protected override void OnNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e)
{
//we're navigating away from this page, we won't be scanning any barcodes
_scanTimer.Stop();
if (_phoneCamera != null)
{
// Cleanup
_phoneCamera.Dispose();
_phoneCamera.Initialized -= Camera_Initialized;
CameraButtons.ShutterKeyHalfPressed -= CameraButtons_ShutterKeyHalfPressed;
}
if (_scanConfirmation.IsOpen)
{
_scanConfirmation.IsOpen = false;
}
if (OpticalReaderTask.TaskPending)
{
if (e.NavigationMode == NavigationMode.Back)
{
OpticalReaderTask.CancelTask(true);
}
else
{
OpticalReaderTask.CancelTask(false);
}
}
}
void ok_ConfirmationClick(object sender, RoutedEventArgs e)
{
OpticalReaderTask.CompleteTask(_processResult, null);
OpticalReaderTask.TaskPending = false;
_scanConfirmation.IsOpen = false;
NavigationService.GoBack();
}
public OpticalReaderTask()
{
if (_instance == null)
{
_instance = this;
}
else
{
throw new Exception("Only one instance of OpticalReaderTask is supported at a time and another instance already exists.");
}
}
public void Dispose()
{
_instance = null;
}