v11-Prev 5 - Update Window Notification Sample

[DamianSuess]

Feature Includes

• Upgrade Window Notification Manager Pop-Up example
• Breaking change in Avalonia PR 9277 for more information

What Changed

The reason for the change was to provide support for single-view platforms, where a "desktop" window is not available.

Developers can no longer initialize the WindowNotificationManager in the main (shell) window's .axaml.cs, nor pass in main window's instance (this).

New Implementation

The initialization must now be performed in your UserControl's .axaml.cs file. The sample below is borrowed from the SampleMvvmApp which uses a NotificationService

    protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
    {
        base.OnAttachedToVisualTree(e);

        // Initialize the WindowNotificationManager with the "TopLevel" and no longer the MainWindow
        var notifyService = ContainerLocator.Current.Resolve<INotificationService>();
        notifyService.SetHostWindow(TopLevel.GetTopLevel(this));
    }