public NotifyMessageManager(double screenWidth, double screenHeight, double popupWidth, double popupHeight)
{
MaxPopup = Convert.ToInt32(screenHeight / popupHeight) - 1;
DisplayLocations = new List<AnimatedLocation>(MaxPopup);
DisplayMessages = new NotifyMessageViewModel[MaxPopup];
QueuedMessages = new ConcurrentQueue<NotifyMessage>();
double left = (screenWidth - popupWidth) /2;
double top = 0;
for (int index = 0; index < MaxPopup; index++)
{
if (index == 0)
{
DisplayLocations.Add(new AnimatedLocation(left, left, 0, 0));
}
else
{
var previousLocation = DisplayLocations[index - 1];
DisplayLocations.Add(new AnimatedLocation(
left, left, previousLocation.ToTop, previousLocation.ToTop + popupHeight));
}
}
_isStarted = false;
}
private Task StartService(CancellationToken cancellationToken)
{
var dispatcher = Application.Current.MainWindow.Dispatcher;
Application.Current.MainWindow.Activate();
return Task.Factory.StartNew(() =>
{
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
dispatcher.BeginInvoke(
new MethodInvoker(() =>
{
var window = new NotifyMessageWindow()
{
Owner = Application.Current.MainWindow,
DataContext = viewModel,
ShowInTaskbar = false
};
window.Show();
}), DispatcherPriority.Background);
}
}
Thread.Sleep(1000);
} while (QueuedMessages.Count > 0 && !cancellationToken.IsCancellationRequested);
Stop();
});
}