Aspect Ratio

Radix renders two divs: an outer wrapper with `position: relative; width:
100%; padding-bottom: (100 / ratio)%`, and the inner element (which gets our
`data-slot` and className) at `position: absolute; inset: 0`. Percentage
padding resolves against the parent's width, which is what locks the ratio;
this works everywhere, unlike relying on the CSS `aspect-ratio` property for
replaced content in older engines. We add `overflow-hidden` by default so
rounded corners clip the media; className overrides it. Children usually take
`size-full object-cover`.

**Pebble (2026-11-03).** New optional `variant`; `well` adds `rounded-xl
bg-muted ring-1 ring-hairline inset-shadow-xs` for empty media slots, and the
root carries `data-variant`. Radix puts the ratio on the outer wrapper's
inline `padding-bottom`, so a parent can animate a ratio change with
`motion-safe:*:transition-[padding-bottom] *:duration-(--motion-base)
*:ease-move`; the component itself stays static. The demo has no gradient
art: a drawn SVG trail map (`preserveAspectRatio="xMidYMid slice"`, so it
crops to any ratio) under a 16:9 / 4:3 / 1:1 switcher, a `well` empty state,
and fixed 3:4 and 21:9 crops of the same map.

<!-- PEBBLE-LICENSE -->

registry/layout/aspect-ratio/aspect-ratio.tsx

"use client";

/* PEBBLE-LICENSE
Built by Pebble. Component: aspect-ratio.

First-party license: MIT

The following first-party terms apply only to original Pebble material.

MIT License

Copyright (c) 2026 Praxys Solutions LLC (Pebble)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

THIRD-PARTY NOTICES
These notices apply to identified upstream portions; Pebble terms do not replace or narrow their rights.

Upstream: https://raw.githubusercontent.com/shadcn-ui/ui/main/LICENSE.md
MIT License

Copyright (c) 2023 shadcn

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
END PEBBLE-LICENSE */

import * as React from "react";
import { AspectRatio as AspectRatioPrimitive } from "radix-ui";

import { cn } from "@/lib/utils";

// Pebble: `plain` is an invisible box; `well` is a recessed frame for media
// that has not loaded or has no edge of its own.
const variants = {
  plain: "",
  well: "rounded-xl bg-muted ring-1 ring-hairline inset-shadow-xs",
} as const;

export type AspectRatioProps = React.ComponentProps<typeof AspectRatioPrimitive.Root> & {
  variant?: keyof typeof variants;
};

/**
 * Locks its child to a width:height ratio (`ratio`, default 1). The box takes
 * the parent's width; the height follows from the ratio.
 */
export function AspectRatio({ variant = "plain", className, ...props }: AspectRatioProps) {
  return (
    <AspectRatioPrimitive.Root
      data-slot="aspect-ratio"
      data-variant={variant}
      className={cn("overflow-hidden", variants[variant], className)}
      {...props}
    />
  );
}