Install
That writes one file:compositions/components/swipe-rail.html.
Paste it into your composition
Opencompositions/components/swipe-rail.html and copy what is inside into your own composition.
A component has no size or duration of its own. It takes both from the composition
you paste it into.
Variables
Every one of these has a default, so the piece works untouched. Set the ones you want to change on the element:| Variable | Default | Accepts | What it does |
|---|---|---|---|
card_count | 4 | 3 to 5, step 1 | Number of cards rendered in the rail. |
accent | green | green, blue, violet | Active color used by the focused card and contact circle. |
card_label_prefix | Feature | string | Text placed before each card number. |
data-variable-values on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:
<div
data-composition-id="swipe-rail"
data-composition-src="compositions/components/swipe-rail.html"
data-variable-values='{"card_count":4,"accent":"green","card_label_prefix":"Feature"}'
></div>
Source
swipe-rail.html
swipe-rail.html
<!doctype html>
<!--
swipe-rail: HyperFrames video primitive (interaction / gesture / demonstrate)
Concept: a contact circle leads a horizontal card rail through one swipe.
The rail follows the drag, carries momentum after release, then snaps the
next card into focus with a physical settle.
Variables:
- card_count (number, 3 to 5, default 4): cards rendered in the rail.
- accent (enum, default green): active color for focus and contact states.
- card_label_prefix (string, default "Feature"): label before each card number.
Envelope (fixed IN and OUT, elastic HOLD only):
IN_BASE = 2.20s rail reveal, touch, drag, release, momentum, snap
HOLD = elastic = max(0, D - (IN + OUT)); selected card breathes subtly
OUT_BASE = 0.45s clean stage fade and rise
If D is shorter than IN_BASE + OUT_BASE, IN and OUT compress together.
Mount contract: the runtime clones only this template. #root fills the host
box, establishes the container query basis, has no data-width or data-height,
and registers one paused timeline under the hardcoded swipe-rail id.
-->
<html
lang="en"
data-composition-id="swipe-rail"
data-composition-duration="4"
data-composition-variables='[
{ "id": "card_count", "type": "number", "role": "content", "label": "Card count", "description": "Number of cards rendered in the rail.", "default": 4, "min": 3, "max": 5, "step": 1 },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Active color used by the focused card and contact circle.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "card_label_prefix", "type": "string", "role": "content", "label": "Card label prefix", "description": "Text placed before each card number.", "default": "Feature" }
]'
>
<head>
<meta charset="UTF-8" />
<title>Swipe Rail</title>
</head>
<body>
<template>
<div id="root" data-composition-id="swipe-rail" data-duration="4" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
--sr-card-width: 46;
--sr-card-gap: 4;
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
color: #f8fafc;
font-family: Inter, system-ui, sans-serif;
pointer-events: none;
}
.sr-clip {
position: absolute;
inset: 0;
overflow: hidden;
background: radial-gradient(circle at 50% 45%, #1e293b 0%, #0f172a 72%);
}
.sr-stage {
position: absolute;
inset: 0;
overflow: hidden;
opacity: 0;
}
.sr-rail {
position: absolute;
left: 50%;
top: 18cqh;
display: flex;
gap: calc(var(--sr-card-gap) * 1cqw);
height: 64cqh;
will-change: transform;
}
.sr-card {
position: relative;
flex: 0 0 calc(var(--sr-card-width) * 1cqw);
height: 60cqh;
overflow: hidden;
padding: 6cqh 4cqw;
border: 0.16cqmin solid rgba(148, 163, 184, 0.36);
border-radius: 3.2cqmin;
background: #f8fafc;
color: #0f172a;
box-shadow: 0 3cqh 7cqh rgba(2, 6, 23, 0.34);
transform-origin: 50% 50%;
will-change: transform, border-color, box-shadow;
}
.sr-card::before {
content: "";
position: absolute;
inset: 0 0 auto;
height: 1.2cqh;
background: var(--sr-accent);
opacity: 0.38;
}
.sr-index {
display: block;
margin-bottom: 3.2cqh;
color: var(--sr-accent);
font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
font-size: 2.2cqw;
font-weight: 700;
letter-spacing: 0.12em;
}
.sr-label {
display: block;
overflow: hidden;
font-size: 4.2cqw;
font-weight: 760;
line-height: 1.05;
letter-spacing: -0.04em;
text-overflow: ellipsis;
white-space: nowrap;
}
.sr-rule {
display: block;
width: 72%;
height: 1.4cqh;
margin-top: 7cqh;
border-radius: 1cqh;
background: #cbd5e1;
box-shadow:
0 4cqh 0 #e2e8f0,
0 8cqh 0 #e2e8f0;
}
.sr-contact {
position: absolute;
left: 50%;
top: 57%;
width: 8cqw;
aspect-ratio: 1;
margin: -4cqw 0 0 -4cqw;
border: 0.32cqmin solid rgba(255, 255, 255, 0.88);
border-radius: 50%;
background: color-mix(in srgb, var(--sr-accent) 44%, transparent);
box-shadow:
0 0 0 1.2cqmin color-mix(in srgb, var(--sr-accent) 16%, transparent),
0 1.8cqh 4cqh rgba(2, 6, 23, 0.34);
opacity: 0;
will-change: transform, opacity;
}
</style>
<div class="sr-clip clip" data-start="0" data-duration="4" data-track-index="0">
<div class="sr-stage">
<div class="sr-rail" role="list" aria-label="Feature cards"></div>
<div class="sr-contact" aria-hidden="true"></div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
(function () {
"use strict";
var root = document.getElementById("root");
var stage = root.querySelector(".sr-stage");
var rail = root.querySelector(".sr-rail");
var contact = root.querySelector(".sr-contact");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var countValue = Number(vars.card_count);
var cardCount = Number.isFinite(countValue)
? Math.max(3, Math.min(5, Math.round(countValue)))
: 4;
var prefix =
vars.card_label_prefix == null ? "Feature" : String(vars.card_label_prefix);
var accentName =
vars.accent === "blue" || vars.accent === "violet" ? vars.accent : "green";
var accentColors = {
green: "var(--brand, #22c55e)",
blue: "var(--accent, #38bdf8)",
violet: "var(--accent-2, #a78bfa)",
};
root.style.setProperty("--sr-accent", accentColors[accentName]);
// GSAP interpolates colors numerically, so tween values need the
// substituted color rather than the var() form.
