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All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\nimport {Collection, CollectionStateBase, Key, LayoutDelegate, Node} from '@react-types/shared';\nimport {ListCollection} from './ListCollection';\nimport {MultipleSelectionStateProps, SelectionManager, useMultipleSelectionState} from '@react-stately/selection';\nimport {useCallback, useEffect, useMemo, useRef} from 'react';\nimport {useCollection} from '@react-stately/collections';\n\nexport interface ListProps<T> extends CollectionStateBase<T>, MultipleSelectionStateProps {\n /** Filter function to generate a filtered list of nodes. */\n filter?: (nodes: Iterable<Node<T>>) => Iterable<Node<T>>,\n /** @private */\n suppressTextValueWarning?: boolean,\n /**\n * A delegate object that provides layout information for items in the collection.\n * This can be used to override the behavior of shift selection.\n */\n layoutDelegate?: LayoutDelegate\n}\n\nexport interface ListState<T> {\n /** A collection of items in the list. */\n collection: Collection<Node<T>>,\n\n /** A set of items that are disabled. */\n disabledKeys: Set<Key>,\n\n /** A selection manager to read and update multiple selection state. */\n selectionManager: SelectionManager\n}\n\n/**\n * Provides state management for list-like components. Handles building a collection\n * of items from props, and manages multiple selection state.\n */\nexport function useListState<T extends object>(props: ListProps<T>): ListState<T> {\n let {filter, layoutDelegate} = props;\n\n let selectionState = useMultipleSelectionState(props);\n let disabledKeys = useMemo(() =>\n props.disabledKeys ? new Set(props.disabledKeys) : new Set<Key>()\n , [props.disabledKeys]);\n\n let factory = useCallback(nodes => filter ? new ListCollection(filter(nodes)) : new ListCollection(nodes as Iterable<Node<T>>), [filter]);\n let context = useMemo(() => ({suppressTextValueWarning: props.suppressTextValueWarning}), [props.suppressTextValueWarning]);\n\n let collection = useCollection(props, factory, context);\n\n let selectionManager = useMemo(() =>\n new SelectionManager(collection, selectionState, {layoutDelegate})\n , [collection, selectionState, layoutDelegate]\n );\n\n useFocusedKeyReset(collection, selectionManager);\n\n return {\n collection,\n disabledKeys,\n selectionManager\n };\n}\n\n/**\n * Filters a collection using the provided filter function and returns a new ListState.\n */\nexport function UNSTABLE_useFilteredListState<T extends object>(state: ListState<T>, filterFn: ((nodeValue: string, node: Node<T>) => boolean) | null | undefined): ListState<T> {\n let collection = useMemo(() => filterFn ? state.collection.filter!(filterFn) : state.collection, [state.collection, filterFn]);\n let selectionManager = state.selectionManager.withCollection(collection);\n useFocusedKeyReset(collection, selectionManager);\n return {\n collection,\n selectionManager,\n disabledKeys: state.disabledKeys\n };\n}\n\nfunction useFocusedKeyReset<T>(collection: Collection<Node<T>>, selectionManager: SelectionManager) {\n // Reset focused key if that item is deleted from the collection.\n const cachedCollection = useRef<Collection<Node<T>> | null>(null);\n useEffect(() => {\n if (selectionManager.focusedKey != null && !collection.getItem(selectionManager.focusedKey) && cachedCollection.current) {\n const startItem = cachedCollection.current.getItem(selectionManager.focusedKey);\n const cachedItemNodes = [...cachedCollection.current.getKeys()].map(\n key => {\n const itemNode = cachedCollection.current!.getItem(key);\n return itemNode?.type === 'item' ? itemNode : null;\n }\n ).filter(node => node !== null);\n const itemNodes = [...collection.getKeys()].map(\n key => {\n const itemNode = collection.getItem(key);\n return itemNode?.type === 'item' ? itemNode : null;\n }\n ).filter(node => node !== null);\n const diff: number = (cachedItemNodes?.length ?? 0) - (itemNodes?.length ?? 0);\n let index = Math.min(\n (\n diff > 1 ?\n Math.max((startItem?.index ?? 0) - diff + 1, 0) :\n startItem?.index ?? 0\n ),\n (itemNodes?.length ?? 0) - 1);\n let newNode: Node<T> | null = null;\n let isReverseSearching = false;\n while (index >= 0) {\n if (!selectionManager.isDisabled(itemNodes[index].key)) {\n newNode = itemNodes[index];\n break;\n }\n // Find next, not disabled item.\n if (index < itemNodes.length - 1 && !isReverseSearching) {\n index++;\n // Otherwise, find previous, not disabled item.\n } else {\n isReverseSearching = true;\n if (index > (startItem?.index ?? 0)) {\n index = (startItem?.index ?? 0);\n }\n index--;\n }\n }\n selectionManager.setFocusedKey(newNode ? newNode.key : null);\n }\n cachedCollection.current = collection;\n }, [collection, selectionManager]);\n}\n"],"names":[],"version":3,"file":"useListState.module.js.map"} |