Unity Long Click and Short Click Component

ClickEvent.cs

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

public class ClickEvent : MonoBehaviour
{
    [SerializeField]
    private UnityEvent onLongClick;
    [SerializeField]
    private UnityEvent onClick;
    [SerializeField]
    private float clickTime = 2.0f;
    private bool isInvoked = false;
    private float currentClickTime = 0f;
    public bool IsPress
    {
        get;
        set;
    }


    // Use this for initialization
    void Start()
    {
        EventTrigger trigger = gameObject.AddComponent<EventTrigger>();
        trigger.triggers = new List<EventTrigger.Entry>();

        EventTrigger.Entry downEntry = new EventTrigger.Entry();
        downEntry.eventID = EventTriggerType.PointerDown;
        downEntry.callback.AddListener((x) => { this.OnDown(); });
        trigger.triggers.Add(downEntry);

        EventTrigger.Entry upEntry = new EventTrigger.Entry();
        upEntry.eventID = EventTriggerType.PointerUp;
        upEntry.callback.AddListener((x) => { this.OnUp(); });
        trigger.triggers.Add(upEntry);
    }

    // Update is called once per frame
    void Update()
    {
        if (this.IsPress)
        {
            this.currentClickTime += Time.deltaTime;
        }
    }
    public void OnDown()
    {
        this.IsPress = true;
    }
    public void OnUp()
    {
        if (this.currentClickTime > this.clickTime)
        {
            this.onLongClick.Invoke();
        }
        else
        {
            this.onClick.Invoke();
        }
        this.IsPress = false;
        this.currentClickTime = 0f;
        this.isInvoked = false;
    }
}