Refactor PLib video library manager to use ReactiveUI, replacing CommunityToolkit.Mvvm. Update dependencies, enhance thumbnail caching logic, and improve UI responsiveness with reactive commands. Remove obsolete PLib.slnx file and update README.md to reflect changes.

src/PLib.Desktop/App.axaml.cs

@@ -1,55 +1,55 @@
-using Avalonia;
-using Avalonia.Controls.ApplicationLifetimes;
-using Avalonia.Markup.Xaml;
-using Avalonia.Threading;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using PLib.Desktop.Controls;
-using PLib.Desktop.Imaging;
-using PLib.Desktop.ViewModels;
-using PLib.Desktop.Views;
-
-namespace PLib.Desktop;
-
-// Fully qualified: the PLib.Application namespace shadows the Application type in this assembly.
-public sealed class App : Avalonia.Application
-{
-    private IHost? _host;
-
-    public override void Initialize() => AvaloniaXamlLoader.Load(this);
-
-    public override void OnFrameworkInitializationCompleted()
-    {
-        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
-        {
-            _host = AppHost.Create(desktop.Args ?? []);
-            _host.Start();
-
-            AsyncImage.Loader = _host.Services.GetRequiredService<ThumbnailCache>();
-
-            var viewModel = _host.Services.GetRequiredService<MainWindowViewModel>();
-            desktop.MainWindow = new MainWindow { DataContext = viewModel };
-            desktop.Exit += OnExit;
-
-            // Kick the first load off once the dispatcher is running, so a failure surfaces
-            // through the view model instead of disappearing into an unobserved task.
-            Dispatcher.UIThread.Post(
-                () => viewModel.InitializeCommand.Execute(null),
-                DispatcherPriority.Background);
-        }
-
-        base.OnFrameworkInitializationCompleted();
-    }
-
-    private void OnExit(object? sender, ControlledApplicationLifetimeExitEventArgs e)
-    {
-        if (_host is null)
-        {
-            return;
-        }
-
-        _host.StopAsync(TimeSpan.FromSeconds(3)).GetAwaiter().GetResult();
-        _host.Dispose();
-        _host = null;
-    }
-}
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using PLib.Desktop.Controls;
+using PLib.Desktop.Imaging;
+using PLib.Desktop.ViewModels;
+using PLib.Desktop.Views;
+
+namespace PLib.Desktop;
+
+// Fully qualified: the PLib.Application namespace shadows the Application type in this assembly.
+public sealed class App : Avalonia.Application
+{
+    private IHost? _host;
+
+    public override void Initialize() => AvaloniaXamlLoader.Load(this);
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            _host = AppHost.Create(desktop.Args ?? []);
+            _host.Start();
+
+            AsyncImage.Loader = _host.Services.GetRequiredService<ThumbnailCache>();
+
+            var viewModel = _host.Services.GetRequiredService<MainWindowViewModel>();
+            desktop.MainWindow = new MainWindow { DataContext = viewModel };
+            desktop.Exit += OnExit;
+
+            // Kick the first load off once the dispatcher is running, so a failure surfaces
+            // through the view model instead of disappearing into an unobserved task.
+            Dispatcher.UIThread.Post(
+                () => viewModel.InitializeCommand.Execute().Subscribe(),
+                DispatcherPriority.Background);
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    private void OnExit(object? sender, ControlledApplicationLifetimeExitEventArgs e)
+    {
+        if (_host is null)
+        {
+            return;
+        }
+
+        _host.StopAsync(TimeSpan.FromSeconds(3)).GetAwaiter().GetResult();
+        _host.Dispose();
+        _host = null;
+    }
+}