4e:I[314491,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/3j06ow7w40nxu.js","/_next/static/immutable/chunks/31nn7jwsjvqii.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"FilesView"] 4f:T5e3e,"use client"; import { useCallback, useEffect, useLayoutEffect, useRef, useState, type KeyboardEvent, type PointerEvent as ReactPointerEvent, type ReactNode, } from "react"; /* * Cover Flow – browse covers in 3D, in a single self-contained file. * The cover in front faces you; the others turn away and stack up on both sides, with a soft reflection * on the floor. Drag, flick, scrub with the trackpad, use the arrow keys or click a cover – a spring * carries the row along and settles on the nearest cover. The caption below rolls to the new title. * Everything moves on the GPU (transforms only) and React re-renders only when the front cover changes. * The styles are injected below, so no extra files are needed. */ export type CoverFlowItem = { id: string | number; title?: string; subtitle?: string; /** Image URL – or pass your own cover with `cover` */ image?: string; alt?: string; /** Any content instead of an image: artwork, a video, a product card */ cover?: ReactNode; }; export type CoverFlowProps = { items: CoverFlowItem[]; /** Controlled front cover */ index?: number; /** Starting cover when uncontrolled – defaults to the middle one */ defaultIndex?: number; onIndexChange?: (index: number) => void; /** Clicking (or pressing Enter on) the cover in front */ onSelect?: (item: CoverFlowItem, index: number) => void; /** Cover size in px – scales down on narrow containers */ itemWidth?: number; itemHeight?: number; /** How far the side covers turn away, in degrees */ angle?: number; /** Mirror the covers on the floor */ reflection?: boolean; /** Title and subtitle of the front cover */ caption?: boolean; /** Replaces the default caption (title and subtitle) */ renderCaption?: (item: CoverFlowItem, index: number) => ReactNode; /** Previous / next buttons next to the caption */ controls?: boolean; /** A row of small position ticks under the caption */ ticks?: boolean; /** A soft click each time a new cover reaches the front */ sound?: boolean; "aria-label"?: string; className?: string; }; const VISIBLE = 7; // covers drawn on each side const DRAG_PX = 110; // drag distance per cover, before scaling export function CoverFlow({ items, index, defaultIndex, onIndexChange, onSelect, itemWidth = 280, itemHeight = 280, angle = 50, reflection = true, caption = true, renderCaption, controls = true, ticks = true, sound = false, "aria-label": ariaLabel = "Cover flow", className, }: CoverFlowProps) { const count = items.length; const last = Math.max(count - 1, 0); const clamp = (v: number) => Math.min(Math.max(v, 0), last); const start = clamp(index ?? defaultIndex ?? Math.floor(last / 2)); const [active, setActive] = useState(start); const [dir, setDir] = useState(1); // direction of travel, for the caption const [scale, setScale] = useState(1); const root = useRef(null); const cards = useRef<(HTMLDivElement | null)[]>([]); // Motion state lives outside React: pos follows target on a spring, painted every frame const m = useRef({ pos: start, target: start, vel: 0, raf: 0, last: 0, active: start }); const opts = useRef({ angle, scale, itemWidth, onIndexChange, sound, count }); opts.current = { angle, scale, itemWidth, onIndexChange, sound, count }; const reduced = useRef(false); useEffect(() => { const q = window.matchMedia("(prefers-reduced-motion: reduce)"); reduced.current = q.matches; const on = () => (reduced.current = q.matches); q.addEventListener("change", on); return () => q.removeEventListener("change", on); }, []); // A short, soft tick – made with Web Audio, no sound file const audio = useRef(null); const tick = () => { const ctx = audio.current; if (!ctx || ctx.state !