powerfun-unity/Assets/Scripts/UI/Prefab/Login/QuickLoginScroll.cs

using Assets.Scripts;
using DG.Tweening;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using UnityEngine;
using UnityEngine.UI;

public class QuickLoginScroll : MonoBehaviour
{
    // Start is called before the first frame update
    private ScrollRect scroll;
    private Transform content,lightbg;
    private float contentSize;
    private int count;
    [SerializeField] Button L, R;
    float startPos, endPos;
    void Start()
    {
        scroll = gameObject.GetComponent<ScrollRect>();
#if UNITY_IOS || UNITY_ANDROID
        UIManager.AddEvent(scroll.gameObject, UnityEngine.EventSystems.EventTriggerType.BeginDrag, b =>
        {
            startPos = scroll.horizontalNormalizedPosition;
            Debug.Log("开始滑动"+startPos);
        });
        UIManager.AddEvent(scroll.gameObject, UnityEngine.EventSystems.EventTriggerType.EndDrag, b =>
        {
            Debug.Log($"拽动结束{startPos},{endPos}");
            endPos = scroll.horizontalNormalizedPosition;
            goMovess();
        });
#endif
        content = gameObject.transform.Find("Viewport").Find("Content");
        lightbg = transform.parent.Find("Light");
        //Initial();
        if (L != null)
        {
            UIManager.AddEvent(L.gameObject, UnityEngine.EventSystems.EventTriggerType.PointerClick,(b)=> 
            {
                startPos = scroll.horizontalNormalizedPosition;
                goLeft();
            });
            //L.onClick.AddListener(goLeft);
        }
        if (R != null)
        {
            UIManager.AddEvent(R.gameObject, UnityEngine.EventSystems.EventTriggerType.PointerClick, (b) =>
            {
                startPos = scroll.horizontalNormalizedPosition;
                goRight();
            });
            //R.onClick.AddListener(goRight);
        }
    }

    private void doAni()
    {
        lightbg.GetComponent<Image>().color = Utils.HexToColorHtml("#ffffff00");
        lightbg.GetComponent<Image>().gameObject.SetActive(false);
        int index = GetIndex();
        content.GetChild(index).GetComponent<QuickLoginUser>().setNoActive();
        //lightbg.GetComponent<Image>().DOFade(0, 0.15f);
    }

    public void Initial() 
    {
        count = content.childCount;
#if !(UNITY_ANDROID || UNITY_IOS)
        if (content.childCount - 2 > 0)
        {
            contentSize = 1f / (content.childCount - 2);
        }
        else 
        {
            contentSize = 0;
        }
#else
        if (content.childCount - 3 > 0)
        {
            contentSize = 1f / (content.childCount - 3);
            //Debug.Log(contentSize);
        }
        else
        {
            contentSize = 0;
        }
#endif
        
        //scroll.horizontalNormalizedPosition = 0;
        Canvas.ForceUpdateCanvases();
        var i = PlayerPrefs.GetInt("UserInfoIndex");
        Debug.Log($"51 {i}");
#if !(UNITY_ANDROID || UNITY_IOS)
        scroll.horizontalNormalizedPosition = contentSize/2+i*contentSize;
#else
        scroll.horizontalNormalizedPosition = i * contentSize;
#endif
        SetColor();
    }
    void goMovess()
    {
        int i = (int)System.Math.Round((scroll.horizontalNormalizedPosition - startPos) / contentSize);
        //Debug.Log("左滑开始" + );
        if (i == 0) 
        {
            scroll.horizontalNormalizedPosition = startPos;
            return;
        }
        goMove(i);
    }
#if UNITY_ANDROID || UNITY_IOS
    void goLeft()
    {
        if (scroll.horizontalNormalizedPosition <= 0 + 0.0001) 
        {
            return;
        }
        goMove(-1);
    }
    void goRight()
    {
        if (scroll.horizontalNormalizedPosition + 0.0001 >= 1) 
        {
            return;
        } 
        goMove();
    }
#else
    void goLeft()
    {
        if (scroll.horizontalNormalizedPosition <= contentSize) return;
        goMove(-1);
    }
    void goRight()
    {
        if ((scroll.horizontalNormalizedPosition + contentSize) >= 1) return;
        goMove();
    }
#endif
    void goMove(int i = 1) 
    {
        Debug.Log("移动系数" + i);
        doAni();
        //#if !(UNITY_ANDROID || UNITY_IOS)
        //        if (!start) startPosition = scroll.horizontalNormalizedPosition;
        //#else
        //        int ind = GetIndex(startPos);
        //        if (!start) startPosition = ind*contentSize;
        //#endif
        if (!start) startPosition = scroll.horizontalNormalizedPosition;
        scrollIndex = i;
        start = true;
#if !(UNITY_ANDROID || UNITY_IOS)
        scrollValue = i * contentSize / 10;
#else
        scrollValue = ((GetIndex(startPos) + i) * contentSize - startPos) / 10;
#endif
    }
    private bool start = false;
    private float scrollValue = 0, totalScrollValue = 0, startPosition = 0;
    private int scrollIndex = 0;
    int GetIndex(float? startPos = null) 
    {
#if !(UNITY_ANDROID || UNITY_IOS)
        return (int)System.Math.Round(
                    (scroll.horizontalNormalizedPosition + (contentSize / 2)) / contentSize,
                    0);
#else
        if (contentSize == 0) 
        {
            return 1;
        }
        return (int)System.Math.Round
            ((startPos ?? scroll.horizontalNormalizedPosition + contentSize) / contentSize, 0);
#endif
    }
    void SetColor(int? rIndex = null)
    {
        int index = rIndex ?? GetIndex();
        //lightbg.GetComponent<Image>().gameObject.SetActive(true);
        //lightbg.GetComponent<Image>().DOFade(1, 0.2f);
        //content.GetChild(index).GetComponent<QuickLoginUser>().setActive();
        for (int i = 1; i < content.childCount - 1; i++)
        {
            string c;
            if (i == index)
            {
                lightbg.GetComponent<Image>().gameObject.SetActive(true);
                lightbg.GetComponent<Image>().DOFade(1, 0.2f);
                content.GetChild(i).GetComponent<QuickLoginUser>().setActive();
                //
            }
            else
            {
                content.GetChild(i).GetComponent<QuickLoginUser>().setNoActive();
            }
        }
    }
    // Update is called once per frame
    void FixedUpdate()
    {
        if (start)
        {
            scroll.horizontalNormalizedPosition += scrollValue;
            totalScrollValue += scrollValue;
            if (System.Math.Abs(totalScrollValue) >= contentSize)
            {
                scrollValue = 0;
                start = false;
#if !(UNITY_ANDROID || UNITY_IOS)
                scroll.horizontalNormalizedPosition = startPosition + (totalScrollValue<0?-1:1)*contentSize;
#else
                scroll.horizontalNormalizedPosition = (GetIndex(startPos) + scrollIndex) * contentSize;
#endif
                //Debug.Log();
                SetColor();
                totalScrollValue = 0;
            }
        }
    }
}