ant-design-vue/es/tree/util.js

An enterprise-class UI design language and Vue-based implementation

import { getNodeChildren, convertTreeToEntities } from '../vc-tree/src/util';
import { getSlots } from '../_util/props-util';

var Record = {
  None: 'node',
  Start: 'start',
  End: 'end'

  // TODO: Move this logic into `rc-tree`
};function traverseNodesKey(rootChildren, callback) {
  var nodeList = getNodeChildren(rootChildren) || [];

  function processNode(node) {
    var key = node.key;

    var children = getSlots(node)['default'];
    if (callback(key) !== false) {
      traverseNodesKey(children, callback);
    }
  }

  nodeList.forEach(processNode);
}

export function getFullKeyList(children) {
  var _convertTreeToEntitie = convertTreeToEntities(children),
      keyEntities = _convertTreeToEntitie.keyEntities;

  return Object.keys(keyEntities);
}

/** 计算选中范围，只考虑expanded情况以优化性能 */
export function calcRangeKeys(rootChildren, expandedKeys, startKey, endKey) {
  var keys = [];
  var record = Record.None;

  if (startKey && startKey === endKey) {
    return [startKey];
  }
  if (!startKey || !endKey) {
    return [];
  }

  function matchKey(key) {
    return key === startKey || key === endKey;
  }

  traverseNodesKey(rootChildren, function (key) {
    if (record === Record.End) {
      return false;
    }

    if (matchKey(key)) {
      // Match test
      keys.push(key);

      if (record === Record.None) {
        record = Record.Start;
      } else if (record === Record.Start) {
        record = Record.End;
        return false;
      }
    } else if (record === Record.Start) {
      // Append selection
      keys.push(key);
    }

    if (expandedKeys.indexOf(key) === -1) {
      return false;
    }

    return true;
  });

  return keys;
}