feat(Resizable): support single-axis sizing (DS-5552) - #483
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`size` and `defaultSize` now accept a single dimension, so an element can be managed in one axis and keep its CSS size in the other. Panels stretched to the full height of their container no longer get that height frozen in pixels. An axis becomes managed once it is given in `size` / `defaultSize` or resized by a handle; the resize handlers keep reporting both dimensions, measured where an axis isn't managed. Also adds `disableKeyboardResize` to `Resizable.Handle` for drag-only handles, and takes the resize start snapshot from the managed axes instead of the measured rect, which drifted while the element animated to the size set last. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
📝 WalkthroughWalkthroughThe Resizable component now accepts partial dimensions, manages each axis independently, measures unmanaged axes, and supports handles that disable keyboard resizing while preserving pointer dragging. ChangesResizable partial sizing
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant ResizableHandle
participant useResizableHandle
participant useResizableState
participant ResizableElement
ResizableHandle->>useResizableHandle: receive resize interaction
useResizableHandle->>useResizableState: apply pointer or keyboard resize
useResizableState->>ResizableElement: write managed axis styles
useResizableState-->>ResizableHandle: report both dimensions
Merge Risk: 🔵 Low · up to Focusable drag-only handles still advertise arrow-key shortcuts that do nothing, which can mislead assistive-technology users. Remove the unavailable shortcuts before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@packages/components/src/components/Resizable/hooks/useResizableHandle.ts`:
- Around line 68-70: Update the accessibility props in useResizableHandle so
aria-keyshortcuts is omitted when disableKeyboardResize is true, matching the
removal of onKeyDown; retain the arrow-key shortcuts only when keyboard resizing
remains enabled.
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📒 Files selected for processing (9)
packages/components/src/components/Resizable/Resizable.mdxpackages/components/src/components/Resizable/Resizable.test.tsxpackages/components/src/components/Resizable/ResizableHandle.tsxpackages/components/src/components/Resizable/hooks/useResizable.tspackages/components/src/components/Resizable/hooks/useResizableHandle.tspackages/components/src/components/Resizable/hooks/useResizableState.tspackages/components/src/components/Resizable/hooks/utils.tspackages/components/src/components/Resizable/types.tstools/public_api_guard/components/Resizable.api.md
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| ...(y !== 0 && { height: nextSize.height }), | ||
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| onResize?.(nextSize); |
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correctness — onResize reports both axes, so a controlled single-axis Resizable re-freezes the unmanaged one.
setManagedSize just above correctly writes only the touched axes, but onResize gets the full two-axis nextSize. A controlled consumer feeding the callback back into size — the exact pattern the Base story and the ## State section teach — therefore promotes the omitted axis to managed on the very first drag.
Verified against this branch:
const [size, setSize] = useState<ResizableSizeConstraints>({ width: 300 });
<Resizable size={size} onResize={setSize}>
<Resizable.Handle direction={[1, 0]} />
</Resizable>;One ArrowRight press → onResize({ width: 301, height: 200 }) → the root’s inline style becomes width: 301px; height: 200px. The height is now frozen in pixels — precisely what the PR description says single-axis sizing removes (“Panels stretched to the full height of their container no longer get that height frozen in pixels”). The feature works uncontrolled and breaks controlled.
Either report the managed shape (ResizableSizeConstraints) so it can be echoed back safely, or hand the merged value to onResize alongside the measured one.
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Kept the handlers reporting both dimensions: reporting only the managed axes would make width / height optional in every callback, 2D included. To control a single axis, take only that axis from the handler — onResize={(size) => setWidth(size.width)} — as shown in the new OneDimension story. A test covers the controlled round-trip.
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| let tabIndex = tabIndexProp ?? 0; | ||
| let tabIndex = tabIndexProp ?? (disableKeyboardResize ? -1 : 0); |
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accessibility — the handle leaves the tab order but keeps its widget ARIA.
Nothing below (lines 107–137) reacts to disableKeyboardResize, so the handle keeps advertising keyboard affordances it no longer has. Verified renders on this branch:
- corner handle →
role="button" tabindex="-1" aria-keyshortcuts="ArrowUp ArrowDown ArrowLeft ArrowRight"— a non-focusable button promising arrow keys that now do nothing. - edge handle →
role="separator" tabindex="-1" aria-valuenow="300".
Per ARIA, a separator is a widget only while it is focusable; a non-focusable one is a static structural separator and does not support aria-valuenow / aria-valuemin / aria-valuemax / aria-orientation. axe-core flags that combination.
When disableKeyboardResize is set and tabIndex is not overridden, drop aria-keyshortcuts on corner handles and the separator value attributes on edge handles.
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Dropped aria-keyshortcuts on drag-only corner handles. The separator values stay: with tabindex="-1" the handle is still focusable, just not tabbable, and a focusable separator must have aria-valuenow.
| expect(getRoot().style.height).toBe(''); | ||
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| it('manages a single dimension when the size defines one axis', () => { |
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test-coverage — every new single-axis test is uncontrolled.
Nothing here exercises size + onResize with one axis omitted, even though the suite already has a controlled test to model it on (line 247). The controlled round-trip is the case that is actually broken — echoing onResize back into size re-freezes the omitted axis after one drag (see the comment on useResizableState.ts).
A test asserting getRoot().style.height === '' after a controlled [1, 0] drag would have caught it, and is the guard that keeps it fixed.
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Added keeps the omitted axis unmanaged in controlled state: after a controlled [1, 0] drag, style.height stays empty.
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| <Story of={Stories.IntrinsicSize} /> | ||
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| ### One dimension |
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docs — the ### Intrinsic size text just above is now stale.
