修改track复制步进和撤销模式

Signed-off-by: TRADER_FOER <lhf190@outlook.com>

Assets/Scripts/CommandSystem/CommandManager.cs

@@ -1,5 +1,6 @@
-using System.Collections;
+using System;
 using System.Collections.Generic;
+using Ichni.RhythmGame;
 using UnityEngine;
 
 namespace Ichni.Editor.Commands
@@ -14,6 +15,8 @@ namespace Ichni.Editor.Commands
         /// </summary>
         public static void ExecuteCommand(ICommand command)
         {
+            if (command == null) return;
+
             if (undoStack.Count > 0)
             {
                 var topCommand = undoStack.Peek();
@@ -28,7 +31,14 @@ namespace Ichni.Editor.Commands
             // 新操作彻底切断原本可能存在的重做未来
             command.Execute();
             undoStack.Push(command);
-            redoStack.Clear(); 
+            redoStack.Clear();
+        }
+
+        public static GameElement ExecuteCreate(Func<GameElement> createAction)
+        {
+            var command = new CreateElementCommand(createAction);
+            ExecuteCommand(command);
+            return command.CreatedElement;
         }
 
         public static void Undo()