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hyperframes/docs/catalog/components/ui-focus-zoom.mdx
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Miguel ÁngelandMiguel Angel Simon Sierra 1ae2067b8d feat(catalog): put the variables panel back, on payloads (#3199) 
* feat(catalog): put the variables panel back, on payloads

The panel drove its preview by loading an .html from docs/public, a type the
host does not publish, so it showed an empty frame in production and was
parked when the catalog was re-landed.

It now mounts the same JSON payload the plain player uses and re-mounts it as
values change, injecting them as window.__hfVariables into the composition head
before any of its scripts run, which is where the runtime reads overrides from.
Doing it in the markup rather than after load is what stops the composition
initialising with the wrong values first.

172 items with variables get the panel back; the playhead carries across a
change so a tweak mid-shot does not jump back to frame zero.

* fix(docs): drop the unused url form and the needless escapes

* fix(docs): the panel cannot reference a binding beside the export

* feat(catalog): make importing an SVG the obvious move

A reader arrives at this control with a shape, not with path data, and the
panel asked for the coordinates first. Import is now the primary action in a
drop target you can see is a drop target, and the raw path sits behind a
disclosure for anyone who wants it.

* feat(cli): let a fruitless catalog search report the gap

An agent that searches by meaning and finds nothing worth installing knows
something we do not: the name of a move the catalog is missing. There was no
way to tell us, so that knowledge was lost at the end of every run.

hyperframes feedback --search-miss "<query>" --wanted "<the move>" records it.
It carries no rating, so it never lands in the rating metric, and it is a
separate deliberate command rather than something catalog --query does on its
own: plain search still sends nothing, which is what the CLI promises.

--rating stops being required at the arg level, since a miss has no rating to
give. The check moved into the run body, where an absent one is now handled
rather than crashing on undefined.

* feat(cli): carry tuned variable values into the install snippet

Someone who tunes a block on its catalog page had no way to keep those values:
the install command was the same one everybody gets, and the tuning stayed on
the page.

hyperframes add <item> --vars '<json>' now prints a mount element carrying
data-variable-values, so the values land where the block is used.

They ride on the host rather than being written into the installed file. That
keeps the composition on disk byte-identical to the registry's, so a later
reinstall can still tell an edit from an update, and it lets two mounts of the
same block carry different values.

* fix(catalog): serve the item's own directory so runtime paths resolve

Some compositions assemble their asset URLs at run time —
"compositions/components/" + texture + ".png" for the texture masks, a font the
compiler pulled into _remote_media — and no scan of the markup can see a string
that does not exist until a script concatenates it. Those items either rendered
black or were dropped to a video that had never been uploaded.

Each item that needs it now has its prepared directory published, and its
payload carries a <base> pointing at it, so any relative path the composition
invents resolves. caption-texture renders its masks again, and
variable-font-flex has a preview at all for the first time: its MP4 and poster
are both 403.

Both layouts are published, because which one a composition asks for differs
per item, and a directory only earns that if it is under 2 MB. The 12 MB
texture sheet keeps the recorded video it already had.

* fix(catalog): let the variables panel actually drive the composition

Every control on the panel was inert. The values reached the composition and
nothing repainted, because the payload had already been compiled: compiling
inlines a mounted component and resolves its variables into the markup and CSS,
so by the time a reader turns a knob there is nothing left to change.

An item that declares variables now ships uncompiled, keeping the mount the
runtime loads at run time, which is the only state where data-variable-values
still means anything. The component travels inline as a data URI rather than a
sibling file, because .html is the one type the docs host will not publish. The
demo's own pinned values come off, so the reader's choices reach the mount
instead of losing to the values the demo picked to show itself off.

Measured on the rendered frame rather than the DOM: green rgb(98,207,144),
blue rgb(6,6,199), violet rgb(177,147,230), and back to green.

docs/public/catalog drops from 48 MB to 35 MB along the way, since an
uncompiled payload carries far less than an inlined one.

* feat(catalog): keep variable changes in the url

A reader who tuned a piece lost it on reload, and had nothing to send anyone.
The values now live in the query string, scoped by composition id so two links
never read each other,and only the ones that differ from the defaults are
written, so changing one knob gives a short URL rather than every variable
spelled out.

replaceState rather than pushState: dragging a slider should not leave a trail
of history entries. An unreadable value is ignored rather than thrown, so a
truncated or hand-edited link opens the piece at its defaults.

* fix(catalog): only rewrite the url when a value actually changed

* refactor(catalog): memoise the declared defaults on their content

* feat(catalog): offer an install command carrying the tuned values

The Install block is generated before anyone touches a knob, so it can only
ever print the plain command. Someone who spent a minute tuning a piece copied
it and got the defaults back.

The panel now carries its own command in the Snippet tab, with --vars holding
exactly the values that differ. An untouched piece still offers the same short
command, so nothing gets noisier for the common case.

* fix(catalog): a piece with nothing to render is a skip, not a failure

caption-blend-difference is a stylesheet and a paragraph of prose — a class you
add to your own captions, with no standalone scene to show. The generator
treated that as a build failure, so every run ended by reporting something
broken when nothing was.

It now reports the shape it is and keeps its recorded video, which is the only
honest preview such an item has. A genuine render failure still throws.

* fix(catalog): restore variables from the url on a cold load

A shared link opened at the defaults. The first render happens on the server,
where there is no window to read the query string from, and React then hydrates
against that markup and never revisits it — so the values only appeared once you
touched a control.

The URL is read again after mount, which is the first moment it exists. The
value is also escaped once now rather than twice: URLSearchParams already
decodes on the way out, and decoding a second time turned an SVG path full of
percent-escapes into something that no longer parsed, besides doubling the
length of every link.

