Jeremy/Assets/Scripts/MyButton.cs

using System;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class MyButton : MonoBehaviour, IPointerClickHandler, IPointerEnterHandler, IPointerExitHandler
{
    [SerializeField]
    private UnityEvent _onClick;

    // references
    [SerializeField]
    private OutlineFx.OutlineFx _outlineFx;

    [SerializeField]
    public bool isActive = true;

    private bool _isPointerOver = false;

    public void SetActive(bool active)
    {
        isActive = active;
    }

    private void OnEnable()
    {
        if (!TryGetComponent(out Collider2D _))
        {
            Debug.LogError("MyButton needs a Collider2D to work", gameObject);
        }

        if (!_outlineFx)
        {
            _outlineFx = GetComponent<OutlineFx.OutlineFx>();
        }
        _outlineFx.enabled = false;
    }

    public void OnPointerClick(PointerEventData eventData)
    {
        if (isActive)
            _onClick.Invoke();
    }
    public void OnPointerEnter(PointerEventData eventData)
    {
        _isPointerOver = true;
    }
    public void OnPointerExit(PointerEventData eventData)
    {
        _isPointerOver = false;
    }

    private void Update()
    {
        _outlineFx.enabled = _isPointerOver && isActive;
    }
}