Nick GerlemanandFacebook GitHub Bot
2ba86caf18
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/51758 ViewManager’s may implement a measure function (using MapBuffer, or ReadableMap). This isn’t used automatically, but may instead be used, by calling into FabricUIManager via JNI, and passing the component name of the view manager to use. This is only ever called manually, through specific C++ ShadowNodes. Confusingly, for some cases, like `TextInput`, we use the measure function on `RCTText` instead, because this call to FabricUIManager is hidden behind `TextLayoutManager`. This ends up really breaking Facsimile, since we want to measure these in a different way, while still measuring `TextInput` without preparing a layout. This mechanism is also used to inject `ReactTextViewManager` from the Text View Manager, into the measurement process, for both Text, and TextInput. I think we would ideally remove and replace the current View Manager measurement mechanism entirely. The interface doesn’t do what it claims to, and requires calling private Java methods via JNI, which we shouldn’t be encouraging external libraries to do. Only a single 3p librar (react-native-picker) uses this, but we have a lot of internal usages, and the current facility is valuable, for translating surface ID into a context. Ie we could not deprecate it without a well thought out replacement. Instead, this change: 1. Removes the "generalized" version of this for MapBuffer, only ever used by Text 2. Given ourselves a `measureText` function, that will use a spannable processor provided, but go through TextLayoutManager, instead of trying to use this generalized path 3. Documents some of the weirdness of the current setup, without yet deprecating it This will let the Facsimile View Manager: 1. Provide a ReactTextViewManagerCallback, like the previous version allowed, that influences measurement of both Text, and TextInput (which is... strange, but... not trying to boil the ocean here) 2. TextInput can now measure text, even if Facsimile View Manager doesn't implement this traditional measure interface Changelog: [Android][Breaking] - Remove FabricUIManager.measureMapBuffer() and MapBuffer measure functions on ViewManager. Please use ReadableMap variant. [Android][Breaking] - Remove FabricUIManager.measure overload which accepts attachment positions Reviewed By: javache Differential Revision: D75826792 fbshipit-source-id: 6739b1e2e214351b9b95ba782d73cf4278211ab8
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.