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279 lines
9.1 KiB
Plaintext
279 lines
9.1 KiB
Plaintext
/*
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* Copyright 2023 Adobe. All rights reserved.
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* This file is licensed to you under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
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* OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/
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import {CollectionBuilder} from '@react-stately/collections';
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import {GridNode} from '@react-types/grid';
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import {Key} from '@react-types/shared';
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import {ReactElement, useMemo} from 'react';
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import {TableCollection} from './TableCollection';
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import {tableNestedRows} from '@react-stately/flags';
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import {TableState, TableStateProps, useTableState} from './useTableState';
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import {useControlledState} from '@react-stately/utils';
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export interface TreeGridState<T> extends TableState<T> {
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/** A set of keys for items that are expanded. */
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expandedKeys: 'all' | Set<Key>,
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/** Toggles the expanded state for a row by its key. */
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toggleKey(key: Key): void,
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/** The key map containing nodes representing the collection's tree grid structure. */
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keyMap: Map<Key, GridNode<T>>,
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/** The number of leaf columns provided by the user. */
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userColumnCount: number
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}
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export interface TreeGridStateProps<T> extends Omit<TableStateProps<T>, 'collection'> {
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/** The currently expanded keys in the collection (controlled). */
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UNSTABLE_expandedKeys?: 'all' | Iterable<Key>,
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/** The initial expanded keys in the collection (uncontrolled). */
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UNSTABLE_defaultExpandedKeys?: 'all' | Iterable<Key>,
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/** Handler that is called when items are expanded or collapsed. */
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UNSTABLE_onExpandedChange?: (keys: Set<Key>) => any
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}
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/**
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* Provides state management for a tree grid component. Handles building a collection
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* of columns and rows from props. In addition, it tracks and manages expanded rows, row selection, and sort order changes.
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*/
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export function UNSTABLE_useTreeGridState<T extends object>(props: TreeGridStateProps<T>): TreeGridState<T> {
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let {
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selectionMode = 'none',
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showSelectionCheckboxes,
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showDragButtons,
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UNSTABLE_expandedKeys: propExpandedKeys,
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UNSTABLE_defaultExpandedKeys: propDefaultExpandedKeys,
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UNSTABLE_onExpandedChange,
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children
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} = props;
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if (!tableNestedRows()) {
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throw new Error('Feature flag for table nested rows must be enabled to use useTreeGridState.');
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}
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let [expandedKeys, setExpandedKeys] = useControlledState(
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propExpandedKeys ? convertExpanded(propExpandedKeys) : undefined,
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propDefaultExpandedKeys ? convertExpanded(propDefaultExpandedKeys) : new Set(),
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UNSTABLE_onExpandedChange
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);
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let context = useMemo(() => ({
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showSelectionCheckboxes: showSelectionCheckboxes && selectionMode !== 'none',
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showDragButtons: showDragButtons,
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selectionMode,
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columns: []
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// eslint-disable-next-line react-hooks/exhaustive-deps
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}), [children, showSelectionCheckboxes, selectionMode, showDragButtons]);
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let builder = useMemo(() => new CollectionBuilder<T>(), []);
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let nodes = useMemo(() => builder.build({children: children as ReactElement<any>[]}, context), [builder, children, context]);
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let treeGridCollection = useMemo(() => {
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return generateTreeGridCollection<T>(nodes, {showSelectionCheckboxes, showDragButtons, expandedKeys});
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}, [nodes, showSelectionCheckboxes, showDragButtons, expandedKeys]);
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let onToggle = (key: Key) => {
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setExpandedKeys(toggleKey(expandedKeys, key, treeGridCollection));
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};
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let collection = useMemo(() => {
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return new TableCollection(treeGridCollection.tableNodes, null, context);
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}, [context, treeGridCollection.tableNodes]);
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let tableState = useTableState({...props, collection});
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return {
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...tableState,
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keyMap: treeGridCollection.keyMap,
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userColumnCount: treeGridCollection.userColumnCount,
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expandedKeys,
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toggleKey: onToggle
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};
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}
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function toggleKey<T>(currentExpandedKeys: 'all' | Set<Key>, key: Key, collection: TreeGridCollection<T>): Set<Key> {
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let updatedExpandedKeys: Set<Key>;
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if (currentExpandedKeys === 'all') {
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updatedExpandedKeys = new Set(collection.flattenedRows.filter(row => row.props.UNSTABLE_childItems || row.props.children.length > collection.userColumnCount).map(row => row.key));
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updatedExpandedKeys.delete(key);
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} else {
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updatedExpandedKeys = new Set(currentExpandedKeys);
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if (updatedExpandedKeys.has(key)) {
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updatedExpandedKeys.delete(key);
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} else {
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updatedExpandedKeys.add(key);
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}
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}
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return updatedExpandedKeys;
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}
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function convertExpanded(expanded: 'all' | Iterable<Key>): 'all' | Set<Key> {
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if (!expanded) {
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return new Set<Key>();
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}
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return expanded === 'all'
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? 'all'
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: new Set(expanded);
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}
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interface TreeGridCollectionOptions {
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showSelectionCheckboxes?: boolean,
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showDragButtons?: boolean,
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expandedKeys: 'all' | Set<Key>
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}
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interface TreeGridCollection<T> {