== "running") return; const t = ctx.currentTime; const osc = ctx.createOscillator(); const gain = ctx.createGain(); osc.type = "triangle"; osc.frequency.setValueAtTime(2200, t); osc.frequency.exponentialRampToValueAtTime(900, t + 0.03); gain.gain.setValueAtTime(0.0001, t); gain.gain.exponentialRampToValueAtTime(0.05, t + 0.004); gain.gain.exponentialRampToValueAtTime(0.0001, t + 0.045); osc.connect(gain).connect(ctx.destination); osc.start(t); osc.stop(t + 0.05); }; const wakeAudio = () => { if (!opts.current.sound) return; const Ctx = window.AudioContext ?? (window as unknown as { webkitAudioContext?: typeof AudioContext }).webkitAudioContext; if (!audio.current && Ctx) audio.current = new Ctx(); if (audio.current?.state === "suspended") void audio.current.resume(); }; useEffect(() => () => void audio.current?.close(), []); // Place every cover for the current (fractional) position const paint = useCallback(() => { const { pos } = m.current; const { angle: a, scale: s, itemWidth: w } = opts.current; const gap = w * 0.78 * s; // center cover to the first side cover const step = w * 0.27 * s; // between side covers const depth = w * 0.7 * s; cards.current.forEach((el, i) => { if (!el) return; const d = i - pos; const ad = Math.abs(d); if (ad > VISIBLE + 1) { el.style.visibility = "hidden"; return; } const t = Math.min(ad, 1); // 0 in front, 1 once fully turned const dir = Math.sign(d); const x = dir * (t * gap + Math.max(ad - 1, 0) * step); el.style.visibility = ""; const k = 1 - t * 0.08 - Math.min(Math.max(ad - 1, 0), 4) * 0.015; // recede a little more with distance el.style.transform = `translate3d(${x}px, 0, ${-t * depth}px) rotateY(${-dir * t * a}deg) scale(${k.toFixed(4)})`; el.style.zIndex = String(1000 - Math.round(ad * 10)); el.style.setProperty("--ui-cf-t", t.toFixed(3)); el.style.setProperty("--ui-cf-d", Math.min(Math.max(d, -1.5), 1.5).toFixed(3)); // drives the image drift el.dataset.side = d < 0 ? "left" : "right"; }); const now = Math.round(Math.min(Math.max(pos, 0), opts.current.count - 1)); if (now !== m.current.active) { setDir(now > m.current.active ? 1 : -1); m.current.active = now; setActive(now); opts.current.onIndexChange?.(now); tick(); } }, []); // Spring toward the target; stops itself once settled const run = useCallback(() => { const s = m.current; if (s.raf) return; s.last = performance.now(); const frame = (now: number) => { const dt = Math.min(now - s.last, 32) / 1000; s.last = now; const k = 190; const c = 2 * Math.sqrt(k) * 0.92; // a hair under critical: settles with the faintest give s.vel += (k * (s.target - s.pos) - c * s.vel) * dt; s.pos += s.vel * dt; if (Math.abs(s.target - s.pos) < 0.0006 && Math.abs(s.vel) < 0.002) { s.pos = s.target; s.vel = 0; s.raf = 0; paint(); return; } paint(); s.raf = requestAnimationFrame(frame); }; s.raf = requestAnimationFrame(frame); }, [paint]); const goTo = useCallback( (i: number) => { const s = m.current; s.target = Math.min(Math.max(Math.round(i), 0), opts.current.count - 1); if (reduced.current) { s.pos = s.target; s.vel = 0; paint(); } else run(); }, [paint, run], ); useEffect(() => () => cancelAnimationFrame(m.current.raf), []); // Controlled index useEffect(() => { if (index !== undefined && index !