- tweak: Dependency injection think

Nebula.Launcher/ServiceCollectionExtensions.cs

@@ -0,0 +1,52 @@
+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Threading;
+using Microsoft.Extensions.DependencyInjection;
+using Nebula.Launcher.ViewModels;
+using Nebula.Launcher.Views;
+using Nebula.Launcher.Views.Pages;
+
+namespace Nebula.Launcher;
+
+public static class ServiceCollectionExtensions
+{
+    public static void AddServices(this IServiceCollection services)
+    {
+        services.AddAvaloniaServices();
+        services.AddViews();
+    }
+
+    private static void AddAvaloniaServices(this IServiceCollection services)
+    {
+        services.AddSingleton<IDispatcher>(_ => Dispatcher.UIThread);
+        services.AddSingleton(_ => Application.Current?.ApplicationLifetime ?? throw new InvalidOperationException("No application lifetime is set"));
+
+        services.AddSingleton(sp =>
+            sp.GetRequiredService<IApplicationLifetime>() switch
+            {
+                IClassicDesktopStyleApplicationLifetime desktop => desktop.MainWindow ?? throw new InvalidOperationException("No main window set"),
+                ISingleViewApplicationLifetime singleViewPlatform => TopLevel.GetTopLevel(singleViewPlatform.MainView) ?? throw new InvalidOperationException("Could not find top level element for single view"),
+                _ => throw new InvalidOperationException($"Could not find {nameof(TopLevel)} element"),
+            }
+        );
+
+        services.AddSingleton(sp => sp.GetRequiredService<TopLevel>().StorageProvider);
+    }
+
+    private static void AddViews(this IServiceCollection services)
+    {
+        services.AddTransient<MainWindow>();
+        services.AddView<MainView, MainViewModel>();
+        services.AddView<AccountInfoPage, AccountInfoViewModel>();
+    }
+
+    private static void AddView<TView, TViewModel>(this IServiceCollection services)
+        where TView : class
+        where TViewModel : class
+    {
+        services.AddTransient<TViewModel>();
+        services.AddTransient<TView>();
+    }
+}