//--------------------------------------------------------
//    [Author]:           玩个游戏
//    [  Date ]:           Monday, July 31, 2017
//--------------------------------------------------------

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using System;

    /// <summary>
    /// 延迟触发点击事件的按钮，用于长按事件
    /// </summary>
    public class DelayButton:MonoBehaviour,IPointerDownHandler,IPointerUpHandler {

        [SerializeField]
        float m_Delay = 0.5f;
        public float delay { get { return m_Delay; } }

        [SerializeField]
        Action m_OnClick;
        public Action onClick { get { return m_OnClick; } }

        float timer = 0f;
        bool down = false;

        public void OnPointerDown(PointerEventData eventData) {
            timer = 0f;
            down = true;
        }

        public void OnPointerUp(PointerEventData eventData) {
            down = false;
        }

        private void OnEnable() {
            timer = 0f;
            down = false;
        }

        private void LateUpdate() {
            if(down && timer < delay) {
                timer += Time.deltaTime;
                if(timer > delay) {
                    if(onClick != null) {
                        onClick?.Invoke();
                    }
                }
            }
        }

    }