react-beautiful-dnd 实现组件拖拽
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2022-06-26 09:21:47
一个react.js 的 漂亮,可移植性 列表拖拽库。想了解更多react-beautiful-dnd特点适用人群请看官方文档、中文翻译文档npm:1.安装 在已有react项目中 执行...
一个react.js 的 漂亮,可移植性 列表拖拽库。想了解更多react-beautiful-dnd特点适用人群请看官方文档、中文翻译文档
npm:
1.安装
在已有react项目中 执行以下命令 so easy。
# yarn yarn add react-beautiful-dnd # npm npm install react-beautiful-dnd --save
2.api
详情查看 官方文档。
3.react-beautiful-dnd demo
3.1 demo1 纵向组件拖拽
效果下图:
demo1.gif
实现代码:
import react, { component } from "react"; import { dragdropcontext, droppable, draggable } from "react-beautiful-dnd"; //初始化数据 const getitems = count => array.from({ length: count }, (v, k) => k).map(k => ({ id: `item-${k + 1}`, content: `this is content ${k + 1}` })); // 重新记录数组顺序 const reorder = (list, startindex, endindex) => { const result = array.from(list); const [removed] = result.splice(startindex, 1); result.splice(endindex, 0, removed); return result; }; const grid = 8; // 设置样式 const getitemstyle = (isdragging, draggablestyle) => ({ // some basic styles to make the items look a bit nicer userselect: "none", padding: grid * 2, margin: `0 0 ${grid}px 0`, // 拖拽的时候背景变化 background: isdragging ? "lightgreen" : "#ffffff", // styles we need to apply on draggables ...draggablestyle }); const getliststyle = () => ({ background: 'black', padding: grid, width: 250 }); export default class reactbeautifuldnd extends component { constructor(props) { super(props); this.state = { items: getitems(11) }; this.ondragend = this.ondragend.bind(this); } ondragend(result) { if (!result.destination) { return; } const items = reorder( this.state.items, result.source.index, result.destination.index ); this.setstate({ items }); } render() { return ( <dragdropcontext ondragend={this.ondragend}> <center> <droppable droppableid="droppable"> {(provided, snapshot) => ( <div //provided.droppableprops应用的相同元素. {...provided.droppableprops} // 为了使 droppable 能够正常工作必须 绑定到最高可能的dom节点中provided.innerref. ref={provided.innerref} style={getliststyle(snapshot)} > {this.state.items.map((item, index) => ( <draggable key={item.id} draggableid={item.id} index={index}> {(provided, snapshot) => ( <div ref={provided.innerref} {...provided.draggableprops} {...provided.draghandleprops} style={getitemstyle( snapshot.isdragging, provided.draggableprops.style )} > {item.content} </div> )} </draggable> ))} {provided.placeholder} </div> )} </droppable> </center> </dragdropcontext> ); } }
3.2 demo2 水平拖拽
效果下图:
demo2.gif
实现代码: 其实和纵向拖拽差不多 droppable 中 多添加了一个排列顺序的属性,direction="horizontal"
import react, { component } from "react"; import { dragdropcontext, droppable, draggable } from "react-beautiful-dnd"; const getitems = count => ( array.from({ length: count }, (v, k) => k).map(k => ({ id: `item-${k + 1}`, content: `this is content ${k + 1}` })) ) // 重新记录数组顺序 const reorder = (list, startindex, endindex) => { const result = array.from(list); //删除并记录 删除元素 const [removed] = result.splice(startindex, 1); //将原来的元素添加进数组 result.splice(endindex, 0, removed); return result; }; const grid = 8; // 设置样式 const getitemstyle = (isdragging, draggablestyle) => ({ // some basic styles to make the items look a bit nicer userselect: "none", padding: grid * 2, margin: `0 ${grid}px 0 0 `, // 拖拽的时候背景变化 background: isdragging ? "lightgreen" : "#ffffff", // styles we need to apply on draggables ...draggablestyle }); const getliststyle = () => ({ background: 'black', display: 'flex', padding: grid, overflow: 'auto', }); class reactbeautifuldndhorizontal extends component { constructor(props) { super(props); this.state = { items: getitems(10) }; this.ondragend = this.ondragend.bind(this); } ondragend(result) { if (!result.destination) { return; } const items = reorder( this.state.items, result.source.index, result.destination.index ); this.setstate({ items }); } render() { return ( <dragdropcontext ondragend={this.ondragend}> <droppable droppableid="droppable" direction="horizontal"> {(provided, snapshot) => ( <div {...provided.droppableprops} ref={provided.innerref} style={getliststyle(snapshot.isdraggingover)} > {this.state.items.map((item, index) => ( <draggable key={item.id} draggableid={item.id} index={index}> {(provided, snapshot) => ( <div ref={provided.innerref} {...provided.draggableprops} {...provided.draghandleprops} style={getitemstyle( snapshot.isdragging, provided.draggableprops.style )} > {item.content} </div> )} </draggable> ))} {provided.placeholder} </div> )} </droppable> </dragdropcontext> ) } } export default reactbeautifuldndhorizontal
3.3 demo3实现一个代办事项的拖拽(纵向 横向拖拽)
demo3.gif
实现原理其实大同小异 。代码整理后放在github上。地址:github
4.感受
目前简单的使用react - beautiful-dnd下来感觉 ,上手感觉挺简单,api也不繁琐。性能也不错(demo2中做过渲染170多个task。拖拽起来还是如丝般顺滑)。日后遇到啥不足会mark在一下。
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