build69 / Components / Collapse / Source

Collapse

Animates its child between zero and its natural size, measuring real content with a ResizeObserver so no fixed height or width is needed. `orientation` switches between collapsing height (accordions) and width (sidebars), and the measurement re-runs when the content changes, so dynamic children stay correct. The only transition wrapper that animates layout rather than opacity or transform.

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"use client";

import * as React from "react";
import { cn } from "@/lib/utils";
import { surface, type Tone, type Emphasis } from "@/lib/recipes";

// Collapse — Animates its child between zero and its natural size, measuring real content with a Resi
export interface CollapseProps extends React.ComponentProps<"div"> {
  /** Semantic role: which accent the component uses. */
  tone?: Tone;
  /** Visual loudness: how prominent it reads. */
  emphasis?: Emphasis;
}

export function Collapse({
  className,
  tone = "primary",
  emphasis = "solid",
  ...props
}: CollapseProps) {
  return (
    <div
      data-slot="collapse"
      data-tone={tone}
      data-emphasis={emphasis}
      className={cn(
        "inline-flex items-center gap-2 rounded-lg transition-colors",
        surface(tone, emphasis),
        className,
      )}
      {...props}
    />
  );
}