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使用dnd-kit实现拖拽排序

效果展示

实现源码

安装依赖

dad-kit github地址

yarn add @dnd-kit/core @dnd-kit/sortable @dnd-kit/utilities @dnd-kit/modifiers

这几个包的作用

• @dnd-kit/core：核心库，提供基本的拖拽功能。
• @dnd-kit/sortable：扩展库，提供排序功能和工具。
• @dnd-kit/modifiers：修饰库，提供拖拽行为的限制和修饰功能。
• @dnd-kit/utilities：工具库，提供 CSS 和实用工具函数。上述演示的平滑移动的样式就是来源于这个包。

实现代码

最外层使用 DndContext 组件，然后内层使用 SortableContext，并且传入列表信息，SortableContext 内层正常显示循环出来的DOM元素

import React, { ChangeEvent, FC, useState } from 'react'
import useGetComponentInfo from '../../hooks/useGetComponentInfo'
import { Button, Flex, Input, message, Space } from 'antd'
import style from './Layerlib.module.scss'
import { EyeInvisibleOutlined, LockOutlined, DragOutlined } from '@ant-design/icons'
import classNames from 'classnames'
import { useDispatch } from 'react-redux'
import {changeSelectedId,changeComponentTitle,componentInfoType,hiddenComponent,toogleLock,reorderComponents
} from '../../store/componentsReducer'import type { DragEndEvent, DragMoveEvent } from '@dnd-kit/core'
import { DndContext } from '@dnd-kit/core'
import { arrayMove, SortableContext, rectSortingStrategy, useSortable } from '@dnd-kit/sortable'
import { restrictToParentElement } from '@dnd-kit/modifiers'
import { CSS } from '@dnd-kit/utilities'export default function Layerlib() {// 记录当前正在修改的idconst [changingId, setChangingId] = useState('')const { componentsList, selectedId } = useGetComponentInfo()const dispatch = useDispatch()// 点击组件function handleClick(component: componentInfoType) {const { _id, isHidden } = componentif (isHidden) {message.error('不能选中被隐藏的组件')return}if (_id !== selectedId) {dispatch(changeSelectedId(_id))setChangingId('')} else {setChangingId(_id)}}// 修改组件标题function handleChangeTitle(event: ChangeEvent<HTMLInputElement>, id: string) {const value = event.target.value.trim()if (!value) returndispatch(changeComponentTitle({ _id: id, title: value }))}// 切换组件隐藏和显示function handleToggleHidden(component: componentInfoType) {const { _id, isHidden } = componentdispatch(hiddenComponent({ _id, isHidden: !isHidden }))}// 切换锁定function handleToggleLock(component: componentInfoType) {const { _id } = componentdispatch(toogleLock({ _id }))}// 拖动排序const getMoveIndex = (array: componentInfoType[], dragItem: DragMoveEvent) => {const { active, over } = dragItemconst activeIndex = array.findIndex(item => item._id === active.id)const overIndex = array.findIndex(item => item._id === over?.id)// 处理未找到索引的情况return {activeIndex: activeIndex !== -1 ? activeIndex : 0,overIndex: overIndex !== -1 ? overIndex : activeIndex}}// 拖动结束const dragEndEvent = (dragItem: DragEndEvent) => {const { active, over } = dragItemif (!active || !over) return // 处理边界情况const moveDataList = [...componentsList]const { activeIndex, overIndex } = getMoveIndex(moveDataList, dragItem)if (activeIndex !== overIndex) {const newDataList = arrayMove(moveDataList, activeIndex, overIndex)// 关键：更新一下最新的组件数据dispatch(reorderComponents(newDataList))}}type DraggableItemProps = {component: componentInfoType}// 拖拽的子组件const DraggableItem: FC<DraggableItemProps> = ({ component }) => {const { _id, isLock, isHidden } = componentconst { setNodeRef, attributes, listeners, transform, transition } = useSortable({id: _id,transition: {duration: 500,easing: 'cubic-bezier(0.25, 1, 0.5, 1)'}})const styles = {transform: CSS.Transform.toString(transform),transition}// 动态样式const componentClass = classNames({[style.check]: _id === selectedId,[style.hidden]: isHidden})return (<Flexkey={_id}align="center"justify="space-between"gap={10}className={style.layerItem}ref={setNodeRef}style={styles}><div className={componentClass} style={{ flex: 1 }} onClick={() => handleClick(component)}>{changingId === _id ? (<Inputvalue={component.title}autoFocusonChange={event => handleChangeTitle(event, component._id)}onPressEnter={() => setChangingId('')}onBlur={() => setChangingId('')}/>) : (component.title)}</div><Space>{/* 拖动排序 */}<Buttonsize="small"shape="circle"icon={<DragOutlined />}type="text"style={{cursor: 'move'}}{...attributes}{...listeners}/><Buttonsize="small"shape="circle"icon={<EyeInvisibleOutlined />}type={isHidden ? 'primary' : 'text'}onClick={() => handleToggleHidden(component)}/><Buttonsize="small"shape="circle"icon={<LockOutlined />}type={isLock ? 'primary' : 'text'}onClick={() => handleToggleLock(component)}/></Space></Flex>)}return (<DndContext onDragEnd={dragEndEvent} modifiers={[restrictToParentElement]}><SortableContext items={componentsList.map(item => item._id)} strategy={rectSortingStrategy}><div className="drag-container">{componentsList.map(component => (<DraggableItem key={component._id} component={component} />))}</div></SortableContext></DndContext>)
}

