using System;
using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.Events;

public abstract class UIBase : MonoBehaviour
{
    // Start is called before the first frame update

    private UnityAction HideBack;
    private CanvasGroup canvasGroup;
    
    //淡入淡出的标记
    private bool isShow;
    //过场时间
    private int switchTime = 10;
    private void Awake()
    {
        canvasGroup = this.gameObject.GetComponent<CanvasGroup>();
        if (canvasGroup == null)
        {
            canvasGroup = this.gameObject.AddComponent<CanvasGroup>();
        }
    }

    protected virtual void Start()
    {
        Init();
    }

    // Update is called once per frame
    public virtual void Update()
    {
        //淡入
        if (isShow && canvasGroup.alpha != 1)
        {
            canvasGroup.alpha += Time.deltaTime*switchTime;
            if (canvasGroup.alpha > 1)
            {
                canvasGroup.alpha = 1;
            }
        }
        //淡出
        else if(!isShow)
        {
            canvasGroup.alpha -= Time.deltaTime*switchTime;
            if (canvasGroup.alpha <= 0)
            {
                canvasGroup.alpha = 0;
                //执行委托函数
                HideBack?.Invoke();
            }
        }
    }

    protected abstract void Init();


    public virtual void ShowMe()
    {
        isShow = true;
        //从0开始显示
        canvasGroup.alpha = 0;
    }

    public virtual void HideMe(UnityAction callback)
    {
        isShow = false;
        //从1开始隐藏
        canvasGroup.alpha = 1;
        //传入一个在隐藏时的委托函数
        HideBack = callback;
    }
    
    

}