protected override async void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
this.DataContext = null;
await viewModel.Dispose();
viewModel = null;
rateReminder = null;
base.OnNavigatingFrom(e);
}
private void Setup()
{
viewModel = new MotionDetectorViewModel();
this.DataContext = viewModel;
// As much as I hate doing this, we have to inject the capture element control becase
// the MediaCapture object can't initialize until it has a "Sink" (the capture element)
// to dump images into. However, if you just bind to it, it attempts to initialize
// prior to binding. Chicken and egg problem.
//
// The alternative was to create a ContentControl and bind to a CaptureElement maintained
// in the viewmodel. This sounds worse than just injecting it into the setup function.
viewModel.Setup(captureElementControl);
}
//*****************************************************************************//
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
if (e.Parameter is bool showRateReminder && !showRateReminder)
{
rateReminder = null;
}
App.Current.LeavingBackground += Current_LeavingBackground;
App.Current.EnteredBackground += Current_EnteredBackground;
this.DataContextChanged += DashboardPage_DataContextChanged;
MotionDetectorViewModel viewModel = new MotionDetectorViewModel();
this.DataContext = viewModel;
await viewModel.Setup();
viewModel.caputureSink.HorizontalAlignment = HorizontalAlignment.Stretch;
this.captureElementControl.Content = viewModel.caputureSink;
if (StoreServices.IsPremium)
{
AlertButton.Visibility = Visibility.Visible;
}
}
