@Override
  public String toString() {
    return Objects.toStringHelper(this)
        .add("isAttached", mIsAttached)
        .add("isRequestSubmitted", mIsRequestSubmitted)
        .add("hasFetchFailed", mHasFetchFailed)
        .add("fetchedImage", getImageHash(mFetchedImage))
        .add("events", mEventTracker.toString())
        .toString();
  }
Returns whether the gesture should be handled by the controller
drawee/src/main/java/com/facebook/drawee/controller/AbstractDraweeController.java