feat: Support for UIElement.ActualSize

src/SamplesApp/UITests.Shared/Windows_UI_ViewManagement/ApplicationViewSpanningRectsPage.xaml.cs

@@ -42,7 +42,7 @@ private void RecalculateRects()
 				return;
 			}
 
-			var canvasRect = new Rect(canvasOrigin, canvas.InternalActualSize);
+			var canvasRect = new Rect(canvasOrigin, canvas.AssignedActualSize);
 
 			var displayRects = spanningRects
 				.Select(r => r.PhysicalToLogicalPixels().IntersectWith(canvasRect))

src/Uno.UI/Generated/3.0.0.0/Windows.UI.Xaml/UIElement.cs

@@ -180,7 +180,7 @@ public  bool UseLayoutRounding
 			}
 		}
 		#endif
-		#if __ANDROID__ || __IOS__ || NET461 || __WASM__ || __SKIA__ || __NETSTD_REFERENCE__ || __MACOS__
+		#if false
 		[global::Uno.NotImplemented("__ANDROID__", "__IOS__", "NET461", "__WASM__", "__SKIA__", "__NETSTD_REFERENCE__", "__MACOS__")]
 		public  global::System.Numerics.Vector2 ActualSize
 		{

src/Uno.UI/Services/LayoutManager.Android.cs

@@ -49,7 +49,7 @@ private static void Arrange()
 				{
 					typeof(LayoutManager).Log().LogDebug($"Measuring {view} with {GetAncestorCount(view)} ancestors in visual tree.");
 				}
-				IFrameworkElementHelper.Measure(view, view.InternalActualSize.Add(view.Margin));
+				IFrameworkElementHelper.Measure(view, view.AssignedActualSize.Add(view.Margin));
 			}
 			foreach (var view in queue)
 			{

src/Uno.UI/UI/Xaml/FrameworkElement.Android.cs

@@ -16,9 +16,6 @@ namespace Windows.UI.Xaml
 	public partial class FrameworkElement
 	{
 		private Size? _lastLayoutSize;
-		private Size _actualSize;
-
-		internal Size InternalActualSize => _actualSize;
 
 		/// <summary>
 		/// The parent of the <see cref="FrameworkElement"/> in the visual tree, which may differ from its <see cref="Parent"/> (ie if it's a child of a native view).
@@ -269,8 +266,8 @@ protected override void OnLayoutCore(bool changed, int left, int top, int right,
 					);
 				}
 
-				var previousSize = _actualSize;
-				_actualSize = newSize;
+				var previousSize = AssignedActualSize;
+				AssignedActualSize = newSize;
 
 				if (
 					// If the layout has changed, but the final size has not, this is just a translation.

src/Uno.UI/UI/Xaml/FrameworkElement.Skia.cs

@@ -13,13 +13,12 @@
 using System.Collections;
 using Microsoft.Extensions.Logging;
 using Uno.UI.Xaml;
+using System.Numerics;
 
 namespace Windows.UI.Xaml
 {
 	public partial class FrameworkElement : IEnumerable
 	{
-		private Size _actualSize;
-
 		private readonly static Thickness _thicknessCache = Thickness.Empty;
 
 		public FrameworkElement()
@@ -37,13 +36,11 @@ public bool HasParent()
 			return Parent != null;
 		}
 
-		internal void SetActualSize(Size size) => _actualSize = size;
+		internal void SetActualSize(Size size) => AssignedActualSize = size;
 
 		public double ActualWidth => GetActualWidth();
-		public double ActualHeight => GetActualHeight();
 
-		private protected virtual double GetActualWidth() => _actualSize.Width;
-		private protected virtual double GetActualHeight() => _actualSize.Height;
+		public double ActualHeight => GetActualHeight();
 
 		partial void OnMeasurePartial(Size slotSize)
 		{

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

@@ -93,8 +93,7 @@ public bool HasParent()
 		{
 			return Parent != null;
 		}
-
-		private Size _actualSize;
+
 		public double ActualWidth => GetActualWidth();
 		public double ActualHeight => GetActualHeight();
 
@@ -106,10 +105,7 @@ internal void RaiseSizeChanged(SizeChangedEventArgs args)
 			_renderTransform?.UpdateSize(args.NewSize);
 		}
 
-		internal void SetActualSize(Size size) => _actualSize = size;
-
-		private protected virtual double GetActualWidth() => _actualSize.Width;
-		private protected virtual double GetActualHeight() => _actualSize.Height;
+		internal void SetActualSize(Size size) => AssignedActualSize = size;
 
 		partial void OnGenericPropertyUpdatedPartial(DependencyPropertyChangedEventArgs args);
 

src/Uno.UI/UI/Xaml/IFrameworkElementImplementation.iOS.tt

@@ -338,8 +338,10 @@ namespace <#= mixin.NamespaceName #>
 		public double ActualWidth => GetActualWidth();
 		public double ActualHeight => GetActualHeight();
 
+#if <#= !mixin.IsUIControl #>
 		private protected virtual double GetActualWidth() => _actualSize.Width;
 		private protected virtual double GetActualHeight() => _actualSize.Height;
+#endif
 
 		private Size _actualSize;
 		public override CGRect Frame
@@ -353,6 +355,9 @@ namespace <#= mixin.NamespaceName #>
 #if <#= mixin.IsFrameworkElement #>
 				RenderSize = _actualSize;
 #endif
+#if <#= mixin.IsUIControl #>
+				AssignedActualSize = _actualSize;
+#endif
 
 				CGAffineTransform? oldTransform = null;
 				if (!Transform.IsIdentity) 

src/Uno.UI/UI/Xaml/IFrameworkElementImplementation.macOS.tt

@@ -340,8 +340,10 @@ namespace <#= mixin.NamespaceName #>
 		public double ActualWidth => GetActualWidth();
 		public double ActualHeight => GetActualHeight();
 
+#if <#= !mixin.IsUIControl #>
 		private protected virtual double GetActualWidth() => _actualSize.Width;
 		private protected virtual double GetActualHeight() => _actualSize.Height;
+#endif
 
 		private Size _actualSize;
 		public override CGRect Frame
@@ -355,7 +357,9 @@ namespace <#= mixin.NamespaceName #>
 #if <#= mixin.IsFrameworkElement #>
 				RenderSize = _actualSize;
 #endif
-
+#if <#= mixin.IsUIControl #>
+				AssignedActualSize = _actualSize;
+#endif
 
 				CoreAnimation.CATransform3D? oldTransform = null;
 				if (Layer != null && !Layer.Transform.IsIdentity) 

src/Uno.UI/UI/Xaml/UIElement.cs

@@ -57,6 +57,14 @@ private void Initialize()
 			this.SetValue(KeyboardAcceleratorsProperty, new List<KeyboardAccelerator>(0), DependencyPropertyValuePrecedences.DefaultValue);
 		}
 
+		public Vector2 ActualSize => new Vector2((float)GetActualWidth(), (float)GetActualHeight());
+
+		internal Size AssignedActualSize { get; set; }
+
+		private protected virtual double GetActualWidth() => AssignedActualSize.Width;
+
+		private protected virtual double GetActualHeight() => AssignedActualSize.Height;
+
 		string IXUidProvider.Uid
 		{
 			get => _uid;