# Menubar (Lumen Halo): prompt.md (v1.0.0)

- id: `lumen-menubar` · version 1.0.0 · component · pro (All-Access)
- category: Navigation
- build: Base UI (this item also ships a Radix build)
- install (this build): `npx shadcn@latest add @beautiful-ui-pro/lumen-menubar`
- npm dependencies: @base-ui/react@^1
- registry dependencies: utils, https://beautiful-ui.dev/r/lumen-foundation.json
- docs: https://beautiful-ui.dev/components/lumen-menubar
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

An app's menus on Lumen's segmented track: a glass thumb glides to the menu that's open, and each menu has the gliding lens. shadcn's Menubar, cut from Lumen glass.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: `@base-ui/react@^1` (Base UI build); `radix-ui@^1` (Radix build).
- Files: `components/ui/lumen/menubar.tsx`; shared code: `lib/beautiful-ui/lumen/portal.ts`, `lib/beautiful-ui/lumen/glyphs.tsx`, `lib/beautiful-ui/lumen/indicator.ts`, `lib/beautiful-ui/lumen/sound.ts`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `lumen-foundation`.
- Builds: separate Base UI and Radix files. Install the one that matches the project (see Install): a free item's bare URL installs the Base UI build of it and its dependencies.
- Exports to keep: `Menubar`, `MenubarMenu / MenubarTrigger`, `MenubarContent …`, and every exported type.
- CSS: the install merges this item's rules (the registry `css` field) into your global stylesheet, in `@layer components`, and adds the lumen foundation (tokens, keyframes, motion levels) once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Tokens: retheme with the `--lumen-*` custom properties (`--lumen-accent`, `--lumen-accent-text`, `--lumen-bad`, `--lumen-bad-text`, `--lumen-focus`, `--lumen-good`, `--lumen-good-text`, `--lumen-hairline`, `--lumen-ink`, `--lumen-muted-ink`, `--lumen-series-1`, `--lumen-series-2`, `--lumen-series-3`, `--lumen-series-4`, `--lumen-series-5`, `--lumen-series-6`, `--lumen-warn`, `--lumen-warn-text`); this item's CSS also reads `--lumen-font-mono`, `--lumen-font-sans`, `--lumen-radius-k`. Never add Tailwind colour classes inside the component.

```tsx
import { Menubar, MenubarContent, MenubarItem, MenubarMenu, MenubarTrigger } from "@/components/ui/lumen/menubar";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `Menubar` | `menubar` | The track with the thumb. |
| `MenubarMenu / MenubarTrigger` | `menubar-trigger` | One menu. |
| `MenubarContent …` | `menubar-content` | As Dropdown Menu. |

Style a part with `[data-slot="<slot>"]` selectors or its `className`; keep the attributes when editing.

## Sound
- Keep every `data-slot` and `data-sound` attribute: the sound layer reads them.
- Installing this item adds no audio. Nothing plays until the app mounts `GlassSoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/glass-sound.json`, import from `@/components/beautiful-ui/glass-sound`); `GlassSoundToggle` is its mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/lumen/menubar.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when
- menubar, app menu, file edit view, desktop menu, shadcn menubar, Lumen
- Desktop-style apps with File, Edit, View menus

### Not when
- Site navigation: use Navigation Menu

## Mistakes
- Keep it to a handful of menus

## Usage

```tsx
import { Menubar, MenubarContent, MenubarItem, MenubarMenu, MenubarTrigger } from "@/components/ui/lumen/menubar";

<Menubar>
  <MenubarMenu>
    <MenubarTrigger>File</MenubarTrigger>
    <MenubarContent>
      <MenubarItem>New dashboard</MenubarItem>
    </MenubarContent>
  </MenubarMenu>
</Menubar>
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `MenubarItem variant / inset` | `"default" \| "destructive" / boolean` |  | As Dropdown Menu. |

Full docs: https://beautiful-ui.dev/components/lumen-menubar

## Customising
- Colours: set the `--lumen-*` tokens on `:root`, or on a container with the `lumen-scope` class to retheme one area. Add the `lumen-inherit` class to follow your shadcn palette instead (`--chart-N`, `--destructive`).
- Dark mode follows the `.dark` class on an ancestor (the shadcn and next-themes convention).
- Update later by re-running the install with `--overwrite` (review the diff if you edited it). Changelog: https://beautiful-ui.dev/r/changelog.json

## Keyboard

| Keys | Action |
|---|---|
| ← → | Between menus; the thumb follows |
| ↑ ↓ | Within a menu |
| Escape | Close |

## Motion inventory

| Interaction | What moves |
|---|---|
| Open | The thumb glides to the open menu |

## Accessibility contract (preserve when editing)
- role=menubar; arrows move between menus and items

## Install

```bash
npx shadcn@latest add @beautiful-ui-pro/lumen-menubar
```

Pro item: needs the `@beautiful-ui-pro` registry in `components.json` and `BEAUTIFUL_UI_TOKEN` in `.env.local` (https://beautiful-ui.dev/account). Setup: https://beautiful-ui.dev/docs/pro. Your components.json `style` picks the build: radix-*, new-york and default get Radix, base-* gets Base UI.

## Credits
- Built on shadcn/ui (https://ui.shadcn.com)

The lumen foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://beautiful-ui.dev/r/lumen-foundation.json.