* fix(catalog): mount the preview with the values a link carried

The frame was built from the declared defaults and the shared values were
posted to it afterwards, which is too late for anything the composition reads
once at init: a path arrived after the mark had already been drawn from the
default one, so a link looked right in the panel and wrong on screen.

* feat(catalog): the install command follows the values you tuned

Copying the Install line gave the plain command back, because that block is
generated before anyone touches a knob and had no way to know what changed. The
tuned command only existed in the panel Snippet tab, which is not where anyone
looks for it.

The line now reads the same query string the panel writes, so the two agree
without either component knowing the other exists, and a shared link carries the
right command too. replaceState fires no event, so the panel announces its own
writes.

* fix(catalog): send a text variable to the preview once it is finished

Every other control in the explorer reports a whole value on every event: a
slider at any position is a position, a swatch is a colour. A text field is
not. Typing v3 into a badge posted v first, so the preview remounted and
rendered a composition built from half a word.

The post now waits while a text field has focus and goes out when the edit is
committed, with Enter or by clicking away. The field itself is unchanged and
still tracks every keystroke.

---------

Co-authored-by: Miguel Angel Simon Sierra <miguelangelsi07@gmail.com>
2026-08-10 22:40:01 -04:00

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---
title: "UI Focus Zoom"
description: "A full app surface establishes with one settle, then the camera zooms and pans to an anchored region on its cue and holds the zoomed state, with an optional soft focus halo at the anchor. The surface is a slot with a token-styled skeleton default."
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
<VariablesExplorer
previewSrc="/public/catalog/components/ui-focus-zoom.json"
compositionId="ui-focus-zoom"
compositionSrc="compositions/components/ui-focus-zoom.html"
variables={[{"id":"anchor_x","type":"number","role":"content","label":"Anchor X","description":"Focus anchor, percent from the left edge of the surface.","default":64,"min":0,"max":100,"step":1,"unit":"%"},{"id":"anchor_y","type":"number","role":"content","label":"Anchor Y","description":"Focus anchor, percent from the top edge of the surface.","default":36,"min":0,"max":100,"step":1,"unit":"%"},{"id":"zoom","type":"number","role":"content","label":"Zoom","description":"Camera scale at the focused state.","default":1.6,"min":1,"max":3,"step":0.05},{"id":"zoom_at","type":"number","role":"timing","label":"Zoom at","description":"Seconds from mount start when the camera departs for the anchor. Clamped inside the hold.","default":1.4,"min":0,"max":30,"step":0.1,"unit":"s"},{"id":"halo","type":"enum","role":"style","label":"Halo","description":"Soft accent bloom at the anchor as the camera arrives.","default":"show","options":[{"value":"show","label":"Show"},{"value":"hide","label":"Hide"}]},{"id":"accent","type":"enum","role":"style","label":"Accent","description":"Token the halo and skeleton accent elements ride.","default":"green","options":[{"value":"green","label":"Green"},{"value":"blue","label":"Blue"},{"value":"violet","label":"Violet"}]},{"id":"exit","type":"enum","role":"style","label":"Exit","description":"Optional departure. None holds the final frame.","default":"none","options":[{"value":"none","label":"None"},{"value":"fade","label":"Fade"},{"value":"up","label":"Up"}]}]}
>
```html ui-focus-zoom.html
<!doctype html>
<!--
ui-focus-zoom -- HyperFrames video primitive (product demo / camera)
A full app surface establishes with one settle, then the camera zooms and
pans to an anchored region on its cue and holds the zoomed state. An
optional focus halo blooms softly at the anchor as the camera arrives.
Camera-servo law: the camera lives on ONE world wrapper transform,
translate(x, y) scale(S). A world point offset o from center lands at
S * o + T, so T = -offset * S. Offsets are percentages of the world's own
box (the world fills the viewport), so no pixel measurement is needed and
the primitive stays fully elastic. Micro-drift is built from integer sine
cycles (2 and 3 full cycles) that end at exactly zero before the authored
stillness, so the hold is dead still and every seek is reproducible.
The pan is clamped so the scaled world always covers the viewport:
|T| <= 50 * (S - 1) minus the drift amplitude. Extreme anchors near an
edge center as close as the clamp allows without revealing background.
The surface is a SLOT. Callers supply content by placing an inert template
anywhere in the HOST page (templates never render, and the runtime wipes
the host clip's own children on mount, so the slot lives at document
level):
<template data-slot="ui-focus-zoom-screen"> ... </template>
Slot content may be an <img>, a muted <video>, or arbitrary HTML; direct
img/video children are stretched to cover the surface. When no slot
exists, the primitive renders a token-styled skeleton app (header bar,
sidebar, content cards; hairline borders, surface mixes, one accent
