整理一下项目文件

AIStudio.Wpf.DiagramDesigner/Controls/PointDragThumb.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using System.Windows.Media;
+
+namespace AIStudio.Wpf.DiagramDesigner.Controls
+{
+    public class PointDragThumb : Thumb
+    {
+        public PointDragThumb()
+        {
+            base.DragDelta += new DragDeltaEventHandler(DragThumb_DragDelta);
+            base.DragStarted += DragThumb_DragStarted;
+            base.DragCompleted += DragThumb_DragCompleted;
+        }
+
+
+        private void DragThumb_DragStarted(object sender, DragStartedEventArgs e)
+        {
+
+        }
+
+        private void DragThumb_DragCompleted(object sender, DragCompletedEventArgs e)
+        {
+
+        }
+
+        void DragThumb_DragDelta(object sender, DragDeltaEventArgs e)
+        {
+            if (this.DataContext is PointInfoBase point)
+            {
+                double minLeft = double.MaxValue;
+                double minTop = double.MaxValue;
+
+                double left = point.X;
+                double top = point.Y;
+                minLeft = double.IsNaN(left) ? 0 : Math.Min(left, minLeft);
+                minTop = double.IsNaN(top) ? 0 : Math.Min(top, minTop);
+
+                double deltaHorizontal = Math.Max(-minLeft, e.HorizontalChange);
+                double deltaVertical = Math.Max(-minTop, e.VerticalChange);
+
+                point.X += deltaHorizontal;
+                point.Y += deltaVertical;
+            }
+        }
+
+
+    }
+}