fix: Fix TextBox.Foreground on Skia

src/Uno.UI.Runtime.Skia.Gtk/UI/Xaml/Controls/TextBoxViewExtension.cs

@@ -14,6 +14,7 @@
 using Point = Windows.Foundation.Point;
 using Scale = Pango.Scale;
 using System.Diagnostics;
+using Windows.UI.Xaml.Media;
 
 namespace Uno.UI.Runtime.Skia.GTK.Extensions.UI.Xaml.Controls
 {
@@ -329,5 +330,19 @@ public int GetSelectionLength()
 
 			return 0;
 		}
+
+		public void SetForeground(Windows.UI.Xaml.Media.Brush brush)
+		{
+			if (brush is SolidColorBrush scb)
+			{
+				_currentInputWidget?.OverrideColor(StateFlags.Normal, new Gdk.RGBA
+				{
+					Red = scb.ColorWithOpacity.R,
+					Green = scb.ColorWithOpacity.G,
+					Blue = scb.ColorWithOpacity.B,
+					Alpha = scb.ColorWithOpacity.A
+				});
+			}
+		}
 	}
 }

src/Uno.UI.Runtime.Skia.Wpf/Extensions/UI/Xaml/Controls/Extensions.cs

@@ -0,0 +1,148 @@
+#nullable enable
+
+using System.Linq;
+using System.Diagnostics;
+
+namespace Uno.UI.Runtime.Skia.WPF.Extensions.UI.Xaml.Controls
+{
+	internal static class Extensions
+	{
+		public static System.Windows.Media.Brush? ToWpfBrush(this Windows.UI.Xaml.Media.Brush brush)
+		{
+			if (brush is Windows.UI.Xaml.Media.SolidColorBrush solidBrush)
+			{
+				return new System.Windows.Media.SolidColorBrush(solidBrush.Color.ToWpfColor()) { Opacity = solidBrush.Opacity };
+			}
+			else if (brush is Windows.UI.Xaml.Media.LinearGradientBrush gradientBrush)
+			{
+				return new System.Windows.Media.LinearGradientBrush(gradientBrush.GradientStops.ToWpfGradientStopCollection(), gradientBrush.StartPoint.ToWpfPoint(), gradientBrush.EndPoint.ToWpfPoint())
+				{
+					MappingMode = gradientBrush.MappingMode.ToWpfBrushMappingMode(),
+					Transform = gradientBrush.Transform.ToWpfTransform(),
+					RelativeTransform = gradientBrush.RelativeTransform.ToWpfTransform(),
+				};
+			}
+			else if (brush is Windows.UI.Xaml.Media.ImageBrush imageBrush)
+			{
+				return new System.Windows.Media.ImageBrush(imageBrush.ImageSource.ToWpfImageSource())
+				{
+					AlignmentX = imageBrush.AlignmentX.ToWpfAlignmentX(),
+					AlignmentY = imageBrush.AlignmentY.ToWpfAlignmentY(),
+					Opacity = imageBrush.Opacity,
+					Stretch = imageBrush.Stretch.ToWpfStretch(),
+					Transform = imageBrush.Transform.ToWpfTransform(),
+					RelativeTransform = imageBrush.RelativeTransform.ToWpfTransform(),
+				};
+			}
+
+			// TODO: Support more brushes.
+			return null;
+		}
+
+		private static System.Windows.Media.Color ToWpfColor(this Windows.UI.Color color)
+			=> System.Windows.Media.Color.FromArgb(color.A, color.R, color.G, color.B);
+
+		private static System.Windows.Point ToWpfPoint(this Windows.Foundation.Point point)
+			=> new System.Windows.Point(point.X, point.Y);
+
+		private static System.Windows.Media.GradientStopCollection ToWpfGradientStopCollection(this Windows.UI.Xaml.Media.GradientStopCollection gradientStops)
+			=> new System.Windows.Media.GradientStopCollection(gradientStops.Select(stop => stop.ToWpfGradientStop()));
+
+		private static System.Windows.Media.GradientStop ToWpfGradientStop(this Windows.UI.Xaml.Media.GradientStop gradientStop)
+			=> new System.Windows.Media.GradientStop(gradientStop.Color.ToWpfColor(), gradientStop.Offset);
+
+		private static System.Windows.Media.ImageSource? ToWpfImageSource(this Windows.UI.Xaml.Media.ImageSource imageSource)
+		{
+			if (imageSource is Windows.UI.Xaml.Media.Imaging.BitmapImage bitmapSource)
+			{
+				new System.Windows.Media.Imaging.BitmapImage(bitmapSource.UriSource);
+			}
+
+			// TODO: Support more image sources.
+			return null;
+		}
+
+		private static System.Windows.Media.AlignmentX ToWpfAlignmentX(this Windows.UI.Xaml.Media.AlignmentX alignment)
+		{
+			Debug.Assert((int)System.Windows.Media.AlignmentX.Left == (int)Windows.UI.Xaml.Media.AlignmentX.Left);
