新增了UI节点

NodeFlow/Model/SingleUINode.cs

@@ -0,0 +1,44 @@
+using Serein.Library;
+using Serein.Library.Api;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.NodeFlow.Model
+{
+    public class SingleUINode : NodeModelBase
+    {
+        public IEmbeddedContent Adapter {  get; private set; }
+        public SingleUINode(IFlowEnvironment environment) : base(environment)
+        {
+        }
+
+        public override async Task<object> ExecutingAsync(IDynamicContext context)
+        {
+            if(Adapter is null)
+            {
+
+                var result = await base.ExecutingAsync(context);
+                if (result is IEmbeddedContent adapter) 
+                {
+                    this.Adapter = adapter;
+                    context.NextOrientation = ConnectionInvokeType.IsSucceed;
+                }
+                else
+                {
+                    context.NextOrientation = ConnectionInvokeType.IsError;
+                }
+            }
+            else
+            {
+                var p = context.GetPreviousNode(this);
+                var data = context.GetFlowData(p.Guid);
+                Adapter.GetFlowControl().OnExecuting(data);
+            }
+            
+            return Task.FromResult<object?>(null);
+        }
+    }
+}