Janic Duplessis
3ed4bf9046
Summary: The logic to constrain the last spacer size is incorrect in some cases where the spacer is the last spacer, but not the last section in the list. For more context, the role of spacer constraining is explained in this comment: ``` // Without getItemLayout, we limit our tail spacer to the _highestMeasuredFrameIndex to // prevent the user for hyperscrolling into un-measured area because otherwise content will // likely jump around as it renders in above the viewport. ``` For example it is incorrect in the case where we have: ITEMS SPACER ITEMS In this case the spacer is not actually the tail spacer so the constraining is incorrectly appied. This causes issues mainly when using `maintainVisibleContentPosition` since it will cause it to scroll to an incorrect position and then cause the view that was supposed to stay visible to be virtualized away. ## Changelog: [GENERAL] [FIXED] - Fix last spacer constrain logic in VirtualizedList Pull Request resolved: https://github.com/facebook/react-native/pull/41846 Test Plan: Tested using https://gist.github.com/janicduplessis/b67d1fafc08ef848378263208ab93d4c in RN tester, before the change content will jump on first click on add items. Tested using the same example and setting initial posts to 1000, then we can see our content view size is still constrained properly (see scrolling indicator as reference). Reviewed By: yungsters Differential Revision: D51964500 Pulled By: NickGerleman fbshipit-source-id: 4465aa5a36c95466aef6571314973c1e2c9a0f2c
React Native
Learn once, write anywhere:
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React Native brings React's declarative UI framework to iOS and Android. With React Native, you use native UI controls and have full access to the native platform.
- Declarative. React makes it painless to create interactive UIs. Declarative views make your code more predictable and easier to debug.
- Component-Based. Build encapsulated components that manage their state, then compose them to make complex UIs.
- Developer Velocity. See local changes in seconds. Changes to JavaScript code can be live reloaded without rebuilding the native app.
- Portability. Reuse code across iOS, Android, and other platforms.
React Native is developed and supported by many companies and individual core contributors. Find out more in our ecosystem overview.
Contents
- Requirements
- Building your first React Native app
- Documentation
- Upgrading
- How to Contribute
- Code of Conduct
- License
📋 Requirements
React Native apps may target iOS 13.4 and Android 5.0 (API 21) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like Expo can be used to work around this.
🎉 Building your first React Native app
Follow the Getting Started guide. The recommended way to install React Native depends on your project. Here you can find short guides for the most common scenarios:
📖 Documentation
The full documentation for React Native can be found on our website.
The React Native documentation discusses components, APIs, and topics that are specific to React Native. For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
The source for the React Native documentation and website is hosted on a separate repo, @facebook/react-native-website.
🚀 Upgrading
Upgrading to new versions of React Native may give you access to more APIs, views, developer tools, and other goodies. See the Upgrading Guide for instructions.
React Native releases are discussed in this discussion repo.
👏 How to Contribute
The main purpose of this repository is to continue evolving React Native core. We want to make contributing to this project as easy and transparent as possible, and we are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving React Native.
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Contributing Guide
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Open Source Roadmap
You can learn more about our vision for React Native in the Roadmap.
Good First Issues
We have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.
Discussions
Larger discussions and proposals are discussed in @react-native-community/discussions-and-proposals.
📄 License
React Native is MIT licensed, as found in the LICENSE file.
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