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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 {announce} from '@react-aria/live-announcer';\nimport {Collection, Key, Node, Selection} from '@react-types/shared';\n// @ts-ignore\nimport intlMessages from '../intl/*.json';\nimport {SelectionManager} from '@react-stately/selection';\nimport {useEffectEvent, useUpdateEffect} from '@react-aria/utils';\nimport {useLocalizedStringFormatter} from '@react-aria/i18n';\nimport {useRef} from 'react';\n\nexport interface GridSelectionAnnouncementProps {\n /**\n * A function that returns the text that should be announced by assistive technology when a row is added or removed from selection.\n * @default (key) => state.collection.getItem(key)?.textValue\n */\n getRowText?: (key: Key) => string\n}\n\ninterface GridSelectionState<T> {\n /** A collection of items in the grid. */\n collection: Collection<Node<T>>,\n /** A set of items that are disabled. */\n disabledKeys: Set<Key>,\n /** A selection manager to read and update multiple selection state. */\n selectionManager: SelectionManager\n}\n\nexport function useGridSelectionAnnouncement<T>(props: GridSelectionAnnouncementProps, state: GridSelectionState<T>): void {\n let {\n getRowText = (key) => state.collection.getTextValue?.(key) ?? state.collection.getItem(key)?.textValue\n } = props;\n let stringFormatter = useLocalizedStringFormatter(intlMessages, '@react-aria/grid');\n\n // Many screen readers do not announce when items in a grid are selected/deselected.\n // We do this using an ARIA live region.\n let selection = state.selectionManager.rawSelection;\n let lastSelection = useRef(selection);\n let announceSelectionChange = useEffectEvent(() => {\n if (!state.selectionManager.isFocused || selection === lastSelection.current) {\n lastSelection.current = selection;\n\n return;\n }\n\n let addedKeys = diffSelection(selection, lastSelection.current);\n let removedKeys = diffSelection(lastSelection.current, selection);\n\n // If adding or removing a single row from the selection, announce the name of that item.\n let isReplace = state.selectionManager.selectionBehavior === 'replace';\n let messages: string[] = [];\n\n if ((state.selectionManager.selectedKeys.size === 1 && isReplace)) {\n let firstKey = state.selectionManager.selectedKeys.keys().next().value;\n if (firstKey != null && state.collection.getItem(firstKey)) {\n let currentSelectionText = getRowText(firstKey);\n if (currentSelectionText) {\n messages.push(stringFormatter.format('selectedItem', {item: currentSelectionText}));\n }\n }\n } else if (addedKeys.size === 1 && removedKeys.size === 0) {\n let firstKey = addedKeys.keys().next().value;\n if (firstKey != null) {\n let addedText = getRowText(firstKey);\n if (addedText) {\n messages.push(stringFormatter.format('selectedItem', {item: addedText}));\n }\n }\n } else if (removedKeys.size === 1 && addedKeys.size === 0) {\n let firstKey = removedKeys.keys().next().value;\n if (firstKey != null && state.collection.getItem(firstKey)) {\n let removedText = getRowText(firstKey);\n if (removedText) {\n messages.push(stringFormatter.format('deselectedItem', {item: removedText}));\n }\n }\n }\n\n // Announce how many items are selected, except when selecting the first item.\n if (state.selectionManager.selectionMode === 'multiple') {\n if (messages.length === 0 || selection === 'all' || selection.size > 1 || lastSelection.current === 'all' || lastSelection.current?.size > 1) {\n messages.push(selection === 'all'\n ? stringFormatter.format('selectedAll')\n : stringFormatter.format('selectedCount', {count: selection.size})\n );\n }\n }\n\n if (messages.length > 0) {\n announce(messages.join(' '));\n }\n\n lastSelection.current = selection;\n });\n\n useUpdateEffect(() => {\n if (state.selectionManager.isFocused) {\n announceSelectionChange();\n } else {\n // Wait a frame in case the collection is about to become focused (e.g. on mouse down).\n let raf = requestAnimationFrame(announceSelectionChange);\n return () => cancelAnimationFrame(raf);\n }\n }, [selection, state.selectionManager.isFocused]);\n}\n\nfunction diffSelection(a: Selection, b: Selection): Set<Key> {\n let res = new Set<Key>();\n if (a === 'all' || b === 'all') {\n return res;\n }\n\n for (let key of a.keys()) {\n if (!b.has(key)) {\n res.add(key);\n }\n }\n\n return res;\n}\n"],"names":[],"version":3,"file":"useGridSelectionAnnouncement.module.js.map"} |