+			Debug.Assert((int)System.Windows.Media.AlignmentX.Right == (int)Windows.UI.Xaml.Media.AlignmentX.Right);
+			Debug.Assert((int)System.Windows.Media.AlignmentX.Center == (int)Windows.UI.Xaml.Media.AlignmentX.Center);
+			return (System.Windows.Media.AlignmentX)alignment;
+		}
+
+		private static System.Windows.Media.AlignmentY ToWpfAlignmentY(this Windows.UI.Xaml.Media.AlignmentY alignment)
+		{
+			Debug.Assert((int)System.Windows.Media.AlignmentY.Top == (int)Windows.UI.Xaml.Media.AlignmentY.Top);
+			Debug.Assert((int)System.Windows.Media.AlignmentY.Center == (int)Windows.UI.Xaml.Media.AlignmentY.Center);
+			Debug.Assert((int)System.Windows.Media.AlignmentY.Bottom == (int)Windows.UI.Xaml.Media.AlignmentY.Bottom);
+			return (System.Windows.Media.AlignmentY)alignment;
+		}
+
+		private static System.Windows.Media.Stretch ToWpfStretch(this Windows.UI.Xaml.Media.Stretch stretch)
+		{
+			Debug.Assert((int)System.Windows.Media.Stretch.None == (int)Windows.UI.Xaml.Media.Stretch.None);
+			Debug.Assert((int)System.Windows.Media.Stretch.Fill == (int)Windows.UI.Xaml.Media.Stretch.Fill);
+			Debug.Assert((int)System.Windows.Media.Stretch.Uniform == (int)Windows.UI.Xaml.Media.Stretch.Uniform);
+			Debug.Assert((int)System.Windows.Media.Stretch.UniformToFill == (int)Windows.UI.Xaml.Media.Stretch.UniformToFill);
+			return (System.Windows.Media.Stretch)stretch;
+		}
+
+		private static System.Windows.Media.Transform ToWpfTransform(this Windows.UI.Xaml.Media.Transform transform)
+		{
+			if (transform is Windows.UI.Xaml.Media.MatrixTransform matrixTransform)
+			{
+				return new System.Windows.Media.MatrixTransform(
+					m11: matrixTransform.Matrix.M11,
+					m12: matrixTransform.Matrix.M12,
+					m21: matrixTransform.Matrix.M21,
+					m22: matrixTransform.Matrix.M22,
+					offsetX: matrixTransform.Matrix.OffsetX,
+					offsetY: matrixTransform.Matrix.OffsetY);
+			}
+			else if (transform is Windows.UI.Xaml.Media.RotateTransform rotateTransform)
+			{
+				return new System.Windows.Media.RotateTransform(
+					angle: rotateTransform.Angle,
+					centerX: rotateTransform.CenterX,
+					centerY: rotateTransform.CenterY);
+			}
+			else if (transform is Windows.UI.Xaml.Media.ScaleTransform scaleTransform)
+			{
+				return new System.Windows.Media.ScaleTransform(
+					scaleX: scaleTransform.ScaleX,
+					scaleY: scaleTransform.ScaleY,
+					centerX: scaleTransform.CenterX,
+					centerY: scaleTransform.CenterY);
+			}
+			else if (transform is Windows.UI.Xaml.Media.SkewTransform skewTransform)
+			{
+				return new System.Windows.Media.SkewTransform(
+					angleX: skewTransform.AngleX,
+					angleY: skewTransform.AngleY,
+					centerX: skewTransform.CenterX,
+					centerY: skewTransform.CenterY);
+			}
+			else if (transform is Windows.UI.Xaml.Media.TransformGroup transformGroup)
+			{
+				return new System.Windows.Media.TransformGroup()
+				{
+					Children = new System.Windows.Media.TransformCollection(transformGroup.Children.Select(g => g.ToWpfTransform()))
+				};
+			}
+			else if (transform is Windows.UI.Xaml.Media.TranslateTransform translateTransform)
+			{
+				return new System.Windows.Media.TranslateTransform(translateTransform.X, translateTransform.Y);
+			}
+
+			return null;
+		}
+
+		private static System.Windows.Media.BrushMappingMode ToWpfBrushMappingMode(this Windows.UI.Xaml.Media.BrushMappingMode mappingMode)
+		{
+			Debug.Assert((int)System.Windows.Media.BrushMappingMode.Absolute == (int)Windows.UI.Xaml.Media.BrushMappingMode.Absolute);
+			Debug.Assert((int)System.Windows.Media.BrushMappingMode.RelativeToBoundingBox == (int)Windows.UI.Xaml.Media.BrushMappingMode.RelativeToBoundingBox);
+
+			return (System.Windows.Media.BrushMappingMode)mappingMode;
+		}
+	}
+}

