iter(g273): 新增区域加载遮罩组件
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import { effect, h } from '@ui-arch/frame';
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import { spinner } from './spinner.js';
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import type { LoadingProps } from './types.js';
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// 缺省延迟:120ms 内的请求不闪遮罩,否则「点了就闪一下」比不显示更闹
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const DELAY = 120;
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/*** 区域加载遮罩:包住一块内容,active 为真时盖上层遮罩 + 转圈 + 文案;带延迟出场,快请求不闪、慢请求必有反馈 ***/
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export function loading(props: LoadingProps, ...children: unknown[]): HTMLElement {
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const delay = props.delay ?? DELAY; // 延迟毫秒
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let timer = 0; // 延迟计时器
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const read = (): boolean => (typeof props.active === 'function' ? Boolean(props.active()) : props.active === true); // 布尔与信号同一口径
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const mask = h(
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'div',
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{ class: 'ua-loading-mask' },
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spinner({ size: props.spinnerSize ?? 20, label: props.text ?? '内容加载中' }), // 转圈自带 role=status,这里只用它的可访问名
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props.text ? h('span', { class: 'ua-loading-text' }, props.text) : null,
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);
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const wrap = h(
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'div',
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{ class: 'ua-loading' },
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h('div', { class: 'ua-loading-body' }, ...children), // 内容层:遮罩出现时整体降透明度,但仍留在原位不塌陷
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mask,
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);
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if (props.minHeight !== undefined) wrap.style.minHeight = `${props.minHeight}px`; // 内容为空时也要撑出高度,遮罩才盖得住
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/*** 状态落点:is-active 控制遮罩显隐,aria-busy 让读屏知道这块在等数据 ***/
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const paint = (on: boolean): void => {
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wrap.classList.toggle('is-active', on);
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wrap.setAttribute('aria-busy', String(on));
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};
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effect(() => {
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window.clearTimeout(timer);
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if (!read()) { paint(false); return; } // 关得快:立刻收,不等延迟
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timer = window.setTimeout(() => paint(true), delay); // 开得慢:先等一会儿,避免快速请求闪一下
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});
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paint(read()); // 首帧:初值为真时直接亮(延迟只管后续变化)
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return wrap;
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}
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