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Everywhere else the text is simply readable. Linear, because // the scroll position is already the clock. const CSS = ` @supports (animation-timeline: scroll()) { @media (prefers-reduced-motion: no-preference) { .scroll-reveal { scroll-timeline: --scroll-reveal y; } .scroll-reveal-word { animation: scroll-reveal-word linear both; animation-timeline: --scroll-reveal; animation-range: var(--start) var(--end); } } } @keyframes scroll-reveal-word { from { color: var(--muted-foreground); opacity: 0.5; filter: blur(2px); } to { color: var(--foreground); opacity: 1; filter: blur(0); } } `; export function ScrollReveal({ text, label, className, }: { text: string; label: string; className?: string; }) { const words = text.split(/\s+/).filter(Boolean); const last = Math.max(words.length - 1, 1); const reduceMotion = useReducedMotion(); const scrollerRef = useRef(null); const trackRef = useRef(null); const thumbRef = useRef(null); const drag = useRef<{ startY: number; startScroll: number }>(null); // Written straight to the thumb on every scroll, so it tracks without // re-rendering React. const sync = useCallback(() => { const scroller = scrollerRef.current; const track = trackRef.current; const thumb = thumbRef.current; if (!scroller || !track || !thumb) return; const height = Math.max( (scroller.clientHeight / scroller.scrollHeight) * track.clientHeight, MIN_THUMB, ); const max = scroller.scrollHeight - scroller.clientHeight; const progress = max > 0 ? scroller.scrollTop / max : 0; thumb.style.height = `${height}px`; thumb.style.transform = `translateY(${progress * (track.clientHeight - height)}px)`; }, []); useEffect(() => { const scroller = scrollerRef.current; if (!scroller) return; sync(); const observer = new ResizeObserver(sync); observer.observe(scroller); return () => observer.disconnect(); }, [sync]); // How many px of scroll one px of thumb travel is worth. const ratio = () => { const scroller = scrollerRef.current!; const track = trackRef.current!; const thumb = thumbRef.current!; return ( (scroller.scrollHeight - scroller.clientHeight) / Math.max(track.clientHeight - thumb.offsetHeight, 1) ); }; return ( // The surface and focus ring live on the wrapper so the edge mask below // fades only the text, not the box or its outline.

{/* 44px fades hint that the text continues past each edge. */}

{/* The padding adds up to the box height (136 + 224 = 360), so the reveal edge holds still about 40% down while the text moves through it, from the first line to the last. */}

{words.map((word, i) => { const start = (i / last) * (1 - WINDOW); return ( {word} {" "} ); })}

{/* Outside the scroller, so the edge mask never fades it. The native bar is hidden; this one can be dragged to scrub through the reveal. */}

{ const scroller = scrollerRef.current; const thumb = thumbRef.current; if (!scroller || !thumb || e.button !== 0) return; if (e.target === thumb) { drag.current = { startY: e.clientY, startScroll: scroller.scrollTop }; e.currentTarget.setPointerCapture(e.pointerId); return; } // A click on the rail glides there, centring the thumb on the click. const box = e.currentTarget.getBoundingClientRect(); const offset = e.clientY - box.top - thumb.offsetHeight / 2; scroller.scrollTo({ top: offset * ratio(), behavior: reduceMotion ? "auto" : "smooth", }); }} onPointerMove={(e) => { const scroller = scrollerRef.current; if (!drag.current || !scroller) return; scroller.scrollTop = drag.current.startScroll + (e.clientY - drag.current.startY) * ratio(); }} onPointerUp={() => { drag.current = null; }} onPointerCancel={() => { drag.current = null; }} >

