[transition] add scale transition with configurable anchor - #10
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…red test The translation compensation exists for AppKit view-backing layers, which anchor at a corner, but the rendered-edge tests only covered center-anchored plain layers, and the view-renderable test only checked the symmetric center pivot, so a y-axis mistake specific to view-backing layers would have passed every existing test. The new hosted test removes a view renderable with a top-anchored scale and asserts the rendered top edge holds still, covering the corner-anchor and vertical-pivot combination on the real render server.
The takesOverKeyPaths contract predates revivalTransform and only told custom transition authors about revivalPosition, omitting that the render pass also resets the transform before the insert transition runs. The test comments called the AppKit view-backing layer anchor the bottom left corner, which is the unflipped AppKit convention: in ComposeUI's flipped hierarchy the (0, 0) unit point is visually the top left, so the comments now name the unit point instead of a corner.
Seven revival tests built the same six-line additive animation to simulate an in-flight removal's residue, differing only in key path and values. The shared shape (duration, additive, key) now lives in one helper so each test's given block reads as intent and a future change to the leftover shape is a single edit.
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📝 WalkthroughWalkthroughThis change adds an anchor-aware scale transition with revival support. It captures live transforms during transition takeover, compensates for platform-specific layer anchors, expands tests, and updates playground diagnostics and project guidance. ChangesScale transition and revival
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to This change adds anchor-aware scale transitions and revival continuity. The remaining merge risk is limited to a typo in public opacity documentation and does not affect runtime behavior. Sequence Diagram(s)sequenceDiagram
participant ComposeView
participant RenderableTransition
participant CALayer
participant Playground
ComposeView->>CALayer: capture revival transform
ComposeView->>RenderableTransition: provide revival context
RenderableTransition->>CALayer: animate scale and translation
CALayer-->>ComposeView: update rendered transform
Playground->>ComposeView: change scale anchor
ComposeView->>RenderableTransition: rebuild anchor-aware transition
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✅ Passed checks (4 passed)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #10 +/- ##
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+ Coverage 93.94% 94.06% +0.11%
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Files 96 97 +1
Lines 5549 5661 +112
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+ Hits 5213 5325 +112
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In
`@ComposeUI/Sources/ComposeUI/ComposeNode/RenderItem/RenderableTransition`+Opacity.swift:
- Line 37: Update the documentation comment for the renderable transition
opacity behavior to correct the typo in “curren opacity” to “current opacity,”
without changing the surrounding text or implementation.
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ComposeUI/Sources/ComposeUI/ComposeNode/RenderItem/RenderableTransition+Opacity.swiftComposeUI/Sources/ComposeUI/ComposeNode/RenderItem/RenderableTransition+Scale.swiftComposeUI/Sources/ComposeUI/ComposeNode/RenderItem/RenderableTransition+Slide.swift
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Per the AGENTS.md doc comment rule, the scale, slide, and opacity docs keep only what callers observe: insertion and removal semantics, pivot and revival continuity, and zero-duration behavior. Implementation rationale moves out: the opacity retarget-vs-stack reasoning now lives on the private retargetOpacity helper, and the additive mechanics live in the PR description and the takesOverKeyPaths contract doc.
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What
RenderableTransition.scale(from:anchor:timing:options:): insertion grows fromfromto natural size, removal shrinks back, pivoting about a configurableanchor(Layout.Alignment, default.center).transform.scaleanimation is paired with a same-timingtransform.translationcompensation that keeps the anchor fixed for any layer anchor point (AppKit view-backing layers anchor at the (0, 0) unit point, unlike the center anchor elsewhere). The compensation is exact because both channels are affine in the timing's progress.revivalTransform(the model transform captured before the render pass resets it), the transform sibling ofrevivalPosition.CALayerhelper, and scale inserts assert the identity precondition instead of defensively restoring.Why
Scale in/out is the most common missing transition primitive. The additive design matches slide's revival continuity model (interrupting a removal and re-inserting continues the motion without jumps), verified against the render server on both platforms, including that additive
transform.scalecomposes by scalar addition andtransform.translationlands as the unscaled matrix component.How to test
make -C ComposeUI test-macOSandmake -C ComposeUI test-iOS(scale suite: 30 tests covering fresh/revival inserts, removals, zero-duration and delayed paths, anchor compensation for all nine alignments, rendered-edge pivot checks on both layer and view renderables, config-drift revival capture, and cross-transition reset).Screenshot.2026-09-07.at.11.38.40.mp4
Screenshot.2026-09-07.at.11.36.55.mp4
Summary by CodeRabbit
New Features
Bug Fixes
Documentation