更新

AntdWpf/Controls/Thumb.cs

@@ -0,0 +1,56 @@
+namespace AntdWpf.Controls
+{
+    using System.Windows.Input;
+
+    using AntdWpf.Contracts;
+
+    using ThumbBase = System.Windows.Controls.Primitives.Thumb;
+
+    public class Thumb : ThumbBase, IThumb
+    {
+        private TouchDevice currentDevice = null;
+
+        protected override void OnPreviewTouchDown(TouchEventArgs e)
+        {
+            // Release any previous capture
+            this.ReleaseCurrentDevice();
+            // Capture the new touch
+            this.CaptureCurrentDevice(e);
+        }
+
+        protected override void OnPreviewTouchUp(TouchEventArgs e)
+        {
+            this.ReleaseCurrentDevice();
+        }
+
+        protected override void OnLostTouchCapture(TouchEventArgs e)
+        {
+            // Only re-capture if the reference is not null
+            // This way we avoid re-capturing after calling ReleaseCurrentDevice()
+            if (this.currentDevice != null)
+            {
+                this.CaptureCurrentDevice(e);
+            }
+        }
+
+        private void ReleaseCurrentDevice()
+        {
+            if (this.currentDevice != null)
+            {
+                // Set the reference to null so that we don't re-capture in the OnLostTouchCapture() method
+                var temp = this.currentDevice;
+                this.currentDevice = null;
+                this.ReleaseTouchCapture(temp);
+            }
+        }
+
+        private void CaptureCurrentDevice(TouchEventArgs e)
+        {
+            bool gotTouch = this.CaptureTouch(e.TouchDevice);
+            if (gotTouch)
+            {
+                this.currentDevice = e.TouchDevice;
+            }
+        }
+    }
+}