Jakub TrzebiatowskiandFacebook GitHub Bot
dcb4eb050a
Summary: Attempting to fix the issue https://github.com/facebook/react-native/issues/33418 ## Changelog <!-- Help reviewers and the release process by writing your own changelog entry. Pick one each for the category and type tags: [ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message For more details, see: https://reactnative.dev/contributing/changelogs-in-pull-requests --> [ANDROID] Fixed inconsistent styling for text nodes with many children Pull Request resolved: https://github.com/facebook/react-native/pull/36656 Test Plan: No test plan yet. I'd like to ask for help with creating one. ## Putting template aside, I'd like to ask for a review of the approach I'm suggesting. React Native as-is (at least in some cases) [messes up the styles](https://github.com/facebook/react-native/issues/33418#issuecomment-1485305556) for text nodes with more than 85 children, just like that.  All of this text should be blue. The root cause is that code (on Android) assumes it can assign as many `Spannable` span priority values as we'd like, while in reality, it has to be packed in an 8-bit-long section of the flags mask. So 255 possible values. In the scenario I produced, React generates three spans per text node, and for 85 text nodes, it sums up to 255. For each span, a new priority value is assigned. As I understand it, we don't need that many priority values. If I'm not mistaken, these priorities are crucial only for ensuring that nested styles have precedence over the outer ones. I'm proposing to calculate the priority value "vertically" (based on the node's depth in the tree) not "horizontally" (based on its position). It would be awesome if some core engineer familiar with `ReactAndroid` shared their experience with this module, especially if there are any known cases when we _know_ that we'd like to create overlapping spans fighting over the same aspects of the style. Reviewed By: cortinico Differential Revision: D46094200 Pulled By: NickGerleman fbshipit-source-id: aae195c71684fe50469a1ee1bd30625cbfc3622f
React Native
Learn once, write anywhere:
Build mobile apps with React.
Getting Started · Learn the Basics · Showcase · Contribute · Community · Support
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 12.4 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.
Code of Conduct
Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing Guide
Read our Contributing Guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React Native.
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.
React Native documentation is Creative Commons licensed, as found in the LICENSE-docs file.