PropertyChanged使用基类的，各个类不在自己定义

AIStudio.Wpf.Mind/ViewModels/MindNode.cs

@@ -99,12 +99,11 @@ namespace AIStudio.Wpf.Mind.ViewModels
 
         public void InitLayout(bool initAppearance)
         {
+            IsLoaded = false;
             var layout = TypeHelper.GetType(this.MindType.ToString() + "Layout");
             MindLayout = layout != null ? (System.Activator.CreateInstance(layout) as IMindLayout) : new MindLayout();
-
-            this.PropertyChanged -= this.Item_PropertyChanged;      
             MindLayout.Appearance(this, MindTheme, initAppearance);
-            this.PropertyChanged += this.Item_PropertyChanged;
+            IsLoaded = true;
         }
 
         public void InitConnectionLayout()
@@ -559,7 +558,7 @@ namespace AIStudio.Wpf.Mind.ViewModels
 
         public void RemoveFrom()
         {
-            this.PropertyChanged -= Item_PropertyChanged;
+            this.IsLoaded = false;
             if (this.ParentNode != null)
             {
                 this.ParentNode.Children.Remove(this);
@@ -572,8 +571,10 @@ namespace AIStudio.Wpf.Mind.ViewModels
         #endregion
 
         #region 属性改变
-        private void Item_PropertyChanged(object sender, PropertyChangedEventArgs e)
+        protected override void Item_PropertyChanged(object sender, PropertyChangedEventArgs e)
         {
+            if (IsLoaded == false) return;
+
             if (GetLevel0Node()?.LayoutUpdating == true) return;
 
             Interlocked.Increment(ref Root.DoCommandManager.BeginDo);
@@ -600,7 +601,7 @@ namespace AIStudio.Wpf.Mind.ViewModels
                 case nameof(ItemWidth):
                 case nameof(ItemHeight):
                     {
-                      
+
                         UpdatedLayout();
                         break;
                     }
@@ -617,17 +618,12 @@ namespace AIStudio.Wpf.Mind.ViewModels
                         SetItemWidthHeight();
                         break;
                     }
+                case nameof(FontViewModel.FontSize):
+                    SetItemWidthHeight();
+                    break;
             }
             Interlocked.Decrement(ref Root.DoCommandManager.BeginDo);
         }
-
-        protected override void FontViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
-        {
-            if (e.PropertyName == nameof(FontViewModel.FontSize))
-            {
-                SetItemWidthHeight();
-            }
-        }
         #endregion
 
         #region 布局相关