Project_WL/Assets/Script/Util/ButtonPress.cs

using UnityEngine;
using UnityEngine.EventSystems;

public class ButtonPress : UnityEngine.UI.Button
{
    private bool _handled;
    private bool _pressed;
    private float _pressedTime;
    public float LongPressDuration = 0.9f;

    public override void OnPointerExit(PointerEventData eventData)
    {
        base.OnPointerExit(eventData);
        _pressed = false;
    }

    public override void OnPointerDown(PointerEventData eventData)
    {
        base.OnPointerDown(eventData);

        if (eventData.button != PointerEventData.InputButton.Left)
        {
            return;
        }

        _pressed = true;
        _handled = false;
        _pressedTime = Time.realtimeSinceStartup;
    }

    public override void OnPointerUp(PointerEventData eventData)
    {
        if (!_handled)
        {
            base.OnPointerUp(eventData);
        }

        _pressed = false;
    }

    public override void OnPointerClick(PointerEventData eventData)
    {
        if (!_handled)
        {
            base.OnPointerClick(eventData);
        }
    }

    protected override void OnDisable()
    {
        _pressed = false;
    }

    private void Update()
    {
        if (!_pressed)
        {
            return;
        }

        if (Time.realtimeSinceStartup - _pressedTime >= LongPressDuration)
        {
            //_pressed = false;
            //_handled = true;
            onClick.Invoke();
        }
    }
}