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The 2C02 PPU can only // evaluate 8 hardware sprites per scanline; a 9th object contending for that // scanline in a given frame is silently dropped from the frame entirely — // a hardware limit, not a software choice. Games with more on-screen objects // than that worked around it with SPRITE MULTIPLEXING: round-robin which // subset of contending objects gets the 8 available slots each frame, // cycling on a schedule so every object gets its turn some fraction of the // time. That round-robin rotation — not a static "+N" pill — is this // component's entire mechanic. // // SLOT_BUDGET = 8 fixed chip DOM nodes are rendered at all times (keyed by // slot index, never by item identity); a swap changes only which item a // slot currently shows. Everything about a swap — which slot is chosen, its // content, and its leave/arrive animation — runs imperatively off refs, not // React state, so ticking never re-renders the tree: no layout thrash, no // accessibility-tree churn, and the leave/arrive transition is driven by // real CSS transitions rather than a state machine racing a render. // // Cadence: real 8-bit multiplexing code cycled every few FRAMES (roughly // 130ms at 60fps), but reproduced at that literal rate on a screen it reads // as noise, not a legible mechanic, to anyone not already told what they're // looking at — a real usability failure, not a stylistic choice. This // component keeps the same round-robin/FIFO/pin-on-hover mechanic but at a // cadence and per-swap animation slow enough to actually watch: one slot // changes at a time, its old label visibly slides up and out, then the new // label visibly slides up and in, before the row rests again. // // Round-robin model: each of the SLOT_BUDGET slots tracks an `age` in ticks // since it last changed. Every SWAP_INTERVAL_MS, the single oldest // non-pinned, currently-idle slot is evicted (the item it held goes to the // back of a FIFO queue of every other contending item) and the item at the // front of that queue takes its place — exactly one item rotates in/out per // tick, not the whole overflow set reshuffling at once, so a full cycle // back to the starting arrangement takes N * SWAP_INTERVAL_MS for N items. // --------------------------------------------------------------------------- export interface OverflowChipItem { id: string; label: string; } export interface OverflowChipMuxProps { /** contending items — supply MORE than slotBudget to see multiplexing engage */ items?: OverflowChipItem[]; /** visible slot count — the real PPU per-scanline limit is 8 */ slotBudget?: number; /** ms between round-robin swaps — slow enough to visually track one slot at a time */ swapIntervalMs?: number; /** accessible label for the chip row's group role */ ariaLabel?: string; /** extra classes merged onto the rendered root element */ className?: string; /** inline styles merged onto the root element */ style?: CSSProperties; } interface Slot { itemIndex: number; pinned: boolean; age: number; phase: "idle" | "out" | "in"; } const SLOT_BUDGET = 8; // NES PPU sprites-per-scanline hardware limit const SWAP_INTERVAL_MS = 1100; // slow enough to watch one slot change at a time const OUT_MS = 220; // outgoing label's visible leave const IN_MS = 260; // incoming label's visible arrive const DEFAULT_ITEMS: OverflowChipItem[] = [ "goomba", "koopa", "piranha-plant", "buzzy-beetle", "lakitu", "spiny", "bullet-bill", "hammer-bro", "boo", "cheep-cheep", "podoboo", "blooper", "para-goomba", "dry-bones", ].map((label, i) => ({ id: `${i}-${label}`, label })); export function OverflowChipMux({ items = DEFAULT_ITEMS, slotBudget = SLOT_BUDGET, swapIntervalMs = SWAP_INTERVAL_MS, ariaLabel = "Tags", className = "", style, }: OverflowChipMuxProps) { const budget = Math.max(1, Math.min(slotBudget, items.length || 1)); const slotsRef = useRef([]); const buttonRefs = useRef<(HTMLButtonElement | null)[]>([]); const labelRefs = useRef<(HTMLSpanElement | null)[]>([]); useEffect(() => { if (items.length <= budget) { slotsRef.current = []; return; // no overflow — matches real hardware, which only drops the 9th sprite } const slots: Slot[] = Array.from({ length: budget }, (_, i) => ({ itemIndex: i, pinned: false, age: budget - i, phase: "idle", })); slotsRef.current = slots; let queue = items.slice(budget).map((_, i) => budget + i); const mq = window.matchMedia("(prefers-reduced-motion: reduce)"); let interval = 0; const outTimers: number[] = new Array(budget).fill(0); const inTimers: number[] = new Array(budget).fill(0); const rafs: number[] = new Array(budget).fill(0); const setLabelText = (i: number, itemIndex: number) => { const el = labelRefs.current[i]; const item = items[itemIndex]; if (el && item) el.textContent = item.label; }; // three explicit visual states, driven by real CSS transitions rather // than a keyframe, so "leave" and "arrive" are genuinely two separate, // watchable motions rather than one blink standing in for both const paint = (i: number, phase: "idle" | "out" | "in-start" | "in") => { const el = labelRefs.current[i]; if (!el) return; if (phase === "out") { el.style.transition = `opacity ${OUT_MS}ms ease-in, transform ${OUT_MS}ms ease-in`; el.style.opacity = "0"; el.style.transform = "translateY(-7px)"; } else if (phase === "in-start") { el.style.transition = "none"; el.style.opacity = "0"; el.style.transform = "translateY(7px)"; } else if (phase === "in") { void el.offsetHeight; // force the in-start style to commit before transitioning el.style.transition = `opacity ${IN_MS}ms ease-out, transform ${IN_MS}ms ease-out`; el.style.opacity = "1"; el.style.transform = "translateY(0)"; } else { el.style.transition = "none"; el.style.opacity = "1"; el.style.transform = "translateY(0)"; } }; const startSwap = (i: number) => { const slot = slots[i]; if (!slot) return; slot.phase = "out"; paint(i, "out"); outTimers[i] = window.setTimeout(() => { const nextItemIndex = queue.shift(); if (nextItemIndex === undefined) return; queue.push(slot.itemIndex); slot.itemIndex = nextItemIndex; setLabelText(i, nextItemIndex); paint(i, "in-start"); rafs[i] = requestAnimationFrame(() => paint(i, "in")); inTimers[i] = window.setTimeout(() => { slot.phase = "idle"; slot.age = 0; }, IN_MS); }, OUT_MS); }; const tick = () => { let evictIdx = -1; let maxAge = -1; for (let i = 0; i < slots.length; i++) { const s = slots[i]; if (s && s.phase === "idle" && !s.pinned) { s.age += 1; if (s.age > maxAge) { maxAge = s.age; evictIdx = i; } } } if (evictIdx === -1 || queue.length === 0) return; // nothing eligible this tick startSwap(evictIdx); }; const start = () => { window.clearInterval(interval); interval = window.setInterval(tick, swapIntervalMs); }; const stop = () => window.clearInterval(interval); if (!mq.matches) start(); const onReducedChange = () => { if (mq.matches) stop(); else start(); }; mq.addEventListener("change", onReducedChange); return () => { stop(); mq.removeEventListener("change", onReducedChange); for (let i = 0; i < budget; i++) { window.clearTimeout(outTimers[i]); window.clearTimeout(inTimers[i]); const raf = rafs[i]; if (raf) cancelAnimationFrame(raf); } }; // eslint-disable-next-line react-hooks/exhaustive-deps }, [items, budget, swapIntervalMs]); const setPinned = (slotIdx: number, pinned: boolean) => { const slot = slotsRef.current[slotIdx]; if (!slot) return; slot.pinned = pinned; if (!pinned) slot.age = 0; const btn = buttonRefs.current[slotIdx]; if (btn) { if (pinned) btn.dataset.pinned = "true"; else delete btn.dataset.pinned; } }; const visibleCount = Math.min(budget, items.length); const total = items.length; return (

{Array.from({ length: budget }, (_, i) => { const item = items[i]; if (!item) return null; return ( ); })}

{visibleCount} of {total} shown, {total} total

{/* always in the DOM: the true, fully enumerable list — this is what the "+N more" pattern always guaranteed and this replaces */}

{item.label}

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