== Math.round(m.current.target)) goTo(index); }, [index, goTo]); // Keep the position valid when items are added or removed useEffect(() => { if (m.current.target > last) goTo(last); else paint(); }, [last, goTo, paint]); // Scale covers down when the container is narrow useLayoutEffect(() => { const el = root.current; if (!el) return; const fit = () => setScale(Math.min(1, Math.max(0.5, el.clientWidth / (itemWidth * 3.2)))); fit(); const ro = new ResizeObserver(fit); ro.observe(el); return () => ro.disconnect(); }, [itemWidth]); // After every render: items may have been reordered or resized (cheap – React renders only on a new front cover) useLayoutEffect(paint); // Trackpad / horizontal wheel scrubs; vertical scrolling stays with the page const snapTimer = useRef(0); useEffect(() => { const el = root.current; if (!el) return; const onWheel = (e: WheelEvent) => { const dx = e.shiftKey && !e.deltaX ? e.deltaY : e.deltaX; if (Math.abs(dx) <= Math.abs(e.deltaY) && !e.shiftKey) return; e.preventDefault(); wakeAudio(); const s = m.current; const unit = DRAG_PX * opts.current.scale * 1.4; s.target = Math.min(Math.max(s.target + dx / unit, -0.35), opts.current.count - 1 + 0.35); run(); window.clearTimeout(snapTimer.current); // Settle with the swipe's momentum: lean toward the direction it was going snapTimer.current = window.setTimeout(() => goTo(s.target + Math.sign(dx) * 0.3), 110); }; el.addEventListener("wheel", onWheel, { passive: false }); return () => { el.removeEventListener("wheel", onWheel); window.clearTimeout(snapTimer.current); }; }, [run, goTo]); // Drag and flick: the row follows the finger 1:1, a flick carries on, then it settles on a cover const drag = useRef<{ id: number; x: number; from: number; moved: boolean; hit: number | null; samples: { x: number; t: number }[] } | null>(null); const onPointerDown = (e: ReactPointerEvent) => { if (e.button !== 0) return; wakeAudio(); const hit = (e.target as HTMLElement).closest("[data-cf-index]"); drag.current = { id: e.pointerId, x: e.clientX, from: m.current.pos, moved: false, hit: hit ? Number(hit.dataset.cfIndex) : null, samples: [{ x: e.clientX, t: performance.now() }], }; }; const onPointerMove = (e: ReactPointerEvent) => { const d = drag.current; if (!d || d.id !== e.pointerId) return; const dx = e.clientX - d.x; if (!d.moved) { if (Math.abs(dx) < 6) return; d.moved = true; e.currentTarget.setPointerCapture(e.pointerId); e.currentTarget.dataset.dragging = ""; } const s = m.current; cancelAnimationFrame(s.raf); s.raf = 0; let p = d.from - dx / (DRAG_PX * opts.current.scale); const max = opts.current.count - 1; if (p < 0) p = p * 0.3; // rubber band past the ends if (p > max) p = max + (p - max) * 0.3; s.pos = s.target = p; s.vel = 0; d.samples.push({ x: e.clientX, t: performance.now() }); if (d.samples.length > 6) d.samples.shift(); paint(); }; const onPointerUp = (e: ReactPointerEvent) => { const d = drag.current; if (!d || d.id !== e.pointerId) return; drag.current = null; delete e.currentTarget.dataset.dragging; if (!d.moved) { // A click: bring that cover to the front, or select it if it is already there if (d.hit === null) return; if (d.hit === Math.round(m.current.target)) onSelect?.(items[d.hit], d.hit); else goTo(d.hit); return; } const first = d.samples[0]; const lastS = d.samples[d.samples.length - 1]; const dt = Math.max(lastS.t - first.t, 1); const v = -((lastS.x - first.x) / dt) * 1000 / (DRAG_PX * opts.current.scale); // covers per second const s = m.current; s.vel = reduced.current ? 0 : v; let to = Math.round(s.pos + v * 0.18); // A quick flick always moves at least one cover if (Math.abs(v) > 0.8 && to === Math.round(d.from)) to += Math.sign(v); goTo(to); }; const onKeyDown = (e: KeyboardEvent) => { const cur = Math.round(m.current.target); const keys: Record = { ArrowLeft: cur - 1, ArrowRight: cur + 1, Home: 0, End: last }; if (e.key in keys) { e.preventDefault(); wakeAudio(); goTo(keys[e.key]); } else if ((e.key === "Enter" || e.key === " ") && onSelect && e.target === e.currentTarget) { e.preventDefault(); onSelect(items[cur], cur); } }; const current = items[active]; const w = Math.round(itemWidth * scale); const h = Math.round(itemHeight * scale); const face = (item: CoverFlowItem, decorative = false) => (

