almouro
2f86aafdfd
Summary: ### Motivation My main motivation for this is using nested horizontal `Flashlists` inside a vertical `Flashlist`. Like a `RecyclerView`, since my horizontal lists get recycled, if I scroll say the first horizontal list and scroll down, then when this list gets recycled it continues scrolling even if the content is new:  To handle this, I want to call `scrollTo` everytime a new row appears to reset the scroll offset, however I've realized this doesn't stop the scroll momentum ### The bug When scrolling and calling `scrollTo`, scroll momentum should be stopped and we should scroll to where `scrollTo` asked for. All credit goes to tomekzaw for https://github.com/facebook/react-native/pull/36104 who fixed it for vertical scrollviews I realized we had the same issue for - horizontal scroll views - when calling `scrollToEnd` | Vertical scrollview (working ✅) | Horizontal scrollview (before fix, not stopping ❌) | Horizontal scrollview (after fix ✅)| |--------|--------|--| | ||| Based on https://github.com/facebook/react-native/pull/38728 I kept all those calls to `abortAnimation` on the View Manager ## Changelog: [ANDROID] [FIXED] - Fixed horizontal ScrollView momentum not stopping when calling scrollTo programmatically [ANDROID] [FIXED] - Fixed ScrollView momentum not stopping when calling scrollToEnd programmatically Pull Request resolved: https://github.com/facebook/react-native/pull/39529 Test Plan: My test code is [this](https://gist.github.com/Almouro/3ffcfbda8e2239e64bee93985e243000) Basically: - a scrollview with a few elements - some buttons to trigger a `scrollTo` To reproduce the bug, I scroll then click one of the buttons triggering a `scrollTo` I added `react-native@nightly` to my project, and copy pasted `packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll` folder from this branch to try out my fixes Then tested the following scenarios on Android: | List layout | Method | Not animated | Animated| |--------|--------|--|--| | horizontal | scrollTo | |  | | horizontal | scrollToEnd | | | | vertical | scrollTo | | | | vertical | scrollToEnd |  | | Reviewed By: javache Differential Revision: D49437886 Pulled By: ryancat fbshipit-source-id: 358c9b0eed7dabcbc9b87a15d1a757b414ef514b
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 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.
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.