unity中EventTrigger组件的应用

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class LeftMenuBarEvent
{
    private static LeftMenuBarEvent leftMenuBar_this;

    //private LeftMenuBarEvent()
    //{
    //}
    public static LeftMenuBarEvent Instance()
    {
        if (leftMenuBar_this == null)
        {
            leftMenuBar_this = new LeftMenuBarEvent();
        }
        return leftMenuBar_this;
    }

    private bool m_state = true;
    private EventTrigger m_eventTrigger;
    public GameObject PanelName;
    public void StartInit(GameObject Obj)
    {
        Obj.transform.Find("LeftBarPanel/menu/_right").gameObject.SetActive(true);
        Obj.transform.Find("LeftBarPanel/menu/_left").gameObject.SetActive(false);
    }

    public void MouseInit(GameObject Obj)
    {

        AddTriggersListener(Obj.transform.Find("LeftBarPanel/menu").gameObject, EventTriggerType.PointerEnter, menuEnter);
        AddTriggersListener(Obj.transform.Find("LeftBarPanel/menu").gameObject, EventTriggerType.PointerExit,menuExit );

    }

    /// <summary>
    /// 为obj添加Eventrigger监听事件
    /// </summary>
    /// <param name="obj">添加监听的对象</param>
    /// <param name="eventType">添加的监听类型</param>
    /// <param name="action">触发的函数</param>
    public void AddTriggersListener(GameObject obj, EventTriggerType eventType, UnityAction<BaseEventData> action)
    {
        m_eventTrigger = obj.GetComponent<EventTrigger>();
        if (m_eventTrigger == null)
        {
            m_eventTrigger = obj.AddComponent<EventTrigger>();
        }
        if (m_eventTrigger.triggers.Count == )
        {
            m_eventTrigger.triggers = new List<EventTrigger.Entry>();
        }
        //定义所要绑定的事件类型
        EventTrigger.Entry entry = new EventTrigger.Entry();
        //设置事件类型
        entry.eventID = eventType;
        //定义回调函数
        UnityAction<BaseEventData> callback = new UnityAction<BaseEventData>(action);
        //设置回调函数
        entry.callback.AddListener(callback);
        //添加事件触发记录到GameObject的事件触发组件
        m_eventTrigger.triggers.Add(entry);

    }

    private float origiValue = -;
    private float endValue = ;
    private void Enter(GameObject Obj)
    {
        Debug.LogError("进入");
        Obj.transform.Find("LeftBarPanel/menu/_right").gameObject.SetActive(false);
        Obj.transform.Find("LeftBarPanel/menu/_left").gameObject.SetActive(true);
        Obj.transform.Find("LeftBarPanel/menu/leftmenu").transform.DOLocalMoveX(endValue, 0.5f);
    }

    private void Exit(GameObject Obj)
    {
         Debug.LogError("退出");
        Obj.transform.Find("LeftBarPanel/menu/_right").gameObject.SetActive(true);
        Obj.transform.Find("LeftBarPanel/menu/_left").gameObject.SetActive(false);
        Obj.transform.Find("LeftBarPanel/menu/leftmenu").transform.DOLocalMoveX(origiValue, 0.5f);
    }

    private void menuEnter(BaseEventData arg0)
    {
        Enter(PanelName);
    }

    private void menuExit(BaseEventData arg0)
    {
        Exit(PanelName);
    }

}