element, no branding).
Variables (declared in data-composition-variables below):
- anchor_x (number percent, default 64): focus anchor from the left edge.
- anchor_y (number percent, default 36): focus anchor from the top edge.
- zoom (number, default 1.6): camera scale at the focused state (1 to 3).
- zoom_at (number seconds, default 1.4): camera departure cue from mount
start; clamped inside [IN, D - OUT - move] so the move never fights
the entrance or the exit.
- halo ("show" | "hide", default "show"): soft accent bloom at the anchor.
- accent ("green" | "blue" | "violet", default "green"): green rides
--brand, blue rides --accent, violet rides --accent-2.
- exit ("none" | "fade" | "up", default "none"): frame roots own
transitions; the default holds the final frame to the last pixel.
Envelope, fixed IN and OUT with elastic HOLD only (never timeScale):
IN_BASE = 0.90s one settle: rise + soft scale + fade
ZOOM_BASE = 1.10s the camera move, power2.inOut servo ease
HOLD = elastic; micro-drift ends at zero, then authored stillness
OUT_BASE = 0.50s only when exit != none
If D < IN_BASE + ZOOM_BASE + OUT_BASE, the phases compress together.
Mount contract: the runtime clones only this template. #root fills the
host box (no data-width/data-height, container-type: size, cqmin units),
is styled via #root only, and registers one paused timeline under the
LITERAL "ui-focus-zoom" key. Camera and drift tween plain objects and
repaint through one applyCamera writer, so any seek order lands the same
transform.
-->
<html
lang="en"
data-composition-id="ui-focus-zoom"
data-composition-duration="4.5"
data-composition-variables='[
{ "id": "anchor_x", "type": "number", "role": "content", "label": "Anchor X", "description": "Focus anchor, percent from the left edge of the surface.", "default": 64, "min": 0, "max": 100, "step": 1, "unit": "%" },
{ "id": "anchor_y", "type": "number", "role": "content", "label": "Anchor Y", "description": "Focus anchor, percent from the top edge of the surface.", "default": 36, "min": 0, "max": 100, "step": 1, "unit": "%" },
{ "id": "zoom", "type": "number", "role": "content", "label": "Zoom", "description": "Camera scale at the focused state.", "default": 1.6, "min": 1, "max": 3, "step": 0.05 },
{ "id": "zoom_at", "type": "number", "role": "timing", "label": "Zoom at", "description": "Seconds from mount start when the camera departs for the anchor. Clamped inside the hold.", "default": 1.4, "min": 0, "max": 30, "step": 0.1, "unit": "s" },
{ "id": "halo", "type": "enum", "role": "style", "label": "Halo", "description": "Soft accent bloom at the anchor as the camera arrives.", "default": "show", "options": [{ "value": "show", "label": "Show" }, { "value": "hide", "label": "Hide" }] },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Token the halo and skeleton accent elements ride.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "style", "label": "Exit", "description": "Optional departure. None holds the final frame.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>UI Focus Zoom</title>
</head>
<body>
<template>
<div id="root" data-composition-id="ui-focus-zoom" data-duration="4.5" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
color: var(--fg, #f8fafc);
font-family: var(--font-body, ui-sans-serif, system-ui, sans-serif);
pointer-events: none;
}
.ufz-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
background: var(--bg, transparent);
}
.ufz-stage {
position: relative;
width: 100%;
height: 100%;
will-change: transform, opacity;
}
/* the fixed frame: the camera moves the world inside this window */
.ufz-frame {
position: absolute;
inset: 0;
overflow: hidden;
border: 0.16cqmin solid color-mix(in srgb, var(--border, #475569) 85%, transparent);
border-radius: calc(var(--radius, 2cqmin) * 1.2);
background: color-mix(in srgb, var(--surface, #0b1016) 96%, var(--ufz-accent));
box-shadow: 0 3cqh 9cqh color-mix(in srgb, var(--bg, #000000) 45%, transparent);
}
/* ONE world wrapper: all camera motion is this element's transform */
.ufz-world {
position: absolute;
inset: 0;
will-change: transform;
}
.ufz-surface {
position: absolute;
inset: 0;
overflow: hidden;
background: color-mix(in srgb, var(--surface, #0b1016) 88%, var(--bg, #05070c));
}
.ufz-surface > img,
.ufz-surface > video {
display: block;
width: 100%;
height: 100%;
object-fit: cover;
}
.ufz-halo {
position: absolute;
z-index: 2;
width: 30cqmin;
height: 30cqmin;
border-radius: 50%;
background: radial-gradient(
circle,
color-mix(in srgb, var(--ufz-accent) 26%, transparent) 0%,
color-mix(in srgb, var(--ufz-accent) 12%, transparent) 42%,
transparent 70%
);
will-change: transform, opacity;
}
/* default skeleton surface: pure token furniture, no branding */
.ufz-skel {
position: absolute;
inset: 0;
display: grid;
grid-template-rows: auto minmax(0, 1fr);
}
.ufz-skel-top {
display: flex;
align-items: center;
gap: var(--space-1, 1.6cqmin);
padding: 1.8cqmin 2.6cqmin;
border-bottom: 0.14cqmin solid
color-mix(in srgb, var(--border, #475569) 55%, transparent);
}
.ufz-skel-mark {
width: 2.6cqmin;
height: 2.6cqmin;
border-radius: 0.8cqmin;
background: color-mix(in srgb, var(--ufz-accent) 74%, var(--surface, #0b1016));
}
.ufz-skel-line {
height: 1.25cqmin;
border-radius: 999px;
