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Merged
mattgperry merged 2 commits into from
Mar 12, 2026
Merged

Add layout="x" and layout="y" axis constraints #3627

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362e784
Add layout="x" and layout="y" axis constraints for layout animations
mattgperry Mar 10, 2026
f084bb2
Simplify axis-snap logic: use copyAxisInto, remove redundant isShared…
mattgperry Mar 12, 2026
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48 changes: 48 additions & 0 deletions packages/framer-motion/cypress/integration/layout.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -389,6 +389,54 @@ describe("Layout animation", () => {
})
})

it(`It correctly fires layout="x" animations, only animating the x axis`, () => {
cy.visit("?test=layout&type=x")
.wait(50)
.get("#box")
.should(([$box]: any) => {
expectBbox($box, {
top: 0,
left: 0,
width: 100,
height: 200,
})
})
.trigger("click")
.wait(50)
.should(([$box]: any) => {
expectBbox($box, {
top: 100,
left: 100,
width: 200,
height: 300,
})
})
})

it(`It correctly fires layout="y" animations, only animating the y axis`, () => {
cy.visit("?test=layout&type=y")
.wait(50)
.get("#box")
.should(([$box]: any) => {
expectBbox($box, {
top: 0,
left: 0,
width: 100,
height: 200,
})
})
.trigger("click")
.wait(50)
.should(([$box]: any) => {
expectBbox($box, {
top: 50,
left: 200,
width: 300,
height: 250,
})
})
})
Comment on lines +392 to +438
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@greptile-apps greptile-apps bot Mar 10, 2026

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No test coverage for axis constraints with layoutId (shared layout)

The PR description states the feature "Works with both layout and layoutId", but both new Cypress tests use a plain layout="x" / layout="y" element without layoutId. The code path for shared layout transitions (isShared = true) takes a different branch inside notifyLayoutUpdate, and — as noted in the logic comment above — the if (isShared) block appears to contain a bug specific to that path.

Consider adding a test case that uses layout="x" (or "y") together with layoutId to verify that the snap axis truly snaps while the animated axis transitions correctly, and to prevent regressions in the shared-layout flow.


it("Disabling crossfade works as expected", () => {
cy.visit("?test=layout-crossfade")
.wait(50)
Expand Down
6 changes: 3 additions & 3 deletions packages/motion-dom/src/layout/LayoutAnimationBuilder.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -24,17 +24,17 @@ interface LayoutElementRecord {
}

interface LayoutAttributes {
layout?: boolean | "position" | "size" | "preserve-aspect"
layout?: boolean | "position" | "size" | "preserve-aspect" | "x" | "y"
layoutId?: string
}

type LayoutBuilderResolve = (animation: GroupAnimation) => void
type LayoutBuilderReject = (error: unknown) => void

interface ProjectionOptions {
layout?: boolean | "position" | "size" | "preserve-aspect"
layout?: boolean | "position" | "size" | "preserve-aspect" | "x" | "y"
layoutId?: string
animationType?: "size" | "position" | "both" | "preserve-aspect"
animationType?: "size" | "position" | "both" | "preserve-aspect" | "x" | "y"
transition?: Transition
crossfade?: boolean
}
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2 changes: 1 addition & 1 deletion packages/motion-dom/src/node/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -900,7 +900,7 @@ export interface MotionNodeLayoutOptions {
*
* @public
*/
layout?: boolean | "position" | "size" | "preserve-aspect"
layout?: boolean | "position" | "size" | "preserve-aspect" | "x" | "y"

/**
* Enable shared layout transitions between different components with the same `layoutId`.
Expand Down
10 changes: 9 additions & 1 deletion packages/motion-dom/src/projection/node/create-projection-node.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ import { mixNumber } from "../../utils/mix/number"
import { MotionValue, motionValue } from "../../value"
import { resolveMotionValue } from "../../value/utils/resolve-motion-value"
import { mixValues } from "../animation/mix-values"
import { copyAxisDeltaInto, copyBoxInto } from "../geometry/copy"
import { copyAxisDeltaInto, copyAxisInto, copyBoxInto } from "../geometry/copy"
import {
applyBoxDelta,
applyTreeDeltas,
Expand Down Expand Up @@ -2119,6 +2119,14 @@ function notifyLayoutUpdate(node: IProjectionNode) {
axisSnapshot.min = layout[axis].min
axisSnapshot.max = axisSnapshot.min + length
})
} else if (animationType === "x" || animationType === "y") {
const snapAxis = animationType === "x" ? "y" : "x"
copyAxisInto(
isShared
? snapshot.measuredBox[snapAxis]
: snapshot.layoutBox[snapAxis],
layout[snapAxis]
)
} else if (
shouldAnimatePositionOnly(animationType, snapshot.layoutBox, layout)
) {
Expand Down
2 changes: 1 addition & 1 deletion packages/motion-dom/src/projection/node/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -186,7 +186,7 @@ export interface ProjectionNodeOptions {
layoutRoot?: boolean
alwaysMeasureLayout?: boolean
onExitComplete?: VoidFunction
animationType?: "size" | "position" | "both" | "preserve-aspect"
animationType?: "size" | "position" | "both" | "preserve-aspect" | "x" | "y"
layoutId?: string
layout?: boolean | string
visualElement?: VisualElement
Expand Down