Resizable

Accessible resizable panel groups and layouts.

import {
  ResizableHandle,
  ResizablePanel,
  ResizablePanelGroup,
} from "@/registry/base/ui/resizable";

export default function ResizableDemo() {
  return (
    <div className="h-[200px] w-full max-w-md">
      <ResizablePanelGroup className="rounded-lg border">
        <ResizablePanel defaultSize="50%">
          <div className="flex h-full items-center justify-center p-6">
            <span className="font-semibold">One</span>
          </div>
        </ResizablePanel>
        <ResizableHandle withHandle />
        <ResizablePanel defaultSize="50%">
          <ResizablePanelGroup orientation="vertical">
            <ResizablePanel defaultSize="25%">
              <div className="flex h-full items-center justify-center p-6">
                <span className="font-semibold">Two</span>
              </div>
            </ResizablePanel>
            <ResizableHandle withHandle />
            <ResizablePanel defaultSize="75%">
              <div className="flex h-full items-center justify-center p-6">
                <span className="font-semibold">Three</span>
              </div>
            </ResizablePanel>
          </ResizablePanelGroup>
        </ResizablePanel>
      </ResizablePanelGroup>
    </div>
  );
}

Installation

npx shadcn@latest add https://sevenui.dev/r/resizable.json

Usage

import {
  ResizableHandle,
  ResizablePanel,
  ResizablePanelGroup,
} from "@/components/ui/resizable";

<div className="h-[200px] w-full">
  <ResizablePanelGroup className="rounded-lg border">
    <ResizablePanel defaultSize="50%">One</ResizablePanel>
    <ResizableHandle withHandle />
    <ResizablePanel defaultSize="50%">Two</ResizablePanel>
  </ResizablePanelGroup>
</div>;

API reference

A thin wrapper over react-resizable-panels (pinned to ^4.12.3) — ResizablePanelGroup, ResizablePanel, and ResizableHandle map directly to that library’s Group, Panel, and Separator. All props of the underlying primitives apply.

The v4 API differs from the direction/array-layout shape covered by most react-resizable-panels v2 tutorials:

• Use orientation="horizontal" | "vertical" (default horizontal), not direction.
• defaultSize, minSize, maxSize, and collapsedSize take a number | string. A bare number is pixels — always pass a percent string like defaultSize="50%". px/em/rem/vh/vw unit strings are also accepted.
• onLayoutChange/onLayoutChanged report layout as an object keyed by panel id, not an array.
• Imperative access goes through the groupRef (on ResizablePanelGroup) and panelRef (on ResizablePanel) props, not a ref you attach yourself.
• ResizableHandle takes a withHandle prop (default false) that renders a visible drag-grip; the bar itself styles off the aria-orientation attribute the library sets. Double-clicking a handle resets its adjacent panels to their default size.
• Keyboard: arrow keys resize the adjacent panels by 5% per press, Home/End jump to the min/max size, and Enter toggles a collapsible panel’s collapsed state.
• To persist layouts across sessions, compose the library’s own useDefaultLayout hook directly rather than reimplementing storage.

The wrappers are thin passthroughs — orientation styling on both the group (aria-[orientation=vertical]:flex-col) and the handle reads the aria-orientation attribute the library sets itself.

Because the Group’s inline height: 100% / width: 100% win over utility classes on the group itself, give a fixed-height layout its size on a wrapper element instead, as in the demo above.