@gravity-ui/uikit/build/esm/components/useList/utils/flattenItems.js

Gravity UI base styling and components

import { getListItemId } from "./getListItemId.js";
import { getGroupItemId } from "./groupItemId.js";
import { isTreeItemGuard } from "./isTreeItemGuard.js";
export function flattenItems({ items, getItemId, expandedById = {}, }) {
    const rootIds = [];
    const visibleFlattenIds = [];
    const visit = (item, index, parentId) => {
        const groupedId = getGroupItemId(index, parentId);
        const id = getListItemId({ groupedId, item, getItemId });
        // only top level array
        if (!parentId) {
            rootIds.push(id);
        }
        visibleFlattenIds.push(id);
        if (isTreeItemGuard(item) && item.children) {
            // don't include collapsed groups
            const isCollapsed = id in expandedById && !expandedById[id];
            if (!isCollapsed) {
                for (let i = 0; i < item.children.length; i++) {
                    visit(item.children[i], i, id);
                }
            }
        }
    };
    for (let i = 0; i < items.length; i++) {
        visit(items[i], i);
    }
    const idToFlattenIndex = {};
    for (let i = 0; i < visibleFlattenIds.length; i++) {
        idToFlattenIndex[visibleFlattenIds[i]] = i;
    }
    return {
        rootIds,
        visibleFlattenIds,
        idToFlattenIndex,
    };
}
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