Add core UI

app/InkForge.Desktop/Program.cs

@@ -1,2 +1,78 @@
-// See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");
+using Avalonia;
+using Avalonia.ReactiveUI;
+using Avalonia.Threading;
+
+using InkForge.Common;
+
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+using ReactiveUI;
+
+using Splat;
+using Splat.Microsoft.Extensions.DependencyInjection;
+
+static class Program
+{
+	[STAThread]
+	public static void Main(string[] args)
+		=> BuildAvaloniaApp()
+			.UseMicrosoftExtensionsHosting(args)
+			.StartWithClassicDesktopLifetime(args);
+
+	public static AppBuilder BuildAvaloniaApp()
+		=> AppBuilder.Configure<App>()
+			.UsePlatformDetect()
+			.UseReactiveUI()
+			.LogToTrace();
+
+	private static void ConfigureServices(IServiceCollection services)
+	{
+		services.UseMicrosoftDependencyResolver();
+		var mutableResolver = Locator.CurrentMutable;
+		mutableResolver.InitializeSplat();
+		mutableResolver.InitializeReactiveUI();
+
+		services.AddHttpClient();
+
+		// services.UseFactories();
+		// services.AddViewModelFactory();
+		// services.AddTransient<IViewFor<MainViewModel>, MainWindow>();
+	}
+
+	private static void OnSetup(this HostApplicationBuilder hostBuilder, AppBuilder appBuilder)
+	{
+		var dispatcher = Dispatcher.UIThread;
+
+		var app = appBuilder.Instance!;
+		hostBuilder.Services
+			.AddSingleton(app)
+			.AddSingleton(app.ApplicationLifetime!)
+			.AddSingleton(app.PlatformSettings!)
+			.AddSingleton(dispatcher);
+
+		var host = hostBuilder.Build();
+		host.Services.UseMicrosoftDependencyResolver();
+		app.SetValue(App.HostProperty, host);
+		dispatcher.ShutdownStarted += host.Shutdown;
+
+		dispatcher.Post(static arg =>
+		{
+			var host = (IHost)arg!;
+			host.StartAsync()
+				.GetAwaiter()
+				.GetResult();
+		}, host, DispatcherPriority.Send);
+	}
+
+	private static void Shutdown(this IHost host, object? sender, EventArgs e)
+		=> host.StopAsync().GetAwaiter().GetResult();
+
+	private static AppBuilder UseMicrosoftExtensionsHosting(this AppBuilder builder, string[] args)
+	{
+		var hostBuilder = Host.CreateApplicationBuilder(args);
+		ConfigureServices(hostBuilder.Services);
+		builder.AfterSetup(hostBuilder.OnSetup);
+		return builder;
+	}
+}