Avalonia/samples/ControlCatalog/Pages/NotificationsPage.xaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Notifications;
using Avalonia.Interactivity;
using ControlCatalog.ViewModels;

namespace ControlCatalog.Pages
{
    public partial class NotificationsPage : ContentPage
    {
        private NotificationViewModel _viewModel;

        public NotificationsPage()
        {
            InitializeComponent();

            _viewModel = new NotificationViewModel();

            DataContext = _viewModel;
        }

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

            _viewModel.NotificationManager = new WindowNotificationManager(TopLevel.GetTopLevel(this)!);
        }

        private void ShowNotification(object? sender, RoutedEventArgs e)
        {
            ControlNotifications.Show(new Notification
            {
                OnClick = () => ControlNotifications.Show("Notification clicked"),
                Title = "Title",
                Message = "Message"
            });
        }
    }
}