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MIZU.

SplitPane

Give two working regions the space they need, with a real resizable boundary.

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Live — this one is real

Source

Drag the divider or focus it and use the arrow keys.

Preview

This panel receives 55% of the available space.

Usage

tsx
"use client";

import { useState } from "react";
import { SplitPane } from "mizu-ui";

export function Example() {
  const [value, setValue] = useState(45);
  return (
    <SplitPane
      value={value}
      onValueChange={setValue}
      first={
        <div>
          <h3>Source</h3>
          <p className="mizu-field-hint">
            Drag the divider or focus it and use the arrow keys.
          </p>
        </div>
      }
      second={
        <div>
          <h3>Preview</h3>
          <p className="mizu-field-hint">
            This panel receives {100 - value}% of the available space.
          </p>
        </div>
      }
    />
  );
}

It starts with "use client" because it keeps state or passes functions to components, so it pastes into a Next.js page as it is. Other React setups ignore the directive.

Source & setup

Add this component to your project with the shadcn CLI. The command copies its source into your configured UI directory, with base.css, Mizu’s tokens, and the stylesheets that hold its rules. Each rule lives in one stylesheet, so components you add together never repeat CSS. In a project without a components.json, run npx shadcn@latest init 0xuser64bit/mizu/preset first: plain init installs shadcn’s theme into your global CSS. Then load the fonts.

sh
npx shadcn@latest add 0xuser64bit/mizu/split-pane

Every component imports from its own path, its name in kebab case. To paste the example, replace its mizu-ui import with:

tsx
import { SplitPane } from "@/components/ui/mizu/split-pane";

For npm imports, import mizu-ui/styles.css once. Fonts are optional via mizu-ui/fonts.css. Override --mizu-* tokens or use className for local styling. Uses native React and CSS; install the package peers for root imports. A Client Component: its source starts with “use client”.

Inspect layout/SplitPane.tsx

Source is included in the npm package under src/layout/SplitPane.tsx.

Open full source ↗

Props

PropTypeDefaultDescription
first / secondReactNode—Two independent panels.
value / onValueChangenumber / function—Controlled percentage given to the first panel.
min / max / labelnumber / number / string15 / 85Bounds and separator name.

Accessibility

Focusable separator with orientation, controls and current/min/max values. Arrow keys move 1%, Shift moves 10%; Home/End reach bounds. Pointer capture supports touch.

Motion

Direct manipulation, no spring lag.

Works alongside