01
See it and copy it
Framework example
Choose Astro, React, or Elements to compare native usage against the shared visual output. Each example assumes the framework-level setup is already complete.
Drag a separator or focus it and use Arrow Left / Arrow Right.
Double-click a separator to reset pane sizes.
View Resizable code
Framework usage
Switch targets to compare the adapter code. This live preview runs the Astro example. React and Elements use their own behavior APIs; complete the matching framework setup before copying an example.---
import {
Kbd,
Resizable
} from '@santi020k/lumen-astro'
---
<Resizable
aria-label="Workspace panes"
defaultSizes={[28, 44, 28]}
minSize={[18, 24, 18]}
style="height: 18rem;"
>
<aside>
<strong>Navigation</strong>
<p>Projects, files, and saved views.</p>
</aside>
<section aria-label="Editor">
<strong>Editor</strong>
<p>Drag a separator or focus it and use <Kbd>Arrow Left</Kbd> / <Kbd>Arrow Right</Kbd>.</p>
</section>
<section>
<strong>Preview</strong>
<p>Double-click a separator to reset pane sizes.</p>
</section>
</Resizable>import {
Kbd,
Resizable
} from '@santi020k/lumen-react'
export const Example = () => (
<>
<Resizable
aria-label="Workspace panes"
defaultSizes={[28, 44, 28]}
minSize={[18, 24, 18]}
style={{ "height": "18rem" }}
>
<aside>
<strong>Navigation</strong>
<p>Projects, files, and saved views.</p>
</aside>
<section aria-label="Editor">
<strong>Editor</strong>
<p>Drag a separator or focus it and use <Kbd>Arrow Left</Kbd> / <Kbd>Arrow Right</Kbd>.</p>
</section>
<section>
<strong>Preview</strong>
<p>Double-click a separator to reset pane sizes.</p>
</section>
</Resizable>
</>
)<script type="module">
import { defineLumenElements } from '@santi020k/lumen-elements/define'
defineLumenElements()
</script>
<lumen-resizable
aria-label="Workspace panes"
default-sizes={[28, 44, 28]}
min-size={[18, 24, 18]}
style="height: 18rem;">
<aside>
<strong>Navigation</strong>
<p>Projects, files, and saved views.</p>
</aside>
<section aria-label="Editor">
<strong>Editor</strong>
<p>Drag a separator or focus it and use <lumen-kbd>Arrow Left</lumen-kbd> / <lumen-kbd>Arrow Right</lumen-kbd>.</p>
</section>
<section>
<strong>Preview</strong>
<p>Double-click a separator to reset pane sizes.</p>
</section>
</lumen-resizable>02
Choose your target
Add this component
Choose the package for your runtime. All adapters share the Lumen stylesheet. Use the matching registry command when you want a local wrapper for that framework.
pnpm add @santi020k/lumen-astropnpm add @santi020k/lumen-astrolumen add Resizablelumen add Resizablepnpm add @santi020k/lumen-reactpnpm add @santi020k/lumen-reactlumen add Resizable --target reactlumen add Resizable --target reactpnpm add @santi020k/lumen-elementspnpm add @santi020k/lumen-elementslumen add Resizable --target elementslumen add Resizable --target elementsAPI reference
Lumen-specific props and runtime attributes for the Astro primitive. Use the framework differences above and the copyable examples for React composition and Elements attributes; the public adapter types define their supported contracts.
| Attribute | Values | Default | Description |
|---|---|---|---|
| defaultSizes | number[] | - | Sets initial pane sizes as percentages, serialized for the runtime. |
| direction | "horizontal" | "vertical" | "horizontal" | Sets the resize axis and generated handle orientation. |
| maxSize | number | number[] | - | Limits pane growth by percentage; pass an array for per-pane limits. |
| minSize | number | number[] | - | Limits pane shrinkage by percentage; pass an array for per-pane limits. |
| resetOnDoubleClick | boolean | true | Restores default pane sizes when a resize handle is double-clicked. |
| class, className | string | "" | Merges custom classes with the generated ui-* root classes. |
| ...native attributes | HTML attributes | - | Forwards standard attributes to the root element unless the component consumes them. |
Keyboard interactions
Keyboard behavior provided by the Astro UIPrimitives runtime for this component.
| Key | Action |
|---|---|
| ArrowLeft, ArrowRight on a horizontal handle | Resize the leading panel by 2 percentage points, or 10 with Shift held. |
| ArrowUp, ArrowDown on a vertical handle | Resize the leading panel by 2 percentage points, or 10 with Shift held. |
| Home, End on a handle | Resize the leading panel to its configured minimum or maximum size. |