/**
 * 
 * 
 *    Title:
 *      公共层：场景的淡入淡出
 *    description:
 *     [描述]
 *
 *    Date：
 *
 *    version：
 *
 *    modify Recoder：
 * 
 * 
 **/
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class FadeInAndOut : MonoBehaviour
{
    public static FadeInAndOut Instance;//本类实例
    public GameObject goRawImage;//RawImage对象
    public float FloColorChangeSpeed = 1f;

    private RawImage _RawImage;//RawImage组件
    private bool _BoolScenesToClear = true;//屏幕逐渐清晰
    private bool _BoolScenesToBlack = false;//屏幕逐渐模糊

    private void Awake()
    {
        Instance = this;

        //如果goRawImage实例化出来了，就添加一个RawImage组件
        if (goRawImage)
        {
            _RawImage = goRawImage.GetComponent<RawImage>();
        }
    }
    //控制淡入
    public void SetScenseToClear()
    {
        _BoolScenesToClear = true;
        _BoolScenesToBlack = false;
    }
    //控制淡出
    public void SetScenseToBlack()
    {
        _BoolScenesToClear = false;
        _BoolScenesToBlack = true;
    }
    //淡入
    private void FadeToclear()
    {
        //运用Color的插值计算
        _RawImage.color = Color.Lerp(_RawImage.color, Color.clear, FloColorChangeSpeed * Time.deltaTime);
    }

    private void FadeToBlack()
    {
        //运用Color的插值计算
        _RawImage.color = Color.Lerp(_RawImage.color, Color.black, FloColorChangeSpeed * Time.deltaTime);
    }

    private void ScenesToClear()
    {
        FadeToclear();
        if (_RawImage.color.a <= 0.05)
        {
            _RawImage.color = Color.clear;
            _RawImage.enabled = false;
            _BoolScenesToClear = false;
        }
    }

    private void ScenesToBlack()
    {
        _RawImage.enabled = true;
        FadeToBlack();
        if (_RawImage.color.a >= 0.95)
        {
            _RawImage.color = Color.black;
            _BoolScenesToBlack = false;
        }
    }

    void Update()
    {
        if (_BoolScenesToClear)
        {
            //屏幕淡入
            ScenesToClear();
        }
        else if (_BoolScenesToBlack)
        {
            //屏幕淡出
            ScenesToBlack();
        }
    }//updata_end
}