118 lines
3.1 KiB
C#
118 lines
3.1 KiB
C#
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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public class PageView : MonoBehaviour, IBeginDragHandler, IEndDragHandler
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{
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public int PageCount;
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public float SlideSpeed = 4; //滑动速度
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public float sensitivity = 0.3f;
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public Action<int> OnPageChanged;
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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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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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private bool stopMove = true;
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private float startTime;
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private float startDragHorizontal;
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void Awake()
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{
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rect = transform.GetComponent<ScrollRect>();
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int tSplitCount = Mathf.Max(1, PageCount);
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float tDelta = tSplitCount > 1 ? (1f / (tSplitCount - 1)) : 1;
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for (int i = 0; i < tSplitCount; i++)
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{
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posList.Add(tDelta * i);
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}
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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 * SlideSpeed;
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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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}
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public void PageFix(int index)
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{
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PageTo(index, false);
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}
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public void PageScroll(int index)
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{
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PageTo(index);
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}
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public void PageTo(int index, bool pWithScroll = true)
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{
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if (index >= 0 && index < posList.Count)
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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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if (pWithScroll)
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{
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targethorizontal = posList[currentPageIndex]; //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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else
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{
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rect.horizontalNormalizedPosition = posList[index];
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}
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}
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else
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{
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Debug.LogError("页码不存在");
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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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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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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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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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}
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PageTo(index);
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}
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} |