UI 자동화를 위해 바인딩 기능 구현

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Packages/com.unity.inputsystem/InputSystem/Plugins/UI/MultiplayerEventSystem.cs

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+#if PACKAGE_DOCS_GENERATION || UNITY_INPUT_SYSTEM_ENABLE_UI
+using UnityEngine.EventSystems;
+
+namespace UnityEngine.InputSystem.UI
+{
+    /// <summary>
+    /// A modified EventSystem class, which allows multiple players to have their own instances of a UI,
+    /// each with it's own selection.
+    /// </summary>
+    /// <remarks>
+    /// You can use the <see cref="playerRoot"/> property to specify a part of the hierarchy belonging to the current player.
+    /// Mouse selection will ignore any game objects not within this hierarchy, and all other navigation, using keyboard or
+    /// gamepad for example, will be constrained to game objects under that hierarchy.
+    /// </remarks>
+    [HelpURL(InputSystem.kDocUrl + "/manual/UISupport.html#multiplayer-uis")]
+    public class MultiplayerEventSystem : EventSystem
+    {
+        [Tooltip("If set, only process mouse and navigation events for any game objects which are children of this game object.")]
+        [SerializeField] private GameObject m_PlayerRoot;
+
+        /// <summary>
+        /// The root object of the UI hierarchy that belongs to the given player.
+        /// </summary>
+        /// <remarks>
+        /// This can either be an entire <c>Canvas</c> or just part of the hierarchy of
+        /// a specific <c>Canvas</c>.
+        /// </remarks>
+        public GameObject playerRoot
+        {
+            get => m_PlayerRoot;
+            set
+            {
+                m_PlayerRoot = value;
+                InitializePlayerRoot();
+            }
+        }
+
+        protected override void OnEnable()
+        {
+            base.OnEnable();
+
+            InitializePlayerRoot();
+        }
+
+        protected override void OnDisable()
+        {
+            base.OnDisable();
+        }
+
+        private void InitializePlayerRoot()
+        {
+            var inputModule = GetComponent<InputSystemUIInputModule>();
+            if (inputModule != null)
+                inputModule.localMultiPlayerRoot = m_PlayerRoot;
+        }
+
+        protected override void Update()
+        {
+            var originalCurrent = current;
+            current = this; // in order to avoid reimplementing half of the EventSystem class, just temporarily assign this EventSystem to be the globally current one
+            try
+            {
+                base.Update();
+            }
+            finally
+            {
+                current = originalCurrent;
+            }
+        }
+    }
+}
+#endif