# Announcement Bar (Lumen Halo): prompt.md (v1.0.0)

- id: `lumen-announcement-bar` · version 1.0.0 · component · pro (Pro)
- category: Feedback
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add @beautiful-ui-pro/lumen-announcement-bar`
- npm dependencies: none
- registry dependencies: utils, https://beautiful-ui.dev/r/lumen-foundation.json
- docs: https://beautiful-ui.dev/components/lumen-announcement-bar
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

One quiet line across the top of a page: messages take turns (paused on hover and focus, still under reduced motion), an optional countdown ticks to a date, and dismissing folds it away and remembers.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: none beyond React.
- Files: `components/ui/lumen/controls/announcement-bar.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `lumen-foundation`.
- Builds: one set of files for both, but its dependencies come in Base UI and Radix builds. 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: `AnnouncementBar`, `(message)`, `(countdown)`, `(dismiss)`, 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-foreground`, `--lumen-accent-text`, `--lumen-bad`, `--lumen-bad-text`, `--lumen-chart-accent`, `--lumen-chart-accent-foreground`, `--lumen-chart-accent-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 { AnnouncementBar } from "@/components/ui/lumen/controls/announcement-bar";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `AnnouncementBar` | — | The region; folds when dismissed. |
| `(message)` | — | The current message and its link (announcement-bar-link). |
| `(countdown)` | — | Time left to endsAt. |
| `(dismiss)` | — | The close button. |

## 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/controls/announcement-bar.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
- announcement bar, banner, top bar, site banner, promo bar, launch banner, countdown banner, notice bar, dismissible banner
- A launch, a sale with an end date, scheduled maintenance, a new version: news for everyone on the page
- Two or three short messages that can take turns

### Not when
- Errors or account problems that need action: use Alert in the page
- Feedback on something the person just did: use Toast

## Mistakes
- The dismissal is remembered per browser: don't use the bar for things everyone must see
- With storageKey, the server still renders the bar; it closes right after load for people who dismissed it

## Usage

```tsx
"use client";

import { AnnouncementBar } from "@/components/ui/lumen/controls/announcement-bar";

export function SiteBanner() {
  return (
    <AnnouncementBar
      storageKey="banner-v2-launch"
      endsAt="2026-10-15T17:00:00Z"
      messages={[
        { id: "v2", content: "Version 2 is here: faster reports and a new editor.", href: "/changelog", action: "See what's new" },
        { id: "webinar", content: "Live walkthrough on Thursday at 5pm UTC.", href: "/events", action: "Save a seat" },
      ]}
    />
  );
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `messages` | `{ id, content, href?, action? }[]` |  | One or more; several take turns. href makes the action a link ("Learn more" by default). |
| `interval` | `number` | `6000` | Milliseconds each message shows. |
| `endsAt / onEnd` | `string \| number \| Date / () => void` |  | A countdown to this moment, and a call when it reaches zero. |
| `dismissible` | `boolean` | `true` | A close button. |
| `storageKey` | `string` |  | Remembers a dismissal in localStorage. Use a new key for a new announcement. |
| `open / defaultOpen / onOpenChange` | `boolean / boolean / (open: boolean) => void` |  | Controlled or uncontrolled visibility. A new storageKey is a new campaign: it shows again unless that key was dismissed. |
| `labels` | `Partial<AnnouncementBarLabels>` |  | Every word (region, dismiss, previous, next, learnMore, position, remaining), for other languages. |

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

## 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 |
|---|---|
| Tab | Previous, the link, Next and Dismiss, in order |
| Enter or Space | Step, follow or dismiss |

## Motion inventory

| Interaction | What moves |
|---|---|
| A new message | It rises 5px out of a soft blur |
| Dismiss | The row folds to nothing as it fades; a remembered dismissal closes without a fold on load |

## Accessibility contract (preserve when editing)
- A region named Announcements; rotating messages are not live, so they never interrupt
- Turns pause while the pointer or focus is on the bar, never run under reduced motion, and Previous and Next buttons step by hand
- The countdown is read as words ("2 days, 4 hours, 12 minutes left"); a closed bar is inert

## Install

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

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.