Animated.FlatList prop contentContainerStyle doesn't handle animated values
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Description
Description
As I noted in the heading, the Animated.FlatList component does not accept animated values for the contentContainerStyle property. It only seems to work for style.
This is not the behaviour one would expect from an animated component and should be changed.
React Native version:
System:
OS: macOS 11.5.2
CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
Memory: 196.01 MB / 16.00 GB
Shell: 5.8 - /bin/zsh
Binaries:
Node: 14.17.6 - /usr/local/opt/node@14/bin/node
Yarn: 1.22.11 - /usr/local/bin/yarn
npm: 6.14.15 - /usr/local/opt/node@14/bin/npm
Watchman: 2021.09.06.00 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.10.2 - /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms: iOS 14.5, DriverKit 20.4, macOS 11.3, tvOS 14.5, watchOS 7.4
Android SDK:
API Levels: 28, 29, 30, 31
Build Tools: 29.0.2, 30.0.2, 31.0.0
System Images: android-30 | Google APIs Intel x86 Atom, android-30 | Google Play Intel x86 Atom
Android NDK: Not Found
IDEs:
Android Studio: Arctic Fox 2020.3.1 Arctic Fox 2020.3.1
Xcode: 12.5.1/12E507 - /usr/bin/xcodebuild
Languages:
Java: 1.8.0_292 - /usr/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: 17.0.2 => 17.0.2
react-native: 0.65.1 => 0.65.1
react-native-macos: Not Found
npmGlobalPackages:
*react-native*: Not Found
Steps To Reproduce
Provide a detailed list of steps that reproduce the issue.
- Add
Animated.FlatListwith some sample data to your app - Try to pass an animated value to
contentContainerStyle
Expected Results
I would expect this to work with one of the animated components, but instead the screen freezes.
Snack, code example, screenshot, or link to a repository:
https://snack.expo.dev/@reichhartd/animated_flatlist-example
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked Snack reproduction and inspect the Animated.FlatList entry point, focusing on how contentContainerStyle differs from style. Confirm the animated value causes the screen to freeze, then verify that contentContainerStyle accepts animated values without freezing in the same example.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, react-native
- Domain
- mobile-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100