{item.cover ?? (item.image ? ( {decorative

) : null)}

); return (

{/* React 19 hoists this into once, no matter how many cover flows render */}

{items.map((item, i) => (

{ cards.current[i] = el; }} className="ui-cf__item" data-cf-index={i} data-active={i === active || undefined} role="group" aria-roledescription="slide" aria-label={`${i + 1} of ${count}${item.title ? `: ${item.title}` : ""}`} aria-hidden={i !== active || undefined} > ))}

{(caption || controls || ticks) && (

{controls && ( )} {caption && (

0 ? "next" : "prev"}> {current && (renderCaption ? ( renderCaption(current, active) ) : ( <> {current.title &&

{current.title}

} {current.subtitle &&

{current.subtitle}

} ))}

)} {controls && ( )}

{ticks && count > 1 && (

{items.map((item, i) => (

)}

); } const css = /* css */ ` .ui-cf { --ui-cf-ink: #171717; --ui-cf-muted: #8a8a8a; --ui-cf-card: #f1f1f1; --ui-cf-edge: rgba(0, 0, 0, 0.08); --ui-cf-dim: rgba(255, 255, 255, 0.24); --ui-cf-shadow: 0 1px 2px rgba(0, 0, 0, 0.05), 0 10px 20px -12px rgba(0, 0, 0, 0.18); --ui-cf-reflect: 0.22; --ui-cf-ground: rgba(0, 0, 0, 0.16); --ui-cf-tick: rgba(0, 0, 0, 0.16); --ui-cf-nav: #ffffff; --ui-cf-nav-line: #e7e7e7; --ui-cf-focus: rgba(23, 23, 23, 0.25); --ui-cf-ease: cubic-bezier(0.22, 1, 0.36, 1); display: grid; gap: 4px; width: 100%; min-width: 0; font-family: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; -webkit-font-smoothing: antialiased; } /* Soft fade on both sides, so the stacks run out instead of being cut off */ .ui-cf__viewport { position: relative; overflow: hidden; padding: calc(var(--ui-cf-h) * 0.08) 0 0; height: calc(var(--ui-cf-h) * 1.08); border-radius: 12px; outline: none; cursor: grab; touch-action: pan-y; user-select: none; -webkit-user-select: none; -webkit-mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent); mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent); } .ui-cf[data-reflection] .ui-cf__viewport { height: calc(var(--ui-cf-h) * 1.4); } .ui-cf__viewport[data-dragging] { cursor: grabbing; } .ui-cf__viewport:focus-visible .ui-cf__item[data-active] .ui-cf__card { box-shadow: var(--ui-cf-shadow), 0 0 0 3px var(--ui-cf-focus); } .ui-cf__stage { position: relative; height: var(--ui-cf-h); transform-style: preserve-3d; } .ui-cf__item { position: absolute; top: 0; left: 50%; width: var(--ui-cf-w); height: var(--ui-cf-h); margin-left: calc(var(--ui-cf-w) / -2); transform-style: preserve-3d; will-change: transform; } .ui-cf__viewport[data-selectable] .ui-cf__item[data-active] { cursor: pointer; } .ui-cf__card { position: relative; width: 100%; height: 100%; overflow: hidden; border-radius: 12px; background: var(--ui-cf-card); box-shadow: var(--ui-cf-shadow); } .ui-cf__media { position: absolute; inset: 0 -8%; transform: translateX(calc(var(--ui-cf-d, 0) * -5%)); } .ui-cf__media > img { display: block; width: 100%; height: 100%; object-fit: cover; pointer-events: none; } /* A soft shadow on the floor that fades as a cover turns away */ .ui-cf__ground { position: absolute; left: 10%; right: 10%; bottom: -3px; height: 8px; border-radius: 50%; background: var(--ui-cf-ground); filter: blur(5px); opacity: calc(1 - var(--ui-cf-t, 0) * 0.7); pointer-events: none; } /* Hairline edge, a dim that grows as a cover turns away, and a sheen on the side facing the light */ .ui-cf__card::before, .ui-cf__card::after { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; } .ui-cf__card::before { z-index: 2; box-shadow: inset 0 0 0 1px var(--ui-cf-edge); background: linear-gradient(90deg, rgba(255, 255, 255, 0.22), transparent 45%); opacity: calc(var(--ui-cf-t, 0) * 0.9); } .ui-cf__item[data-side="right"] .ui-cf__card::before { background: linear-gradient(270deg, rgba(255, 255, 255, 0.22), transparent 45%); } .ui-cf__card::after { z-index: 1; background: var(--ui-cf-dim); opacity: var(--ui-cf-t, 0); } /* The floor: a flipped copy that fades out – a mask, so it works on any background */ .ui-cf__reflection { position: absolute; top: 100%; left: 0; width: 100%; height: 