public override void AutoFocus()
 {
     Scan.RequestAutoFocus();
 }
 public override void Torch(bool on)
 {
     Scan.RequestTorch(on);
 }
 public override void ToggleTorch()
 {
     Scan.RequestToggleTorch();
 }
 public override void StopScanning()
 {
     Scan.RequestCancel();
 }