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| 1 | +// https://blog.logrocket.com/building-accessible-menubar-component-react |
| 2 | + |
| 3 | +import classNames from 'classnames'; |
| 4 | +import PropTypes from 'prop-types'; |
| 5 | +import React, { useContext, useMemo } from 'react'; |
| 6 | +import TriangleIcon from '../../images/down-filled-triangle.svg'; |
| 7 | +import { MenuOpenContext, MenubarContext, ParentMenuContext } from './contexts'; |
| 8 | + |
| 9 | +export function useMenuProps(id) { |
| 10 | + const activeMenu = useContext(MenuOpenContext); |
| 11 | + |
| 12 | + const isOpen = id === activeMenu; |
| 13 | + |
| 14 | + const { createMenuHandlers } = useContext(MenubarContext); |
| 15 | + |
| 16 | + const handlers = useMemo(() => createMenuHandlers(id), [ |
| 17 | + createMenuHandlers, |
| 18 | + id |
| 19 | + ]); |
| 20 | + |
| 21 | + return { isOpen, handlers }; |
| 22 | +} |
| 23 | + |
| 24 | +/* ------------------------------------------------------------------------------------------------- |
| 25 | + * MenubarTrigger |
| 26 | + * -----------------------------------------------------------------------------------------------*/ |
| 27 | + |
| 28 | +function MenubarTrigger({ id, title, role, hasPopup, ...props }) { |
| 29 | + const { isOpen, handlers } = useMenuProps(id); |
| 30 | + |
| 31 | + return ( |
| 32 | + <button |
| 33 | + {...handlers} |
| 34 | + {...props} |
| 35 | + role={role} |
| 36 | + aria-haspopup={hasPopup} |
| 37 | + aria-expanded={isOpen} |
| 38 | + > |
| 39 | + <span className="nav__item-header">{title}</span> |
| 40 | + <TriangleIcon |
| 41 | + className="nav__item-header-triangle" |
| 42 | + focusable="false" |
| 43 | + aria-hidden="true" |
| 44 | + /> |
| 45 | + </button> |
| 46 | + ); |
| 47 | +} |
| 48 | + |
| 49 | +MenubarTrigger.propTypes = { |
| 50 | + id: PropTypes.string.isRequired, |
| 51 | + title: PropTypes.node.isRequired, |
| 52 | + role: PropTypes.string, |
| 53 | + hasPopup: PropTypes.oneOf(['menu', 'listbox', 'true']) |
| 54 | +}; |
| 55 | + |
| 56 | +MenubarTrigger.defaultProps = { |
| 57 | + role: 'menuitem', |
| 58 | + hasPopup: 'menu' |
| 59 | +}; |
| 60 | + |
| 61 | +/* ------------------------------------------------------------------------------------------------- |
| 62 | + * MenubarList |
| 63 | + * -----------------------------------------------------------------------------------------------*/ |
| 64 | + |
| 65 | +function MenubarList({ id, children, role, ...props }) { |
| 66 | + return ( |
| 67 | + <ul className="nav__dropdown" role={role} {...props}> |
| 68 | + <ParentMenuContext.Provider value={id}> |
| 69 | + {children} |
| 70 | + </ParentMenuContext.Provider> |
| 71 | + </ul> |
| 72 | + ); |
| 73 | +} |
| 74 | + |
| 75 | +MenubarList.propTypes = { |
| 76 | + id: PropTypes.string.isRequired, |
| 77 | + children: PropTypes.node, |
| 78 | + role: PropTypes.oneOf(['menu', 'listbox']) |
| 79 | +}; |
| 80 | + |
| 81 | +MenubarList.defaultProps = { |
| 82 | + children: null, |
| 83 | + role: 'menu' |
| 84 | +}; |
| 85 | + |
| 86 | +/* ------------------------------------------------------------------------------------------------- |
| 87 | + * MenubarSubmenu |
| 88 | + * -----------------------------------------------------------------------------------------------*/ |
| 89 | + |
| 90 | +function MenubarSubmenu({ |
| 91 | + id, |
| 92 | + title, |
| 93 | + children, |
| 94 | + triggerRole: customTriggerRole, |
| 95 | + listRole: customListRole, |
| 96 | + ...props |
| 97 | +}) { |
| 98 | + const { isOpen } = useMenuProps(id); |
| 99 | + |
| 100 | + const triggerRole = customTriggerRole || 'menuitem'; |
| 101 | + const listRole = customListRole || 'menu'; |
| 102 | + |
| 103 | + const hasPopup = listRole === 'listbox' ? 'listbox' : 'menu'; |
| 104 | + |
| 105 | + return ( |
| 106 | + <li className={classNames('nav__item', isOpen && 'nav__item--open')}> |
| 107 | + <MenubarTrigger |
| 108 | + id={id} |
| 109 | + title={title} |
| 110 | + role={triggerRole} |
| 111 | + hasPopup={hasPopup} |
| 112 | + {...props} |
| 113 | + /> |
| 114 | + <MenubarList id={id} role={listRole}> |
| 115 | + {children} |
| 116 | + </MenubarList> |
| 117 | + </li> |
| 118 | + ); |
| 119 | +} |
| 120 | + |
| 121 | +MenubarSubmenu.propTypes = { |
| 122 | + id: PropTypes.string.isRequired, |
| 123 | + title: PropTypes.node.isRequired, |
| 124 | + children: PropTypes.node, |
| 125 | + triggerRole: PropTypes.string, |
| 126 | + listRole: PropTypes.string |
| 127 | +}; |
| 128 | + |
| 129 | +MenubarSubmenu.defaultProps = { |
| 130 | + children: null, |
| 131 | + triggerRole: 'menuitem', |
| 132 | + listRole: 'menu' |
| 133 | +}; |
| 134 | + |
| 135 | +export default MenubarSubmenu; |
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