Merge pull request #19535 from unoplatform/dev/mazi/dnd-init

fix: Drag and Drop initialization on mobile

src/Uno.UI.RuntimeTests/Tests/Uno_UI_Xaml_Core/Given_DragDrop.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Private.Infrastructure;
+
+namespace Uno.UI.RuntimeTests.Tests.Uno_UI_Xaml_Core;
+
+[TestClass]
+public class Given_DragDrop
+{
+#if HAS_UNO // InputManager is internal.
+	[TestMethod]
+	[RunsOnUIThread]
+	public void Verify_Initialized()
+	{
+		var xamlRoot = TestServices.WindowHelper.XamlRoot;
+		var contentRoot = xamlRoot.VisualTree.ContentRoot;
+		Assert.IsNotNull(contentRoot.InputManager.DragDrop);
+	}
+#endif
+}

src/Uno.UI/UI/Xaml/Internal/InputManager.cs

@@ -22,10 +22,6 @@ public InputManager(ContentRoot contentRoot)
 		ConstructKeyboardManager();
 
 		ConstructPointerManager();
-
-#if ANDROID // for some reason, moving InitDragAndDrop to Initialize breaks Android in CI
-		InitDragAndDrop();
-#endif
 	}
 
 	partial void ConstructKeyboardManager();
@@ -39,9 +35,7 @@ internal void Initialize(object host)
 	{
 		InitializeKeyboard(host);
 		InitializePointers(host);
-#if !ANDROID
 		InitDragAndDrop();
-#endif
 	}
 
 	partial void InitializeKeyboard(object host);

src/Uno.UI/UI/Xaml/Window/Window.cs

@@ -240,7 +240,7 @@ internal void Initialize()
 		if (_windowType is WindowType.CoreWindow)
 		{
 			WinUICoreServices.Instance.InitCoreWindowContentRoot();
-#if __WASM__ // We normally call SetHost from the NativeWindowWrapper on DesktopXamlSource targets, but for WASM we put it here.
+#if __WASM__ || __ANDROID__ || __IOS__ // We normally call SetHost from the NativeWindowWrapper on DesktopXamlSource targets, but for WASM we put it here.
 			WinUICoreServices.Instance.MainVisualTree!.ContentRoot.SetHost(this);
 #endif
 		}