HIsheR
63 lines
3.2 KiB
TypeScript
63 lines
3.2 KiB
TypeScript
import { effect, h } from '@ui-arch/frame';
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import type { ModalProps } from './types.js';
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import { lockScroll, pushOverlay } from './overlay.js';
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/*** 弹窗：open 信号驱动显隐，点遮罩、× 或 Esc 触发 onClose；Tab 焦点陷阱 + 关闭归还焦点 ***/
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export function modal(props: ModalProps, ...children: unknown[]): HTMLElement {
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const close = () => {
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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); // 写回信号触发隐藏
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props.onClose?.();
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};
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const overlay = h('div', {
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class: 'ua-modal-overlay',
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onClick: (e: Event) => {
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if (e.target === overlay) close(); // 卫语句：仅点遮罩本身关闭
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},
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});
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const box = h(
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'div',
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{ class: `ua-modal ua-modal-${props.size ?? 'md'}`, role: 'dialog', 'aria-modal': 'true' }, // 对话框语义，供读屏识别
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h('div', { class: 'ua-modal-head' }, h('h3', { class: 'ua-modal-title' }, props.title), h('button', { type: 'button', class: 'ua-modal-close', 'aria-label': '关闭弹窗', onClick: close }, '×')),
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h('div', { class: 'ua-modal-body' }, ...children),
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props.footer ? h('div', { class: 'ua-modal-foot' }, props.footer) : null, // 底部操作区：右对齐，仅传了才渲染
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);
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overlay.append(box);
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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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const focusables = (): HTMLElement[] =>
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Array.from(box.querySelectorAll<HTMLElement>('button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'))
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.filter((el) => !el.hasAttribute('disabled')); // 弹窗内可聚焦元素（排除禁用）
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effect(() => {
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const open = props.open();
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overlay.classList.toggle('ua-open', open); // 显隐跟随信号
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if (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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releaseLock ??= lockScroll(); // 模态期锁背景滚动
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(box.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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overlay.addEventListener('keydown', (e: KeyboardEvent) => {
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if (e.key !== 'Tab' || !props.open()) return; // 仅处理打开中的 Tab
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const els = focusables();
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if (els.length === 0) { e.preventDefault(); return; } // 无可聚焦元素：拦截 Tab 防焦点逃逸
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const first = els[0];
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const last = els[els.length - 1];
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if (e.shiftKey && (document.activeElement === first || !box.contains(document.activeElement))) {
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e.preventDefault(); last.focus(); // Shift+Tab 到首位时回绕到末尾
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} else if (!e.shiftKey && (document.activeElement === last || !box.contains(document.activeElement))) {
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e.preventDefault(); first.focus(); // Tab 到末位时回绕到开头
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}
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});
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return overlay;
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}
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