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

public class LongPressOrClickTrigger : UIBehaviour, IPointerDownHandler, IPointerUpHandler
{
    public UnityEvent onLongPress = new UnityEvent();
    public UnityEvent onDown = new UnityEvent();
    public UnityEvent onUp = new UnityEvent();

    private bool isPointerDown = false;
    private bool longPressTriggered = false;
    private float timePressStarted;

    /// <summary>指针在按钮上按下后至抬起前为 true；划出按钮区域不中断（与常见按住交互一致）。</summary>
    public bool IsPressing => isPointerDown;

    private void Update()
    {
        if (isPointerDown && !longPressTriggered)
        {
            if (Time.time - timePressStarted > 0.2f)
            {
                onLongPress.Invoke();
                longPressTriggered = true;
            }
        }
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        timePressStarted = Time.time;
        isPointerDown = true;
        longPressTriggered = false;
        onDown.Invoke();
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        isPointerDown = false;
        onUp.Invoke();
    }

    protected override void OnDisable()
    {
        base.OnDisable();
        isPointerDown = false;
        longPressTriggered = false;
    }
}