@mui/x-data-grid-pro/esm/hooks/features/treeData/treeDataReorderValidator.js

The Pro plan edition of the MUI X Data Grid components.

import { gridRowTreeSelector } from '@mui/x-data-grid';
import { RowReorderValidator } from "../rowReorder/reorderValidator.js";
import { commonReorderConditions as conditions } from "../rowReorder/commonReorderConditions.js";
const validationRules = [{
  name: 'same-position',
  applies: ctx => ctx.sourceNode.id === ctx.targetNode.id,
  isInvalid: () => true,
  message: 'Source and target are the same'
}, {
  name: 'adjacent-position',
  applies: ctx => conditions.isAdjacentPosition(ctx),
  isInvalid: () => true,
  message: 'Source and target are adjacent'
}, {
  name: 'to-descendent',
  applies: ctx => conditions.isGroupToLeaf(ctx) || conditions.isGroupToGroup(ctx),
  isInvalid: ctx => {
    let currentNode = ctx.targetNode;
    const rowTree = gridRowTreeSelector(ctx.apiRef);
    while (currentNode.parent) {
      currentNode = rowTree[currentNode.parent];
      if (currentNode.id === ctx.sourceNode.id) {
        return true;
      }
    }
    return false;
  },
  message: 'Cannot drop group on one of its descendents'
}, {
  name: 'group-to-group-above-leaf-belongs-to-source',
  applies: ctx => conditions.isGroupToGroup(ctx) && conditions.isDropAbove(ctx) && conditions.prevIsLeaf(ctx),
  isInvalid: conditions.prevBelongsToSource,
  message: 'Previous leaf belongs to source group or its descendants'
}];
export const treeDataReorderValidator = new RowReorderValidator(validationRules);