Bringing Flexbox Layouts to React Native Skia: Why I Built It

Introducing react-native-skia-layout, powered by React Native's layout engine, Yoga. React Native Skia has become one of my favorite tools for building high-performance graphics and custom interfaces in React Native. It gives developers access to a powerful rendering engine while maintaining a familiar React programming model. \ However, after building increasingly complex Skia interfaces, I kept running into the same problem: Layout. The Layout Problem Positioning a few elements in Skia is straightforward. <Circle cx={20} cy={20} r={10} color="red" /> <Circle cx={80} cy={20} r={10} color="blue" /> <Circle cx={140} cy={20} r={10} color="green" /> \ But things quickly become more complicated when the UI becomes dynamic. \ What happens when: Text content changes? Images have unknown dimensions? Screen sizes vary? Components need spacing? Elements need to wrap? Content comes from an API? \ Suddenly, every position becomes a calculation. <Circle cx={20} cy={20} r={10} /> <Text x={60} y={20}> Dynamic content </Text> <Image x={200} y={20} /> \ Every new element affects the positioning of every other element. \ The more I built with Skia, the more I found myself writing layout code instead of drawing code. What React Native Gives Us In React Native, we rarely think about coordinates. \ Instead, we describe relationships. <View style={{ flexDirection: "row", gap: 12 }}> <Avatar /> <Text>User Name</Text> </View> \ We don't calculate positions manually. \ Yoga, the layout engine behind React Native, handles: Flexbox Width and height calculations Margins Padding Positioning Alignment \ This is one of the reasons building interfaces in React Native feels productive. What Skia Gives Us Skia excels at rendering. \ It gives us: Shapes Paths Images Text Gradients Effects Animations \ But layout is left entirely to the developer. \ This makes sense because Skia is fundamentally a drawing engine. \ However, as applications grow, layout becomes a significant challenge. Introducing react-native-skia-layout I wanted to bring the familiar Flexbox experience to React Native Skia. \ The result is react-native-skia-layout . \ Instead of manually calculating coordinates: <Circle cx={20} cy={20} r={20} /> <Circle cx={70} cy={20} r={20} /> <Circle cx={120} cy={20} r={20} /> \ You can write: <FlexLayout direction="row" gap={10}> <LayoutCircle width={40} height={40} /> <LayoutCircle width={40} height={40} /> <LayoutCircle width={40} height={40} /> </FlexLayout> \ The layout engine handles positioning automatically. Familiar Flexbox Concepts If you've used React Native before, the API should feel familiar. <FlexLayout direction="column" padding={16} gap={12} > <LayoutParagraph text="Welcome to React Native Skia" /> <LayoutImage width={200} height={120} image={image} /> <LayoutText text="Powered by Yoga" /> </FlexLayout> Supported features include: Flex layouts Width and height constraints Flex sizing Padding Margin Gap Positioning Text layout Image layout Dynamic Layouts One of the biggest advantages is handling dynamic content. <FlexLayout width={300}> <LayoutParagraph text={article.content} /> </FlexLayout> \ The paragraph automatically measures itself and participates in layout just like any other component. \ No manual coordinate calculations required. Debugging Layouts Building a layout engine also means building tools to understand what the layout engine is doing. \ For that reason, layout bounds can be visualized directly. <FlexLayout debug> ... </FlexLayout> <LayoutParagraph debug /> \ This renders the computed layout boxes, making it easier to understand spacing, sizing, and positioning during development. Why I Built It This project started as a small experiment. \ I wanted to see if Yoga's layout model could be applied directly to Skia primitives. \ As I continued building more complex interfaces, the experiment became increasingly useful. \ What began as a helper for a few components evolved into a full layout system capable of arranging text, images, shapes, and custom graphics. \ The goal was simple: Bring the productivity of Flexbox to the flexibility of Skia. What's Next The library is still evolving, and there are many areas I want to improve: Additional Skia primitives Improved text measurement Better debugging tools Animation integrations Developer tooling \ Feedback, ideas, and contributions are welcome. Conclusion React Native Skia makes it possible to build beautiful, high-performance graphics and interfaces. \ As those interfaces grow, layout becomes just as important as rendering. \ react-native-skia-layout aims to fill that gap by bringing familiar Flexbox-powered layouts to Skia primitives. \ If you've ever found yourself manually calculating coordinates for a complex Skia interface, I hope this library makes that process a little easier. \