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\n \"underlying\"\n

\n\n

\n Scroll-driven animation, physics-first. Scroll is a source, not an engine -\n
locked or momentum scrub, parallax, scroll-velocity, pin, snap, and triggers, on the one rAF loop.\n

\n\n

\n \"docs\"\n \"scroll\n \"built\n \"license\"\n

\n\n> Part of [underlying](https://github.com/underlyingjs/underlying), a physics-first motion library with first-class framework adapters (Angular first).\n\n## Why\n\n- **Scroll as a source, not an engine.** This package owns the three browser concerns `@underlying/core` refuses - one `IntersectionObserver`, one passive scroll/resize listener, and `getBoundingClientRect` - turns scroll into a normalized `0..1`, and fans it onto the core's existing seams. No physics is re-implemented.\n- **Locked or momentum, one field.** `smooth: false` locks the playhead to the scroll frame-for-frame (reversible, deterministic). A number routes through `follow()`, so the motion lags the scroll by that many seconds with conserved velocity.\n- **Composed, not bolted on.** Scrub drives the seekable `PlaybackHandle.progress()`; parallax returns a `bindStyle`-ready `Animatable`; everything runs on the same scheduler tick as the rest of your motion.\n- **Accessible by default.** One reduced-motion policy: momentum scrub collapses to locked, parallax is disabled, momentum snap goes instant - re-routed live when the OS preference changes.\n- **SSR-safe and lazy.** Nothing touches browser globals at import; the source is created on the first `track()`/builder call. Never scroll-jacking.\n\n## Install\n\n```sh\nnpm install @underlying/scroll\n```\n\n`@underlying/core` comes with it as a dependency; scroll shares its one rAF loop and value model.\n\n## Quick start\n\n```ts\nimport { createScroll } from '@underlying/scroll'\nimport { animatable, bindStyle, linear } from '@underlying/core'\nimport { playable } from '@underlying/core/playback'\n\nconst scroll = createScroll() // viewport, y-axis, shared scheduler\n\n// Locked scrub: scroll position drives a seekable handle, frame-for-frame.\n// A linear tween maps the scroll straight to progress (no ease-in on top).\nconst x = animatable(0)\nbindStyle(panel, { x })\nconst clip = playable(x).to(600, { paused: true, easing: linear })\nscroll.scrub(clip, { target: panel }) // smooth: false (default)\n```\n\n## Smooth scroll - inertia takes over the page\n\nPass `{ smooth: true }` and a spring takes over the scroll: wheel, touch (opt-in) and keys re-aim it and it glides to rest instead of stopping dead. It drives **native** scroll - no transform, no wrapper - so the scrollbar, in-page anchors, `position: sticky` and find-in-page keep working, and every other effect here (scrub, parallax, velocity, pin, snap, `scrollTo`) reads the smoothed position with no extra wiring.\n\n```ts\nconst scroll = createScroll({ smooth: { smooth: 0.12 } }) // catch-up time constant, seconds\n\nconst lean = scroll.velocity({ map: v => Math.max(-10, Math.min(10, v * 0.03)) })\nbindStyle(card, { skewY: lean }) // leans with the smoothed speed, for free\nscroll.scrollTo(section) // springs through the engine's one shared spring\n```\n\nOptions (`createScroll({ smooth })` or `controller.smooth()`): `smooth` (catch-up seconds, default 0.1, the same `stiffnessFor` mapping scrub/parallax use), `spring`, `wheelMultiplier` (1), `touchMultiplier` (2), `keyboard` (default on - Space/PageUp-Down/Home/End/Arrows, never stealing a form field), `touch` (default **off** - intercepting touchmove kills iOS native momentum and pull-to-refresh, so native touch is the honest default). The engine is lazy and one-per-controller; `controller.smooth()` returns a handle (`enabled()`, `target()`, `velocity()`, `setTarget()`). A user scroll the engine did not drive (scrollbar, anchor, keyboard) is adopted, not fought. **Off under reduced motion** - native scroll runs raw.