添加项目文件。

Wpf.Ui.Extend/Converters/SliderValueLabelPositionConverter.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Globalization;
+using System.Windows.Controls;
+using System.Windows.Data;
+
+namespace Wpf.Ui.Extend.Converters;
+
+/// <summary>
+/// 滑动块标签位置
+/// </summary>
+[ValueConversion(typeof(double), typeof(double), ParameterType = typeof(Orientation))]
+internal class SliderValueLabelPositionConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        if (parameter is Orientation orientation && value is double width)
+        {
+            const double halfGripWidth = 9.0;
+            const double margin = 4.0;
+            return orientation switch
+            {
+                Orientation.Horizontal => (-width * 0.5) + halfGripWidth,
+                Orientation.Vertical => -width - margin,
+                _ => throw new ArgumentOutOfRangeException()
+            };
+        }
+
+        return 0.0;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        => throw new NotImplementedException();
+}