Layout Animations for the New Architecture #6055
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Jun 14, 2024
Summary: PR changing the single mountingOverrideDelegate to a vector of those, so other listeners can operate on the transaction. Used by `react-native-screens` in software-mansion/react-native-screens#2134 and `react-native-reanimated` in software-mansion/react-native-reanimated#6055. Till now, only one listener could be added there, meaning that e.g. `Layout Animations` from `react-native`, `Layout Animations` from `react-native-reanimated` and listening for `Screen` removal in `react-native-screens` could not operate at the same time. ## Changelog: <!-- Help reviewers and the release process by writing your own changelog entry. Pick one each for the category and type tags: [GENERAL] [FIXED] - Message For more details, see: https://reactnative.dev/contributing/changelogs-in-pull-requests --> [GENERAL] [FIXED] - Add option for multiple `mountingOverrideDelegates` Pull Request resolved: #44927 Test Plan: The code of `LayoutAnimations` inside `react-native` should work the same since it will add just one listener then. For other cases, different libraries can read/mutate transactions. Reviewed By: javache Differential Revision: D58530278 Pulled By: sammy-SC fbshipit-source-id: d6305963621000be11d51a50cffff64526cca934
piaskowyk
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Nice work guys 👏 |
This was referenced Jul 25, 2024
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Summary
This PR brings layout animations to the New Architecture.
In the Old Architecture layout animations were implemented separately for iOS and Android. The new implementation leverages the
MountingOverrideDelegateto intercept and animate layout changes right before they are sent to the platform. This way we can have a unified implementation across platforms (it should also work beyond Android and iOS).MountingOverrideDelegateThe override delegate is called every time a new transaction is about to be mounted. It gives us full access to the mutations list and allows us to change them. This mechanism is used by RN, also in Layout Animations. It is important to note that this way we never commit a new
ShadowTree- we only change the mutations that are sent to the platform. This means that those changes don't influence the layout of other views, which is consistent with the Old Arch implementation.Limitations
nativeIDsince I was unable to obtain thetagof a view before the animation should startskipExitingdoes not work properly on android (I'm not sure why thecomponentWillUnmountmethod is called there earlier than on iOS)globalOriginXandglobalOriginYcurrently return the values oforiginXandoriginY- this part will probably require a nativeconvertPointfunction to be usedTest plan
Go through the Layout Animations examples in the FabricExample app.