iter(g75): 评分组件键盘可达性与焦点保持
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@@ -7,6 +7,14 @@ export function rate(props: RateProps): HTMLDivElement {
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const max = props.max ?? 5; // 星标总数缺省 5
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const hover = signal(0); // 预览索引(1 基,0 表示无预览)
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const emit = (v: number): void => { const n = Math.min(max, Math.max(1, v)); value(n); if (props.onChange) props.onChange(n); }; // 写回信号并回调
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/*** 键盘调节:focus 在整组上,方向键步进一分(重渲染后仍生效) ***/
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const keyNav = (e: KeyboardEvent): void => {
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if (e.key !== 'ArrowLeft' && e.key !== 'ArrowRight' && e.key !== 'ArrowUp' && e.key !== 'ArrowDown') return; // 卫语句:只拦截方向键
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e.preventDefault();
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emit(value() + (e.key === 'ArrowRight' || e.key === 'ArrowUp' ? 1 : -1)); // →/↑ 加一分,←/↓ 减一分
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};
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const render = (): HTMLElement => {
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const shown = hover() || value(); // 预览优先,无预览显示当前值
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const stars = [];
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@@ -20,15 +28,20 @@ export function rate(props: RateProps): HTMLDivElement {
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onMouseEnter: () => hover(i),
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}, '★'));
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}
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return h('div', { class: 'ua-rate', role: 'slider', 'aria-label': '评分', 'aria-valuemin': 1, 'aria-valuemax': max, 'aria-valuenow': value(), onMouseLeave: () => hover(0) }, ...stars);
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const node = h('div', { class: 'ua-rate', role: 'slider', tabindex: '0', 'aria-label': '评分', 'aria-valuemin': 1, 'aria-valuemax': max, 'aria-valuenow': value(), onMouseLeave: () => hover(0) }, ...stars) as HTMLDivElement;
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node.addEventListener('keydown', keyNav); // 每次渲染都挂:节点被替换后键盘仍可用
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return node;
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};
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let el!: HTMLElement; // 当前渲染产物(effect 首跑赋值)
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effect(() => { const next = render(); if (el) el.replaceWith(next); el = next; }); // value/hover 变化整条重渲染(星标少,开销可忽略)
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const keyNav = (e: KeyboardEvent): void => {
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if (e.key !== 'ArrowLeft' && e.key !== 'ArrowRight' && e.key !== 'ArrowUp' && e.key !== 'ArrowDown') return; // 卫语句:只拦截方向键
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e.preventDefault();
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emit(value() + (e.key === 'ArrowRight' || e.key === 'ArrowUp' ? 1 : -1)); // →/↑ 加一分,←/↓ 减一分
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};
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el.addEventListener('keydown', keyNav);
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effect(() => {
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const next = render();
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if (el) {
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const hadFocus = el.contains(document.activeElement); // 重渲染前焦点是否在本组内
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el.replaceWith(next);
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if (hadFocus) (next as HTMLElement).focus(); // 归还焦点,方向键可继续连按
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}
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el = next;
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}); // value/hover 变化整条重渲染(星标少,开销可忽略)
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return el as HTMLDivElement;
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}
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