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using UnityEngine;
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using System.Collections;
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using UnityEngine.UI;
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using System.Collections.Generic;
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using UnityEngine.EventSystems;
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using System;
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using DG.Tweening;
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/// <summary>
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/// 直接从网上找到的代码，基本可用。
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/// </summary>
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public class PageView : MonoBehaviour, IBeginDragHandler, IEndDragHandler
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{
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private ScrollRect rect; //滑动组件
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private float targethorizontal = 0; //滑动的起始坐标
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private bool isDrag = false; //是否拖拽结束
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private List<float> posList = new List<float>(); //求出每页的临界角，页索引从0开始
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private int currentPageIndex = -1;
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public Action<int> OnPageChanged;
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public RectTransform content;
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private bool stopMove = true;
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public float smooting = 4; //滑动速度
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public float sensitivity = 0;
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private float startTime;
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private float startDragHorizontal;
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public BottomMainTab mainTab;
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void Start()
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{
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rect = transform.GetComponent<ScrollRect>();
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var _rectWidth = GetComponent<RectTransform>();
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var tempWidth = ((float)content.transform.childCount * _rectWidth.rect.width);
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content.sizeDelta = new Vector2(tempWidth, _rectWidth.rect.height);
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//未显示的长度
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float horizontalLength = content.rect.width - _rectWidth.rect.width;
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for (int i = 0; i < rect.content.transform.childCount; i++)
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{
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posList.Add(_rectWidth.rect.width * i / horizontalLength);
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}
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currentPageIndex = 2;
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}
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void Update()
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{
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if (!isDrag && !stopMove)
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{
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startTime += Time.deltaTime;
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float t = startTime * smooting;
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rect.horizontalNormalizedPosition = Mathf.Lerp(rect.horizontalNormalizedPosition, targethorizontal, t);
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if (t >= 1)
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stopMove = true;
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}
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//Debug.Log(rect.horizontalNormalizedPosition);
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}
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public void pageTo(int index)
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{
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if (index >= 0 && index < posList.Count)
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{
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rect.DOHorizontalNormalizedPos(posList[index], 0.4f);
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//rect.horizontalNormalizedPosition = posList[index];
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SetPageIndex(index);
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}
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}
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private void SetPageIndex(int index)
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{
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if (currentPageIndex != index)
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{
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currentPageIndex = index;
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if (OnPageChanged != null)
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OnPageChanged(index);
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}
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}
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public void OnBeginDrag(PointerEventData eventData)
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{
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isDrag = true;
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//开始拖动
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startDragHorizontal = rect.horizontalNormalizedPosition;
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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float posX = rect.horizontalNormalizedPosition;
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posX += ((posX - startDragHorizontal) * sensitivity);
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posX = posX < 1 ? posX : 1;
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posX = posX > 0 ? posX : 0;
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int index = 0;
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float offset = Mathf.Abs(posList[index] - posX);
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//Debug.Log("offset " + offset);
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for (int i = 1; i < posList.Count; i++)
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{
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float temp = Mathf.Abs(posList[i] - posX);
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//Debug.Log("temp " + temp);
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//Debug.Log("i" + i);
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if (temp < offset)
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{
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index = i;
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offset = temp;
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}
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//Debug.Log("index " + index);
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}
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// 一次最多移动一个Page.
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if( Math.Abs(currentPageIndex - index) > 1)
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{
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if (currentPageIndex > index)
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index = currentPageIndex - 1;
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else
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index = currentPageIndex + 1;
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}
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//Debug.Log(index);
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SetPageIndex(index);
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GetIndex(index);
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targethorizontal = posList[index]; //设置当前坐标，更新函数进行插值
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isDrag = false;
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startTime = 0;
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stopMove = false;
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}
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public void GetIndex(int index)
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{
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if (this.mainTab)
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mainTab.onPageSwith(index);
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/*
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var toogle = toggleList.GetChild(index).GetComponent<Toggle>();
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toogle.isOn = true;*/
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}
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}
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