{"$schema":"https://ui.shadcn.com/schema/registry-item.json","name":"glass-lens","type":"registry:component","title":"Glass lens","description":"A ball of glass rides over the words and magnifies whatever it passes; press and the whole paragraph shivers and flushes indigo.","author":"Yash Bavadiya ","dependencies":["motion"],"registryDependencies":["utils"],"files":[{"path":"components/glass-lens.tsx","type":"registry:component","content":"\"use client\";\n\nimport { useEffect, useId, useLayoutEffect, useRef, useState } from \"react\";\nimport {\n animate,\n motion,\n useMotionTemplate,\n useMotionValue,\n useSpring,\n useTransform,\n type MotionValue,\n} from \"motion/react\";\nimport { usePreviewPlay } from \"@/lib/preview-play\";\nimport { useReducedMotion } from \"@/hooks/use-reduced-motion\";\nimport { cn } from \"@/lib/utils\";\n\n// After Gionatannese's GN.D portfolio (https://x.com/gionatannese): a ball of\n// glass and chrome that rides over the type and magnifies whatever is under\n// it. Press, and the whole paragraph shivers and flushes indigo for a\n// moment. Left alone, the lens drifts across the words by itself.\n\n// The lens's radius and how much it enlarges.\nconst R = 66;\nconst MAG = 1.75;\n// The lens trails the pointer a touch, like something with a little\n// weight.\nconst FOLLOW = { stiffness: 520, damping: 42, mass: 0.6 };\n\n// A press: up fast, then settling out slowly, like a struck surface.\nfunction strike(shiver: MotionValue, reduceMotion: boolean) {\n if (reduceMotion) {\n animate(shiver, [0, 0.4, 0], { duration: 0.6 });\n return;\n }\n animate(shiver, [0, 1, 0], {\n duration: 0.95,\n times: [0, 0.18, 1],\n ease: [\"easeOut\", [0.22, 1, 0.36, 1]],\n });\n}\n\nexport function GlassLens({\n text = \"Turning bold ideas into ambitious and meticulously crafted things that actually stick.\",\n className,\n}: {\n text?: string;\n className?: string;\n}) {\n const reduceMotion = useReducedMotion();\n const play = usePreviewPlay();\n const warpId = useId().replace(/:/g, \"\");\n const box = useRef(null);\n const turbulence = useRef(null);\n const displace = useRef(null);\n const [width, setWidth] = useState(0);\n const pointerIn = useRef(false);\n\n // Where the lens is headed, and where it is.\n const tx = useMotionValue(140);\n const ty = useMotionValue(70);\n const sx = useSpring(tx, FOLLOW);\n const sy = useSpring(ty, FOLLOW);\n const x = reduceMotion ? tx : sx;\n const y = reduceMotion ? ty : sy;\n\n // The magnified copy is the same paragraph, moved so the spot under the\n // lens sits in its middle, then enlarged about that spot.\n const left = useTransform(x, (v) => v - R);\n const top = useTransform(y, (v) => v - R);\n const innerX = useTransform(x, (v) => R - v);\n const innerY = useTransform(y, (v) => R - v);\n const origin = useMotionTemplate`${x}px ${y}px`;\n const shadowTop = useTransform(top, (v) => v + 16);\n\n // 0 at rest, 1 at the height of a press.\n const shiver = useMotionValue(0);\n const tint = useTransform(shiver, [0, 0.35, 1], [0, 1, 1]);\n\n useLayoutEffect(() => {\n const el = box.current;\n if (!el) return;\n const measure = () => setWidth(el.offsetWidth);\n measure();\n const ro = new ResizeObserver(measure);\n ro.observe(el);\n return () => ro.disconnect();\n }, []);\n\n // The shiver drives the warp filter directly, never React.\n useEffect(\n () =>\n shiver.on(\"change\", (v) => {\n displace.current?.setAttribute(\"scale\", String(v * 16));\n turbulence.current?.setAttribute(\"seed\", String(Math.round(v * 40)));\n }),\n [shiver],\n );\n\n // Drifts over the words while nobody is pointing at it: on a phone, in an\n // index card, or after the pointer leaves.