32%; margin-top: 2px; overflow: hidden; pointer-events: none; -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, var(--ui-cf-reflect)), transparent 85%); mask-image: linear-gradient(to bottom, rgba(0, 0, 0, var(--ui-cf-reflect)), transparent 85%); } .ui-cf__reflection > .ui-cf__card { height: var(--ui-cf-h); transform: scaleY(-1); transform-origin: 50% calc(var(--ui-cf-h) / 2); box-shadow: none; } .ui-cf__reflection > .ui-cf__card { position: absolute; bottom: auto; top: 0; } /* Caption with previous / next on either side, position ticks below */ .ui-cf__footer { position: relative; z-index: 1; display: grid; justify-items: center; gap: 14px; margin-top: calc(var(--ui-cf-h) * -0.04); } .ui-cf:not([data-reflection]) .ui-cf__footer { margin-top: 12px; } .ui-cf__row { display: flex; align-items: center; justify-content: center; gap: 20px; min-height: 44px; } .ui-cf__ticks { display: flex; align-items: center; gap: 2px; } .ui-cf__tick { display: grid; place-items: center; width: 14px; height: 14px; padding: 0; border: 0; background: none; cursor: pointer; } .ui-cf__tick::before { content: ""; width: 5px; height: 5px; border-radius: 999px; background: var(--ui-cf-tick); transition: width 320ms var(--ui-cf-ease), background-color 200ms ease; } .ui-cf__tick[aria-current]::before { width: 14px; background: var(--ui-cf-ink); } .ui-cf__tick:hover::before { background: var(--ui-cf-muted); } .ui-cf__tick[aria-current]:hover::before { background: var(--ui-cf-ink); } .ui-cf__caption { display: grid; min-width: min(220px, 50vw); text-align: center; } .ui-cf__caption-in { animation: ui-cf-in 420ms var(--ui-cf-ease) both; } .ui-cf__caption-in[data-dir="prev"] { animation-name: ui-cf-in-prev; } .ui-cf__title { color: var(--ui-cf-ink); font-size: 15px; font-weight: 600; letter-spacing: -0.01em; line-height: 1.35; } .ui-cf__subtitle { color: var(--ui-cf-muted); font-size: 13px; line-height: 1.4; } .ui-cf__nav { display: grid; place-items: center; flex: none; width: 32px; height: 32px; padding: 0; border: 0; border-radius: 999px; background: var(--ui-cf-nav); box-shadow: inset 0 0 0 1px var(--ui-cf-nav-line), 0 1px 2px rgba(0, 0, 0, 0.05); color: var(--ui-cf-ink); cursor: pointer; transition: transform 160ms var(--ui-cf-ease), opacity 160ms ease; } .ui-cf__nav:active { transform: scale(0.92); } .ui-cf__nav:disabled { opacity: 0.35; cursor: default; transform: none; } .ui-cf__nav:focus-visible { outline: 2px solid var(--ui-cf-focus); outline-offset: 2px; } .ui-cf__nav svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; } @media (pointer: coarse) { .ui-cf__nav { width: 40px; height: 40px; } } /* The caption rises in from the direction of travel */ @keyframes ui-cf-in { from { opacity: 0; transform: translate(14px, 4px); filter: blur(3px); } to { opacity: 1; transform: none; filter: none; } } @keyframes ui-cf-in-prev { from { opacity: 0; transform: translate(-14px, 4px); filter: blur(3px); } to { opacity: 1; transform: none; filter: none; } } @media (prefers-reduced-motion: reduce) { .ui-cf__caption-in { animation: none; } .ui-cf__media { transform: none; } .ui-cf__tick::before { transition: none; } .ui-cf__nav { transition: none; } } /* Dark mode: follows a .dark class or data-theme="dark" on any ancestor, e.g. */ :where(.dark, [data-theme="dark"]) .ui-cf { --ui-cf-ink: #ededed; --ui-cf-muted: #8f8f8f; --ui-cf-card: #1d1d20; --ui-cf-edge: rgba(255, 255, 255, 0.1); --ui-cf-dim: rgba(0, 0, 0, 0.5); --ui-cf-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 24px -14px rgba(0, 0, 0, 0.6); --ui-cf-reflect: 0.3; --ui-cf-ground: rgba(0, 0, 0, 0.45); --ui-cf-tick: rgba(255, 255, 255, 0.2); --ui-cf-nav: #1d1d20; --ui-cf-nav-line: rgba(255, 255, 255, 0.1); --ui-cf-focus: rgba(255, 255, 255, 0.35); } `; 4d:["$","div",null,{"className":"mt-3 flex min-h-0 min-w-0 flex-1 flex-col gap-3","children":[null,["$","$L4e",null,{"files":[{"path":"illustrations/cover-flow/cover-flow.tsx","content":"$4f","type":"registry:block"}],"className":"h-[70svh] min-h-80"}]]}]