feat: Initialize WindowManager asynchronously

src/Uno.UI/UI/Xaml/Application.wasm.cs

@@ -13,6 +13,7 @@
 using Uno.Extensions;
 using Uno.Foundation.Logging;
 using System.Threading;
+using System.Threading.Tasks;
 using Uno.UI;
 using Uno.UI.Xaml;
 using Uno;
@@ -84,19 +85,31 @@ public static int DispatchVisibilityChange(bool isVisible)
 			return 0;
 		}
 
-		static partial void StartPartial(ApplicationInitializationCallback callback)
+		static async partial void StartPartial(ApplicationInitializationCallback callback)
 		{
-			_startInvoked = true;
+			try
+			{
+				_startInvoked = true;
+
+				SynchronizationContext.SetSynchronizationContext(
+					new CoreDispatcherSynchronizationContext(CoreDispatcher.Main, CoreDispatcherPriority.Normal)
+				);
 
-			var isLoadEventsEnabled = !FeatureConfiguration.FrameworkElement.WasmUseManagedLoadedUnloaded;
-			WindowManagerInterop.Init(isLoadEventsEnabled);
-			Windows.Storage.ApplicationData.Init();
+				var isLoadEventsEnabled = !FeatureConfiguration.FrameworkElement.WasmUseManagedLoadedUnloaded;
 
-			SynchronizationContext.SetSynchronizationContext(
-				new CoreDispatcherSynchronizationContext(CoreDispatcher.Main, CoreDispatcherPriority.Normal)
-			);
+				await WindowManagerInterop.InitAsync(isLoadEventsEnabled);
 
-			callback(new ApplicationInitializationCallbackParams());
+				Windows.Storage.ApplicationData.Init();
+
+				callback(new ApplicationInitializationCallbackParams());
+			}
+			catch (Exception exception)
+			{
+				if (typeof(Application).Log().IsEnabled(LogLevel.Error))
+				{
+					typeof(Application).Log().LogError("Application initialization failed.", exception);
+				}
+			}
 		}
 
 		partial void ObserveSystemThemeChanges()

src/Uno.UI/UI/Xaml/WindowManagerInterop.wasm.cs

@@ -27,25 +27,13 @@ internal partial class WindowManagerInterop
 		//When users set double.MaxValue to scroll to the end of the page Javascript doesn't scroll.
 		private const double MAX_SCROLLING_OFFSET = 1_000_000_000_000_000_000;
 
-		#region Init
-		internal static void Init(bool isLoadEventsEnabled)
-		{
-			var parms = new WindowManagerInitParams
-			{
-				IsLoadEventsEnabled = isLoadEventsEnabled
-			};
-
-			TSInteropMarshaller.InvokeJS("UnoStatic:initNative", parms);
-		}
-
-		[TSInteropMessage]
-		[StructLayout(LayoutKind.Sequential, Pack = 4)]
-		private struct WindowManagerInitParams
-		{
-			public bool IsLoadEventsEnabled;
-		}
-
-		#endregion
+		internal static Task InitAsync(bool isLoadEventsEnabled)
+			=>
+#if NET7_0_OR_GREATER
+				NativeMethods.InitAsync(isLoadEventsEnabled);
+#else
+				WebAssemblyRuntime.InvokeAsync($"Uno.UI.WindowManager.init({(isLoadEventsEnabled ? "true" : "false")})");
+#endif
 
 		internal static string FindLaunchArguments()
 			=>
@@ -1314,6 +1302,9 @@ internal static partial void ArrangeElement(
 			[JSImport("globalThis.Uno.UI.WindowManager.current.getProperty")]
 			internal static partial string GetProperty(IntPtr htmlId, string name);
 
+			[JSImport("globalThis.Uno.UI.WindowManager.init")]
+			internal static partial Task InitAsync(bool isLoadEventsEnabled);
+
 			[JSImport("globalThis.Uno.UI.WindowManager.current.measureViewNativeFast")]
 			internal static partial void MeasureView(IntPtr htmlId, double availableWidth, double availableHeight, bool measureContent, IntPtr pReturn);
 

src/Uno.UI/ts/MonoSupport.ts

@@ -29,7 +29,6 @@ namespace MonoSupport {
 			}
 			else {
 				if (!jsCallDispatcher._isUnoRegistered) {
-					jsCallDispatcher.registerScope("UnoStatic", Uno.UI.WindowManager);
 					jsCallDispatcher.registerScope("UnoStatic_Windows_Storage_StorageFolder", Windows.Storage.StorageFolder);
 					jsCallDispatcher.registerScope("UnoStatic_Windows_Storage_ApplicationDataContainer", Windows.Storage.ApplicationDataContainer);
 					jsCallDispatcher.registerScope("UnoStatic_Windows_ApplicationModel_DataTransfer_DragDrop_Core_DragDropExtension", Windows.ApplicationModel.DataTransfer.DragDrop.Core.DragDropExtension);

src/Uno.UI/ts/WindowManager.ts

@@ -20,17 +20,16 @@ namespace Uno.UI {
 		private static readonly unoUnarrangedClassName = "uno-unarranged";
 		private static readonly unoCollapsedClassName = "uno-visibility-collapsed";
 
-		private static _cctor = (() => {
-			WindowManager.initMethods();
-			HtmlDom.initPolyfills();
-		})();
-
 		/**
 			* Initialize the WindowManager
 			* @param containerElementId The ID of the container element for the Xaml UI
 			* @param loadingElementId The ID of the loading element to remove once ready
 			*/
-		public static init(isLoadEventsEnabled: boolean, containerElementId: string = "uno-body", loadingElementId: string = "uno-loading"): void {
+		public static async init(isLoadEventsEnabled: boolean, containerElementId: string = "uno-body", loadingElementId: string = "uno-loading") {
+
+			HtmlDom.initPolyfills();
+
+			await WindowManager.initMethods();
 
 			WindowManager._isLoadEventsEnabled = isLoadEventsEnabled;
 
@@ -48,7 +47,7 @@ namespace Uno.UI {
 		private static buildReadyPromise(): Promise<boolean> {
 			return new Promise<boolean>(resolve => {
 				Promise.all(
-					[WindowManager.buildSplashScreen(), ExportManager.initialize()]
+					[WindowManager.buildSplashScreen()]
 				).then(() => resolve(true))
 			});
 		}
@@ -112,20 +111,6 @@ namespace Uno.UI {
 			});
 		}
 
-		/**
-			* Initialize the WindowManager
-			* @param containerElementId The ID of the container element for the Xaml UI
-			* @param loadingElementId The ID of the loading element to remove once ready
-			*/
-		public static initNative(pParams: number): boolean {
-
-			const params = WindowManagerInitParams.unmarshal(pParams);
-
-			WindowManager.init(params.IsLoadEventsEnabled);
-
-			return true;
-		}
-
 		private containerElement: HTMLDivElement;
 		private rootElement: HTMLElement;
 
@@ -1582,7 +1567,10 @@ namespace Uno.UI {
 			);
 		}
 
-		private static initMethods() {
+		private static async initMethods() {
+
+			await ExportManager.initialize();
+
 			if (!WindowManager.resizeMethod) {
 				WindowManager.resizeMethod = (<any>Module).mono_bind_static_method("[Uno.UI] Windows.UI.Xaml.Window:Resize");
 			}