Studio/Assets/Scripts/MouseObserver.cs

using System;
using UnityEngine;
using UnityEngine.EventSystems;

namespace Studio
{
    public class MouseObserver : MonoBehaviour
    {
        public Action onMouseExitClick;

        public bool isPointerOverSelf;

        private RectTransform rectTransform;
        private bool prevPointerOverSelf = false;

        private void Awake()
        {
            rectTransform = GetComponent<RectTransform>();
        }

        private void OnEnable()
        {
            if (rectTransform == null)
            {
                Debug.Log($"Not Found RectTransform in MouseObserver. {gameObject}");
                Destroy(this);
            }    
        }

        private void Update()
        {
            // <20><><EFBFBD>콺<EFBFBD><ECBDBA> <20>ڽ<EFBFBD><DABD><EFBFBD> UI(RectTransform) <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD> <20>ִ<EFBFBD><D6B4><EFBFBD> <20>Ǻ<EFBFBD>
            bool isOver = RectTransformUtility.RectangleContainsScreenPoint(
                rectTransform,
                Input.mousePosition,
                GetEventCamera()
            );

            if (isOver && !prevPointerOverSelf)
            {
                isPointerOverSelf = true;
            }
            else if (!isOver && prevPointerOverSelf)
            {
                isPointerOverSelf = false;
            }

            prevPointerOverSelf = isOver;

            if (Input.GetMouseButtonDown(0) && !isPointerOverSelf)
            {
                onMouseExitClick?.Invoke();
            }
        }

        // UI<55><49> ī<>޶<EFBFBD> <20><>ȯ (<28><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> null)
        private Camera GetEventCamera()
        {
            if (EventSystem.current != null && EventSystem.current.currentInputModule is StandaloneInputModule sim)
            {
                return sim.inputOverride?.mousePresent == true ? Camera.main : null;
            }
            return Camera.main;
        }
    }
}