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keyMap: Map<Key, GridNode<T>>,
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tableNodes: GridNode<T>[],
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flattenedRows: GridNode<T>[],
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userColumnCount: number
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}
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function generateTreeGridCollection<T>(nodes, opts: TreeGridCollectionOptions): TreeGridCollection<T> {
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let {
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expandedKeys = new Set()
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} = opts;
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let body: GridNode<T> | null = null;
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let flattenedRows: GridNode<T>[] = [];
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let columnCount = 0;
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let userColumnCount = 0;
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let originalColumns: GridNode<T>[] = [];
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let keyMap = new Map();
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if (opts?.showSelectionCheckboxes) {
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columnCount++;
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}
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if (opts?.showDragButtons) {
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columnCount++;
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}
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let topLevelRows: GridNode<T>[] = [];
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let visit = (node: GridNode<T>) => {
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switch (node.type) {
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case 'body':
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body = node;
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keyMap.set(body.key, body);
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break;
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case 'column':
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if (!node.hasChildNodes) {
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userColumnCount++;
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}
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break;
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case 'item':
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topLevelRows.push(node);
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return;
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}
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for (let child of node.childNodes) {
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visit(child);
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}
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};
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for (let node of nodes) {
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if (node.type === 'column') {
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originalColumns.push(node);
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}
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visit(node);
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}
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columnCount += userColumnCount;
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// Update each grid node in the treegrid table with values specific to a treegrid structure. Also store a set of flattened row nodes for TableCollection to consume
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let globalRowCount = 0;
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let visitNode = (node: GridNode<T>, i?: number) => {
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// Clone row node and its children so modifications to the node for treegrid specific values aren't applied on the nodes provided
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// to TableCollection. Index, level, and parent keys are all changed to reflect a flattened row structure rather than the treegrid structure
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// values automatically calculated via CollectionBuilder
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if (node.type === 'item') {
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let childNodes: GridNode<T>[] = [];
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for (let child of node.childNodes) {
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if (child.type === 'cell') {
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let cellClone = {...child};
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if (cellClone.index + 1 === columnCount) {
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cellClone.nextKey = null;
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}
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childNodes.push({...cellClone});
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}
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}
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let clone: GridNode<T> = {...node, childNodes: childNodes, parentKey: body!.key, level: 1, index: globalRowCount++};
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flattenedRows.push(clone);
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}
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let newProps = {};
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// Assign indexOfType to cells and rows for aria-posinset
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if (node.type !== 'placeholder' && node.type !== 'column') {
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newProps['indexOfType'] = i;
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}
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// Use Object.assign instead of spread to preserve object reference for keyMap. Also ensures retrieving nodes
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// via .childNodes returns the same object as the one found via keyMap look up
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Object.assign(node, newProps);
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keyMap.set(node.key, node);
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let lastNode: GridNode<T> | null = null;
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let rowIndex = 0;
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for (let child of node.childNodes) {
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if (!(child.type === 'item' && expandedKeys !== 'all' && !expandedKeys.has(node.key))) {
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if (child.parentKey == null) {
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// if child is a cell/expanded row/column and the parent key isn't already established by the collection, match child node to parent row
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child.parentKey = node.key;
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}
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if (lastNode) {
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lastNode.nextKey = child.key;
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child.prevKey = lastNode.key;
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} else {
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child.prevKey = null;
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}
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if (child.type === 'item') {
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visitNode(child, rowIndex++);
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} else {
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// We enforce that the cells come before rows so can just reuse cell index
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visitNode(child, child.index);
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}
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lastNode = child;
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}
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}
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if (lastNode) {
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lastNode.nextKey = null;
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}
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};
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let last: GridNode<T> | null = null;
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for (let [i, node] of topLevelRows.entries()) {
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visitNode(node as GridNode<T>, i);
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if (last) {
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last.nextKey = node.key;
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node.prevKey = last.key;
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} else {
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node.prevKey = null;
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}
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last = node;
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}
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if (last) {
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last.nextKey = null;
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}
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return {
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keyMap,
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userColumnCount,
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flattenedRows,
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tableNodes: [...originalColumns, {...body!, childNodes: flattenedRows}]
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};
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}
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