@carbon/react/es/components/UIShell/Switcher.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.
 */

import { extends as _extends } from '../../_virtual/_rollupPluginBabelHelpers.js';
import React, { forwardRef, useRef, Children, isValidElement, cloneElement } from 'react';
import cx from 'classnames';
import { usePrefix } from '../../internal/usePrefix.js';
import { useMergedRefs } from '../../internal/useMergedRefs.js';
import PropTypes from 'prop-types';
import { AriaLabelPropType } from '../../prop-types/AriaPropTypes.js';
import SwitcherItem from './SwitcherItem.js';
import SwitcherDivider from './SwitcherDivider.js';

const Switcher = /*#__PURE__*/forwardRef((props, forwardRef) => {
  const switcherRef = useRef(null);
  const ref = useMergedRefs([switcherRef, forwardRef]);
  const prefix = usePrefix();
  const {
    'aria-label': ariaLabel,
    'aria-labelledby': ariaLabelledBy,
    className: customClassName,
    children,
    expanded
  } = props;
  const accessibilityLabel = {
    'aria-label': ariaLabel,
    'aria-labelledby': ariaLabelledBy
  };
  const className = cx(`${prefix}--switcher`, {
    [customClassName || '']: !!customClassName
  });
  const handleSwitcherItemFocus = ({
    currentIndex,
    direction
  }) => {
    const enabledIndices = Children.toArray(children).reduce((acc, child, i) => {
      if (/*#__PURE__*/isValidElement(child) && child.type === SwitcherItem && Object.keys(child.props).length) {
        acc.push(i);
      }
      return acc;
    }, []);
    const nextValidIndex = (() => {
      const nextIndex = enabledIndices.indexOf(currentIndex) + direction;
      switch (enabledIndices[nextIndex]) {
        case undefined:
          if (direction === -1) {
            return enabledIndices[enabledIndices.length - 1];
          }
          return enabledIndices[0];
        case 0:
          if (direction === 1) {
            return enabledIndices[1];
          }
        // eslint-disable-next-line   no-fallthrough -- https://github.com/carbon-design-system/carbon/issues/20452
        default:
          return enabledIndices[nextIndex];
      }
    })();
    const switcherItem = switcherRef.current?.children[nextValidIndex]?.children[0];
    if (switcherItem) {
      switcherItem.focus();
    }
  };
  const childrenWithProps = Children.toArray(children).map((child, index) => {
    if (/*#__PURE__*/isValidElement(child) && child.type === SwitcherItem) {
      return /*#__PURE__*/cloneElement(child, {
        handleSwitcherItemFocus,
        index,
        key: index,
        expanded
      });
    }
    if (/*#__PURE__*/isValidElement(child) && child.type === SwitcherDivider) {
      return /*#__PURE__*/cloneElement(child, {
        key: index
      });
    }
    return child;
  });
  return /*#__PURE__*/React.createElement("ul", _extends({
    ref: ref,
    className: className
  }, accessibilityLabel), childrenWithProps);
});
Switcher.displayName = 'Switcher';
Switcher.propTypes = {
  /**
   * Required props for accessibility label on the underlying menu
   */
  ...AriaLabelPropType,
  /**
   * expects to receive <SwitcherItem />
   */
  children: PropTypes.node.isRequired,
  /**
   * Optionally provide a custom class to apply to the underlying `<ul>` node
   */
  className: PropTypes.string,
  /**
   * Specify whether the panel is expanded
   */
  expanded: PropTypes.bool
};

export { Switcher as default };