Fynix

Fynix is a backend agnostic reactive view tree, styled the way Typst styles a document with set and show rules.

gallery_recording_1080p30.mp4

Features

• Views, rules and transitions never name an engine.
• A view asks for the token traits it reads, so it works under any theme that implements them.
• Set and show rules restyle every view of a kind within a scope, as in Typst.
• State rules hold while a node is hovered, pressed, entering, leaving, or in any state of your own.
• Props bound to the world are read again only when their source changes.
• Views can animate their changes, and animate in and out of the tree.
• #![no_std], with alloc only.

The fynix README walks through each of these with examples.

Example

// A heading and a button whose label turns accent on hover.
mount::<MyTheme>(
    world,
    column((
        label("Settings").size(20.0),
        button(label("Save"))
            .when::<Hovered, _>(|cx: &mut Cx<Bevy, MyTheme>| {
                cx.set::<Label>(|l, _| l.tone(Tone::Accent));
            })
            .transition(Motion::Interact),
    ))
    .gap(8.0),
);

Where Next

• fynix: the core crate, with a guide to building a UI framework on top of it.
• fynix_macros: the #[element] macro.
• bevy_fynix: the Bevy backend, with a gallery example and ready-made looks.

Join the community!

You can join us on the Voxell discord server.

License

fynix is dual-licensed under either:

• MIT License (LICENSE-MIT or http://opensource.org/licenses/MIT)
• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)

This means you can select the license you prefer! This dual-licensing approach is the de-facto standard in the Rust ecosystem and there are very good reasons to include both.