Add native OS notifications

src/Decho/App.axaml.cs

@@ -69,6 +69,10 @@ public partial class App : Application
         NotificationSoundService notificationService = new(ConfigManager.Load().Notifications);
         Locator.CurrentMutable.RegisterLazySingleton<NotificationSoundService>(() => notificationService);
 
+        OsNotificationService osNotificationService = new();
+        osNotificationService.Initialize();
+        Locator.CurrentMutable.RegisterLazySingleton<OsNotificationService>(() => osNotificationService);
+
         Locator.CurrentMutable.Register<MainWindowViewModel>(() =>
             new MainWindowViewModel(
                 Locator.Current.GetService<IConnectionService>()!,
@@ -76,6 +80,7 @@ public partial class App : Application
                 Locator.Current.GetService<IUserService>()!,
                 Locator.Current.GetService<IInviteService>()!,
                 Locator.Current.GetService<CommandHandler>()!,
-                Locator.Current.GetService<NotificationSoundService>()!));
+                Locator.Current.GetService<NotificationSoundService>()!,
+                Locator.Current.GetService<OsNotificationService>()!));
     }
 }

src/Decho/Decho.csproj

@@ -25,6 +25,7 @@
     </PackageReference>
     <PackageReference Include="MessageBox.Avalonia" Version="3.2.0" />
     <PackageReference Include="NetCoreAudio" Version="2.0.1" />
+    <PackageReference Include="OsNotifications" Version="1.1.5" />
     <PackageReference Include="Projektanker.Icons.Avalonia.FontAwesome" Version="9.6.2" />
     <PackageReference Include="ReactiveUI.Avalonia" Version="11.3.8" />
     <PackageReference Include="Romzetron.Avalonia" Version="11.3.4" />

src/Decho/Services/OsNotificationService.cs

@@ -0,0 +1,41 @@
+using OsNotifications;
+
+using Serilog;
+
+namespace Decho.Services;
+
+public sealed class OsNotificationService
+{
+    private bool _initialized;
+
+    public void Initialize()
+    {
+        if (_initialized) return;
+        try
+        {
+            Notifications.SetGuiApplication(true);
+            _initialized = true;
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to initialize OS notifications");
+        }
+    }
+
+    public void Show(string title, string? body = null)
+    {
+        if (!_initialized) return;
+        try
+        {
+            Notifications.ShowNotification(title, body ?? string.Empty);
+        }
+        catch (PlatformNotSupportedException ex)
+        {
+            Log.Warning(ex, "OS notifications not supported on this platform");
+        }
+        catch (Exception ex)
+        {
+            Log.Warning(ex, "Failed to show OS notification");
+        }
+    }
+}

src/Decho/ViewModels/MainWindowViewModel.cs

@@ -27,6 +27,7 @@ public sealed class MainWindowViewModel : ViewModelBase
 {
     private readonly CommandHandler _commandHandler;
     private readonly NotificationSoundService _notificationService;
+    private readonly OsNotificationService _osNotificationService;
     private Window? _mainWindow;
 
     public string Title { get; } = "Decho";
@@ -45,7 +46,7 @@ public sealed class MainWindowViewModel : ViewModelBase
 
     public ReactiveCommand<Unit, Unit> AddServerCommand { get; }
 
-    public MainWindowViewModel(IConnectionService connectionService, IChannelService channelService, IUserService userService, IInviteService inviteService, CommandHandler commandHandler, NotificationSoundService notificationService)
+    public MainWindowViewModel(IConnectionService connectionService, IChannelService channelService, IUserService userService, IInviteService inviteService, CommandHandler commandHandler, NotificationSoundService notificationService, OsNotificationService osNotificationService)
     {
         ConnectionService = connectionService;
         ChannelService = channelService;
@@ -53,6 +54,7 @@ public sealed class MainWindowViewModel : ViewModelBase
         InviteService = inviteService;
         _commandHandler = commandHandler;
         _notificationService = notificationService;
+        _osNotificationService = osNotificationService;
 
         Sidebar = new SidebarViewModel();
         Chat = new ChatViewModel();
@@ -725,6 +727,9 @@ public sealed class MainWindowViewModel : ViewModelBase
             if (isMention)
             {
                 _ = _notificationService.PlayAsync();
+                string title = $"@{username} – {new Uri(serverUrl).Host}";
+                string body = $"{message.Author.DisplayName} in #{message.ChannelName}: {message.Content}";
+                _osNotificationService.Show(title, body);
             }
         };