background: color-mix(in srgb, var(--fg, #f8fafc) 13%, transparent);
}
.ufz-skel-top .ufz-skel-line:nth-of-type(1) {
width: 9cqmin;
}
.ufz-skel-top .ufz-skel-line:nth-of-type(2) {
width: 6.5cqmin;
}
.ufz-skel-spring {
flex: 1;
}
.ufz-skel-chip {
width: 8.5cqmin;
height: 2.9cqmin;
border: 0.14cqmin solid color-mix(in srgb, var(--ufz-accent) 55%, transparent);
border-radius: 999px;
background: color-mix(in srgb, var(--ufz-accent) 28%, transparent);
}
.ufz-skel-avatar {
width: 2.8cqmin;
height: 2.8cqmin;
border-radius: 50%;
background: color-mix(in srgb, var(--fg, #f8fafc) 18%, transparent);
}
.ufz-skel-body {
display: grid;
grid-template-columns: 22% minmax(0, 1fr);
min-height: 0;
}
.ufz-skel-side {
display: flex;
flex-direction: column;
gap: 2cqmin;
padding: 2.6cqmin;
border-right: 0.14cqmin solid
color-mix(in srgb, var(--border, #475569) 55%, transparent);
}
.ufz-skel-side .ufz-skel-line:nth-child(1) {
width: 78%;
background: color-mix(in srgb, var(--fg, #f8fafc) 22%, transparent);
}
.ufz-skel-side .ufz-skel-line:nth-child(2) {
width: 56%;
}
.ufz-skel-side .ufz-skel-line:nth-child(3) {
width: 66%;
}
.ufz-skel-side .ufz-skel-line:nth-child(4) {
width: 44%;
}
.ufz-skel-side .ufz-skel-line:nth-child(5) {
width: 60%;
}
.ufz-skel-main {
display: flex;
flex-direction: column;
gap: var(--space-2, 1.8cqmin);
min-height: 0;
padding: var(--space-3, 2.8cqmin);
}
.ufz-skel-heading {
width: 34%;
height: 2.5cqmin;
border-radius: 999px;
background: color-mix(in srgb, var(--fg, #f8fafc) 21%, transparent);
}
.ufz-skel-sub {
width: 52%;
height: 1.25cqmin;
border-radius: 999px;
background: color-mix(in srgb, var(--fg, #f8fafc) 9%, transparent);
}
.ufz-skel-cards {
display: grid;
flex: 1;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 2.1cqmin;
min-height: 0;
margin-top: 0.8cqmin;
}
.ufz-skel-card {
display: flex;
flex-direction: column;
gap: 1.5cqmin;
min-height: 0;
padding: 2.1cqmin;
border: 0.14cqmin solid color-mix(in srgb, var(--border, #475569) 60%, transparent);
border-radius: var(--radius, 1.6cqmin);
background: color-mix(in srgb, var(--bg, #05070c) 30%, transparent);
}
.ufz-skel-card .ufz-skel-line {
width: 55%;
}
.ufz-skel-block {
flex: 1;
min-height: 3cqmin;
border-radius: calc(var(--radius, 1.6cqmin) * 0.6);
background: color-mix(in srgb, var(--fg, #f8fafc) 7%, transparent);
}
.ufz-skel-card:nth-child(2) .ufz-skel-block {
background: color-mix(in srgb, var(--ufz-accent) 17%, transparent);
}
</style>
<div
id="ui-focus-zoom-clip"
class="ufz-clip clip"
data-start="0"
data-duration="4.5"
data-track-index="0"
>
<div class="ufz-stage">
<div class="ufz-frame" role="img" aria-label="App surface with a camera focus zoom">
<div class="ufz-world">
<div class="ufz-surface">
<div class="ufz-skel" aria-hidden="true">
<div class="ufz-skel-top">
<span class="ufz-skel-mark"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-spring"></span>
<span class="ufz-skel-chip"></span>
<span class="ufz-skel-avatar"></span>
</div>
<div class="ufz-skel-body">
<div class="ufz-skel-side">
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
</div>
<div class="ufz-skel-main">
<span class="ufz-skel-heading"></span>
<span class="ufz-skel-sub"></span>
<div class="ufz-skel-cards">
<div class="ufz-skel-card">
<span class="ufz-skel-line"></span>
<span class="ufz-skel-block"></span>
</div>
<div class="ufz-skel-card">
<span class="ufz-skel-line"></span>
<span class="ufz-skel-block"></span>
</div>
<div class="ufz-skel-card">
<span class="ufz-skel-line"></span>
<span class="ufz-skel-block"></span>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="ufz-halo" aria-hidden="true"></div>
</div>
</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(".ufz-stage");
var world = root.querySelector(".ufz-world");
var surface = root.querySelector(".ufz-surface");
var halo = root.querySelector(".ufz-halo");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
function num(value, fallback, min, max) {
var parsed = parseFloat(value);
if (!isFinite(parsed)) parsed = fallback;
return Math.min(max, Math.max(min, parsed));
}
var anchorX = num(vars.anchor_x, 64, 0, 100);
var anchorY = num(vars.anchor_y, 36, 0, 100);
var zoom = num(vars.zoom, 1.6, 1, 3);
var zoomAt = num(vars.zoom_at, 1.4, 0, 30);
var haloOn = vars.halo !== "hide";
// Each enum choice routes to a DIFFERENT contract token so the
// variable stays meaningful under a theme.
var accentColors = {
green: "var(--brand, #71f5a7)",
blue: "var(--accent, #61a8ff)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
var exitMode = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.style.setProperty("--ufz-accent", accentColors[accent]);
// SLOT. Caller templates live at HOST DOCUMENT level (the mount
// wipes host-clip children, and templates never render). The
// scoped `document` proxy filters queries to this composition's
// subtree, so the lookup deliberately goes through ownerDocument.
var hostDoc = root.ownerDocument;
var slotTemplate = null;
try {
slotTemplate = hostDoc.querySelector('template[data-slot="ui-focus-zoom-screen"]');
} catch (error) {
slotTemplate = null;
}
if (slotTemplate) {
surface.querySelector(".ufz-skel").remove();
surface.appendChild(hostDoc.importNode(slotTemplate.content, true));
}
