using System;
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.EventSystems;
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using UnityEngine.UI;
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public enum ScrollDir
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{
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Horizontal,
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Vertical
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}
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public class ScrollRectCenter : MonoBehaviour , IEndDragHandler,IDragHandler,IBeginDragHandler
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{
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public ScrollDir Dir = ScrollDir.Horizontal;
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public event Action<int> OnFinalSelect;
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/// <summary>
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/// 是否正在居中
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/// </summary>
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private bool _isCentering = false;
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/// <summary>
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/// 居中过程移动速度
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/// </summary>
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public float MoveToCenterSpeed = 10f;
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private ScrollRect _scrollView;
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private Transform _content;
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private List<float> _childrenPos = new List<float>();
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private float _targetPos;
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/// <summary>
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/// 当前中心child索引
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/// </summary>
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private int _curCenterChildIndex = -1;
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private bool inited = false;
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/// <summary>
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/// 当前中心ChildItem
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/// </summary>
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public GameObject CurCenterChildItem
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{
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get
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{
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GameObject centerChild = null;
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if (_content != null && _curCenterChildIndex >= 0 && _curCenterChildIndex < _content.childCount)
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{
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centerChild = _content.GetChild(_curCenterChildIndex).gameObject;
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}
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return centerChild;
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}
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}
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void Awake()
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{
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if (inited) return;
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inited = true;
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_scrollView = GetComponent<ScrollRect>();
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if (_scrollView == null)
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{
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Debug.LogError("ScrollRect is null");
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return;
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}
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_content = _scrollView.content;
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Recalculate();
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/*LayoutGroup layoutGroup = null;
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layoutGroup = _content.GetComponent<LayoutGroup>();
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if (layoutGroup == null)
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{
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Debug.LogError("LayoutGroup component is null");
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}
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_scrollView.movementType = ScrollRect.MovementType.Unrestricted;
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float spacing = 0f;
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//根据dir计算坐标，Horizontal：存x，Vertical：存y
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switch (Dir)
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{
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case ScrollDir.Horizontal:
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if (layoutGroup is HorizontalLayoutGroup)
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{
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float childPosX = _scrollView.GetComponent<RectTransform>().rect.width * 0.5f - GetChildItemWidth(0) * 0.5f;
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spacing = (layoutGroup as HorizontalLayoutGroup).spacing;
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_childrenPos.Add(childPosX);
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for (int i = 1; i < _content.childCount; i++)
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{
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childPosX -= GetChildItemWidth(i) * 0.5f + GetChildItemWidth(i - 1) * 0.5f + spacing;
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_childrenPos.Add(childPosX);
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}
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}
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else if (layoutGroup is GridLayoutGroup)
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{
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GridLayoutGroup grid = layoutGroup as GridLayoutGroup;
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float childPosX = _scrollView.GetComponent<RectTransform>().rect.width * 0.5f - grid.cellSize.x * 0.5f;
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_childrenPos.Add(childPosX);
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for (int i = 0; i < _content.childCount - 1; i++)
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{
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childPosX -= grid.cellSize.x + grid.spacing.x;
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_childrenPos.Add(childPosX);
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}
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}
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else
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{
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Debug.LogError("Horizontal ScrollView is using VerticalLayoutGroup");
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}
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break;
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case ScrollDir.Vertical:
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if (layoutGroup is VerticalLayoutGroup)
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{
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float childPosY = -_scrollView.GetComponent<RectTransform>().rect.height * 0.5f + GetChildItemHeight(0) * 0.5f;
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spacing = (layoutGroup as VerticalLayoutGroup).spacing;
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_childrenPos.Add(childPosY);
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for (int i = 1; i < _content.childCount; i++)
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{
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childPosY += GetChildItemHeight(i) * 0.5f + GetChildItemHeight(i - 1) * 0.5f + spacing;
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_childrenPos.Add(childPosY);
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}
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}
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else if (layoutGroup is GridLayoutGroup)
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{
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GridLayoutGroup grid = layoutGroup as GridLayoutGroup;
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float childPosY = -_scrollView.GetComponent<RectTransform>().rect.height * 0.5f + grid.cellSize.y * 0.5f;
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_childrenPos.Add(childPosY);
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for (int i = 1; i < _content.childCount; i++)
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{
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childPosY += grid.cellSize.y + grid.spacing.y;
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_childrenPos.Add(childPosY);
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}
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}
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else
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{
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Debug.LogError("Vertical ScrollView is using HorizontalLayoutGroup");
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}
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break;
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}*/
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}
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public void Recalculate()//重新计算
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{
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_childrenPos.Clear();
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LayoutGroup layoutGroup = null;
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layoutGroup = _content.GetComponent<LayoutGroup>();
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if (layoutGroup == null)
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{
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Debug.LogError("LayoutGroup component is null");
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}
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_scrollView.movementType = ScrollRect.MovementType.Unrestricted;
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float spacing = 0f;
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//根据dir计算坐标，Horizontal：存x，Vertical：存y
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switch (Dir)
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{
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case ScrollDir.Horizontal:
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if (layoutGroup is HorizontalLayoutGroup)
