@carbon/react/lib/internal/usePresenceContext.js

React components for the Carbon Design System

/**
 * Copyright IBM Corp. 2016, 2023
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */

'use strict';

var React = require('react');
var usePresence = require('./usePresence.js');

/**
 * Returns if the presence node is present and the context value to be used by a presence context, e.g. ModalPresence.
 */
const usePresenceContext = (open, initialPresenceId) => {
  const presenceIdRef = React.useRef(initialPresenceId);
  const presenceRef = React.useRef(null);
  const prevPresenceRef = React.useRef(null);

  // clean up the presence id, if not predefined and if the presence node was unmounted
  if (!initialPresenceId && prevPresenceRef.current && !presenceRef.current) {
    presenceIdRef.current = null;
  }
  prevPresenceRef.current = presenceRef.current;
  const {
    isPresent,
    isExiting
  } = usePresence.usePresence(presenceRef, open);
  const isPresenceExclusive = React.useCallback(id => {
    if (!id) return false;

    // return false if the presence context is occupied
    if (presenceIdRef.current && presenceIdRef.current !== id) return false;

    // otherwise occupy presence context and return true
    presenceIdRef.current = id;
    return true;
  }, []);
  const contextValue = React.useMemo(() => ({
    presenceRef,
    isPresenceExclusive,
    isExiting
  }), [presenceRef, isPresenceExclusive, isExiting]);
  return [isPresent, contextValue];
};

exports.usePresenceContext = usePresenceContext;