The Tale of a React Native Contribution
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This document summarizes Janic Duplessis's contribution to React Native for adjusting text size to fit its container. It describes how text rendering works in React Native, involving view managers, shadow nodes and JavaScript. It then outlines Janic's process of adding the ability to loop through text spans and reduce font sizes until the text fits, which took a few hours and resulted in an accepted pull request. The document encourages learning about open source dependencies and contributing.
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○ Try single-node VictoriaLogs with persistent volumes - it compresses 1TB of production logs from
Kubernetes to 20GB
● See https://docs.victoriametrics.com/victorialogs/roadmap/
Try it out: https://victoriametrics.com/products/victorialogs/
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The Tale of a React Native Contribution
- 1. 📚 ☕ ⚛ 🦄
- 2. Janic Duplessis Software engineer @th3rdwave React Native core contributor
- 3. Th3rdwave Coffee shop directory and community
- 4. The Tale of a React Native Contribution... 📚 ☕ ⚛ 🦄
- 5. We 💜 designers but... Expectation Reality
- 6. Just change the font size? 😜
- 7. React Native to the rescue!
- 9. SHIP IT!!!
- 10. LOL JK! We test on Android right?!?
- 11. 😭😭😭
- 12. Ohhh noooo
- 13. Deep dive into your node_modules
- 14. Native UI Components • View Manager 🤖 • Shadow Node 🧘 • JavaScript ⚛
- 15. View Manager • Defines and set props using the @ReactProp annotation • Creates the view instance • Runs on the UI thread
- 16. Shadow Node • Responsible for layout • Can also define props using the @ReactProp annotation • Runs on a background thread
- 17. JavaScript • Use requireNativeComponent to get your component • Use it just like any React component!
- 18. Turns out that text is hard 😱
- 19. Spanned Text • Text can have different styles attached at different ranges
- 20. Intrinsic size • This is the preferred size for the view • Text needs to be measured margin padding intrinsic size
- 21. Why is this important? 🤔
- 22. The algorithm layout = measureText(text) if (adjustsTextToFit) { while (!fits(layout)) { text = reduceFontSize(text) layout = measureText(text) } }
- 23. Let's start with the easy part... ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextShadowNode.java
- 24. And on to the fun part...
- 25. 😱😱😱 • Extract the measure code to a separate method • Use the Layout instance returned by our new measure method to figure out if text fits • Loop through spans using Spannable.getSpans and replace those of type ReactAbsoluteSizeSpan with a new one with smaller font size
- 26. A few hours later... 🎉 🎉 🎉
- 27. Based on a true story https://github.com/facebook/react- native/pull/26389
- 28. Open source is fun • Own your dependencies, don't be scared of your node_modules • Learn and grow • Everyone wins
- 29. Thanks for having me!!1 @janicduplessis janicduplessis Check out Th3rdwave on the App Store or Play Store