Code Window

macOS-style window chrome for wrapping editor, terminal, or code-preview content: a bordered `bg-card` box plus an optional title bar with the three traffic-light dots, a centred monospace filename, and an actions slot.

blog & long-formclientuiv1.2.0

Preview

Code Window — live renderblocks-codewindow--default

Rendered from the story the storybook (a11y) CI gate runs axe against — the preview can't show something that hasn't been verified.

Install

Two equivalent paths — the URL works in any shadcn-CLI setup; the alias works once you've registered @interlace in your components.json.

Via shadcn URL
npx shadcn@latest add https://ds.interlace.tools/r/code-window.json
With the @interlace alias
npx shadcn@latest add @interlace/code-window

Behavior

What this component does — the keyboard path, the measured colour, the text equivalent and the states it can be in. Every figure below is read out of the test or the source that enforces it by scripts/build-behavior-map.mjs, so nothing here can outlive the gate that keeps it true.

Every semantic colour pair this component's own source uses, measured against the shipped hexes in all 4 theme × scheme combinations. The tightest is muted-foreground on muted at 7.34:1 (harbor · light), against a floor of 4.5:1.

Measured WCAG contrast ratios per token pair and theme
PairinterlacelightinterlacedarkharborlightharbordarkFloor
muted-foreground on mutedcopy on a muted surface8.81:110.48:17.34:18.64:14.5:1SC 1.4.3
muted-foreground on backgroundsecondary copy9.41:111.32:17.82:19.52:14.5:1SC 1.4.3
muted-foreground on cardsecondary copy in a card9.41:110.48:18.25:18.64:14.5:1SC 1.4.3

Text pairs are held to 4.5:1 (WCAG 2.2 SC 1.4.3); borders, rings and chart axes to 3:1 (SC 1.4.11 non-text). Bold is the worst cell in the row — the one a brand fork has to keep an eye on.

Where it renders, how narrow it survives, and whether its lines are inside the coverage gate — three answers a consumer needs before the paste, not after the bug.

Render boundary
'use client'

Hydrates. It brings JavaScript to any route that imports it — put the boundary here, not at the page.

Minimum viewport
none declared

No width floor: it takes the width it is given. Its container owns the layout question.

Coverage gate
not in the gate

The 100% gate currently covers src/charts/**/*.{ts,tsx} and src/lib/**/*.{ts,tsx} and src/primitives/{button-variants,data-state-model,meter-scale,skeleton-variants}.ts and src/primitives/{alert,aspect-ratio,avatar,badge,box,breadcrumb,button,callout,card,checkbox,container,data-state,focus-ring,grade-badge,grid,input,label,meter,pagination,published-date,reading-time,section,section-boundary,separator,skip-link,stack,stat-strip,tag,textarea,typography,visually-hidden}.tsx. This file is outside it — the glob widens in phase 7.2.

History

This component is at v1.2.0, first shipped in @interlace/ui 1.0.0. The version is stamped as a banner into the file the install writes, so the copy in your tree says which one you have — compare it with the number above before deciding whether to re-run the install.

@interlace/ui 1.1.01 entry

Import

2 named exports — pull the parts you need.

Public API
import { CodeWindow, CodeWindowTitleBar } from '@/components/ui/patterns/code-window';

Anatomy

Extracted from the primitive's JSDoc header. The source is the only documentation that can't drift.

CodeWindow                       (div — data-slot="code-window")
    ├─ CodeWindowTitleBar          (div — data-slot="code-window-title-bar")
    │   ├─ span aria-hidden        (data-slot="code-window-traffic-lights")
    │   │   └─ 3 × span size-3     (bg-window-control-close/-minimize/-zoom)
    │   ├─ span                    (title — centred, font-mono text-xs)
    │   └─ span                    (actions — ml-auto)
    └─ children                    (the body: editor, <pre>, anything)

API reference

Parsed from the type declarations in the source — the same file the install writes into your tree, so this table can't drift from the component you get.

CodeWindowTitleBarProps

Also accepts every <div> attribute.

PropTypeDescription
titleReact.ReactNodeOptional title to display in the bar (typically a filename or rule id). If omitted, the bar renders just the traffic-light dots — leaner for cases where a separate header already names the content. Typed as `ReactNode` (not the native HTML `title` attribute) so callers can pass JSX such as a styled filename.
actionsReact.ReactNodeOptional trailing slot (right-aligned). Useful for a "copy" button or a status indicator. Renders inside the title-bar row.

Accessibility

Every story for this component is rendered headlessly and checked with axe-core (wcag2aa, wcag22aa, best-practice, ACT) on every PR. That gate has no continue-on-error, so what ships has zero known violations.

What follows is what static analysis can see. Axe cannot press a key and never sees an overlay open, so the operable-without-a-mouse claim lives in Behavior instead, where the keyboard path is replayed step by step.

Focus + keyboard behaviour
Native element semantics — no interaction layer to get wrong.
Focus ring (WCAG 2.2 SC 2.4.13)
Not focusable — no focus indicator required.
Reduced motion
No animation to gate.
ARIA in the source
None — semantics come from the element or the Base UI primitive rather than hand-written ARIA.

Examples

3 more states from the same story file.

R-rule compliance

Every primitive in @interlace/ui models to the portable 26-rule floor enforced by the componentApi ESLint preset. The cells below pin exactly where each rule applies in this file.

RuleConceptWhere
R4Extends native el`React.ComponentProps<'div'>` on both parts
R6data-slot per part`code-window` / `-title-bar` / `-traffic-lights`
R7className merged + ...rest`cn(BASE, className)` + `{...props}`
R10Composition seams`title` and `actions` are `ReactNode`, not strings
R18Tailwind onlyzero inline `style`
R19Tokens onlydots use `--window-control-*`, not the macOS hex literals
R25Client directive`'use client'` is declared although neither part uses a hook

Dependencies

Base UI primitive
Native / no Base UI dependency
Lucide icons
none
NPM dependencies
none
Registry dependencies

Source

The full implementation — components/ui/patterns/code-window.tsx once installed.

142 lines · TypeScript
'use client';

import * as React from 'react';

// @interlace/code-window v1.2.0 — Interlace design system.
// Docs, props and live preview: https://ds.interlace.tools/c/code-window
// What changed since: https://ds.interlace.tools/c/code-window#history
// Generated banner — keep it, the upgrade diff reads this version.

/**
 * @interlace/ui — CodeWindow + CodeWindowTitleBar
 *
 * macOS-style window chrome for wrapping editor, terminal, or code-preview
 * content: a bordered `bg-card` box plus an optional title bar with the three
 * traffic-light dots, a centred monospace filename, and an actions slot.
 *
 * It is chrome only — it renders whatever you nest inside it and has no
 * opinion about the content.
 *
 * Modeled on MagicUI's `Terminal` chrome (the dots + bar layout convention)

…122 more lines…

Registry JSON

The raw registry record — what the shadcn CLI fetches.