加入支持触摸的辅助方法和测试代码

src/Shared/HandyControlDemo_Shared/Window/TouchDragMoveWindow.xaml

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+<Window x:Class="HandyControlDemo.Window.TouchDragMoveWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        WindowStartupLocation="CenterScreen"
+        xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+        xmlns:ex="clr-namespace:HandyControlDemo.Tools.Extension"
+        Title="{ex:Lang Key={x:Static langs:LangKeys.Title}}" 
+        Height="450" 
+        Width="800" 
+        Icon="/HandyControlDemo;component/Resources/Img/icon.ico">
+</Window>

src/Shared/HandyControlDemo_Shared/Window/TouchDragMoveWindow.xaml.cs

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+using System.Windows;
+using System.Windows.Input;
+using HandyControl.Tools.Helper;
+
+namespace HandyControlDemo.Window
+{
+    public partial class TouchDragMoveWindow
+    {
+        public TouchDragMoveWindow()
+        {
+            InitializeComponent();
+
+            TouchDown += MainWindow_TouchDown;
+            TouchUp += MainWindow_TouchUp;
+        }
+
+        private void MainWindow_TouchUp(object sender, TouchEventArgs e)
+        {
+            _currentTouchCount--;
+        }
+
+        private void MainWindow_TouchDown(object sender, TouchEventArgs e)
+        {
+            CaptureTouch(e.TouchDevice);
+
+            if (_currentTouchCount == 0)
+            {
+                TouchDragMoveWindowHelper.DragMove(this);
+            }
+
+            _currentTouchCount++;
+        }
+
+        private uint _currentTouchCount;
+    }
+}