Implemented a settings page and settings provider.

Progrart.Browser/Program.cs

@@ -1,15 +1,19 @@
-using System.Runtime.Versioning;
-using System.Threading.Tasks;
-using Avalonia;
+using Avalonia;
 using Avalonia.Browser;
 using Progrart;
+using Progrart.Browser.Settings;
+using System.Threading.Tasks;
 
 internal sealed partial class Program
 {
-    private static Task Main(string[] args) => BuildAvaloniaApp()
-            .WithInterFont()
-            .StartBrowserAppAsync("out");
+	private static Task Main(string[] args)
+	{
+		App.SettingsProvider=new BrowserSettingsProvider();
+		return BuildAvaloniaApp()
+			.WithInterFont()
+			.StartBrowserAppAsync("out");
+	}
 
-    public static AppBuilder BuildAvaloniaApp()
+	public static AppBuilder BuildAvaloniaApp()
         => AppBuilder.Configure<App>();
 }

Progrart.Browser/Settings/BrowserSettingsProvider.cs

@@ -0,0 +1,29 @@
+using Progrart.Core.Settings;
+using System.Runtime.InteropServices.JavaScript;
+using System.Text.Json;
+
+namespace Progrart.Browser.Settings
+{
+	public partial class BrowserSettingsProvider : ISettingsProvider
+	{
+		private SerializeContext context=new SerializeContext();
+		[JSImport("globalThis.localStorage.setItem")]
+		private static partial void SetItem(string key, string value);
+
+		[JSImport("globalThis.localStorage.getItem")]
+		private static partial string GetItem(string key);
+		public AppConfig LoadSettings()
+		{
+			var json = GetItem("progrart.settings");
+			return json != null
+				? JsonSerializer.Deserialize<AppConfig>(json,context.AppConfig)??new AppConfig()
+				: new AppConfig();
+		}
+
+		public void SaveSettings(AppConfig config)
+		{
+			var json = JsonSerializer.Serialize(config,context.AppConfig)??"";
+			SetItem("progrart.settings", json);
+		}
+	}
+}