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"
/>
}
