Game Object under Cursor UI#

using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.InputSystem;
using UnityEngine.Pool;
using VisualScript.Icons;

namespace VisualScript.Runtime
{
    [Get]

    [Title("Game Object under Cursor UI")]
    [Category("Input/Game Object under Cursor UI")]

    [Description("The topmost user interface Game Object found under the Mouse cursor")]
    [Image(typeof(IconCursor), ColorTheme.Type.TextLight)]

    [Keywords("Mouse", "Pointer", "Canvas", "Raycast", "Hover", "Widget")]

    [Serializable]
    public class TypeGameObjectInputCursorUI : TypeGameObject
    {
        [NonSerialized] private EventSystem m_EventSystem;
        [NonSerialized] private PointerEventData m_PointerData;

        public override GameObject Get(Args args)
        {
            Mouse mouse = Mouse.current;
            if (mouse == null) return null;

            EventSystem eventSystem = EventSystem.current;
            if (eventSystem == null) return null;

            if (this.m_PointerData == null || this.m_EventSystem != eventSystem)
            {
                this.m_EventSystem = eventSystem;
                this.m_PointerData = new PointerEventData(eventSystem);
            }

            this.m_PointerData.position = mouse.position.ReadValue();

            List<RaycastResult> results = ListPool<RaycastResult>.Get();

            try
            {
                eventSystem.RaycastAll(this.m_PointerData, results);

                GameObject result = results.Count > 0 ? results[0].gameObject : null;

                return result;
            }
            finally
            {
                ListPool<RaycastResult>.Release(results);
            }
        }

        public override string ToString()
        {
            return "Game Object under Cursor UI";
        }

        protected override SubscriptionMode Subscription => SubscriptionMode.OnChange;
    }
}