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A hairline mesh fans from a hub above the // chip row down to every chip; active facets read as taut, bright threads, // inactive ones as faint background lattice. Hovering a chip tightens its // own thread (sag reduces toward a straight line via a CSS transition on the // SVG path's `d` — same-topology path transitions animate natively in // Chromium, no rAF needed for a discrete hover response). Deselecting a // facet widens the results and shakes a few particles through the gap left // at that chip; the result count re-renders as a staggered dot bar, never a // tweened number. Chips are real toggle buttons (aria-pressed, visible // accessible names); the count changes announce through an sr-only region. type Facet = { key: string; label: string; factor: number }; const FACETS: Facet[] = [ { key: "in-stock", label: "In stock", factor: 0.72 }, { key: "new", label: "New", factor: 0.42 }, { key: "on-sale", label: "On sale", factor: 0.58 }, { key: "bestseller", label: "Bestseller", factor: 0.34 }, ]; const POOL = 240; const DOT_MAX = 16; const HUB_HEIGHT = 40; type Particle = { id: number; x: number }; let seq = 0; export function SieveFacets({ defaultActive = ["in-stock", "bestseller"], className = "", }: { /** facet ids checked at mount */ defaultActive?: string[]; /** extra classes merged onto the rendered root element */ className?: string; }) { const [active, setActive] = useState>(() => new Set(defaultActive)); const [hovered, setHovered] = useState(null); const [particles, setParticles] = useState([]); const [anchors, setAnchors] = useState>({}); const [rowWidth, setRowWidth] = useState(0); const rowRef = useRef(null); const chipRefs = useRef>({}); const liveRef = useRef(null); const reducedRef = useRef(false); useEffect(() => { reducedRef.current = window.matchMedia("(prefers-reduced-motion: reduce)").matches; }, []); const measure = useCallback(() => { const row = rowRef.current; if (!row) return; const rowRect = row.getBoundingClientRect(); const next: Record = {}; for (const f of FACETS) { const el = chipRefs.current[f.key]; if (el) { const r = el.getBoundingClientRect(); next[f.key] = r.left + r.width / 2 - rowRect.left; } } setAnchors(next); setRowWidth(rowRect.width); }, []); useLayoutEffect(() => { measure(); const row = rowRef.current; const ro = row ? new ResizeObserver(measure) : undefined; if (row && ro) ro.observe(row); window.addEventListener("resize", measure); return () => { ro?.disconnect(); window.removeEventListener("resize", measure); }; }, [measure]); const count = useMemo(() => { let c = POOL; for (const f of FACETS) if (active.has(f.key)) c *= f.factor; return Math.max(1, Math.round(c)); }, [active]); const filledDots = Math.min(DOT_MAX, Math.max(0, Math.round((count / POOL) * DOT_MAX))); const toggle = (key: string) => { const wasActive = active.has(key); const next = new Set(active); if (wasActive) next.delete(key); else next.add(key); setActive(next); if (wasActive) { // excluded results shake back through the gap this facet leaves const x = anchors[key] ?? rowWidth / 2; const spawned: Particle[] = reducedRef.current ? [] : Array.from({ length: 4 }, () => ({ id: ++seq, x: x + (Math.random() - 0.5) * 24 })); if (spawned.length) setParticles((p) => [...p, ...spawned]); } let nextCount = POOL; for (const f of FACETS) if (next.has(f.key)) nextCount *= f.factor; nextCount = Math.max(1, Math.round(nextCount)); if (liveRef.current) liveRef.current.textContent = `${nextCount} results`; }; const removeParticle = (id: number) => setParticles((p) => p.filter((x) => x.id !== id)); const allClear = active.size === 0; return (

{/* mesh: hairline threads from a hub down to each chip */} {/* particle overlay */}

{FACETS.map((f) => { const isActive = active.has(f.key); return ( ); })}

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