private Task StartService(CancellationToken cancellationToken)
{
try
{
var dispatcher = Application.Current.MainWindow.Dispatcher;
return(Task.Factory.StartNew(async() =>
{
do
{
// Gets the next display location in the screen
int nextLocation = FindNextLocation();
if (nextLocation > -1)
{
NotifyMessage msg = null;
// Retrieve the message from the queue
if (QueuedMessages.TryDequeue(out msg))
{
// construct a View Model and binds it to the Popup Window
var viewModel = new NotifyMessageViewModel(msg,
DisplayLocations[nextLocation],
() => DisplayMessages[nextLocation] = null); // Free the display location when the popup window is closed
DisplayMessages[nextLocation] = viewModel;
// Use Application.Current.MainWindow.Dispatcher to switch back to the UI Thread to create popup window
await dispatcher.BeginInvoke(
new MethodInvoker(() =>
{
var window = new AlertDialog()
{
Owner = Application.Current.MainWindow,
DataContext = viewModel,
ShowInTaskbar = false
};
window.Show();
}), DispatcherPriority.Background);
}
}
await Task.Delay(1000);
} while (QueuedMessages.Count > 0 && !cancellationToken.IsCancellationRequested);
Stop();
}));
}
catch
{
return(null);
}
}
public void EnqueueMessage(NotifyMessage msg)
{
QueuedMessages.Enqueue(msg);
Start();
}
public NotifyMessageViewModel(NotifyMessage content, AnimatedLocation location, Action closedAction)
{
this.content = content;
this.location = location;
this.closedAction = closedAction;
}