放大缩小

AIStudio.Wpf.DiagramDesigner/UserControls/DiagramControl.xaml.cs

@@ -94,7 +94,24 @@ namespace AIStudio.Wpf.DiagramDesigner
         {
             base.OnPreviewKeyDown(e);
 
-          
+            e.Handled = DiagramViewModel.ExecuteShortcut(e);
+        }
+
+        protected override void OnPreviewMouseWheel(MouseWheelEventArgs e)
+        {
+            base.OnPreviewMouseWheel(e);
+
+            if (Keyboard.IsKeyDown(Key.LeftCtrl) == false
+               && Keyboard.IsKeyDown(Key.RightCtrl) == false)
+            {
+                return;
+            }
+
+            var newZoomValue = DiagramViewModel.ZoomValue + (e.Delta > 0 ? 0.1 : -0.1);
+
+            DiagramViewModel.ZoomValue = Math.Max(Math.Min(newZoomValue, 10), 0.5);
+
+            e.Handled = true;
         }
     }
 }