first commit

Nitrox.Launcher/Models/Design/NotificationItem.cs

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+using System.Windows.Input;
+using Avalonia.Controls.Notifications;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using CommunityToolkit.Mvvm.Messaging;
+
+namespace Nitrox.Launcher.Models.Design;
+
+public partial class NotificationItem : ObservableObject
+{
+    public string Message { get; }
+    public NotificationType Type { get; }
+    public ICommand CloseCommand { get; }
+
+    [ObservableProperty]
+    private bool dismissed;
+
+    public NotificationItem()
+    {
+    }
+
+    public NotificationItem(string message, NotificationType type = NotificationType.Information, ICommand closeCommand = null)
+    {
+        Message = message;
+        Type = type;
+        CloseCommand = closeCommand ?? new RelayCommand(() => WeakReferenceMessenger.Default.Send(new NotificationCloseMessage(this)));
+    }
+}