68 lines
2.4 KiB
JavaScript
68 lines
2.4 KiB
JavaScript
'use client';
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import * as React from 'react';
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import { unstable_useId as useId } from '@mui/utils';
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import { ListContext } from '../useList';
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/**
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* Stabilizes the ListContext value for the MenuItem component, so it doesn't change when sibling items update.
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*
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* @param id The id of the MenuItem. If undefined, it will be generated with useId.
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* @returns The stable ListContext value and the id of the MenuItem.
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*
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* Demos:
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*
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* - [Menu](https://mui.com/base-ui/react-menu/#hooks)
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*
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* API:
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*
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* - [useMenuItemContextStabilizer API](https://mui.com/base-ui/react-menu/hooks-api/#use-menu-item-context-stabilizer)
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*/
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export function useMenuItemContextStabilizer(id) {
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var listContext = React.useContext(ListContext);
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if (!listContext) {
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throw new Error('MenuItem: ListContext was not found.');
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}
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var itemId = useId(id);
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var getItemState = listContext.getItemState,
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dispatch = listContext.dispatch;
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var itemState;
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if (itemId != null) {
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itemState = getItemState(itemId);
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} else {
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itemState = {
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focusable: true,
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highlighted: false,
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selected: false
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};
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}
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var _itemState = itemState,
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highlighted = _itemState.highlighted,
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selected = _itemState.selected,
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focusable = _itemState.focusable; // The local version of getItemState can be only called with the current Option's value.
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// It doesn't make much sense to render an Option depending on other Options' state anyway.
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var localGetItemState = React.useCallback(function (itemValue) {
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if (itemValue !== itemId) {
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throw new Error(['Base UI MenuItem: Tried to access the state of another MenuItem.', "itemValue: ".concat(itemValue, " | id: ").concat(itemId), 'This is unsupported when the MenuItem uses the MenuItemContextStabilizer as a performance optimization.'].join('/n'));
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}
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return {
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highlighted: highlighted,
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selected: selected,
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focusable: focusable
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};
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}, [highlighted, selected, focusable, itemId]);
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// Create a local (per MenuItem) instance of the ListContext that changes only when
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// the getItemState's return value changes.
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// This makes MenuItems re-render only when their state actually change, not when any MenuItem's state changes.
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var localContextValue = React.useMemo(function () {
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return {
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dispatch: dispatch,
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getItemState: localGetItemState
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};
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}, [dispatch, localGetItemState]);
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return {
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contextValue: localContextValue,
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id: itemId
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};
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} |