block

AIStudio.Wpf.DiagramDesigner/Controls/BlockDragThumb.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading;
+using System.Windows;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+using System.Windows.Media;
+using AIStudio.Wpf.DiagramDesigner.Geometrys;
+
+namespace AIStudio.Wpf.DiagramDesigner.Controls
+{
+    public class BlockDragThumb : DragThumb
+    {
+        BlockDesignerItemViewModel DesignerItem
+        {
+            get
+            {
+                return DataContext as BlockDesignerItemViewModel;
+            }
+        }
+
+        private Point? firstPoint;
+        protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
+        {
+            base.OnPreviewMouseLeftButtonDown(e);
+            if (e.LeftButton == MouseButtonState.Pressed &&  firstPoint == null)
+            {
+                firstPoint = e.GetPosition(this);
+                DesignerItem.BeforeExecute();
+            }
+        }
+
+        protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e)
+        {
+            base.OnPreviewMouseLeftButtonDown(e);
+
+            if (firstPoint == e.GetPosition(this))
+            {              
+                DesignerItem.EditCommand?.Execute(e.GetPosition(this));
+                firstPoint = null;
+            }
+
+        }
+
+    }
+}