protected override void OnElementChanged(ElementChangedEventArgs <ScannerView> e)
{
base.OnElementChanged(e);
FormsView = Element;
if (PlatformView == null)
{
PlatformView = new CPSurfaceView(this.Context)
{
LayoutParameters = new LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent)
};
_cameraAnalyzer = PlatformView.CameraAnalyzer;
PlatformView.SurfaceTextureAvailable += NativeSurface_SurfaceTextureAvailable;
PlatformView.SurfaceTextureDestroyed += NativeSurface_SurfaceTextureDestroyed;
PlatformView.SurfaceTextureSizeChanged += NativeSurface_SurfaceTextureSizeChanged;
base.SetNativeControl(PlatformView);
if (FormsView.IsScanning)
{
PlatformView.StartScanning(FormsView.RaiseScanResult, FormsView.Options);
}
if (!FormsView.IsAnalyzing)
{
PlatformView.PauseAnalysis();
}
}
}
private void Init()
{
if (_cameraAnalyzer == null)
{
_cameraAnalyzer = new CameraAnalyzer(this);
}
_cameraAnalyzer.ResumeAnalysis();
}
public void StartScanning(Action <IScanResult> scanResultCallback, ScanningOptionsBase options = null)
{
//fix Android 7 bug: camera freezes because surfacedestroyed function isn't always called correct, the old surfaceview was still visible.
this.Visibility = ViewStates.Visible;
CameraPreviewSettings.Instance.SetScannerOptions(options);
CameraAnalyzer.ResultFound += (sender, result) => { scanResultCallback?.Invoke(result); };
CameraAnalyzer.ResumeAnalysis();
}
public void ResumeAnalysis()
{
CameraAnalyzer.ResumeAnalysis();
}
public void PauseAnalysis()
{
CameraAnalyzer.PauseAnalysis();
}
public void StopScanning()
{
CameraAnalyzer.ShutdownCamera();
//fix Android 7 bug: camera freezes because surfacedestroyed function isn't always called correct, the old surfaceview was still visible.
this.Visibility = ViewStates.Gone;
}