133 lines
3.5 KiB
TypeScript
133 lines
3.5 KiB
TypeScript
import {
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JSX,
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FunctionComponent,
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Ref,
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ComponentChildren,
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VNode,
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RefCallback,
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ComponentChild,
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} from 'preact';
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import { useEffect, useRef, useState } from 'preact/hooks';
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import { JSXInternal } from 'preact/src/jsx';
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import { forwardRef } from 'preact/compat';
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import { MenuItem, MenuItemListElement } from './MenuItem';
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type MenuProps = {
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className?: string;
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style?: string | JSX.CSSProperties | undefined;
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a11yLabel: string;
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children: ComponentChildren;
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closeMenu: () => void;
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};
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export const Menu: FunctionComponent<MenuProps> = forwardRef(
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(
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{ children, className = '', style, a11yLabel, closeMenu },
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ref: Ref<HTMLMenuElement>
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) => {
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const [currentIndex, setCurrentIndex] = useState(0);
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const menuItemRefs = useRef<(HTMLButtonElement | null)[]>([]);
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const handleKeyDown: JSXInternal.KeyboardEventHandler<HTMLMenuElement> = (
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event
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) => {
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switch (event.key) {
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case 'Home':
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setCurrentIndex(0);
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break;
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case 'End':
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setCurrentIndex(
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menuItemRefs.current.length ? menuItemRefs.current.length - 1 : 0
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);
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break;
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case 'ArrowDown':
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setCurrentIndex((index) => {
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if (index + 1 < menuItemRefs.current.length) {
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return index + 1;
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} else {
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return 0;
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}
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});
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break;
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case 'ArrowUp':
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setCurrentIndex((index) => {
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if (index - 1 > -1) {
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return index - 1;
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} else {
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return menuItemRefs.current.length - 1;
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}
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});
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break;
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case 'Escape':
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closeMenu();
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break;
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}
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};
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useEffect(() => {
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if (menuItemRefs.current[currentIndex]) {
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menuItemRefs.current[currentIndex]?.focus();
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}
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}, [currentIndex]);
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const pushRefToArray: RefCallback<HTMLLIElement> = (instance) => {
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if (instance && instance.children) {
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Array.from(instance.children).forEach((child) => {
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if (
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child.getAttribute('role')?.includes('menuitem') &&
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!menuItemRefs.current.includes(child as HTMLButtonElement)
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) {
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menuItemRefs.current.push(child as HTMLButtonElement);
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}
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});
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}
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};
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const mapMenuItems = (
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child: ComponentChild,
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index: number,
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array: ComponentChild[]
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) => {
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if (!child) return;
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const _child = child as VNode<unknown>;
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const isFirstMenuItem =
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index ===
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array.findIndex((child) => (child as VNode<unknown>).type === MenuItem);
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const hasMultipleItems = Array.isArray(_child.props.children)
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? Array.from(_child.props.children as ComponentChild[]).some(
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(child) => (child as VNode<unknown>).type === MenuItem
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)
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: false;
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const items = hasMultipleItems
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? [...(_child.props.children as ComponentChild[])]
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: [_child];
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return items.map((child) => {
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return (
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<MenuItemListElement
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isFirstMenuItem={isFirstMenuItem}
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ref={pushRefToArray}
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>
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{child}
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</MenuItemListElement>
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);
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});
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};
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return (
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<menu
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className={`m-0 p-0 list-style-none ${className}`}
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onKeyDown={handleKeyDown}
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ref={ref}
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style={style}
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aria-label={a11yLabel}
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>
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{Array.isArray(children) ? children.map(mapMenuItems) : null}
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</menu>
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);
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}
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);
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