protected override void OnNavigatedTo(bool isInHistory, CompositeDisposable disposables)
{
base.OnNavigatedTo(isInHistory, disposables);
Observable.FromEventPattern <WriteableBitmap>(_qrReader, nameof(_qrReader.NewImageArrived))
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(args =>
{
if (QrImage == null)
{
QrImage = args.EventArgs;
}
else
{
ShowQrCameraDialogView.QrImage?.InvalidateVisual();
}
})
.DisposeWith(disposables);
Observable.FromEventPattern <string>(_qrReader, nameof(_qrReader.CorrectAddressFound))
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(args => Close(DialogResultKind.Normal, args.EventArgs))
.DisposeWith(disposables);
Observable.FromEventPattern <string>(_qrReader, nameof(_qrReader.InvalidAddressFound))
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(args => Message = $"Invalid QR code.")
.DisposeWith(disposables);
Observable.FromEventPattern <Exception>(_qrReader, nameof(_qrReader.ErrorOccured))
.ObserveOn(RxApp.MainThreadScheduler)
.Subscribe(async args =>
{
Close();
await ShowErrorAsync(
Title,
args.EventArgs.Message,
"Something went wrong");
})
.DisposeWith(disposables);
disposables.Add(Disposable.Create(() =>
{
RxApp.MainThreadScheduler.Schedule(async() => await _qrReader.StopScanningAsync());
}));
RxApp.MainThreadScheduler.Schedule(async() => await _qrReader.StartScanningAsync());
}
protected override void OnNavigatedFrom(bool isInHistory)
{
base.OnNavigatedFrom(isInHistory);
RxApp.MainThreadScheduler.Schedule(async() => await _qrReader.StopScanningAsync());
}