UI 자동화를 위해 바인딩 기능 구현

- 유니티 에셋 인증 오류로 meta 재생성

Packages/com.unity.inputsystem/InputSystem/Editor/Internal/AdvancedDropdown/AdvancedDropdownItem.cs

@@ -0,0 +1,75 @@
+#if UNITY_EDITOR
+using System;
+using System.Collections.Generic;
+
+namespace UnityEngine.InputSystem.Editor
+{
+    internal class AdvancedDropdownItem : IComparable
+    {
+        internal readonly List<AdvancedDropdownItem> m_Children = new List<AdvancedDropdownItem>();
+
+        public string name { get; set; }
+        public Texture2D icon { get; set; }
+        public int id { get; set; }
+        public bool enabled { get; set; } = true;
+        public int indent { get; set; }
+
+        internal int elementIndex { get; set; } = -1;
+
+        public IEnumerable<AdvancedDropdownItem> children => m_Children;
+
+        protected string m_SearchableName;
+        public virtual string searchableName => string.IsNullOrEmpty(m_SearchableName) ? name : m_SearchableName;
+
+        public void AddChild(AdvancedDropdownItem child)
+        {
+            m_Children.Add(child);
+        }
+
+        public int GetIndexOfChild(AdvancedDropdownItem child)
+        {
+            return m_Children.IndexOf(child);
+        }
+
+        static readonly AdvancedDropdownItem k_SeparatorItem = new SeparatorDropdownItem();
+
+        public AdvancedDropdownItem(string name)
+        {
+            this.name = name;
+            id = name.GetHashCode();
+        }
+
+        public virtual int CompareTo(object o)
+        {
+            return name.CompareTo((o as AdvancedDropdownItem).name);
+        }
+
+        public void AddSeparator(string label = null)
+        {
+            if (string.IsNullOrEmpty(label))
+                AddChild(k_SeparatorItem);
+            else
+                AddChild(new SeparatorDropdownItem(label));
+        }
+
+        internal bool IsSeparator()
+        {
+            return this is SeparatorDropdownItem;
+        }
+
+        public override string ToString()
+        {
+            return name;
+        }
+
+        private class SeparatorDropdownItem : AdvancedDropdownItem
+        {
+            public SeparatorDropdownItem(string label = "")
+                : base(label)
+            {
+            }
+        }
+    }
+}
+
+#endif // UNITY_EDITOR