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{
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float childPosX = _scrollView.GetComponent<RectTransform>().rect.width * 0.5f - GetChildItemWidth(0) * 0.5f;
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spacing = (layoutGroup as HorizontalLayoutGroup).spacing;
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_childrenPos.Add(childPosX);
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for (int i = 1; i < _content.childCount; i++)
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{
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childPosX -= GetChildItemWidth(i) * 0.5f + GetChildItemWidth(i - 1) * 0.5f + spacing;
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_childrenPos.Add(childPosX);
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}
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}
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else if (layoutGroup is GridLayoutGroup)
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{
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GridLayoutGroup grid = layoutGroup as GridLayoutGroup;
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float childPosX = _scrollView.GetComponent<RectTransform>().rect.width * 0.5f - grid.cellSize.x * 0.5f;
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_childrenPos.Add(childPosX);
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for (int i = 0; i < _content.childCount - 1; i++)
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{
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childPosX -= grid.cellSize.x + grid.spacing.x;
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_childrenPos.Add(childPosX);
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}
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}
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else
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{
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Debug.LogError("Horizontal ScrollView is using VerticalLayoutGroup");
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}
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break;
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case ScrollDir.Vertical:
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if (layoutGroup is VerticalLayoutGroup)
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{
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float childPosY = -_scrollView.GetComponent<RectTransform>().rect.height * 0.5f + GetChildItemHeight(0) * 0.5f;
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spacing = (layoutGroup as VerticalLayoutGroup).spacing;
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_childrenPos.Add(childPosY);
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for (int i = 1; i < _content.childCount; i++)
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{
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childPosY += GetChildItemHeight(i) * 0.5f + GetChildItemHeight(i - 1) * 0.5f + spacing;
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_childrenPos.Add(childPosY);
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}
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}
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else if (layoutGroup is GridLayoutGroup)
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{
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GridLayoutGroup grid = layoutGroup as GridLayoutGroup;
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float childPosY = -_scrollView.GetComponent<RectTransform>().rect.height * 0.5f + grid.cellSize.y * 0.5f;
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_childrenPos.Add(childPosY);
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for (int i = 1; i < _content.childCount; i++)
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{
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childPosY += grid.cellSize.y + grid.spacing.y;
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_childrenPos.Add(childPosY);
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}
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}
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else
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{
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Debug.LogError("Vertical ScrollView is using HorizontalLayoutGroup");
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}
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break;
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}
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}
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private float GetChildItemWidth(int index)
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{
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return (_content.GetChild(index) as RectTransform).sizeDelta.x;
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}
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private float GetChildItemHeight(int index)
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{
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return (_content.GetChild(index) as RectTransform).sizeDelta.y;
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}
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void Start ()
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{
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}
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void Update ()
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{
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if (_isCentering)
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{
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Vector3 v = _content.localPosition;
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switch (Dir)
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{
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case ScrollDir.Horizontal:
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v.x = Mathf.Lerp(_content.localPosition.x, _targetPos, MoveToCenterSpeed * Time.deltaTime);
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_content.localPosition = v;
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if (Math.Abs(_content.localPosition.x - _targetPos) < 0.01f)
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{
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_isCentering = false;
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}
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break;
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case ScrollDir.Vertical:
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v.y = Mathf.Lerp(_content.localPosition.y, _targetPos, MoveToCenterSpeed * Time.deltaTime);
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_content.localPosition = v;
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if (Math.Abs(_content.localPosition.y - _targetPos) < 0.01f)
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{
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_isCentering = false;
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}
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break;
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}
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}
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}
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public void OnDrag(PointerEventData eventData)
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{
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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switch (Dir)
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{
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case ScrollDir.Horizontal:
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_targetPos = FindClosestChildPos(_content.localPosition.x, out _curCenterChildIndex);
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break;
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case ScrollDir.Vertical:
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_targetPos = FindClosestChildPos(_content.localPosition.y, out _curCenterChildIndex);
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if (OnFinalSelect != null)
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{
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OnFinalSelect(_curCenterChildIndex);
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}
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break;
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}
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_isCentering = true;
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}
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public void OnBeginDrag(PointerEventData eventData)
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{
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_isCentering = false;
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_curCenterChildIndex = -1;
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}
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private float FindClosestChildPos(float currentPos, out int curCenterChildIndex)
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{
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float closest = 0;
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float distance = Mathf.Infinity;
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curCenterChildIndex = -1;
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for (int i = 0; i < _childrenPos.Count; i++)
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{
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float p = _childrenPos[i];
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float d = Mathf.Abs(p - currentPos);
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if (d < distance)
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{
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distance = d;
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closest = p;
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curCenterChildIndex = i;
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}
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}
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return closest;
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}
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public void SetCurrentIndex(int index)
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{
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Awake();
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float p=_childrenPos[index];
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_targetPos = p;
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_isCentering = true;
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}
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}
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