@mui/x-tree-view/esm/internals/plugins/items/selectors.js

The community edition of the MUI X Tree View components.

import { createSelector } from '@mui/x-internals/store';
import { isItemDisabled, TREE_VIEW_ROOT_PARENT_ID } from "./utils.js";
const EMPTY_CHILDREN = [];
export const itemsSelectors = {
  /**
   * Gets the DOM structure of the Tree View.
   */
  domStructure: createSelector(state => state.domStructure),
  /**
   * Checks whether the disabled items are focusable.
   */
  disabledItemFocusable: createSelector(state => state.disabledItemsFocusable),
  /**
   * Gets the meta-information of all items.
   */
  itemMetaLookup: createSelector(state => state.itemMetaLookup),
  /**
   * Gets the ordered children ids of all items.
   */
  itemOrderedChildrenIdsLookup: createSelector(state => state.itemOrderedChildrenIdsLookup),
  /**
   * Gets the meta-information of an item.
   */
  itemMeta: createSelector((state, itemId) => state.itemMetaLookup[itemId ?? TREE_VIEW_ROOT_PARENT_ID] ?? null),
  /**
   * Gets the ordered children ids of an item.
   */
  itemOrderedChildrenIds: createSelector((state, itemId) => state.itemOrderedChildrenIdsLookup[itemId ?? TREE_VIEW_ROOT_PARENT_ID] ?? EMPTY_CHILDREN),
  /**
   * Gets the model of an item.
   */
  itemModel: createSelector((state, itemId) => state.itemModelLookup[itemId]),
  /**
   * Checks whether an item is disabled.
   */
  isItemDisabled: createSelector((state, itemId) => isItemDisabled(state.itemMetaLookup, itemId)),
  /**
   * Gets the index of an item in its parent's children.
   */
  itemIndex: createSelector((state, itemId) => {
    const itemMeta = state.itemMetaLookup[itemId];
    if (itemMeta == null) {
      return -1;
    }
    const parentIndexes = state.itemChildrenIndexesLookup[itemMeta.parentId ?? TREE_VIEW_ROOT_PARENT_ID];
    return parentIndexes[itemMeta.id];
  }),
  /**
   * Gets the id of an item's parent.
   */
  itemParentId: createSelector((state, itemId) => state.itemMetaLookup[itemId]?.parentId ?? null),
  /**
   * Gets the depth of an item (items at the root level have a depth of 0).
   */
  itemDepth: createSelector((state, itemId) => state.itemMetaLookup[itemId]?.depth ?? 0),
  /**
   * Checks whether an item can be focused.
   */
  canItemBeFocused: createSelector((state, itemId) => state.disabledItemsFocusable || !isItemDisabled(state.itemMetaLookup, itemId)),
  /**
   * Gets the identation between an item and its children.
   */
  itemChildrenIndentation: createSelector(state => state.itemChildrenIndentation)
};