代码解释

modifiers

标识符，传入一个标识符数组以限制在父组件进行拖曳的行为。我们代码中使用 restrictToParentElement，限制在父元素内的标识符，主要可选的一些标识符如下：

• restrictToParentElement：限制在父元素内。
• restrictToFirstScrollableAncestor：限制在第一个可滚动祖先元素。
• restrictToVerticalAxis：限制在垂直轴上。
• restrictToHorizontalAxis：限制在水平轴上。
• restrictToBoundingRect：限制在指定矩形区域内。
• snapCenterToCursor：使元素中心对齐到光标。

onDragEnd

顾名思义，就是用户鼠标松开后触发的拖曳事件的回调。触发时会自动传入类型为 DragEndEvent 的对象，我们可以从其中拿出 active 和 over 两个参数来具体处理拖曳事件。

active 包含 正在拖曳的元素的相关信息，over 包含最后鼠标松开时所覆盖到的元素的相关信息。

import { arrayMove } from '@dnd-kit/sortable'// 拖动排序
const getMoveIndex = (array: componentInfoType[], dragItem: DragMoveEvent) => {const { active, over } = dragItemconst activeIndex = array.findIndex(item => item._id === active.id)const overIndex = array.findIndex(item => item._id === over?.id)// 处理未找到索引的情况return {activeIndex: activeIndex !== -1 ? activeIndex : 0,overIndex: overIndex !== -1 ? overIndex : activeIndex}
}// 拖动结束
const dragEndEvent = (dragItem: DragEndEvent) => {const { active, over } = dragItemif (!active || !over) return // 处理边界情况const moveDataList = [...componentsList]const { activeIndex, overIndex } = getMoveIndex(moveDataList, dragItem)if (activeIndex !== overIndex) {const newDataList = arrayMove(moveDataList, activeIndex, overIndex)// 关键：更新一下最新的组件数据dispatch(reorderComponents(newDataList))}
}

我们的代码中，从 dragItem 中解构出 active, over 这两个变量，分别代表当前拖拽的组件数据和被覆盖的组件数据，然后通过 @dnd-kit/sortable 提供的 arrayMove 方法得到排序后的组件列表，接着使用dispatch更新Redux中的数据，实现页面展示最新排序的效果