private void updateCameraRunningState(PropertyChangedEventArgs e)
{
if (e.PropertyName == BarcodeScanner.PreviewActiveProperty.PropertyName)
{
if (barcodeScanner.PreviewActive)
{
startSession();
barcodeScanner.OnPreviewActivated();
}
else
{
stopSession();
barcodeScanner.OnPreviewDeactivated();
}
}
if (e.PropertyName == VisualElement.IsEnabledProperty.PropertyName)
{
if (barcodeScanner.IsEnabled)
{
startSession();
barcodeScanner.OnCameraOpened();
}
else
{
stopSession();
barcodeScanner.OnCameraReleased();
}
}
}
protected override void OnElementChanged(ElementChangedEventArgs <View> e)
{
base.OnElementChanged(e);
barcodeScanner = (BarcodeScanner)Element;
if (barcodeScanner == null)
{
return;
}
if (!initScanner())
{
return;
}
view = new UIView(CGRect.Empty);
view.BackgroundColor = UIColor.Gray;
view.Layer.AddSublayer(captureVideoPreviewLayer);
startSession();
barcodeScanner.OnCameraOpened();
barcodeScanner.OnPreviewActivated();
SetNativeControl(view);
}
public void StartPreview(ISurfaceHolder holder)
{
try {
if (!opened)
{
OpenCamera();
return;
}
if (!previewActive)
{
cameraSource?.StartPreview(holder);
if (cameraSource.AutoFocusModeEnabled())
{
cameraSource.AutoFocus(autoFocus);
}
previewActive = true;
}
renderer.OnPreviewActivated();
} catch (Exception ex) {
this.Debug("Unable to start preview.");
this.Debug(ex.ToString());
}
}
