Radio

A state atom whose appearance (checked, unchecked) is a pure function of the state prop. Pass a state directly or drive it from the Remotion timeline via useCurrentState. The component reads no frame — only the state value you give it.

Installation

$ pnpm dlx shadcn@latest add @remocn/radio

States

RadioState is:

type RadioState =
  | "unchecked"  // empty ring, border = theme.border, no dot
  | "checked"    // ring border = primary, inner dot fills with primary, scales + fades in

checked sets the ring border to primary, fills the inner dot with primary, and animates it in via opacity and scale. unchecked renders an empty ring with the theme border color and a hidden dot.

Snap usage

Pass state directly — the component snaps instantly to that visual. Useful for static previews or when you drive state from your own logic:

import { Radio } from "@/components/remocn/radio";

export const Scene = () => <Radio state="checked" />;

To drive state from the timeline, use useCurrentState:

import { useCurrentState } from "@/lib/remocn-ui";
import { Radio } from "@/components/remocn/radio";

export const Scene = () => {
  const state = useCurrentState(
    [
      { at: 18, state: "checked" },
      { at: 78, state: "unchecked" },
    ],
    "unchecked",
  );

  return <Radio label="Subscribe to updates" state={state} />;
};

Each at is a Sequence-local authored frame. State persists between steps: checked at frame 18 keeps the ring checked until unchecked fires at frame 78. See Concepts for the full useCurrentState API.

Smooth transitions

State changes via state snap with no cross-fade. For animated transitions, use useRadioTransition from the copied use-radio-transition.ts file. It reads the frame, interpolates between state presets, and returns a resolved RadioStyle — pass it to the style prop:

import { Radio } from "@/components/remocn/radio";
import { useRadioTransition } from "@/components/remocn/use-radio-transition";

export const Scene = () => {
  const style = useRadioTransition([
    { at: 18, state: "checked", duration: 14 },
    { at: 78, state: "unchecked", duration: 12 },
  ]);
  return <Radio label="Subscribe to updates" style={style} />;
};

The duration field on each step overrides the file's DEFAULT_DURATION for that specific transition. To globally tune timing and easing, edit use-radio-transition.ts directly in your project — that file is yours (shadcn "own your code" philosophy).

style takes precedence over state when both are provided.

Props