A CSS flexbox implementation in C designed for easy integration into cross-platform widget toolkits.
flex is a flexible box layout system written in C that implements the W3C CSS flexbox specification. It provides a complete layout engine for arranging UI elements in containers, solving the problem of cross-platform layout consistency by offering a standards-compliant foundation for widget toolkits.
Developers building cross-platform UI frameworks or widget toolkits that need a reliable, embeddable layout system. Particularly useful for those creating bindings to languages like C# or other runtimes.
Developers choose flex because it offers a fully compliant CSS flexbox implementation in a minimal, dependency-free C codebase with excellent cross-platform support and easy foreign language interoperability.
Flex is a flexible box layout system written in C, designed to be easy to consume from other languages
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Implements the complete W3C flexbox specification, as verified by the implementation status table, ensuring layout consistency with web standards.
The entire library is contained in just `flex.c` and `flex.h` files, with no external dependencies, making it easy to embed and port across platforms.
Supports builds for macOS, iOS, Android, and Windows via makefiles and Visual Studio, as detailed in the Getting Started section.
Designed with a plain C API for easy binding to languages like C#, with specific bindings available in the `bindings/csharp` directory.
Does not support CSS Grid or other layout models, which may be necessary for complex UI designs that require more advanced arrangements.
As a low-level C library, it demands significant work to integrate into higher-level frameworks or applications, unlike drop-in UI solutions.
Provides only layout logic, so developers must handle rendering, styling, and user interaction separately, increasing development overhead.