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;

XplorePlane/ViewModels/Main/ViewportPanelViewModel.cs

@@ -131,6 +131,7 @@ using XP.Common.Controls.ImageHistogram;
                 {
                     _mainViewportService.SetRealtimeDisplayEnabled(value);
                     RaisePropertyChanged(nameof(IsWheelZoomEnabled));
+                    RaisePropertyChanged(nameof(IsImagePanEnabled));
                 }
             }
         }
@@ -140,6 +141,11 @@ using XP.Common.Controls.ImageHistogram;
         /// </summary>
         public bool IsWheelZoomEnabled => !_isRealtimeEnabled;
 
+        /// <summary>
+        /// 是否允许拖动图像：实时显示过程中禁用，停止实时后可拖动。
+        /// </summary>
+        public bool IsImagePanEnabled => !_isRealtimeEnabled;
+
         // Task 5.3: IsDetectorConnected property (read-only, private setter)
         public bool IsDetectorConnected
         {
@@ -322,6 +328,7 @@ using XP.Common.Controls.ImageHistogram;
             _isRealtimeEnabled = _mainViewportService.IsRealtimeDisplayEnabled;
             RaisePropertyChanged(nameof(IsRealtimeEnabled));
             RaisePropertyChanged(nameof(IsWheelZoomEnabled));
+            RaisePropertyChanged(nameof(IsImagePanEnabled));
 
             // Task 5.8: Sync _isCncRunning from service and raise IsAnimatedSwitchEnabled
             _isCncRunning = _mainViewportService.IsCncRunning;

XplorePlane/Views/Main/ViewportPanelView.xaml

@@ -31,10 +31,11 @@
                 Text="实时图像" />
         </Border>
 
-        <Grid Grid.Row="1">
+        <Grid Grid.Row="1" x:Name="ImageAreaGrid">
             <roi:PolygonRoiCanvas
                 x:Name="RoiCanvas"
                 ImageSource="{Binding ImageSource}"
+                IsImagePanEnabled="{Binding IsImagePanEnabled}"
                 IsWheelZoomEnabled="{Binding IsWheelZoomEnabled}"
                 ScaleBarMmPerPixel="0.139"
                 ShowScaleBar="{Binding DataContext.IsScaleBarVisible, RelativeSource={RelativeSource AncestorType=Window}}">
@@ -66,6 +67,11 @@
                     IsHitTestVisible="False"
                     Visibility="Collapsed" />
 
+            <!-- 鼠标跟随蓝色十字线叠加层（实时关闭时显示） -->
+            <Canvas x:Name="MouseCrosshairOverlay"
+                    IsHitTestVisible="False"
+                    Visibility="Collapsed" />
+
             <!-- 灰度直方图叠加层 -->
             <histogram:ImageHistogramControl
                 x:Name="HistogramOverlay"

XplorePlane/Views/Main/ViewportPanelView.xaml.cs

@@ -41,6 +41,7 @@ namespace XplorePlane.Views
         public ViewportPanelView()
         {
             InitializeComponent();
+            InitializeMouseCrosshair();
             DataContextChanged += OnDataContextChanged;
             AttachHistogramViewModel(DataContext as INotifyPropertyChanged);
             Loaded += (_, _) => UpdateHistogramFromCurrentImage();
@@ -568,6 +569,88 @@ namespace XplorePlane.Views
 
         #endregion
 
+        #region 鼠标跟随蓝色十字线
+
+        private System.Windows.Shapes.Line _mouseCrosshairH;
+        private System.Windows.Shapes.Line _mouseCrosshairV;
+
+        /// <summary>
+        /// 初始化鼠标跟随十字线（在构造函数中调用）。
+        /// </summary>
+        private void InitializeMouseCrosshair()
+        {
+            var brush = new SolidColorBrush(Color.FromArgb(200, 0, 120, 255));
+            brush.Freeze();
+
+            _mouseCrosshairH = new System.Windows.Shapes.Line
+            {
+                Stroke = brush,
+                StrokeThickness = 1,
+                IsHitTestVisible = false,
+                SnapsToDevicePixels = true
+            };
+
+            _mouseCrosshairV = new System.Windows.Shapes.Line
+            {
+                Stroke = brush,
+                StrokeThickness = 1,
+                IsHitTestVisible = false,
+                SnapsToDevicePixels = true
+            };
+
+            MouseCrosshairOverlay.Children.Add(_mouseCrosshairH);
+            MouseCrosshairOverlay.Children.Add(_mouseCrosshairV);
+
+            // 在图像区域 Grid 上监听鼠标事件
+            ImageAreaGrid.MouseMove += OnImageAreaMouseMove;
+            ImageAreaGrid.MouseLeave += OnImageAreaMouseLeave;
+        }
+
+        private void OnImageAreaMouseMove(object sender, System.Windows.Input.MouseEventArgs e)
+        {
+            var vm = DataContext as ViewportPanelViewModel;
+            if (vm == null || vm.IsRealtimeEnabled)
+            {
+                MouseCrosshairOverlay.Visibility = Visibility.Collapsed;
+                return;
+            }
+
+            MouseCrosshairOverlay.Visibility = Visibility.Visible;
+
+            var pos = e.GetPosition(ImageAreaGrid);
+            double w = ImageAreaGrid.ActualWidth;
+            double h = ImageAreaGrid.ActualHeight;
+
+            _mouseCrosshairH.X1 = 0;
+            _mouseCrosshairH.Y1 = pos.Y;
+            _mouseCrosshairH.X2 = w;
+            _mouseCrosshairH.Y2 = pos.Y;
+
+            _mouseCrosshairV.X1 = pos.X;
+            _mouseCrosshairV.Y1 = 0;
+            _mouseCrosshairV.X2 = pos.X;
+            _mouseCrosshairV.Y2 = h;
+        }
+
+        private void OnImageAreaMouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
+        {
+            MouseCrosshairOverlay.Visibility = Visibility.Collapsed;
+        }
+
+        /// <summary>
+        /// 当 IsRealtimeEnabled 变化时，隐藏鼠标十字线（开启实时后不再显示）。
+        /// </summary>
+        private void OnRealtimeStateChangedForMouseCrosshair()
+        {
+            var vm = DataContext as ViewportPanelViewModel;
+            if (vm != null && vm.IsRealtimeEnabled)
+            {
+                MouseCrosshairOverlay.Visibility = Visibility.Collapsed;
+            }
+        }
+
+        #endregion
+
         private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
         {
             AttachHistogramViewModel(e.NewValue as INotifyPropertyChanged);
@@ -596,6 +679,11 @@ namespace XplorePlane.Views
             {
                 UpdateHistogramFromCurrentImage();
             }
+
+            if (e.PropertyName == nameof(ViewportPanelViewModel.IsRealtimeEnabled))
+            {
+                OnRealtimeStateChangedForMouseCrosshair();
+            }
         }
 
         private void UpdateHistogramFromCurrentImage()