@Override
          public void onProgressUpdate(DataSource<T> dataSource) {
            boolean isFinished = dataSource.isFinished();
            float progress = dataSource.getProgress();
            onProgressUpdateInternal(id, dataSource, progress, isFinished);
          }
Returns whether the gesture should be handled by the controller
drawee/src/main/java/com/facebook/drawee/controller/AbstractDraweeController.java