Rubén Norte
3aeba22dda
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/51452 Changelog: [internal] This implements a long planned refactor of `IntersectionObserver` to have a proper integration with the Event Loop, which unblocks `FragmentRef` in React Native. The existing integration doesn't integrate with the Event Loop, so the intersection determination doesn't happen as a step in the event loop but in 2 different moments: 1. When you start observing a new target, we check if there are any pending transactions for that target, and otherwise determine the intersection immediately and queue the notifications. 2. Using mount hooks, when a transaction for a surfaceId is mounted, we check intersections for all the observers in that surface. This has an important problem: * If you attach a observer on a target before the target is attached to the tree (something that `FragmentRef` will start doing soon), we don't have a pending transaction so we determine intersections immediately. In that case, it's always "not visible" because it's not attached, and then we immediately trigger a transition when mounted in the same tick. To fix this, we can implement a step in the Event Loop the same way that `IntersectionObserver` does on Web. We would still wait for pending transactions to be mounted to determine intersection timing (the same way we do now, but now checking at the end of the current Event Loop tick), but the dispatch of initial notifications for target that won't change is done at the end of the tick instead of synchronously. It also refactors the list of active observers as a list of shared pointers to `IntersectionObserver` objects, instead of as list of `IntersectionObserver` objects directly. This is necessary to build the list of pending observers (with stable references) while making sure the ownership stays in the list of active observers. Reviewed By: javache Differential Revision: D74883214 fbshipit-source-id: 24accf1dba48d13b5773950a5cbf9ea38f4a1745
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 15.1 and Android 7.0 (API 24) 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 repository, @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.