链接:
https://4x.ant.design/components/tree-cn/#components-tree-demo-draggable
请问,这段代码什么情况下会被执行?
((info.
node
as
any).props.children || []).length >
0
&& // Has children
(info.
node
as
any).props.expanded && // Is expanded
dropPosition ===
1
// On the bottom gap
loop(data, dropKey,
item
=> {
item
.children =
item
.children || [];
//
where
to
insert
示例添加到头部,可以是随意位置
item
.children.unshift(dragObj);
//
in
previous
version, we use
item
.children.push(dragObj)
to
insert
the
//
item
to
the
tail
of
the children
完整代码:
import { Tree } from 'antd';
import type { DataNode, TreeProps } from 'antd/es/tree';
import React, { useState } from 'react';
const x = 3;
const y = 2;
const z = 1;
const defaultData: DataNode[] = [];
const generateData = (_level: number, _preKey?: React.Key, _tns?: DataNode[]) => {
const preKey = _preKey || '0';
const tns = _tns || defaultData;
const children = [];
for (let i = 0; i < x; i++) {
const key = `${preKey}-${i}`;
tns.push({ title: key, key });
if (i < y) {
children.push(key);
if (_level < 0) {
return tns;
const level = _level - 1;
children.forEach((key, index) => {
tns[index].children = [];
return generateData(level, key, tns[index].children);
generateData(z);
const App: React.FC = () => {
const [gData, setGData] = useState(defaultData);
const [expandedKeys] = useState(['0-0', '0-0-0', '0-0-0-0']);
const onDragEnter: TreeProps['onDragEnter'] = info => {
console.log(info);
// expandedKeys 需要受控时设置
// setExpandedKeys(info.expandedKeys)
const onDrop: TreeProps['onDrop'] = info => {
console.log(info);
const dropKey = info.node.key;
const dragKey = info.dragNode.key;
const dropPos = info.node.pos.split('-');
const dropPosition = info.dropPosition - Number(dropPos[dropPos.length - 1]);
const loop = (
data: DataNode[],
key: React.Key,
callback: (node: DataNode, i: number, data: DataNode[]) => void,
) => {
for (let i = 0; i < data.length; i++) {
if (data[i].key === key) {
return callback(data[i], i, data);
if (data[i].children) {
loop(data[i].children!, key, callback);
const data = [...gData];
// Find dragObject
let dragObj: DataNode;
loop(data, dragKey, (item, index, arr) => {
arr.splice(index, 1);
dragObj = item;
if (!info.dropToGap) {
// Drop on the content
loop(data, dropKey, item => {
item.children = item.children || [];
// where to insert 示例添加到头部,可以是随意位置
item.children.unshift(dragObj);
} else if (
((info.node as any).props.children || []).length > 0 && // Has children
(info.node as any).props.expanded && // Is expanded
dropPosition === 1 // On the bottom gap
loop(data, dropKey, item => {
item.children = item.children || [];
// where to insert 示例添加到头部,可以是随意位置
item.children.unshift(dragObj);
// in previous version, we use item.children.push(dragObj) to insert the
// item to the tail of the children
} else {
let ar: DataNode[] = [];
let i: number;
loop(data, dropKey, (_item, index, arr) => {
ar = arr;
i = index;
if (dropPosition === -1) {
ar.splice(i!, 0, dragObj!);
} else {
ar.splice(i! + 1, 0, dragObj!);
setGData(data);
return (
className="draggable-tree"
defaultExpandedKeys={expandedKeys}
draggable
blockNode
onDragEnter={onDragEnter}
onDrop={onDrop}
treeData={gData}
export default App;
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