); } export default function ScrollRevealDemo() { return ( ); } 5f:["$","div",null,{"className":"mt-3 flex min-h-0 min-w-0 flex-1 flex-col gap-3","children":[["$","div",null,{"className":"flex shrink-0 items-start gap-3","children":[["$","div",null,{"className":"flex max-h-28 min-w-0 flex-1 flex-wrap items-center gap-2 overflow-y-auto","children":[null,["$","$L60",null,{"namespace":"@xevrion","registryDependencies":["utils"]}]]}],["$","$L61",null,{"children":["$","div",null,{"className":"@container","children":["$","div",null,{"className":"grid grid-cols-1 gap-4 @xl:grid-cols-2","children":[["$","div",null,{"className":"flex flex-col border rounded-md","children":[["$","p",null,{"className":"text-sm font-medium border-b p-2","children":"Light Mode"}],["$","div",null,{"children":["$","$L62",null,{"type":"always","className":"h-80 px-2","children":[["$","div",null,{"className":"gap-2 pb-8 flex flex-col pt-4","children":[["$","div","shadow-raised",{"className":"items-start gap-1 grid grid-cols-2 text-sm","children":[["$","div",null,{"className":"hover:bg-muted/50 py-2","children":["$","p",null,{"className":"text-foreground/80 text-sm","children":["--","shadow-raised",":"]}]}],["$","div",null,{"className":"hover:bg-muted/50 py-2 px-1 rounded-md w-full","children":"0 0 0 1px oklch(0 0 0 / 0.06), 0 1px 2px oklch(0 0 0 / 0.06), 0 6px 16px -6px oklch(0 0 0 / 0.12)"}]]}]]}],["$","$L63",null,{"orientation":"horizontal"}]]}]}]]}],["$","div",null,{"className":"flex flex-col border rounded-md","children":[["$","p",null,{"className":"text-sm font-medium border-b p-2","children":"Dark Mode"}],["$","div",null,{"children":["$","$L62",null,{"type":"always","className":"h-80 px-2","children":[["$","div",null,{"className":"gap-2 pb-8 flex flex-col pt-4","children":[["$","div","shadow-raised",{"className":"items-start gap-1 grid grid-cols-2 text-sm","children":[["$","div",null,{"className":"hover:bg-muted/50 py-2","children":["$","p",null,{"className":"text-foreground/80 text-sm","children":["--","shadow-raised",":"]}]}],["$","div",null,{"className":"hover:bg-muted/50 py-2 px-1 rounded-md w-full","children":"0 0 0 1px oklch(1 0 0 / 0.08), 0 1px 2px oklch(0 0 0 / 0.4), 0 6px 16px -6px oklch(0 0 0 / 0.6)"}]]}]]}],["$","$L63",null,{"orientation":"horizontal"}]]}]}]]}],["$","div",null,{"className":"flex flex-col border rounded-md","children":[["$","p",null,{"className":"text-sm font-medium border-b p-2","children":"Theme"}],["$","div",null,{"children":["$","$L62",null,{"type":"always","className":"h-80 px-2","children":[["$","div",null,{"className":"gap-2 pb-8 flex flex-col pt-4","children":[["$","div","shadow-raised",{"className":"items-start gap-1 grid grid-cols-2 text-sm","children":[["$","div",null,{"className":"hover:bg-muted/50 py-2","children":["$","p",null,{"className":"text-foreground/80 text-sm","children":["--","shadow-raised",":"]}]}],["$","div",null,{"className":"hover:bg-muted/50 py-2 px-1 rounded-md w-full","children":"var(--shadow-raised)"}]]}]]}],["$","$L63",null,{"orientation":"horizontal"}]]}]}]]}],null]}]}]}]]}],["$","$L64",null,{"files":[{"path":"components/scroll-reveal.tsx","content":"$65","type":"registry:component"},{"path":"hooks/use-reduced-motion.ts","content":"\"use client\";\n\nimport { useSyncExternalStore } from \"react\";\n\n// Motion's useReducedMotion reads the media query on the very first client\n// render, but the server can't know it, so every component that renders\n// differently under reduced motion broke hydration for those users. This\n// reports false during hydration, matching the server HTML, then the real\n// preference straight after, and follows it if it changes.\nconst query = \"(prefers-reduced-motion: reduce)\";\n\nfunction subscribe(onChange: () => void) {\n const media = window.matchMedia(query);\n media.addEventListener(\"change\", onChange);\n return () => media.removeEventListener(\"change\", onChange);\n}\n\nexport function useReducedMotion() {\n return useSyncExternalStore(\n subscribe,\n () => window.matchMedia(query).matches,\n () => false,\n );\n}\n","type":"registry:hook","target":"hooks/use-reduced-motion.ts"}],"className":"h-[70svh] min-h-80"}]]}]