private void OnFindImageTimerTick(object sender, EventArgs e)
 {
     if (m_FindImageWatch.ElapsedMilliseconds > k_ImageShowLength)
     {
         m_FindImageTimer.Enabled = false;
         StopInvalidateOnTimer?.Invoke(this);
     }
 }
 private void OnImageCropEnded(Point p)
 {
     StopInvalidateOnTimer?.Invoke(this);
     Invalidate?.Invoke();
 }