public QrScannerForm(
QrScannerFormView view,
string title, string label,
Func <string, Task <T> > getItemByCode,
int scannerPopupMmFromTop = 15,
int scannerPopupHeightMm = 40)
{
_view = view;
_view.Label = label;
_view.PadMmFromTop = scannerPopupMmFromTop;
_scannerPopupMmFromTop = scannerPopupMmFromTop;
_view.HeightMm = scannerPopupHeightMm;
_scannerPopupHeightMm = scannerPopupHeightMm;
_title = title;
_getItemByCode = getItemByCode;
LocalActionBuilder.Build(_view.Unpause, async() => {
_view.Unpause.Widget.Style.Display = Display.None;
await _errorLbl.DoChange("", false, this, false);
_hndl?.ResumeScanning();
});
LocalActionBuilder.Build(_view.Cancel, () => _hndl?.CancelScanning());
_errorLbl = LocalValueFieldBuilder.Build(_view.Error);
}
private async Task HandleScanning()
{
_hndl = IawAppApi.RequestScanQr(
true,
new MatchWidthWithFixedHeightLayoutStrategy(
_scannerPopupHeightMm, _scannerPopupMmFromTop));
var ended = false;
while (!ended)
{
var ev = await _hndl.GetNext();
Logger.Debug(GetType(), "got ({0}; {1})", ev.Item1, ev.Item2);
switch (ev.Item1)
{
case ScanResultType.Scanned:
try {
_errorOrNull = null;
ScannedCode = await _getItemByCode(ev.Item2);
} catch (Exception ex) {
_errorOrNull = ex.Message;
}
await _errorLbl.DoChange(_errorOrNull, false, this, false);
break;
case ScanResultType.Paused:
if (_errorOrNull == null)
{
_hndl.CancelScanning();
}
else
{
//TODO extract into stylesheet
_view.Unpause.Widget.Style.SetProperty("display", "");
}
break;
case ScanResultType.Disposed:
_hndl = null;
ended = true;
Ended?.Invoke(this,
ScannedCode == null ? CompletedOrCanceled.Canceled : CompletedOrCanceled.Completed);
break;
}
}
}
