代码优化

Ink Canvas/MainWindow_cs/MW_TouchEvents.cs

@@ -24,7 +24,6 @@ namespace Ink_Canvas
         private InkCanvasEditingMode lastInkCanvasEditingMode = InkCanvasEditingMode.Ink;
         private DateTime lastTouchDownTime = DateTime.MinValue;
         private const double MULTI_TOUCH_DELAY_MS = 100;
-        private bool isMultiTouchTimerActive = false;
 
         /// </summary> 
         /// 保存画布上的非笔画元素（如图片、媒体元素等）
@@ -572,12 +571,6 @@ namespace Ink_Canvas
                     inkCanvas.EditingMode = lastInkCanvasEditingMode;
             dec.Remove(e.TouchDevice.Id);
 
-            // 重置多触控点定时器状态
-            if (dec.Count <= 1)
-            {
-                isMultiTouchTimerActive = false;
-            }
-
             if (dec.Count == 0)
             {
                 isSingleFingerDragMode = false;