src/Uno.UI.Runtime.Skia.Wpf/Extensions/UI/Xaml/Controls/TextBoxViewExtension.cs

@@ -2,17 +2,13 @@
 
 using System;
 using System.Windows;
-using System.Windows.Media;
-using System.Windows.Threading;
 using Windows.UI.Xaml.Controls;
 using Uno.Disposables;
 using Uno.UI.Runtime.Skia.WPF.Controls;
 using Uno.UI.Skia.Platform;
 using Uno.UI.Xaml.Controls.Extensions;
 using Point = Windows.Foundation.Point;
-using SolidColorBrush = Windows.UI.Xaml.Media.SolidColorBrush;
 using WpfCanvas = System.Windows.Controls.Canvas;
-using WpfTextBox = System.Windows.Controls.TextBox;
 
 namespace Uno.UI.Runtime.Skia.WPF.Extensions.UI.Xaml.Controls
 {
@@ -101,12 +97,7 @@ public void UpdateNativeView()
 			_currentInputWidget.TextWrapping = textBox.AcceptsReturn ? TextWrapping.Wrap : TextWrapping.NoWrap;
 			_currentInputWidget.MaxLength = textBox.MaxLength;
 			_currentInputWidget.IsReadOnly = textBox.IsReadOnly;
-
-			if (textBox.Foreground is SolidColorBrush colorBrush)
-			{
-				var unoColor = colorBrush.Color;
-				_currentInputWidget.Foreground = new System.Windows.Media.SolidColorBrush(Color.FromArgb(unoColor.A, unoColor.R, unoColor.G, unoColor.B));
-			}
+			_currentInputWidget.Foreground = textBox.Foreground.ToWpfBrush();
 		}
 
 		public void UpdateSize()
@@ -193,5 +184,13 @@ public void SetIsPassword(bool isPassword)
 		public int GetSelectionStart() => _currentInputWidget?.SelectionStart ?? 0;
 
 		public int GetSelectionLength() => _currentInputWidget?.SelectionLength ?? 0;
+
+		public void SetForeground(Windows.UI.Xaml.Media.Brush brush)
+		{
+			if (_currentInputWidget != null)
+			{
+				_currentInputWidget.Foreground = brush.ToWpfBrush();
+			}
+		}
 	}
 }

src/Uno.UI/UI/Xaml/Controls/TextBox/ITextBoxExtension.skia.cs

@@ -1,4 +1,5 @@
 using Windows.Foundation;
+using Windows.UI.Xaml.Media;
 
 namespace Uno.UI.Xaml.Controls.Extensions
 {
@@ -23,5 +24,7 @@ internal interface ITextBoxViewExtension
 		int GetSelectionStart();
 
 		int GetSelectionLength();
+
+		void SetForeground(Brush brush);
 	}
 }

src/Uno.UI/UI/Xaml/Controls/TextBox/TextBoxView.skia.cs

@@ -11,7 +11,7 @@ namespace Windows.UI.Xaml.Controls
 {
 	internal class TextBoxView
 	{
-		private readonly ITextBoxViewExtension _textBoxExtension;
+		private readonly ITextBoxViewExtension? _textBoxExtension;
 
 		private readonly WeakReference<TextBox> _textBox;
 		private readonly bool _isPasswordBox;
@@ -54,7 +54,7 @@ public TextBox? TextBox
 		internal void SetTextNative(string text)
 		{
 			// TODO: Inheritance hierarchy is wrong in Uno. PasswordBox shouldn't inherit TextBox.
-			// This needs to be moved to PasswordBox when it's separated from TextBox (likely in Uno 4).
+			// This needs to be moved to PasswordBox if it's separated from TextBox.
 			if (_isPasswordBox && !_isPasswordRevealed)
 			{
 				// TODO: PasswordChar isn't currently implemented. It should be used here when implemented.
@@ -70,10 +70,14 @@ internal void SetTextNative(string text)
 
 		internal void Select(int start, int length)
 		{
-			_textBoxExtension.Select(start, length);
+			_textBoxExtension?.Select(start, length);
 		}
 
-		internal void OnForegroundChanged(Brush brush) => DisplayBlock.Foreground = brush;
+		internal void OnForegroundChanged(Brush brush)
+		{
+			DisplayBlock.Foreground = brush;
+			_textBoxExtension?.SetForeground(brush);
+		}
 
 		internal void OnFocusStateChanged(FocusState focusState)
 		{