# Time Picker (Notchset): prompt.md (v1.0.0)

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

A time picker that shows what each hour costs: a 24-hour strip of lollipops sized by load is the hour slider, and a minute segment's ink thumb stretches between stops.

## 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/notchset/time-picker.tsx`; shared code: `lib/beautiful-ui/notchset/time-picker.tsx`, `lib/beautiful-ui/notchset/calendar.tsx`, `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `notchset-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: `TimePicker`, and every exported type.
- CSS: the install adds the notchset foundation (tokens, keyframes, motion levels) to your global stylesheet 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 `--notchset-*` custom properties (`--notchset-check`, `--notchset-control-edge`, `--notchset-draw-from`, `--notchset-ease-bloom`, `--notchset-ease-travel`, `--notchset-fade`, `--notchset-focus-color`, `--notchset-focus-inset`, `--notchset-life-from`, `--notchset-life-ms`, `--notchset-node-blink`, `--notchset-node-bloom`, `--notchset-node-delay`, `--notchset-plate-color`, `--notchset-rise-from`, `--notchset-rule`, `--notchset-scroll`, `--notchset-signal`, `--notchset-sweep-to`). Never add Tailwind colour classes inside the component.

```tsx
import { TimePicker } from "@/components/ui/notchset/time-picker";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `TimePicker` | `time-picker-trigger` | The trigger. |
| `—` | `time-picker-content` | The popup. |

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 `SoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/notchset-sound.json`, import from `@/components/ui/notchset/sound-provider`); `useSound()` gives `muted` and `setMuted` for a mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/notchset/time-picker.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
- time picker, schedule time, cron start, hour picker, time input, Notchset
- Scheduling a job or a send, where the load by hour matters

### Not when
- Exact minutes: use an input with type=time

## Mistakes
- Pass 24 load values, or the strip draws flat

## Usage

```tsx
"use client";

import * as React from "react";
import { TimePicker } from "@/components/ui/notchset/time-picker";

// Load per hour (0–100): busy hours draw muted.
const runLoad = [12, 8, 6, 5, 6, 10, 22, 41, 66, 78, 82, 80, 74, 77, 81, 79, 70, 58, 44, 36, 30, 24, 18, 14];

export function ScheduleTime() {
  const [time, setTime] = React.useState("09:00");
  return <TimePicker value={time} onValueChange={setTime} load={runLoad} zone="UTC" />;
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `value / onValueChange` | `"HH:MM"` |  | 24-hour. |
| `load` | `number[24]` |  | 0–100 per hour; the strip's heights. |
| `peakAt` | `number` |  | Busy hours (muted); default 70. |
| `minutes` | `number[]` |  | Up to four stops; default 0, 15, 30, 45. |
| `zone` | `ReactNode` |  | A label after the time, e.g. UTC. |
| `describeHour` | `(hour, load) => string` |  | The readout and value text. |

Full docs: https://beautiful-ui.dev/components/time-picker

## Customising
- Colours: the component reads your shadcn tokens (`--background`, `--foreground`, `--border` …), refined by the `--notchset-*` tokens. The signal colour is `--notchset-signal` (it falls back to `--destructive`). Set tokens on `:root`, or on any container to retheme one area.
- 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 |
|---|---|
| ← → | Hour |
| Home / End | 00 / 23 |
| Enter | Done |
| Esc | Close |

## Performance

- One SVG of 24 groups; CSS transitions.

## Responsive

- The popup is 314px wide.

## Motion inventory

| Interaction | What moves |
|---|---|
| Hour | The picked lollipop's head pops (260ms) and its stem thickens |
| Minute | The thumb's leading edge moves first, the trailing edge 80ms later (340ms) |
| Time | The trigger's digits roll, ones first |

## Accessibility contract (preserve when editing)
- The strip is a slider (0–23) whose value text includes the load; the minutes are a radiogroup
- Opening focuses the strip; Enter or Esc closes and focus returns to the trigger

## Install

```bash
npx shadcn@latest add @beautiful-ui-pro/time-picker
```

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 notchset 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/notchset-foundation.json.