/* ===== Camera (camera-servo law): translate(x, y) scale(S) on the
ONE world wrapper. Translate percentages resolve against the
world's own box, which fills the viewport, so a world point at
offset o percent from center lands at S * o + T and the target
transform is T = -(anchor - 50) * S, no measurement needed.
The pan is clamped so the scaled world always covers the
viewport (|T| <= 50 * (S - 1) minus the drift amplitude). ===== */
var DRIFT_X = 0.16;
var DRIFT_Y = 0.11;
var panMax = Math.max(0, 50 * (zoom - 1) - Math.max(DRIFT_X, DRIFT_Y) - 0.2);
var targetX = Math.min(panMax, Math.max(-panMax, -(anchorX - 50) * zoom));
var targetY = Math.min(panMax, Math.max(-panMax, -(anchorY - 50) * zoom));
var cam = { s: 1, x: 0, y: 0 };
var drift = { p: 0, dx: 0, dy: 0 };
function applyCamera() {
world.style.transform =
"translate(" +
(cam.x + drift.dx) +
"%, " +
(cam.y + drift.dy) +
"%) scale(" +
cam.s +
")";
}
applyCamera();
// Halo pinned to the anchor in world space; it rides the camera.
// Explicit both-endpoint state BEFORE the timeline exists: the
// bloom fromTo sits mid-timeline, so without this set a seek that
// lands before the cue would show the halo unstyled.
halo.style.left = anchorX + "%";
halo.style.top = anchorY + "%";
if (!haloOn) halo.remove();
else
gsap.set(halo, {
opacity: 0,
scale: 0.55,
xPercent: -50,
yPercent: -50,
transformOrigin: "50% 50%",
});
// Envelope: fixed IN/ZOOM/OUT, elastic HOLD, never time-scaled.
var IN_BASE = 0.9;
var ZOOM_BASE = 1.1;
var OUT_BASE = exitMode === "none" ? 0 : 0.5;
var STILLNESS = 0.35;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4.5"));
var totalBase = IN_BASE + ZOOM_BASE + OUT_BASE;
var scale = duration < totalBase ? duration / totalBase : 1;
var IN = IN_BASE * scale;
var ZOOM = ZOOM_BASE * scale;
var OUT = OUT_BASE * scale;
var OUT_START = duration - OUT;
// The camera departs on its cue, clamped so the move never fights
// the entrance or the exit.
var zoomStart = Math.min(Math.max(zoomAt, IN), Math.max(IN, OUT_START - ZOOM - 0.05));
var tl = gsap.timeline({ paused: true });
// IN: one settle. Rise + soft scale + fade, smooth ease-out.
tl.fromTo(
stage,
{ opacity: 0, y: "4.5cqh", scale: 0.965, transformOrigin: "50% 60%" },
{ opacity: 1, y: "0cqh", scale: 1, duration: IN, ease: "power3.out" },
0,
);
// Camera servo: one move to the anchored region, then hold zoomed.
tl.to(
cam,
{
s: zoom,
x: targetX,
y: targetY,
duration: ZOOM,
ease: "power2.inOut",
onUpdate: applyCamera,
},
zoomStart,
);
// Micro-drift: 2 and 3 INTEGER sine cycles that end at exactly
// zero before the authored stillness, so the final hold is dead
// still and every seek reproduces the same frame.
var driftDuration = Math.max(0, OUT_START - STILLNESS);
if (driftDuration >= 1.2) {
tl.to(
drift,
{
p: Math.PI * 2 * 2,
duration: driftDuration,
ease: "none",
onUpdate: function () {
drift.dx = Math.sin(drift.p) * DRIFT_X;
drift.dy = Math.sin(drift.p * 1.5) * DRIFT_Y;
applyCamera();
},
},
0,
);
}
// Halo: soft bloom at the anchor as the camera arrives, then hold.
if (haloOn) {
tl.fromTo(
halo,
{ opacity: 0, scale: 0.55, xPercent: -50, yPercent: -50 },
{
opacity: 0.85,
scale: 1,
xPercent: -50,
yPercent: -50,
duration: 0.75 * scale,
ease: "power2.out",
},
zoomStart + ZOOM * 0.5,
);
}
// OUT: only when exit != none; the default holds the last frame.
if (exitMode !== "none") {
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
if (exitMode === "up") {
tl.to(stage, { y: "-4cqh", duration: OUT, ease: "power2.in" }, OUT_START);
}
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines["ui-focus-zoom"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</VariablesExplorer>
## Install
<InstallCommand command="npx hyperframes add ui-focus-zoom" item="ui-focus-zoom" />
That writes one file: `compositions/components/ui-focus-zoom.html`.
## Paste it into your composition
Open `compositions/components/ui-focus-zoom.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 |
| --- | --- | --- | --- |
| `anchor_x` | `64` | 0% to 100%, step 1% | Focus anchor, percent from the left edge of the surface. |
| `anchor_y` | `36` | 0% to 100%, step 1% | Focus anchor, percent from the top edge of the surface. |
| `zoom` | `1.6` | 1 to 3, step 0.05 | Camera scale at the focused state. |
| `zoom_at` | `1.4` | 0s to 30s, step 0.1s | Seconds from mount start when the camera departs for the anchor. Clamped inside the hold. |
| `halo` | `show` | `show`, `hide` | Soft accent bloom at the anchor as the camera arrives. |
| `accent` | `green` | `green`, `blue`, `violet` | Token the halo and skeleton accent elements ride. |
| `exit` | `none` | `none`, `fade`, `up` | Optional departure. None holds the final frame. |
Set them with `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:
```html wrap
<div
data-composition-id="ui-focus-zoom"
data-composition-src="compositions/components/ui-focus-zoom.html"
data-variable-values='{"anchor_x":64,"anchor_y":36,"zoom":1.6,"zoom_at":1.4,"halo":"show","accent":"green","exit":"none"}'
></div>
```
## Source
<Accordion title={`ui-focus-zoom.html`}>
```html
<!doctype html>
<!--
ui-focus-zoom -- HyperFrames video primitive (product demo / camera)
A full app surface establishes with one settle, then the camera zooms and
pans to an anchored region on its cue and holds the zoomed state. An
