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fix: Stop re-injecting stale values after a CSS transition changes routing - #10309
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Included review availability: Your plan includes up to 10 reviews per rolling hour; 9 remain after this review. 📝 WalkthroughSummary by CodeRabbit
WalkthroughThe change adds current platform-value retrieval for active CSS transitions. Platform-to-loop migration uses a live scalar value when available. Transition property filtering and registry reconciliation now use loop-routed properties. Android alpha writes preserve React Native opacity handling for React view groups. ChangesPlatform transition migration
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The PR fixes stale CSS transition routing and mid-flight demotion behavior, but an unresolved color edge case can still cause an unintended transparent-to-opaque transition for affected styles. The change is mergeable with explicit owner awareness and follow-up on that bounded visual-correctness risk. Sequence Diagram(s)sequenceDiagram
participant NativeProxy
participant CSSPlatformTransitions
participant CSSPlatformTransitionProxy
participant LoopAnimation
NativeProxy->>CSSPlatformTransitions: expose cssGetPlatformValue
CSSPlatformTransitionProxy->>CSSPlatformTransitions: request currentValue(viewTag, propertyName, timestamp)
CSSPlatformTransitions-->>CSSPlatformTransitionProxy: return scalar platform value
CSSPlatformTransitionProxy->>LoopAnimation: start from current platform value
🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In
`@packages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSPlatformTransitionProxy.cpp`:
- Around line 82-98: Update processDynamicDiffs to read the live value through
currentPlatformValue_ for the affected viewTag and propertyName, and use that
value when forwarding the transition to the loop before calling remove(viewTag,
propertyName). Preserve propertyDiff.first as the fallback when no current
scalar platform value is available, matching the processConfig behavior.
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packages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSPlatformTransitionProxy.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSPlatformTransitionProxy.hpackages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSTransition.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSTransition.hpackages/react-native-reanimated/Common/cpp/reanimated/CSS/registries/CSSTransitionsRegistry.cpppackages/react-native-reanimated/Common/cpp/reanimated/NativeModules/ReanimatedModuleProxy.cpppackages/react-native-reanimated/Common/cpp/reanimated/Tools/PlatformDepMethodsHolder.hpackages/react-native-reanimated/android/src/main/cpp/reanimated/android/CSS/CSSPlatformTransitions.cpppackages/react-native-reanimated/android/src/main/cpp/reanimated/android/CSS/CSSPlatformTransitions.hpackages/react-native-reanimated/android/src/main/cpp/reanimated/android/NativeProxy.cpp
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Inline comments:
In
`@packages/react-native-reanimated/android/src/main/cpp/reanimated/android/CSS/CSSPlatformTransitions.cpp`:
- Around line 146-149: Store the displayed timeline start in an optional value
before replacing an active transition, then use it as the interpolation start
for currentValue in CSSPlatformTransitions.cpp lines 146-149 and
REACSSPlatformTransitions.mm lines 191-194. Keep adjustedStart exclusively for
CSS reversing logic and preserve the existing easing and progress calculations
at both sites.
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packages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSPlatformTransitionProxy.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSPlatformTransitionProxy.hpackages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platform.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platform.hpackages/react-native-reanimated/Common/cpp/reanimated/Tools/PlatformDepMethodsHolder.hpackages/react-native-reanimated/android/src/main/cpp/reanimated/android/CSS/CSSPlatformTransitions.cpppackages/react-native-reanimated/apple/reanimated/apple/CSS/REACSSPlatformTransitions.hpackages/react-native-reanimated/apple/reanimated/apple/CSS/REACSSPlatformTransitions.mmpackages/react-native-reanimated/apple/reanimated/apple/native/PlatformDepMethodsHolderImpl.mm
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Inline comments:
In
`@packages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platform.cpp`:
- Around line 106-129: Update applyTransparentEndpointRule to return immediately
when both fromIsUnset and toIsUnset are true, before either channel substitution
runs; retain the existing one-sided unset behavior for color endpoints.
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packages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platform.cpp
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…, as the loop does" This reverts commit 7090d29.
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🔇 Additional comments (4)
packages/react-native-reanimated/apple/reanimated/apple/CSS/REACSSPlatformTransitions.h (1)
12-12: LGTM!Also applies to: 34-40
packages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSPlatformTransitionProxy.h (2)
36-38: LGTM!Also applies to: 94-101
53-57: 🗄️ Data Integrity & Integration
⚠️ Unverified finding
Sandbox verification was unavailable.Verify all constructor and holder initialization sites.
CSSPlatformTransitionProxynow requirescurrentPlatformValue. Check everyCSSPlatformTransitionProxyconstruction and everyPlatformDepMethodsHolderaggregate initializer. A missed construction fails at compile time. If a feature-disabled path leaves the callback empty,resumeValuemust check it before invocation because an emptystd::functionthrows.Verification script
packages/react-native-reanimated/Common/cpp/reanimated/Tools/PlatformDepMethodsHolder.h (1)
76-77: LGTM!
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packages/react-native-reanimated/Common/cpp/reanimated/CSS/core/transition/CSSPlatformTransitionProxy.hpackages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platform.cpppackages/react-native-reanimated/Common/cpp/reanimated/Tools/PlatformDepMethodsHolder.hpackages/react-native-reanimated/apple/reanimated/apple/CSS/REACSSPlatformTransitions.hpackages/react-native-reanimated/apple/reanimated/apple/CSS/REACSSPlatformTransitions.mm
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- packages/react-native-reanimated/apple/reanimated/apple/CSS/REACSSPlatformTransitions.mm
- packages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platform.cpp
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2 participants
When a property moves between the C++ loop and the platform path, two things went stale.
The updates registry kept the property's last settled value after it moved to the platform, so the commit hook re-injected it over the committed style and the view snapped back. Retention now covers loop-routed properties only, and runs on every transition run so a promotion evicts what it leaves behind.
A mid-flight demotion restarted the loop from the old committed value, flashing before gliding to the new one. The backend now reports the value its animation currently shows, and the demoted transition resumes from there.
Both were reproduced on a physical device and re-verified after the fix. Behavior with
ANDROID_CSS_PLATFORM_TRANSITIONSoff is unchanged.