WaterFlush/Assets/Scripts/ExtendedButton_PointItem.cs

using System;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
 
public class ExtendedButton_PointItem : Button
{
    public int index = 0;
    public Action<int> onPointerEnter;

    public override void OnPointerEnter(PointerEventData eventData)
    {
        base.OnPointerEnter(eventData);
        onPointerEnter?.Invoke(index);
    }
}