public void SetOnPaintTimeObserver(OnPaintTimeObserver observer)
        {
#if ONPAINT_TIME_MEASUREMENT
            _onPaintTimeObserver = observer;
#endif
        }
        public void SetOnPaintTimeObserver(OnPaintTimeObserver observer) {
#if ONPAINT_TIME_MEASUREMENT
            _onPaintTimeObserver = observer;
#endif
        }