.Choreographer;
  import org.apache.weex.common.WXErrorCode;
  import java.lang.ref.WeakReference;
  
  public class WeexFrameRateControl {
      private static final long VSYNC_FRAME = 1000 / 60;
      private WeakReference<VSyncListener> mListener;
      private final Choreographer mChoreographer;
      private final Choreographer.FrameCallback mVSyncFrameCallback;
      private final Runnable runnable;
  
      public interface VSyncListener {
          void OnVSync();
      }
  
      public WeexFrameRateControl(VSyncListener listener) {
          mListener = new WeakReference<>(listener);
          if (Build.VERSION.SDK_INT > Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
              mChoreographer = Choreographer.getInstance();
              mVSyncFrameCallback = new Choreographer.FrameCallback() {
                  @SuppressLint("NewApi")
                  @Override
                  public void doFrame(long frameTimeNanos) {
                      VSyncListener vSyncListener;
                      if (mListener != null && (vSyncListener=mListener.get()) != null) {
                          try {
                              vSyncListener.OnVSync();
                              mChoreographer.postFrameCallback(mVSyncFrameCallback);
                          }catch (UnsatisfiedLinkError e){
                              if(vSyncListener instanceof WXSDKInstance){
                                  ((WXSDKInstance) vSyncListener).onRenderError(
                                      WXErrorCode.WX_DEGRAD_ERR_INSTANCE_CREATE_FAILED.getErrorCode(),
                                      Log.getStackTraceString(e));
                              }
                          }
                      }
                  }
              };
              runnable = null;
          } else {
              // For API 15 or lower
              runnable = new Runnable() {
                  @Override
                  public void run() {
                      VSyncListener vSyncListener;
                      if (mListener != null && (vSyncListener = mListener.get()) != null) {
                          try {
                              vSyncListener.OnVSync();
                              WXSDKManager.getInstance().getWXRenderManager().postOnUiThread(runnable, VSYNC_FRAME);
                          }catch (UnsatisfiedLinkError e){
                              if(vSyncListener instanceof WXSDKInstance){
                                  ((WXSDKInstance) vSyncListener).onRenderError(
                                      WXErrorCode.WX_DEGRAD_ERR_INSTANCE_CREATE_FAILED.getErrorCode(),
                                      Log.getStackTraceString(e));
                              }
                          }
                      }
                  }
              };
              mChoreographer = null;
              mVSyncFrameCallback = null;
          }
      }
  
      @SuppressLint("NewApi")
      public void start() {
          if (mChoreographer != null) {
              mChoreographer.postFrameCallback(mVSyncFrameCallback);
          }
          else if(runnable!=null){
              WXSDKManager.getInstance().getWXRenderManager().postOnUiThread(runnable, VSYNC_FRAME);
          }
      }
  
      @SuppressLint("NewApi")
      public void stop() {
          if (mChoreographer != null) {
              mChoreographer.removeFrameCallback(mVSyncFrameCallback);
          }else if(runnable!=null){
              WXSDKManager.getInstance().getWXRenderManager().removeTask(runnable);
          }
      }
  }
  