ui-arch-bot
84 lines
3.0 KiB
TypeScript
84 lines
3.0 KiB
TypeScript
import { effect, h, signal } from '@ui-arch/frame';
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import type { MenuItem, MenuProps } from './types.js';
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/*** 下拉菜单：触发器 + 自绘弹层，项支持禁用 / 危险 / 分隔线；点项 / 点外部 / Esc 关闭，↑↓ 环形导航 ***/
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export function menu(props: MenuProps): HTMLElement {
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// —— 状态集中声明 ——
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const open = signal(false); // 弹层开合
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const focusables: HTMLButtonElement[] = []; // 可聚焦项（跳过分隔线与禁用项），供键盘导航
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const pick = (item: MenuItem): void => {
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open(false); // 选中即收起
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props.onSelect?.(item.value);
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};
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// —— 菜单项：分隔线走独立分支，其余为原生 button 保证键盘可达 ——
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const rows = props.items.map((item) => {
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if (item.divider) return h('div', { class: 'ua-menu-divider', role: 'separator' });
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const btn = h(
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'button',
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{
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type: 'button',
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class: `ua-menu-item${item.danger ? ' is-danger' : ''}`,
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role: 'menuitem',
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disabled: item.disabled ? true : undefined,
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onClick: () => pick(item),
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},
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h('span', { class: 'ua-menu-label' }, item.label),
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item.shortcut ? h('kbd', { class: 'ua-menu-key' }, item.shortcut) : null, // 快捷键只做提示，不拦截按键
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) as HTMLButtonElement;
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if (!item.disabled) focusables.push(btn); // 禁用项不参与导航
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return btn;
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});
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const trigger = h(
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'button',
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{
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type: 'button',
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class: `ua-btn ua-btn-${props.variant ?? 'ghost'} ua-menu-trigger`,
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'aria-haspopup': 'menu',
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'aria-expanded': () => String(open()),
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onClick: () => open(!open()),
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},
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props.label,
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h('span', { class: 'ua-menu-caret' }, '▾'),
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);
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const pop = h(
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'div',
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{
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class: () => `ua-menu-pop${open() ? ' ua-open' : ''}${props.align === 'end' ? ' is-end' : ''}`,
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role: 'menu',
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},
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...rows,
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);
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const root = h('div', { class: () => `ua-menu${open() ? ' ua-open' : ''}` }, trigger, pop);
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root.addEventListener('keydown', (e: KeyboardEvent) => {
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if (e.key === 'Escape') {
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open(false);
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trigger.focus(); // 收起后焦点回到触发器，键盘流不断
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return;
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}
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if (e.key !== 'ArrowDown' && e.key !== 'ArrowUp') return; // 卫语句：只接管上下键
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e.preventDefault();
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if (!open()) {
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open(true);
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focusables[0]?.focus(); // 首次按下即展开并进首项
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return;
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}
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const at = focusables.indexOf(document.activeElement as HTMLButtonElement);
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const step = e.key === 'ArrowDown' ? 1 : -1;
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focusables[(at + step + focusables.length) % focusables.length]?.focus(); // 环形移动
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});
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document.addEventListener('click', (e) => {
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if (root.contains(e.target as Node)) return; // 卫语句：组件内点击不处理
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open(false); // 点外部收起
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});
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effect(() => open()); // 建立依赖，保证开合信号生效
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return root;
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}
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