optional focus halo blooms softly at the anchor as the camera arrives.
Camera-servo law: the camera lives on ONE world wrapper transform,
translate(x, y) scale(S). A world point offset o from center lands at
S * o + T, so T = -offset * S. Offsets are percentages of the world's own
box (the world fills the viewport), so no pixel measurement is needed and
the primitive stays fully elastic. Micro-drift is built from integer sine
cycles (2 and 3 full cycles) that end at exactly zero before the authored
stillness, so the hold is dead still and every seek is reproducible.
The pan is clamped so the scaled world always covers the viewport:
|T| <= 50 * (S - 1) minus the drift amplitude. Extreme anchors near an
edge center as close as the clamp allows without revealing background.
The surface is a SLOT. Callers supply content by placing an inert template
anywhere in the HOST page (templates never render, and the runtime wipes
the host clip's own children on mount, so the slot lives at document
level):
<template data-slot="ui-focus-zoom-screen"> ... </template>
Slot content may be an <img>, a muted <video>, or arbitrary HTML; direct
img/video children are stretched to cover the surface. When no slot
exists, the primitive renders a token-styled skeleton app (header bar,
sidebar, content cards; hairline borders, surface mixes, one accent
element, no branding).
Variables (declared in data-composition-variables below):
- anchor_x (number percent, default 64): focus anchor from the left edge.
- anchor_y (number percent, default 36): focus anchor from the top edge.
- zoom (number, default 1.6): camera scale at the focused state (1 to 3).
- zoom_at (number seconds, default 1.4): camera departure cue from mount
start; clamped inside [IN, D - OUT - move] so the move never fights
the entrance or the exit.
- halo ("show" | "hide", default "show"): soft accent bloom at the anchor.
- accent ("green" | "blue" | "violet", default "green"): green rides
--brand, blue rides --accent, violet rides --accent-2.
- exit ("none" | "fade" | "up", default "none"): frame roots own
transitions; the default holds the final frame to the last pixel.
Envelope, fixed IN and OUT with elastic HOLD only (never timeScale):
IN_BASE = 0.90s one settle: rise + soft scale + fade
ZOOM_BASE = 1.10s the camera move, power2.inOut servo ease
HOLD = elastic; micro-drift ends at zero, then authored stillness
OUT_BASE = 0.50s only when exit != none
If D < IN_BASE + ZOOM_BASE + OUT_BASE, the phases compress together.
Mount contract: the runtime clones only this template. #root fills the
host box (no data-width/data-height, container-type: size, cqmin units),
is styled via #root only, and registers one paused timeline under the
LITERAL "ui-focus-zoom" key. Camera and drift tween plain objects and
repaint through one applyCamera writer, so any seek order lands the same
transform.
-->
<html
lang="en"
data-composition-id="ui-focus-zoom"
data-composition-duration="4.5"
data-composition-variables='[
{ "id": "anchor_x", "type": "number", "role": "content", "label": "Anchor X", "description": "Focus anchor, percent from the left edge of the surface.", "default": 64, "min": 0, "max": 100, "step": 1, "unit": "%" },
{ "id": "anchor_y", "type": "number", "role": "content", "label": "Anchor Y", "description": "Focus anchor, percent from the top edge of the surface.", "default": 36, "min": 0, "max": 100, "step": 1, "unit": "%" },
{ "id": "zoom", "type": "number", "role": "content", "label": "Zoom", "description": "Camera scale at the focused state.", "default": 1.6, "min": 1, "max": 3, "step": 0.05 },
{ "id": "zoom_at", "type": "number", "role": "timing", "label": "Zoom at", "description": "Seconds from mount start when the camera departs for the anchor. Clamped inside the hold.", "default": 1.4, "min": 0, "max": 30, "step": 0.1, "unit": "s" },
{ "id": "halo", "type": "enum", "role": "style", "label": "Halo", "description": "Soft accent bloom at the anchor as the camera arrives.", "default": "show", "options": [{ "value": "show", "label": "Show" }, { "value": "hide", "label": "Hide" }] },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Token the halo and skeleton accent elements ride.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "style", "label": "Exit", "description": "Optional departure. None holds the final frame.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>UI Focus Zoom</title>
</head>
<body>
<template>
<div id="root" data-composition-id="ui-focus-zoom" data-duration="4.5" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
color: var(--fg, #f8fafc);
font-family: var(--font-body, ui-sans-serif, system-ui, sans-serif);
pointer-events: none;
}
.ufz-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
background: var(--bg, transparent);
}
.ufz-stage {
position: relative;
width: 100%;
height: 100%;
will-change: transform, opacity;
}
/* the fixed frame: the camera moves the world inside this window */
.ufz-frame {
position: absolute;
inset: 0;
overflow: hidden;
border: 0.16cqmin solid color-mix(in srgb, var(--border, #475569) 85%, transparent);
border-radius: calc(var(--radius, 2cqmin) * 1.2);
background: color-mix(in srgb, var(--surface, #0b1016) 96%, var(--ufz-accent));
