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Matches keep full ink with the matched span emphasized. Two-phase // exit (drift, then collapse) is pure CSS: an outer grid-rows 1fr->0fr // collapse delayed behind the inner drift. Combobox keyboard pattern: // ArrowUp/Down roves an active option, Enter selects, Escape clears. export interface ChaffWinnowItem { id: string; label: string; hint?: string; } export interface ChaffWinnowProps { /** the searchable items */ items: ChaffWinnowItem[]; /** input placeholder text */ placeholder?: string; /** accessible name for the search input */ label?: string; /** called with the chosen item when one is selected */ onSelect?: (item: ChaffWinnowItem) => void; /** extra classes merged onto the rendered root element */ className?: string; } function Highlight({ text, query }: { text: string; query: string }) { if (!query) return <>{text}; const i = text.toLowerCase().indexOf(query.toLowerCase()); if (i === -1) return <>{text}; return ( <> {text.slice(0, i)} {text.slice(i, i + query.length)} {text.slice(i + query.length)} ); } export function ChaffWinnow({ items, placeholder = "Search…", label = "Search", onSelect, className = "", }: ChaffWinnowProps) { const [query, setQuery] = useState(""); const [active, setActive] = useState(-1); const listId = useId(); const reduced = useRef( typeof window !== "undefined" && window.matchMedia("(prefers-reduced-motion: reduce)").matches, ).current; const q = query.trim(); const matched = useMemo(() => { if (!q) return new Set(items.map((it) => it.id)); const lq = q.toLowerCase(); return new Set( items .filter( (it) => it.label.toLowerCase().includes(lq) || it.hint?.toLowerCase().includes(lq), ) .map((it) => it.id), ); }, [items, q]); const visible = items.filter((it) => matched.has(it.id)); const clampedActive = Math.min(active, visible.length - 1); const onKeyDown = (e: React.KeyboardEvent) => { if (e.key === "ArrowDown") { e.preventDefault(); setActive((a) => Math.min((a < 0 ? -1 : Math.min(a, visible.length - 1)) + 1, visible.length - 1)); } else if (e.key === "ArrowUp") { e.preventDefault(); setActive((a) => Math.max(Math.min(a, visible.length - 1) - 1, 0)); } else if (e.key === "Enter" && clampedActive >= 0 && visible[clampedActive]) { e.preventDefault(); onSelect?.(visible[clampedActive]); } else if (e.key === "Escape") { setQuery(""); setActive(-1); } }; return (

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