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分享原因
由于项目中需要使用拖曳组件(需求:全局，跨组件，跨数据)，我选择了react-dnd
概念
React DnD 是一组 React 高阶组件，我们在使用的时候只需要将目标元素进行包裹，就可以实现目标元素具有拖动或接受拖动的功能。它将整个拖动的事件完整的描述了出来，这使得我们在使用的过程变得简单易用和扩展上有了无限的可能，在处理复杂拖曳和丰富需求的时候强烈建议使用它。
官网 https://react-dnd.github.io/react-dnd/
基本
- Item type：跟redux或其他组件一样，item用来描述拖动dom的数据对象，type用来标识一组可拖动和接收
- Backend：用来表现dom拖动现象，我使用了HTML5Backend
- Monitors：用来查询当前拖动状态(数据，dom，位置等)，强大的收集功能
- Connectors：用于Backend和组件状态之间的连接
- hook：useDrag 将组件作为可拖动的来源注册到dnd useDrop 将组件作为可接收拖动来源注册到dnd
使用方法
导入
npm install react-dnd react-dnd-html5-backend
初始化
import { HTML5Backend } from 'react-dnd-html5-backend';<DndProvider backend={HTML5Backend}>....</>
组件参数type.ts
export type DragProps = {name: string; //名称标记type: string; //暂用于标记拖拽类型,接收者和发送者一致role: string; //data: any; //绑定的数据用于拖曳后操作数据content: JSX.Element; //绑定的元素onDragFinished: Function; //拖动结束回调.
};export type AcceptorProps = {name: string; //名称标记type: string; //暂用于标记拖拽类型,接收者和发送者一致role: string; //data: any; //绑定的数据用于拖曳后操作数据content: JSX.Element; //绑定的元素styleType: 'background' | 'border';// customStyle:{// canDrop:string,// isActive:string// }onHover: Function; //移入区域.
};
组件MyDrag.ts
import { useDrag, useDrop } from 'react-dnd';
import { DragProps, AcceptorProps } from './type';
export const Dragger = function Dragger(option: DragProps) {const { name, data, type, onDragFinished } = option;const [{ isDragging }, drag] = useDrag(() => ({type: type,item: { name: name, data: data },end: (item, monitor, ...arg) => {console.log(arg);const dropResult = monitor.getDropResult();if (item && dropResult) {console.log('source:', item);console.log('target:', dropResult);}if (onDragFinished) {onDragFinished(item, dropResult);}},collect: (monitor) => ({isDragging: monitor.isDragging(),handlerId: monitor.getHandlerId(),}),}));const opacity = isDragging ? 0.4 : 1;return (<divref={drag}role={option.role}style={{ opacity }}data-id={`${option.name}`}>{option.content}</div>);
};
export const Acceptor = (option: AcceptorProps) => {const { name, data, type, styleType, onHover } = option;const [{ canDrop, isOver }, drop] = useDrop(() => ({accept: type,drop: () => option,hover: () => {if (onHover) {onHover();}},collect: (monitor) => ({isOver: monitor.isOver(),canDrop: monitor.canDrop(),}),}));const isActive = canDrop && isOver;let backgroundColor = '#222';let borderBottom = '0px solid rgba(31, 92, 206, 0)';if (isActive) {backgroundColor = 'rgba(64, 224, 208, 0.3)';borderBottom = '1px solid #26BD11';} else if (canDrop) {backgroundColor = 'rgba(100, 149, 277, 0.3)';borderBottom = '1px solid #2063AF';}return (<divref={drop}role={'Acceptor'}style={styleType === 'background'? { backgroundColor }: { borderBottom }}>{option.content}</div>);
};
//同一list之间拖动
export const dragList = (list: Array<any>,crtIndex: number,willIndex: number,
) => {let targetItem = list[crtIndex];let delIndex = crtIndex < willIndex ? crtIndex : crtIndex + 1;list.splice(willIndex, 0, targetItem);list.splice(delIndex, 1);return list;
};
//来自不同list之间拖动，1.删除原来 2不删除原来
export const dragToList = (list: Array<any>,targetList: Array<any>,crtIndex: number,willIndex: number,del: 1 | 2,
) => {let targetItem = list[crtIndex];targetList.splice(willIndex, 0, targetItem);if (del === 1) {list.splice(crtIndex, 1);}return { list, targetList };
};
具体使用
import { Dragger, Acceptor, dragList } from '@/components/Drag';
//同列表之间拖曳handleDrag(crt: number, target: number) {conslog.log(dragList(newPanels, crt, target);)}renderDrag(item: ItemProps, children) {<Acceptorkey={item.type}name={item.title}data={item}type="xxx"role="xxxAccept"onHover={() => {}}content={<Draggername={item.title}data={item}type="xxx"role="xxxDrag"content={children}onDragFinished={(source: any, target: any) => {console.log(source, target, '回调');if (target) {this.handleDrag(source.data.sort,target.data.sort,);}}}/>}styleType="border"/>}
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