124 lines
3.1 KiB
Markdown
124 lines
3.1 KiB
Markdown
<cn>
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#### 拖动示例
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将节点拖拽到其他节点内部或前后。
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</cn>
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<us>
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#### draggable
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Drag treeNode to insert after the other treeNode or insert into the other parent TreeNode.
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</us>
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```html
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<template>
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<a-tree
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class="draggable-tree"
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:defaultExpandedKeys="expandedKeys"
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draggable
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@dragenter="onDragEnter"
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@drop="onDrop"
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:treeData="gData"
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/>
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</template>
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<script>
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const x = 3;
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const y = 2;
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const z = 1;
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const gData = [];
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const generateData = (_level, _preKey, _tns) => {
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const preKey = _preKey || '0';
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const tns = _tns || gData;
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const children = [];
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for (let i = 0; i < x; i++) {
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const key = `${preKey}-${i}`;
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tns.push({ title: key, key });
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if (i < y) {
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children.push(key);
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}
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}
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if (_level < 0) {
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return tns;
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}
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const level = _level - 1;
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children.forEach((key, index) => {
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tns[index].children = [];
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return generateData(level, key, tns[index].children);
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});
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};
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generateData(z);
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export default {
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data() {
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return {
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gData,
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expandedKeys: ['0-0', '0-0-0', '0-0-0-0'],
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};
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},
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methods: {
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onDragEnter(info) {
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console.log(info);
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// expandedKeys 需要受控时设置
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// this.expandedKeys = info.expandedKeys
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},
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onDrop(info) {
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console.log(info);
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const dropKey = info.node.eventKey;
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const dragKey = info.dragNode.eventKey;
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const dropPos = info.node.pos.split('-');
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const dropPosition = info.dropPosition - Number(dropPos[dropPos.length - 1]);
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const loop = (data, key, callback) => {
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data.forEach((item, index, arr) => {
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if (item.key === key) {
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return callback(item, index, arr);
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}
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if (item.children) {
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return loop(item.children, key, callback);
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}
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});
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};
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const data = [...this.gData];
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// Find dragObject
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let dragObj;
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loop(data, dragKey, (item, index, arr) => {
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arr.splice(index, 1);
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dragObj = item;
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});
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if (!info.dropToGap) {
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// Drop on the content
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loop(data, dropKey, item => {
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item.children = item.children || [];
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// where to insert 示例添加到尾部，可以是随意位置
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item.children.push(dragObj);
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});
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} else if (
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(info.node.children || []).length > 0 && // Has children
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info.node.expanded && // Is expanded
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dropPosition === 1 // On the bottom gap
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) {
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loop(data, dropKey, item => {
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item.children = item.children || [];
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// where to insert 示例添加到尾部，可以是随意位置
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item.children.unshift(dragObj);
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});
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} else {
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let ar;
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let i;
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loop(data, dropKey, (item, index, arr) => {
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ar = arr;
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i = index;
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});
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if (dropPosition === -1) {
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ar.splice(i, 0, dragObj);
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} else {
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ar.splice(i + 1, 0, dragObj);
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}
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}
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this.gData = data;
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},
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},
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};
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</script>
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```
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