测量工具使用前检查图像是否已加载，使用HexMessageBox弹框提示

XplorePlane/ViewModels/Main/MainViewModel.cs

@@ -1,4 +1,4 @@
-using Prism.Commands;
+using Prism.Commands;
 using Prism.Events;
 using Prism.Ioc;
 using Prism.Mvvm;
@@ -14,6 +14,7 @@ using XplorePlane.ViewModels.Cnc;
 using XplorePlane.Views;
 using XplorePlane.Views.Cnc;
 using XP.Common.Logging.Interfaces;
+using XP.Common.GeneralForm.Views;
 using XP.Common.PdfViewer.Interfaces;
 using XP.Hardware.MotionControl.Abstractions;
 
@@ -449,32 +450,49 @@ namespace XplorePlane.ViewModels
 
         #region 测量命令实现
 
+        private bool CheckImageLoaded()
+        {
+            try
+            {
+                var viewportVm = _containerProvider.Resolve<ViewportPanelViewModel>();
+                if (viewportVm?.ImageSource != null) return true;
+            }
+            catch { }
+            HexMessageBox.Show("请先加载图像", MessageBoxButton.OK, MessageBoxImage.Information);
+            return false;
+        }
+
         private void ExecutePointDistanceMeasure()
         {
+            if (!CheckImageLoaded()) return;
             _logger.Info("点点距测量功能已触发");
             _eventAggregator.GetEvent<MeasurementToolEvent>().Publish(MeasurementToolMode.PointDistance);
         }
 
         private void ExecutePointLineDistanceMeasure()
         {
+            if (!CheckImageLoaded()) return;
             _logger.Info("点线距测量功能已触发");
             _eventAggregator.GetEvent<MeasurementToolEvent>().Publish(MeasurementToolMode.PointLineDistance);
         }
 
         private void ExecuteAngleMeasure()
         {
+            if (!CheckImageLoaded()) return;
             _logger.Info("角度测量功能已触发");
             _eventAggregator.GetEvent<MeasurementToolEvent>().Publish(MeasurementToolMode.Angle);
         }
 
         private void ExecuteThroughHoleFillRateMeasure()
         {
+            if (!CheckImageLoaded()) return;
             _logger.Info("通孔填锡率测量功能已触发");
             _eventAggregator.GetEvent<MeasurementToolEvent>().Publish(MeasurementToolMode.ThroughHoleFillRate);
         }
 
         private void ExecuteBgaVoidMeasure()
         {
+            if (!CheckImageLoaded()) return;
             _logger.Info("BGA空隙测量功能已触发");
             _eventAggregator.GetEvent<MeasurementToolEvent>().Publish(MeasurementToolMode.BgaVoid);
         }