济南网站建站推广,python做软件的网站,网站建设费科目,中国进入全国紧急状态展示效果 原理:
当停止滑动时
判断Contet的horizontalNormalizedPosition
与子Item的缓存值 相减,并得到最小值#xff0c;然后将Content horizontalNormalizedPosition滚动过去 使用方式#xff1a;
直接将脚本挂到ScrollRect上
注意#xff1a;在创建Content子物体时…展示效果 原理:
当停止滑动时
判断Contet的horizontalNormalizedPosition
与子Item的缓存值 相减,并得到最小值然后将Content horizontalNormalizedPosition滚动过去 使用方式
直接将脚本挂到ScrollRect上
注意在创建Content子物体时 或子物体数量变更需要调用Refresh 代码
namespace ShangShangQian.Component
{using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;using UnityEngine.EventSystems;using System.Linq;using UnityEngine.Events;[RequireComponent(typeof(ScrollRect))]public class SnapScrollRect : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler{private RectTransform content;private ScrollRect rect;/// summary/// content 的位置应该滚到什么/// /summarypublic float target 1;/// summary/// 回滚的速度 0-1 越小越快/// /summarypublic float smooting 0.25f;public float currentVelocity;public float horizontalNormalizedPosition;public Listfloat values new Listfloat();public Listfloat distances new Listfloat();public ListRectTransform items new ListRectTransform();/// summary/// 是否拖拽中/// /summarypublic bool isDrag false;/// summary/// 到最近item的距离/// /summarypublic float distanceMin;/// summary/// 到最近item的索引/// /summarypublic int selectIndex;/// summary/// 是否匹配滑动中/// /summarypublic bool Snaping false;/// summary/// 回滚完毕后调用/// /summarypublic UnityEventint OnSnap;void Start(){rect GetComponentScrollRect();content rect.content;}/// summary/// 刷新数据content的子物体数量变更时需要调用此函数/// /summarypublic void Refresh(){items.Clear();values.Clear();for (int i 0; i content.childCount; i){if (content.GetChild(i).gameObject.activeInHierarchy){items.Add(content.GetChild(i).GetComponentRectTransform());}}//累加的变量values.Add(0);//每一个格子的所占比多少 float v 1f / (items.Count - 1);for (int i 1; i items.Count; i){values.Add(i * v);}//不同子元素数量 item 对应 的content horizontalNormalizedPosition 数值//1 0 //2 0 1 //3 0 0.5 1//4 0 0.33 0.66 1}void Update(){
#if UNITY_EDITORif (Input.GetKeyDown(KeyCode.A)){Refresh();}
#endif}void FixedUpdate(){horizontalNormalizedPosition rect.horizontalNormalizedPosition;if (isDrag){return;}if (Snaping){rect.horizontalNormalizedPosition Mathf.SmoothDamp(rect.horizontalNormalizedPosition, target, ref currentVelocity, smooting);if (Mathf.Abs(rect.horizontalNormalizedPosition - values[selectIndex]) 0.001f){Snaping false;Debug.Log(回滚: selectIndex);OnSnap.Invoke(selectIndex);}}}public void OnBeginDrag(PointerEventData eventData){isDrag true;}public void OnDrag(PointerEventData eventData){isDrag true;}public void OnEndDrag(PointerEventData eventData){isDrag false;Snaping true;distances.Clear();//当松手后判断那个距离最近for (int i 0; i values.Count; i){distances.Add(Mathf.Abs(rect.horizontalNormalizedPosition - values[i]));}distanceMin distances.Min();selectIndex distances.FindIndex(b b distanceMin);target values[selectIndex];rect.StopMovement();}/// summary/// 滚到到指定位置/// /summary/// param nameindex/parampublic void SnapToIndex(int index){Snaping true;selectIndex index;target values[selectIndex];}}
}