box-shadow: 0 3cqh 9cqh color-mix(in srgb, var(--bg, #000000) 45%, transparent);
}
/* ONE world wrapper: all camera motion is this element's transform */
.ufz-world {
position: absolute;
inset: 0;
will-change: transform;
}
.ufz-surface {
position: absolute;
inset: 0;
overflow: hidden;
background: color-mix(in srgb, var(--surface, #0b1016) 88%, var(--bg, #05070c));
}
.ufz-surface > img,
.ufz-surface > video {
display: block;
width: 100%;
height: 100%;
object-fit: cover;
}
.ufz-halo {
position: absolute;
z-index: 2;
width: 30cqmin;
height: 30cqmin;
border-radius: 50%;
background: radial-gradient(
circle,
color-mix(in srgb, var(--ufz-accent) 26%, transparent) 0%,
color-mix(in srgb, var(--ufz-accent) 12%, transparent) 42%,
transparent 70%
);
will-change: transform, opacity;
}
/* default skeleton surface: pure token furniture, no branding */
.ufz-skel {
position: absolute;
inset: 0;
display: grid;
grid-template-rows: auto minmax(0, 1fr);
}
.ufz-skel-top {
display: flex;
align-items: center;
gap: var(--space-1, 1.6cqmin);
padding: 1.8cqmin 2.6cqmin;
border-bottom: 0.14cqmin solid
color-mix(in srgb, var(--border, #475569) 55%, transparent);
}
.ufz-skel-mark {
width: 2.6cqmin;
height: 2.6cqmin;
border-radius: 0.8cqmin;
background: color-mix(in srgb, var(--ufz-accent) 74%, var(--surface, #0b1016));
}
.ufz-skel-line {
height: 1.25cqmin;
border-radius: 999px;
background: color-mix(in srgb, var(--fg, #f8fafc) 13%, transparent);
}
.ufz-skel-top .ufz-skel-line:nth-of-type(1) {
width: 9cqmin;
}
.ufz-skel-top .ufz-skel-line:nth-of-type(2) {
width: 6.5cqmin;
}
.ufz-skel-spring {
flex: 1;
}
.ufz-skel-chip {
width: 8.5cqmin;
height: 2.9cqmin;
border: 0.14cqmin solid color-mix(in srgb, var(--ufz-accent) 55%, transparent);
border-radius: 999px;
background: color-mix(in srgb, var(--ufz-accent) 28%, transparent);
}
.ufz-skel-avatar {
width: 2.8cqmin;
height: 2.8cqmin;
border-radius: 50%;
background: color-mix(in srgb, var(--fg, #f8fafc) 18%, transparent);
}
.ufz-skel-body {
display: grid;
grid-template-columns: 22% minmax(0, 1fr);
min-height: 0;
}
.ufz-skel-side {
display: flex;
flex-direction: column;
gap: 2cqmin;
padding: 2.6cqmin;
border-right: 0.14cqmin solid
color-mix(in srgb, var(--border, #475569) 55%, transparent);
}
.ufz-skel-side .ufz-skel-line:nth-child(1) {
width: 78%;
background: color-mix(in srgb, var(--fg, #f8fafc) 22%, transparent);
}
.ufz-skel-side .ufz-skel-line:nth-child(2) {
width: 56%;
}
.ufz-skel-side .ufz-skel-line:nth-child(3) {
width: 66%;
}
.ufz-skel-side .ufz-skel-line:nth-child(4) {
width: 44%;
}
.ufz-skel-side .ufz-skel-line:nth-child(5) {
width: 60%;
}
.ufz-skel-main {
display: flex;
flex-direction: column;
gap: var(--space-2, 1.8cqmin);
min-height: 0;
padding: var(--space-3, 2.8cqmin);
}
.ufz-skel-heading {
width: 34%;
height: 2.5cqmin;
border-radius: 999px;
background: color-mix(in srgb, var(--fg, #f8fafc) 21%, transparent);
}
.ufz-skel-sub {
width: 52%;
height: 1.25cqmin;
border-radius: 999px;
background: color-mix(in srgb, var(--fg, #f8fafc) 9%, transparent);
}
.ufz-skel-cards {
display: grid;
flex: 1;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 2.1cqmin;
min-height: 0;
margin-top: 0.8cqmin;
}
.ufz-skel-card {
display: flex;
flex-direction: column;
gap: 1.5cqmin;
min-height: 0;
padding: 2.1cqmin;
border: 0.14cqmin solid color-mix(in srgb, var(--border, #475569) 60%, transparent);
border-radius: var(--radius, 1.6cqmin);
background: color-mix(in srgb, var(--bg, #05070c) 30%, transparent);
}
.ufz-skel-card .ufz-skel-line {
width: 55%;
}
.ufz-skel-block {
flex: 1;
min-height: 3cqmin;
border-radius: calc(var(--radius, 1.6cqmin) * 0.6);
background: color-mix(in srgb, var(--fg, #f8fafc) 7%, transparent);
}
.ufz-skel-card:nth-child(2) .ufz-skel-block {
background: color-mix(in srgb, var(--ufz-accent) 17%, transparent);
}
</style>
<div
id="ui-focus-zoom-clip"
class="ufz-clip clip"
data-start="0"
data-duration="4.5"
data-track-index="0"
>
<div class="ufz-stage">
<div class="ufz-frame" role="img" aria-label="App surface with a camera focus zoom">
<div class="ufz-world">
<div class="ufz-surface">
<div class="ufz-skel" aria-hidden="true">
<div class="ufz-skel-top">
<span class="ufz-skel-mark"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-spring"></span>
<span class="ufz-skel-chip"></span>
<span class="ufz-skel-avatar"></span>
</div>
<div class="ufz-skel-body">
<div class="ufz-skel-side">
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
<span class="ufz-skel-line"></span>
</div>
<div class="ufz-skel-main">
<span class="ufz-skel-heading"></span>
<span class="ufz-skel-sub"></span>
<div class="ufz-skel-cards">
<div class="ufz-skel-card">
<span class="ufz-skel-line"></span>
<span class="ufz-skel-block"></span>
</div>
<div class="ufz-skel-card">
<span class="ufz-skel-line"></span>
<span class="ufz-skel-block"></span>
</div>
<div class="ufz-skel-card">
<span class="ufz-skel-line"></span>
<span class="ufz-skel-block"></span>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="ufz-halo" aria-hidden="true"></div>
</div>
</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(".ufz-stage");
var world = root.querySelector(".ufz-world");
var surface = root.querySelector(".ufz-surface");
var halo = root.querySelector(".ufz-halo");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
