HIsheR
62 lines
3.1 KiB
TypeScript
62 lines
3.1 KiB
TypeScript
import { effect, h } from '@ui-arch/frame';
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import type { DrawerProps } from './types.js';
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import { lockScroll, pushOverlay, trapFocus } from './overlay.js';
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let seq = 0; // 实例序号：给标题生成唯一 id，供 aria-labelledby 关联
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/*** 抽屉：open 信号驱动侧滑面板，点遮罩 / × / Esc 关闭；Tab 焦点陷阱 + 关闭归还焦点，与 modal 的分工是不打断主视图、可从侧边保留上下文 ***/
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export function drawer(props: DrawerProps, ...children: unknown[]): HTMLElement {
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const titleId = `ua-drawer-title-${++seq}`; // 标题 id：抽屉的可访问名
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const modal = props.modal !== false; // 是否模态：false 时无遮罩、不锁滚动、不困焦点，页面仍可操作
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const close = (): void => {
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if (!props.open()) return; // 卫语句：已关闭不重复触发回调
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props.open(false);
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props.onClose?.();
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};
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const overlay = h('div', {
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class: () => `ua-drawer-overlay${props.open() ? ' ua-open' : ''}${modal ? '' : ' is-plain'}`,
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onClick: (e: Event) => {
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if (!modal) return; // 卫语句：非模态没有遮罩，点外面不算关闭
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if (e.target !== overlay) return; // 卫语句：只处理点在遮罩本身的
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if (props.closeOnOverlay === false) return; // 显式禁止时防误关，× 与 Esc 仍可用
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close();
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},
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});
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const panel = h(
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'aside',
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{
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class: `ua-drawer ua-drawer-${props.placement ?? 'right'}`,
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style: `${props.placement === 'top' || props.placement === 'bottom' ? 'height' : 'width'}:${props.width ?? 320}px`, // 上下滑出改高度
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role: 'dialog',
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'aria-labelledby': titleId,
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'aria-hidden': () => String(!props.open()),
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'aria-modal': modal ? 'true' : 'false',
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},
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h('div', { class: 'ua-drawer-head' }, h('h3', { class: 'ua-drawer-title', id: titleId }, props.title), h('button', { class: 'ua-drawer-close', 'aria-label': '关闭抽屉', onClick: close }, '×')),
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h('div', { class: 'ua-drawer-body' }, ...children),
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props.footer ? h('div', { class: 'ua-drawer-foot' }, props.footer) : null,
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);
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overlay.append(panel);
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let lastFocus: HTMLElement | null = null; // 打开前焦点宿主，关闭时归还
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let release: (() => void) | null = null; // Esc 栈注销函数，关闭时释放
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let releaseLock: (() => void) | null = null; // 背景滚动锁解锁函数，全关才还原
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effect(() => {
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if (props.open()) {
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lastFocus = document.activeElement as HTMLElement | null; // 记录打开前焦点
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release ??= pushOverlay(close); // 入 Esc 栈：多弹层时只关最上层
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if (modal) releaseLock ??= lockScroll(); // 仅模态期锁背景滚动
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(panel.querySelector('button, input, textarea') as HTMLElement | null)?.focus(); // 打开时聚焦首个可交互元素
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} else {
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release?.(); // 出 Esc 栈
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release = null;
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releaseLock?.(); // 解锁背景滚动
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releaseLock = null;
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lastFocus?.focus(); // 关闭时归还焦点
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lastFocus = null;
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}
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});
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if (modal) trapFocus(panel, () => props.open()); // 模态才困焦点：非模态要让用户能继续操作背后页面
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return overlay;
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}
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