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 (
        <div
            ref={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 (
        <div
            ref={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) {
    <Acceptor
                    key={item.type}
                    name={item.title}
                    data={item}
                    type="xxx"
                    role="xxxAccept"
                    onHover={() => {}}
                    content={
                        <Dragger
                            name={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"
                />
                
       }