修复实时模式下图像预览区仍可拖动的问题；非实时模式下鼠标跟随蓝色十字线功能

XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs

@@ -190,6 +190,20 @@ namespace XP.ImageProcessing.RoiControl.Controls
             set => SetValue(IsWheelZoomEnabledProperty, value);
         }
 
+        /// <summary>
+        /// 是否允许拖动画布平移图像（默认允许）。
+        /// 实时图像显示过程中可设为 false 以禁止图像拖动。
+        /// </summary>
+        public static readonly DependencyProperty IsImagePanEnabledProperty =
+            DependencyProperty.Register(nameof(IsImagePanEnabled), typeof(bool), typeof(PolygonRoiCanvas),
+                new PropertyMetadata(true));
+
+        public bool IsImagePanEnabled
+        {
+            get => (bool)GetValue(IsImagePanEnabledProperty);
+            set => SetValue(IsImagePanEnabledProperty, value);
+        }
+
         public static readonly DependencyProperty PanOffsetXProperty =
             DependencyProperty.Register(nameof(PanOffsetX), typeof(double), typeof(PolygonRoiCanvas),
                 new PropertyMetadata(0.0, OnPanOffsetChanged));
@@ -2355,6 +2369,10 @@ namespace XP.ImageProcessing.RoiControl.Controls
 
             lastMousePosition = e.GetPosition(imageDisplayGrid);
             isDragging = false;
+            if (!IsImagePanEnabled)
+            {
+                return;
+            }
             mainCanvas.CaptureMouse();
         }
 
@@ -2447,7 +2465,7 @@ namespace XP.ImageProcessing.RoiControl.Controls
                 return;
             }
 
-            if (e.LeftButton == MouseButtonState.Pressed && mainCanvas.IsMouseCaptured)
+            if (IsImagePanEnabled && e.LeftButton == MouseButtonState.Pressed && mainCanvas.IsMouseCaptured)
             {
                 Point currentPosition = e.GetPosition(imageDisplayGrid);
                 Vector delta = currentPosition - lastMousePosition;
@@ -2733,4 +2751,4 @@ namespace XP.ImageProcessing.RoiControl.Controls
 
         #endregion Events
     }
-}
+}