重新设计了创建连线时的逻辑，能够预览连接成功后的外观样式

Serein.Workbench.Avalonia/Custom/Node/ViewModels/NodeViewModelBase.cs

@@ -1,5 +1,10 @@
-using CommunityToolkit.Mvvm.ComponentModel;
+using Avalonia.Controls;
+using Avalonia.Media;
+using CommunityToolkit.Mvvm.ComponentModel;
 using Serein.Library;
+using Serein.Workbench.Avalonia.Api;
+using Serein.Workbench.Avalonia.Custom.Node.Views;
+using Serein.Workbench.Avalonia.Custom.Views;
 using Serein.Workbench.Avalonia.ViewModels;
 using System;
 using System.Collections.Generic;
@@ -15,5 +20,117 @@ namespace Serein.Workbench.Avalonia.Custom.Node.ViewModels
     internal abstract class NodeViewModelBase : ViewModelBase
     {
         internal abstract NodeModelBase NodeModelBase { get; set; }
+
+        private Canvas NodeCanvas;
+
+        /// <summary>
+        /// 如果该节点放置在了某个容器节点，就会记录这个容器节点
+        /// </summary>
+        private INodeContainerControl NodeContainerControl { get; }
+
+        public NodeModelBase NodeModel { get; set; }
+
+        /// <summary>
+        /// 记录与该节点控件有关的所有连接
+        /// </summary>
+        private readonly List<NodeConnectionLineView> connectionControls = new List<NodeConnectionLineView>();
+
+        //public NodeControlViewModelBase ViewModel { get; set; }
+
+
+
+        public void SetNodeModel(NodeModelBase nodeModel) => this.NodeModel = nodeModel;
+        
+
+        /// <summary>
+        /// 添加与该节点有关的连接后，记录下来
+        /// </summary>
+        /// <param name="connection"></param>
+        public void AddCnnection(NodeConnectionLineView connection)
+        {
+            connectionControls.Add(connection);
+        }
+
+        /// <summary>
+        /// 删除了连接之后，还需要从节点中的记录移除
+        /// </summary>
+        /// <param name="connection"></param>
+        public void RemoveConnection(NodeConnectionLineView connection)
+        {
+            connectionControls.Remove(connection);
+            //connection.Remote();
+        }
+
+        /// <summary>
+        /// 删除所有连接
+        /// </summary>
+        public void RemoveAllConection()
+        {
+            foreach (var connection in this.connectionControls)
+            {
+                //connection.Remote();
+            }
+        }
+
+        /// <summary>
+        /// 更新与该节点有关的数据
+        /// </summary>
+        public void UpdateLocationConnections()
+        {
+            foreach (var connection in this.connectionControls)
+            {
+                //connection.RefreshLine(); // 主动更新连线位置
+            }
+        }
+
+
+        /// <summary>
+        /// 设置绑定：
+        /// Canvas.X and Y ： 画布位置
+        /// </summary>
+        public void SetBinding()
+        {
+            /* // 绑定 Canvas.Left
+             Binding leftBinding = new Binding("X")
+             {
+                 Source = ViewModel.NodeModel.Position, // 如果 X 属性在当前 DataContext 中
+                 Mode = BindingMode.TwoWay
+             };
+             BindingOperations.Apply(this, Canvas.LeftProperty, leftBinding);
+
+             // 绑定 Canvas.Top
+             Binding topBinding = new Binding("Y")
+             {
+                 Source = ViewModel.NodeModel.Position, // 如果 Y 属性在当前 DataContext 中
+                 Mode = BindingMode.TwoWay
+             };
+             BindingOperations.SetBinding(this, Canvas.TopProperty, topBinding);*/
+        }
+
+        /// <summary>
+        /// 穿透视觉树获取指定类型的第一个元素
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="parent"></param>
+        /// <returns></returns>
+        //protected T FindVisualChild<T>(DependencyObject parent) where T : DependencyObject
+        //{
+        //    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
+        //    {
+        //        var child = VisualTreeHelper.GetChild(parent, i);
+        //        if (child is T typedChild)
+        //        {
+        //            return typedChild;
+        //        }
+
+        //        var childOfChild = FindVisualChild<T>(child);
+        //        if (childOfChild != null)
+        //        {
+        //            return childOfChild;
+        //        }
+        //    }
+        //    return null;
+        //}
+
     }
 }