\n\n## Scrub - locked or momentum\n\n```ts\n// Momentum: the handle trails the scroll by ~0.2s, velocity conserved.\nscroll.scrub(clip, { target: panel, smooth: 0.2 })\n\n// A live spring is seekable only after bake(); scrub does it once at link time.\nconst spring = playable(y).spring(800, { paused: true })\nscroll.scrub(spring, { target: hero, smooth: 0.3 })\n\n// A raw callback is always locked (nothing to seek).\nscroll.scrub((p) => { label.textContent = `${(p * 100) | 0}%` })\n```\n\n## Parallax\n\n```ts\n// Returns an Animatable - hand it straight to bindStyle.\nconst bgY = scroll.parallax({ target: section, output: [-120, 120] })\nbindStyle(bg, { y: bgY })\n\nconst lead = scroll.parallax({ target: section, output: [60, -60], smooth: 0.15 })\nbindStyle(foreground, { y: lead })\n```\n\n## Velocity - lean with scroll speed\n\n`velocity()` exposes how fast the scroller is moving as one `bindStyle`-ready value (px/s, signed), smoothed through a spring so it ramps and eases back to rest the moment you stop. Map it to a few degrees of skew, a scale, or a blur for the speed-reactive lean.\n\n```ts\n// raw signed px/s -> a few degrees, clamped; relaxes to 0 when scrolling stops\nconst skew = scroll.velocity({ map: (v) => Math.max(-8, Math.min(8, v * 0.02)) })\nbindStyle(content, { skewY: skew })\n```\n\nPhysics-first: a spring owns the relax, so a fresh flick mid-relax re-aims it with velocity conserved, never a restart. `smooth` (seconds) tunes the ramp/relax; `spring` overrides the follow config. Disabled under reduced motion (held at `map(0)`).\n\n## Marquee - a seamless looping ticker\n\n`marquee()` is a standalone helper (no controller needed). It clones a track's children just enough to fill the container, drifts the strip at a constant speed, and wraps at exactly one content period so there's no seam. Hand it `scroll.velocity()` and it speeds up and reverses with the scroll - the agency ticker.\n\n```ts\nimport { createScroll, marquee } from '@underlying/scroll'\n\nconst scroll = createScroll()\nmarquee(track, {\n speed: 60, // base drift, px/s\n velocity: scroll.velocity(), // + the live scroll speed -> reacts to scrolling\n pauseOnHover: true,\n})\n```\n\nThe container needs `overflow: hidden`; the `track` (its child holding the items) is what scrolls. Options: `speed`, `direction` (1 / -1), `axis` (`'x'` / `'y'`), `velocity` (a signed-px/s `Animatable` to add), `velocityFactor`, `pauseOnHover` (eases the drift to a stop via a spring), `spring`. The loop sleeps while the container is off-screen (IntersectionObserver) and sits still under reduced motion. Clones are `aria-hidden` + `inert`; `dispose()` removes them and restores the element.\n\n## Pin\n\n```ts\n// Wrap in a spacer, position:fixed across the range. pin.track is the progress\n// THROUGH the pinned span - feed it to a nested scrub.\nconst pin = scroll.pin(panel, { range: ['start start', 'bottom bottom'] })\n\nconst cap = animatable(0)\nbindStyle(caption, { opacity: cap })\nscroll.scrub(playable(cap).to(1, { paused: true, easing: linear }), { track: pin.track })\n```\n\n## Triggers\n\n```ts\nimport { playable } from '@underlying/core/playback'\n\n// Enter/leave via IntersectionObserver; direction read from the entry geometry.\nscroll.trigger(card, {\n onEnter: () => card.classList.add('in'),\n onLeaveBack: () => card.classList.remove('in'),\n})\n\n// Or drive a PlaybackHandle with toggleActions verbs\n// [onEnter, onLeave, onEnterBack, onLeaveBack].\nscroll.trigger(card, { toggle: clip, toggleActions: ['play', 'pause', 'resume', 'reverse'] })\n```\n\n## scrollTo - spring the scroller to a target\n\n```ts\n// Spring the scroller to an absolute px position or an element brought into\n// view. Returns a ScrollToHandle - { finished, cancel() }.