Application of EventTrigger component in unity

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> 
    /// Add Eventrigger to monitor events for obj  
     ///  </summary> 
    ///  <param name="obj"> Add monitor object </param> 
    ///  <param name="eventType "> Added listener type </param> 
    ///  <param name="action"> Triggered function </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 == 0)
        {
            m_eventTrigger.triggers = new List<EventTrigger.Entry>();
        }
        // Define the event type to be bound    
        EventTrigger.Entry entry = new EventTrigger.Entry();
         // Set the event type     
        entry.eventID = eventType;
         // Define the callback function     
        UnityAction<BaseEventData> callback = new UnityAction<BaseEventData> (action );
         // Set the callback function     
        entry.callback.AddListener(callback);
         // Add the event trigger component of the event trigger record to the GameObject     
        m_eventTrigger.triggers.Add(entry);

    }

    private float origiValue = -160;
    private float endValue = 160;
    private void Enter(GameObject Obj)
    {
        Debug.LogError( " Enter " );
        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);
    }

}