\n useEffect(() => {\n const el = box.current;\n if (!el || reduceMotion || play === false) return;\n let frame = 0;\n let visible = false;\n const start = performance.now();\n const loop = (now: number) => {\n if (!pointerIn.current) {\n const t = (now - start) / 1000;\n const w = el.offsetWidth;\n const h = el.offsetHeight;\n // Swings across the words but stays over them, so on a narrow\n // phone it never hangs off the edge or magnifies the margin.\n // Balanced lines stop short of the edge, so it swings a little\n // less than the full width.\n const reachX = Math.max(0, w / 2 - R * 0.9) * 0.72;\n const reachY = Math.max(0, h / 2 - R * 0.7);\n tx.set(w / 2 + reachX * Math.sin(t * 0.42));\n ty.set(h / 2 + reachY * Math.sin(t * 0.67 + 1.2));\n }\n frame = visible ? requestAnimationFrame(loop) : 0;\n };\n const io = new IntersectionObserver(([entry]) => {\n visible = entry.isIntersecting;\n if (visible && !frame) frame = requestAnimationFrame(loop);\n });\n io.observe(el);\n return () => {\n cancelAnimationFrame(frame);\n io.disconnect();\n };\n }, [play, reduceMotion, tx, ty]);\n\n // The card's show: a press every few seconds.\n useEffect(() => {\n if (!play || reduceMotion) return;\n const timer = setInterval(() => strike(shiver, false), 2600);\n return () => clearInterval(timer);\n }, [play, reduceMotion, shiver]);\n\n const press = () => strike(shiver, reduceMotion);\n\n const local = (e: React.PointerEvent) => {\n const rect = e.currentTarget.getBoundingClientRect();\n // Layout size over drawn size, in case it's shown scaled.\n const k = e.currentTarget.clientWidth / rect.width;\n return { px: (e.clientX - rect.left) * k, py: (e.clientY - rect.top) * k };\n };\n\n const paragraph = (\n

\n {text}\n

\n );\n\n return (\n {\n if (play !== null) return;\n // A finger moves the lens only while it's down, so a scroll that\n // passes over still scrolls.\n if (e.pointerType === \"touch\" && e.buttons === 0) return;\n const { px, py } = local(e);\n pointerIn.current = true;\n tx.set(px);\n ty.set(py);\n }}\n onPointerDown={(e) => {\n if (play !== null) return;\n const { px, py } = local(e);\n pointerIn.current = true;\n tx.set(px);\n ty.set(py);\n press();\n }}\n onPointerLeave={() => {\n pointerIn.current = false;\n }}\n onPointerUp={(e) => {\n if (e.pointerType === \"touch\") pointerIn.current = false;\n }}\n >\n \n \n \n \n \n \n\n {/* The words, and an indigo copy laid over them that shows during a\n press, both warped together. */}\n
\n
{paragraph}
\n \n {paragraph}\n \n
\n\n {/* The lens. */}\n \n \n
{paragraph}
\n \n {paragraph}\n \n \n\n {/* The glass: darker towards the rim where it bends the most, a\n cool indigo reflection pooled at the bottom, a bright window\n caught at the top left, and a thin chrome edge. */}\n \n \n \n \n \n \n\n {/* Its shadow on the page, offset down as if lit from above. */}\n \n \n );\n}\n\nexport default function GlassLensDemo() {\n return ;\n}\n"},{"path":"lib/preview-play.ts","type":"registry:lib","target":"lib/preview-play.ts","content":"\"use client\";\n\nimport { createContext, useContext } from \"react\";\n\n// Lets a demo know whether it's showing in an index card, and whether that\n// card is hovered or focused. Demos use it to act themselves out on hover:\n// a star button stars itself, a checkbox scribbles, and so on.\n//\n// null: not in a preview (the component's own page, or real use).\n// false: in a preview, at rest.\n// true: in a preview, being hovered or focused: play the show.\nexport const PreviewPlayContext = createContext(null);\n\nexport function usePreviewPlay() {\n return useContext(PreviewPlayContext);\n}\n"},{"path":"hooks/use-reduced-motion.ts","type":"registry:hook","target":"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"}],"categories":["text"],"docs":"From ui lab: https://lab.xevrion.dev/lab/glass-lens"}