fix:触摸问题

Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs

@@ -1440,6 +1440,7 @@ namespace Ink_Canvas {
         }
 
         private void EraserIcon_Click(object sender, RoutedEventArgs e) {
+            EnterMultiTouchModeIfNeeded();
             bool isAlreadyEraser = inkCanvas.EditingMode == InkCanvasEditingMode.EraseByPoint;
             forceEraser = false;
             forcePointEraser = true;
@@ -1464,6 +1465,7 @@ namespace Ink_Canvas {
         }
 
         private void BoardEraserIcon_Click(object sender, RoutedEventArgs e) {
+            EnterMultiTouchModeIfNeeded();
             bool isAlreadyEraser = inkCanvas.EditingMode == InkCanvasEditingMode.EraseByPoint;
             forceEraser = false;
             forcePointEraser = true;
@@ -1487,6 +1489,7 @@ namespace Ink_Canvas {
         }
 
         private void EraserIconByStrokes_Click(object sender, RoutedEventArgs e) {
+            EnterMultiTouchModeIfNeeded();
 
             if (lastBorderMouseDownObject != null && lastBorderMouseDownObject is Panel)
                 ((Panel)lastBorderMouseDownObject).Background = new SolidColorBrush(Colors.Transparent);

Ink Canvas/MainWindow_cs/MW_SelectionGestures.cs

@@ -244,6 +244,7 @@ namespace Ink_Canvas {
         }
 
         private void BtnSelect_Click(object sender, RoutedEventArgs e) {
+            ExitMultiTouchModeIfNeeded();
             forceEraser = true;
             drawingShapeMode = 0;
             inkCanvas.IsManipulationEnabled = false;
@@ -424,6 +425,7 @@ namespace Ink_Canvas {
         }
 
         private void LassoSelect_Click(object sender, RoutedEventArgs e) {
+            ExitMultiTouchModeIfNeeded();
             forceEraser = false;
             forcePointEraser = false;
             isLastTouchEraser = false;
@@ -433,6 +435,7 @@ namespace Ink_Canvas {
         }
 
         private void BtnLassoSelect_Click(object sender, RoutedEventArgs e) {
+            ExitMultiTouchModeIfNeeded();
             forceEraser = false;
             forcePointEraser = false;
             isLastTouchEraser = false;

Ink Canvas/MainWindow_cs/MW_TouchEvents.cs

@@ -479,5 +479,43 @@ namespace Ink_Canvas {
                 }
             }
         }
+
+        // 退出多指书写模式，恢复InkCanvas的TouchDown事件绑定
+        private void ExitMultiTouchModeIfNeeded()
+        {
+            if (isInMultiTouchMode)
+            {
+                inkCanvas.StylusDown -= MainWindow_StylusDown;
+                inkCanvas.StylusMove -= MainWindow_StylusMove;
+                inkCanvas.StylusUp -= MainWindow_StylusUp;
+                inkCanvas.TouchDown -= MainWindow_TouchDown;
+                inkCanvas.TouchDown += Main_Grid_TouchDown;
+                if (inkCanvas.EditingMode != InkCanvasEditingMode.EraseByPoint)
+                {
+                    inkCanvas.EditingMode = InkCanvasEditingMode.Ink;
+                }
+                inkCanvas.Children.Clear();
+                isInMultiTouchMode = false;
+            }
+        }
+
+        // 进入多指书写模式，绑定Main_Grid_TouchDown
+        private void EnterMultiTouchModeIfNeeded()
+        {
+            if (!isInMultiTouchMode)
+            {
+                inkCanvas.StylusDown += MainWindow_StylusDown;
+                inkCanvas.StylusMove += MainWindow_StylusMove;
+                inkCanvas.StylusUp += MainWindow_StylusUp;
+                inkCanvas.TouchDown += MainWindow_TouchDown;
+                inkCanvas.TouchDown -= Main_Grid_TouchDown;
+                if (inkCanvas.EditingMode != InkCanvasEditingMode.EraseByPoint)
+                {
+                    inkCanvas.EditingMode = InkCanvasEditingMode.None;
+                }
+                inkCanvas.Children.Clear();
+                isInMultiTouchMode = true;
+            }
+        }
     }
 }