function num(value, fallback, min, max) {
var parsed = parseFloat(value);
if (!isFinite(parsed)) parsed = fallback;
return Math.min(max, Math.max(min, parsed));
}
var anchorX = num(vars.anchor_x, 64, 0, 100);
var anchorY = num(vars.anchor_y, 36, 0, 100);
var zoom = num(vars.zoom, 1.6, 1, 3);
var zoomAt = num(vars.zoom_at, 1.4, 0, 30);
var haloOn = vars.halo !== "hide";
// Each enum choice routes to a DIFFERENT contract token so the
// variable stays meaningful under a theme.
var accentColors = {
green: "var(--brand, #71f5a7)",
blue: "var(--accent, #61a8ff)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
var exitMode = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.style.setProperty("--ufz-accent", accentColors[accent]);
// SLOT. Caller templates live at HOST DOCUMENT level (the mount
// wipes host-clip children, and templates never render). The
// scoped `document` proxy filters queries to this composition's
// subtree, so the lookup deliberately goes through ownerDocument.
var hostDoc = root.ownerDocument;
var slotTemplate = null;
try {
slotTemplate = hostDoc.querySelector('template[data-slot="ui-focus-zoom-screen"]');
} catch (error) {
slotTemplate = null;
}
if (slotTemplate) {
surface.querySelector(".ufz-skel").remove();
surface.appendChild(hostDoc.importNode(slotTemplate.content, true));
}
/* ===== Camera (camera-servo law): translate(x, y) scale(S) on the
ONE world wrapper. Translate percentages resolve against the
world's own box, which fills the viewport, so a world point at
offset o percent from center lands at S * o + T and the target
transform is T = -(anchor - 50) * S, no measurement needed.
The pan is clamped so the scaled world always covers the
viewport (|T| <= 50 * (S - 1) minus the drift amplitude). ===== */
var DRIFT_X = 0.16;
var DRIFT_Y = 0.11;
var panMax = Math.max(0, 50 * (zoom - 1) - Math.max(DRIFT_X, DRIFT_Y) - 0.2);
var targetX = Math.min(panMax, Math.max(-panMax, -(anchorX - 50) * zoom));
var targetY = Math.min(panMax, Math.max(-panMax, -(anchorY - 50) * zoom));
var cam = { s: 1, x: 0, y: 0 };
var drift = { p: 0, dx: 0, dy: 0 };
function applyCamera() {
world.style.transform =
"translate(" +
(cam.x + drift.dx) +
"%, " +
(cam.y + drift.dy) +
"%) scale(" +
cam.s +
")";
}
applyCamera();
// Halo pinned to the anchor in world space; it rides the camera.
// Explicit both-endpoint state BEFORE the timeline exists: the
// bloom fromTo sits mid-timeline, so without this set a seek that
// lands before the cue would show the halo unstyled.
halo.style.left = anchorX + "%";
halo.style.top = anchorY + "%";
if (!haloOn) halo.remove();
else
gsap.set(halo, {
opacity: 0,
scale: 0.55,
xPercent: -50,
yPercent: -50,
transformOrigin: "50% 50%",
});
// Envelope: fixed IN/ZOOM/OUT, elastic HOLD, never time-scaled.
var IN_BASE = 0.9;
var ZOOM_BASE = 1.1;
var OUT_BASE = exitMode === "none" ? 0 : 0.5;
var STILLNESS = 0.35;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4.5"));
var totalBase = IN_BASE + ZOOM_BASE + OUT_BASE;
var scale = duration < totalBase ? duration / totalBase : 1;
var IN = IN_BASE * scale;
var ZOOM = ZOOM_BASE * scale;
var OUT = OUT_BASE * scale;
var OUT_START = duration - OUT;
// The camera departs on its cue, clamped so the move never fights
// the entrance or the exit.
var zoomStart = Math.min(Math.max(zoomAt, IN), Math.max(IN, OUT_START - ZOOM - 0.05));
var tl = gsap.timeline({ paused: true });
// IN: one settle. Rise + soft scale + fade, smooth ease-out.
tl.fromTo(
stage,
{ opacity: 0, y: "4.5cqh", scale: 0.965, transformOrigin: "50% 60%" },
{ opacity: 1, y: "0cqh", scale: 1, duration: IN, ease: "power3.out" },
0,
);
// Camera servo: one move to the anchored region, then hold zoomed.
tl.to(
cam,
{
s: zoom,
x: targetX,
y: targetY,
duration: ZOOM,
ease: "power2.inOut",
onUpdate: applyCamera,
},
zoomStart,
);
// Micro-drift: 2 and 3 INTEGER sine cycles that end at exactly
// zero before the authored stillness, so the final hold is dead
// still and every seek reproduces the same frame.
var driftDuration = Math.max(0, OUT_START - STILLNESS);
if (driftDuration >= 1.2) {
tl.to(
drift,
{
p: Math.PI * 2 * 2,
duration: driftDuration,
ease: "none",
onUpdate: function () {
drift.dx = Math.sin(drift.p) * DRIFT_X;
drift.dy = Math.sin(drift.p * 1.5) * DRIFT_Y;
applyCamera();
},
},
0,
);
}
// Halo: soft bloom at the anchor as the camera arrives, then hold.
if (haloOn) {
tl.fromTo(
halo,
{ opacity: 0, scale: 0.55, xPercent: -50, yPercent: -50 },
{
opacity: 0.85,
scale: 1,
xPercent: -50,
yPercent: -50,
duration: 0.75 * scale,
ease: "power2.out",
},
zoomStart + ZOOM * 0.5,
);
}
// OUT: only when exit != none; the default holds the last frame.
if (exitMode !== "none") {
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
if (exitMode === "up") {
tl.to(stage, { y: "-4cqh", duration: OUT, ease: "power2.in" }, OUT_START);
}
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines["ui-focus-zoom"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</Accordion>
{/* hf:generated-footer */}
Tagged `camera` `product-demo` `zoom` `focus` `pan` `slot` `servo`.
## Related topics
- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)
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