private async void OnResuming(object sender, object e)
{
await SharedState.LogAsync("Scannit: RESUMING!");
await SharedState.SetAsync(SharedState.IsApplicationInForeground, true);
await Scanner.StartScanner();
}
protected override async void OnLaunched(LaunchActivatedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
// Do not repeat app initialization when the Window already has content,
// just ensure that the window is active
if (rootFrame == null)
{
// Create a Frame to act as the navigation context and navigate to the first page
rootFrame = new Frame();
rootFrame.NavigationFailed += OnNavigationFailed;
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: Load state from previously suspended application
}
// Place the frame in the current Window
Window.Current.Content = rootFrame;
}
if (e.PrelaunchActivated == false)
{
if (rootFrame.Content == null)
{
// When the navigation stack isn't restored navigate to the first page,
// configuring the new page by passing required information as a navigation
// parameter
rootFrame.Navigate(typeof(MainPage), e.Arguments);
}
// Ensure the current window is active
SystemNavigationManager.GetForCurrentView().BackRequested += App_BackRequested;
Window.Current.Activate();
}
// If we were suspended, Resuming will fire and take care of this
if (e.PreviousExecutionState != ApplicationExecutionState.Suspended)
{
await SharedState.SetAsync(SharedState.IsApplicationInForeground, true);
await Scanner.StartScanner();
}
}
private async void Reader_CardAdded(SmartCardReader sender, CardAddedEventArgs args)
{
await SharedState.LogAsync($"BackgroundScanner ({_taskInstance.InstanceId}): CardAdded event fired.");
try
{
TravelCard card = await CardOperations.ReadTravelCardAsync(args.SmartCard);
if (card != null)
{
await SharedState.LogAsync($"BackgroundScanner ({_taskInstance.InstanceId}): Successful read card.");
Task updateCardTask = SharedState.SetAsync(SharedState.LastSeenCard, card.RawValues);
await SharedState.LogAsync($"BackgroundScanner ({_taskInstance.InstanceId}): LastSeenCard updated.");
Task updateTimestampTask = SharedState.SetAsync(SharedState.LastSeenTimestamp, DateTimeOffset.UtcNow);
await SharedState.LogAsync($"BackgroundScanner ({_taskInstance.InstanceId}): LastSeenTimestamp updated.");
if (await SharedState.GetAsync <bool>(SharedState.IsApplicationInForeground))
{
await SharedState.LogAsync($"BackgroundScanner ({_taskInstance.InstanceId}): Application is in the foreground. Changed Progress value.");
_taskInstance.Progress = 2;
}
else
{
await SharedState.LogAsync($"BackgroundScanner ({_taskInstance.InstanceId}): Application is in the background. Post toast notification.");
PostToastNotification(card);
}
}
}
catch (Exception ex)
{
await SharedState.LogAsync($"BackgroundScanner ({_taskInstance.InstanceId}): Failed to read travel card! Exception: {ex}\nStack trace: {ex.StackTrace}");
}
}
private async void OnSuspending(object sender, SuspendingEventArgs e)
{
SuspendingDeferral deferral = e.SuspendingOperation.GetDeferral();
var newSession = new ExtendedExecutionSession
{
Reason = ExtendedExecutionReason.SavingData
};
newSession.Revoked += NewSession_Revoked;
ExtendedExecutionResult result = await newSession.RequestExtensionAsync();
if (result == ExtendedExecutionResult.Allowed)
{
await SharedState.LogAsync("Scannit: SUSPENDING!");
await SharedState.SetAsync(SharedState.IsApplicationInForeground, false);
newSession.Revoked -= NewSession_Revoked;
newSession.Dispose();
newSession = null;
}
deferral.Complete();
}