Kacie Bawiec
8ced165e53
Summary: [A recent fix](https://github.com/facebook/react-native/pull/33076) to Android to set focusable to true when accessible is true, and this caused several components not to work correctly. This JS change essentially reverts the default back to Text not being focusable unless it is explicitly set. Android's "auto" behavior is better than setting `accessible=true`, and it's also the behavior React Native has had since accessibility on Android was implemented. # Wall of Text Explanation Explanation From Brett's comment [here](https://www.internalfb.com/diff/D35908559?dst_version_fbid=700876567897063&transaction_fbid=477905564133412) blavalla Generally speaking, "accessible" in react native maps to "focusable" in Android views, and the default value for "focusabe" for a TextView (and actually all views) is "auto" not "false". The difference here is that "false" is telling the system to explicitly disallow focus on this element, where as "auto" is telling the system that it's up to whatever service is trying to focus to determine if it should or not. In the case of text, Talkback generally does default to focusing on Text when it's set to "auto", though it also does try to combine this text together with other not-explicitly focusable siblings and roll the focus up to some common ancestor element. In the case of TetraButton here, I would expect the default behavior would be that the text is "auto" focusable, so Talkback would combine the text here with the parent <TetraPressable> (which is explicitly focusable via accessible="true"). ... [This diff](https://github.com/facebook/react-native/pull/33076) was to fix the issue with "disabled" not properly announcing on text views, which was commonly occuring due to the description-combining feature described above. Basically, when Talkback decides to combine not-explicitly-focusable elements together, it ignores properties like "disabled", "selected", etc. so when combined only the text is transferred. The "fix" here was to make sure that if disabled was set, that an element was always explicitly focusable so that it wouldn't be eligible to be combined with others. I think that as a general concept makes sense, but the fix actually surfaced an issue that is likely a much older bug. This line in <Text> ``` accessible={accessible !== false} ``` Is basically always setting accessible="true" unless it's explicitly set to false, and has been in there for years. It was likely added to force text to be accessible by default for iOS. But until [this diff](https://github.com/facebook/react-native/pull/33076) this line was basically a no-op for Android, since setting accessible="true" on text would do nothing at all. [This diff](https://github.com/facebook/react-native/pull/33076) changed this so that setting accessible="true" worked how you'd expect, by making the view explicitly focusable, which was necessary for the disabled behavior to work properly. But that means that now by default all text views are explicitly focusable on both iOS and Android, and this there is likely many components that were built that don't expect this to be the case. It doesn't seem like the right fix here is to revert this behavior to its previous state, as it wasn't working how anyone would expect it to if they looked at the code, and it seems like we were relying on some fairly undocumented behavior of Talkback to get it to work how we wanted. If we truly only wanted accessible="true" to be set on all TextViews for iOS, we should be explicit about it and do a platform check before setting that property. If we didn't want this to be iOS-specific, then everything is now actually working as originally intended. For reference, this is the diff that introduced the default-accessible text - https://www.internalfb.com/diff/D1561326, and the description makes it clear that this was only tested on iOS, and the behavior was explicitly trying to map to iOS norms such as not allowing nested accessible elements. Changelog: [Android][Fixed] Make Text not focusable by default Reviewed By: ryancat Differential Revision: D36991394 fbshipit-source-id: c45d2ada72bb2d6ffeee6947d676a07fb8899449
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 11.0 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.