var accentColor = getComputedStyle(root).getPropertyValue("--sr-accent").trim();
for (var index = 0; index < cardCount; index += 1) {
var card = document.createElement("article");
card.className = "sr-card";
card.setAttribute("role", "listitem");
var indexEl = document.createElement("span");
indexEl.className = "sr-index";
indexEl.textContent = String(index + 1).padStart(2, "0");
var label = document.createElement("span");
label.className = "sr-label";
label.textContent = prefix + " " + String(index + 1);
var rule = document.createElement("span");
rule.className = "sr-rule";
rule.setAttribute("aria-hidden", "true");
card.append(indexEl, label, rule);
rail.appendChild(card);
}
var cards = rail.querySelectorAll(".sr-card");
var centerIndex = Math.floor((cardCount - 1) / 2);
var targetIndex = centerIndex + 1;
var currentCard = cards[centerIndex];
var targetCard = cards[targetIndex];
var rootStyle = getComputedStyle(root);
var cardWidth = parseFloat(rootStyle.getPropertyValue("--sr-card-width"));
var cardGap = parseFloat(rootStyle.getPropertyValue("--sr-card-gap"));
var cardStep = cardWidth + cardGap;
var initialX = -(centerIndex * cardStep + cardWidth / 2);
var targetX = initialX - cardStep;
// Fixed gesture and exit phases compress together only for short mounts.
var IN_BASE = 2.2;
var OUT_BASE = 0.45;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
var baseTotal = IN_BASE + OUT_BASE;
var envelopeScale = duration < baseTotal ? duration / baseTotal : 1;
var IN = IN_BASE * envelopeScale;
var OUT = OUT_BASE * envelopeScale;
var HOLD = Math.max(0, duration - IN - OUT);
var OUT_START = IN + HOLD;
var gestureScale = IN / IN_BASE;
gsap.set(stage, { opacity: 0, y: "1.5cqh" });
gsap.set(rail, { x: initialX + "cqw" });
gsap.set(cards, { scale: 0.94, opacity: 0.74 });
gsap.set(currentCard, {
scale: 1.02,
opacity: 1,
borderColor: accentColor,
});
gsap.set(contact, { x: "0cqw", y: "0cqh", scale: 0.86, opacity: 0 });
var tl = gsap.timeline({ paused: true });
tl.to(
stage,
{ opacity: 1, y: "0cqh", duration: 0.32 * gestureScale, ease: "power2.out" },
0,
);
tl.to(
contact,
{ opacity: 1, scale: 1, duration: 0.18 * gestureScale, ease: "power2.out" },
0.4 * gestureScale,
);
// Fast initial drag decays under friction while the contact leads the rail.
tl.to(
contact,
{ x: "-28cqw", duration: 0.62 * gestureScale, ease: "power3.out" },
0.66 * gestureScale,
);
tl.to(
rail,
{ x: initialX - 23 + "cqw", duration: 0.62 * gestureScale, ease: "power3.out" },
0.66 * gestureScale,
);
var releaseAt = 1.28 * gestureScale;
tl.to(
contact,
{
y: "-5cqh",
scale: 0.82,
opacity: 0,
duration: 0.24 * gestureScale,
ease: "power2.out",
},
releaseAt,
);
tl.to(
rail,
{
x: initialX - 38 + "cqw",
duration: 0.28 * gestureScale,
ease: "power2.out",
},
releaseAt,
);
// The momentum handoff resolves into one exact card-width snap.
tl.to(
rail,
{ x: targetX + "cqw", duration: 0.64 * gestureScale, ease: "back.out(1.7)" },
1.56 * gestureScale,
);
tl.to(
currentCard,
{
scale: 0.94,
opacity: 0.74,
borderColor: "rgba(148, 163, 184, 0.36)",
duration: 0.48 * gestureScale,
ease: "power2.out",
},
1.5 * gestureScale,
);
tl.to(
targetCard,
{
scale: 1.02,
opacity: 1,
borderColor: accentColor,
boxShadow: "0 3cqh 9cqh rgba(2, 6, 23, 0.42)",
duration: 0.64 * gestureScale,
ease: "back.out(1.7)",
},
1.56 * gestureScale,
);
if (HOLD > 0.4) {
var driftHalf = Math.min(0.55, HOLD / 2);
var driftRepeat = Math.max(0, Math.floor(HOLD / driftHalf) - 1);
tl.to(
targetCard,
{
y: "-0.7cqh",
duration: driftHalf,
ease: "sine.inOut",
yoyo: true,
repeat: driftRepeat,
},
IN,
);
}
tl.to(stage, { opacity: 0, y: "-1.5cqh", duration: OUT, ease: "power2.in" }, OUT_START);
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines["swipe-rail"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
motion-primitive interaction gesture swipe cards rail.