Unity UGUI Button 按下，抬起，连续按下，鼠标退出事件响应函数

using UnityEngine;using UnityEngine.Events;using UnityEngine.EventSystems;using System.Collections;public class test : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler, IPointerClickHandler{    public float interval = 0.1f;    [SerializeField]    UnityEvent m_OnLongpress = new UnityEvent();    private bool isPointDown = false;    private float lastInvokeTime;    // Update is called once per frame    void Update()    {        if (isPointDown)        {            if (Time.time - lastInvokeTime > interval)            {                //触发点击;                m_OnLongpress.Invoke();                lastInvokeTime = Time.time;                Debug.Log("长按");            }        }    }    public void OnPointerDown(PointerEventData eventData)    {        m_OnLongpress.Invoke();        isPointDown = true;        lastInvokeTime = Time.time;        Debug.Log("鼠标按下");    }    public void OnPointerUp(PointerEventData eventData)    {        isPointDown = false;        Debug.Log("鼠标抬起");    }    public void OnPointerExit(PointerEventData eventData)    {        isPointDown = false;        Debug.Log("鼠标退出");    }    public void OnPointerClick(PointerEventData eventData)    {        isPointDown = false;        Debug.Log("鼠标点击");    }}using UnityEngine;using UnityEngine.Events;u