\nconst handle = scroll.scrollTo(section, { offset: -80 }) // land 80px below the top\nawait handle.finished // resolves on arrival\n\n// align picks which ' ' pair to bring together.\n// Default 'start start' - the section's top lands at the viewport top.\nscroll.scrollTo(section, { align: 'center center', offset: -44 })\n\n// One follow() is shared across calls, so a scrollTo issued mid-flight RE-AIMS\n// the spring already in motion - velocity conserved, no restart jolt. Pass your\n// own spring, or immediate for a hard jump (always on under reduced motion).\nscroll.scrollTo(1200, { spring: { stiffness: 120 } })\nscroll.scrollTo(0, { immediate: true })\n\nhandle.cancel() // freeze the scroller where it is; finished resolves\n```\n\n`scrollTo()` never aims past the reachable range, and the handle's `finished`\nnever rejects - it resolves on arrival, or when the scroll is canceled or\nsuperseded by a later call.\n\n## Snap\n\n```ts\n// Opt-in momentum snap. On scroll-idle it springs to the nearest stop in the\n// direction you were scrolling. CSS scroll-snap stays the recommended default.\nscroll.snap({ to: 0.25 }) // a stop every 25%\nscroll.snap({ to: [0, 0.4, 1] }) // explicit stops\nscroll.snap({ to: (p, direction) => /* ... */ }) // custom resolver\n```\n\n## Track - the raw primitive\n\n```ts\n// Everything above composes from this: normalized 0..1 over a range, deduped.\nconst t = scroll.track({ target: section })\nt.progress() // read synchronously\nt.on((p) => render(p)) // or subscribe\n\nscroll.dispose() // tears down the loop, observers, and every binding\n```\n\n## More on the controller\n\n```ts\n// markers(): dev-only overlay for a range. Solid lines travel with the content\n// (the element's enter/leave edges); dashed lines are the fixed scroller\n// positions they fire against. When a solid meets a dashed of the same colour,\n// that edge fires. Reads the DOM live - never ship it on.\nconst m = scroll.markers({ target: section, label: 'hero' })\nm.dispose()\n\n// progress(): whole-scroller progress 0..1 (scrollPos / maxScroll), read\n// synchronously. Cheaper than a track() when you only need the page fraction.\nscroll.progress()\n\n// refresh(): re-measure every registered track. Call after a layout change the\n// controller can't observe (a font swap, an image load, a panel that expands).\nscroll.refresh()\n```\n\n## SSR and tests\n\nNothing touches browser globals at import, and the DOM source is created lazily\non the first builder call. For server rendering or a headless test, inject a\ndeterministic source with `createManualScrollSource()` and drive it by hand -\nthe same seam the core exposes with its manual driver.\n\n```ts\nimport { createScroll, createManualScrollSource } from '@underlying/scroll'\n\nconst source = createManualScrollSource({ viewportSize: 800, maxScroll: 2000 })\nconst scroll = createScroll({ source })\n\nsource.setBox(section, { start: 1000, size: 600 }) // place an element (content coords)\nsource.emitScroll(500) // move the scroll, fire listeners\nsource.emitResize() // trigger a re-measure pass\nscroll.progress() // assert against a known number\n```\n\n## The offset grammar\n\nRanges use the `[element edge] [viewport edge]` offset model. The\ndefault is `['start end', 'end start']` - progress `0` when the element's start\nedge meets the viewport's end, `1` when its end edge meets the viewport's start.\n\n```ts\nscroll.track({ target: el, range: ['start center', 'end center'] })\n```\n\n## Reduced motion\n\nHonored automatically (consulting the core's `prefers-reduced-motion` state): a\nlocked scrub stays (it is user-driven and safe), a momentum scrub collapses to\nlocked, parallax is disabled at its resting transform, and a momentum snap\nbecomes an instant jump. The policy re-routes live when the preference changes.\n\n## License\n\nMIT © underlyi.ng\n","readmeFilename":"README.md"}