彩色连接点完成

AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs

@@ -146,7 +146,7 @@ namespace AIStudio.Wpf.DiagramDesigner
 
         private bool _isSelected;
         [Browsable(false)]
-        public virtual bool IsSelected
+        public bool IsSelected
         {
             get
             {
@@ -154,7 +154,14 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
             set
             {
-                SetProperty(ref _isSelected, value);
+                if (SetProperty(ref _isSelected, value))
+                {  
+                    //如果没有文字，失去焦点自动清除
+                    if (_isSelected == false && string.IsNullOrEmpty(Text))
+                    {
+                        ClearText();
+                    }
+                }
             }
         }
 
@@ -298,6 +305,16 @@ namespace AIStudio.Wpf.DiagramDesigner
         }
 
 
+        protected virtual void ClearText()
+        {
+ 
+        }
+
+        public virtual void ClearSelected()
+        {
+            _isSelected = false;
+        }
+
         public virtual void AddToSelection(bool selected)
         {