Line 53 still reads “The measured size is fixed in pixels only after the first resize interaction”, which describes the pre-PR behavior. This PR changes exactly that, and its own test edit proves it: the intrinsic-size assertion went from { width: '261px', height: '140px' } to width plus style.height === ''.
A reader following ### Intrinsic size still expects both axes to freeze after one drag and gets the opposite, with the contradicting rule buried in the next section. Suggest “the resized axis is fixed in pixels after the first resize interaction”.
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Reworded: the first resize interaction fixes the resized axes in pixels, the others keep their CSS size.
| const { width, height } = size; | ||
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| return { | ||
| ...(width !== undefined && { |
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reuse — the per-axis clamp rule now exists four times in this file.
This inlines the same clamp(isFiniteNumber(v) ? v : min, min, max) expression that clampResizableSize above already contains, once per axis in each.
The non-finite fallback (NaN / Infinity → the minimum) is exactly the kind of rule that gets changed in one copy and missed in the others, and the normalizes negative and non-finite sizes to the minimum test only covers the normalizeResizableSize path — a divergence in clampResizableSize would go unnoticed.
Extracting the shared helper collapses both functions:
const clampAxis = (value: number | undefined, min: number, max: number) =>
clamp(isFiniteNumber(value) ? value : min, min, max);There was a problem hiding this comment.
Done, both functions use clampAxis now.
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🔵 Needs a closer look
The change reworks subtle resize-state management (managed vs. measured axes, controlled-state callback wiring, and keyboard/pointer interaction handling) whose correctness and accessibility impact warrant human verification despite good test coverage.
Pull request overview
This PR extends the Resizable component so size/defaultSize can manage a single axis, letting the omitted dimension keep its CSS-defined size instead of being frozen in pixels. An axis becomes "managed" once it is provided via size/defaultSize or resized by a handle, while resize callbacks continue reporting both dimensions (measuring the unmanaged axis). It also adds a disableKeyboardResize prop to Resizable.Handle for drag-only handles and takes the resize-start snapshot from managed axes to avoid drift during size animations.
Changes:
- Widened
size/defaultSizetoResizableSizeConstraints(partial) and added per-axis normalization/merging so only defined/resized axes are written to the element's style. - Introduced
applySize+ a managed-size ref to preserve untouched managed axes and report full sizes toonResize, and snapshot the start size from managed axes inhandleMoveStart. - Added
disableKeyboardResizetoResizable.Handle, which strips onlyuseMove'sonKeyDownhandler and defaults the handle out of the tab order (tabIndex = -1) unlesstabIndexoverrides it.
File summaries
| File | Description |
|---|---|
| tools/public_api_guard/components/Resizable.api.md | Regenerated API report reflecting the new prop and widened size types. |
| packages/components/src/components/Resizable/types.ts | Updates size/defaultSize types and adds disableKeyboardResize prop with JSDoc. |
| packages/components/src/components/Resizable/ResizableHandle.tsx | Destructures and forwards disableKeyboardResize to the handle hook. |
| packages/components/src/components/Resizable/hooks/utils.ts | Adds normalizeResizableSize to clamp only defined axes. |
| packages/components/src/components/Resizable/hooks/useResizableState.ts | Adds applySize/managed-size ref and moves onResize out of useControlledState. |
| packages/components/src/components/Resizable/hooks/useResizable.ts | Computes currentSize per-axis and snapshots start size from managed axes; writes only defined axes to style. |
| packages/components/src/components/Resizable/hooks/useResizableHandle.ts | Drops onKeyDown when keyboard resize is disabled and adjusts default tabIndex. |
| packages/components/src/components/Resizable/Resizable.test.tsx | Adds tests for single-axis sizing and disableKeyboardResize behavior. |
| packages/components/src/components/Resizable/Resizable.mdx | Documents one-dimensional sizing and drag-only handles. |
Review details
Suppressed comments (1)
packages/components/src/components/Resizable/Resizable.test.tsx:360
- Same redundant setup as in the previous test: this
renderResizable(...)renders an unused Resizable (with a duplicatedata-testid="resizable") that the test never queries — it only checks thestatic-handlefrom the secondrender(...). Remove this line to keep the test focused and avoid the duplicate test id.
renderResizable([1, 0], { defaultSize: { width: 300 } });
- Files reviewed: 9/9 changed files
- Comments generated: 1
- Review effort level: Balanced
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| it('disables arrow key resizing without breaking dragging', () => { | ||
| renderResizable([1, 0], { defaultSize: { width: 300 } }); |
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Removed, along with the one on line 360.
- Drop aria-keyshortcuts from drag-only corner handles - Start a resize from the announced size instead of the element rect - Memoize the current size and update the managed size with an updater - Document single-axis controlled state with a story and a test - Share the per-axis clamp and clean up the drag-only handle tests Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
sizeanddefaultSizenow accept a single dimension, so an element can be managed in one axis and keep its CSS size in the other. Panels stretched to the full height of their container no longer get that height frozen in pixels.An axis becomes managed once it is given in
size/defaultSizeor resized by a handle; the resize handlers keep reporting both dimensions, measuring an unmanaged axis once, when the resize starts.Also adds
disableKeyboardResizetoResizable.Handlefor drag-only handles, and starts a resize from the size the handles announce instead of the element rect, which drifted while the element animated and is scaled by CSS transforms.Summary by CodeRabbit
New Features
disableKeyboardResizefor handles, disabling arrow-key resizing while preserving pointer dragging.tabIndexavailable to override this behavior.Documentation