HIsheR
38 lines
1.5 KiB
TypeScript
38 lines
1.5 KiB
TypeScript
import { h } from '@ui-arch/frame';
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import type { ImageProps } from './types.js';
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/*** 图片：缩略图展示，点击 / 回车打开遮罩大图预览（Esc 或点击遮罩关闭），样式只消费 --ua-* 令牌 ***/
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export function image(props: ImageProps): HTMLElement {
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const style = props.width ? `width:${props.width}px` : '';
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return h('img', {
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class: 'ua-image',
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src: props.src,
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alt: props.alt ?? '',
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style,
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tabindex: '0', // 可聚焦，键盘用户回车预览
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role: 'button',
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'aria-label': '预览图片',
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onclick: () => openViewer(props.src, props.alt),
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onkeydown: (e: KeyboardEvent) => e.key === 'Enter' && openViewer(props.src, props.alt),
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});
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}
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/*** 打开全屏遮罩预览层；关闭时自清理、解绑键盘并归还焦点 ***/
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function openViewer(src: string, alt?: string): void {
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const prev = document.activeElement as HTMLElement | null; // 焦点归还目标
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const mask = h(
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'div',
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{ class: 'ua-image-mask', role: 'dialog', 'aria-modal': 'true', 'aria-label': '图片预览' },
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h('img', { class: 'ua-image-full', src, alt: alt ?? '' }),
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);
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const close = () => {
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mask.remove(); // 卫语句式自清理：遮罩移除 + 键盘解绑 + 焦点归还
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document.removeEventListener('keydown', onKey);
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prev?.focus?.();
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};
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const onKey = (e: KeyboardEvent) => e.key === 'Escape' && close();
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mask.addEventListener('click', close);
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document.addEventListener('keydown', onKey);
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document.body.appendChild(mask);
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}
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