Buoyant

Partially working espresso machine UI

Buoyant is a library for writing and rendering SwiftUI-like views in Rust, primarily intended for use on no_std memory-constrained embedded systems.

Get started with the 📖 Book, or take a look at the Espresso example.

While this crate is primarily intended for use with embedded-graphics DrawTargets, it can also be used to render views to the terminal with crossterm.

Example

Here's what a simple animated toggle component could look like:

Toggle

fn toggle_button(is_on: bool) -> impl View<Rgb565, bool> {
    let alignment = if is_on { Alignment::Trailing } else { Alignment::Leading };
    let color = if is_on { Rgb565::GREEN } else { Rgb565::RED };

    Button::new(
        |is_on: &mut bool| *is_on = !*is_on,
        |_| {
            Capsule.foreground_color(color)
                .overlay(
                    alignment,
                    Circle
                        .foreground_color(Rgb565::WHITE)
                        .padding(Edges::All, 2)
                )
            .frame_sized(50, 25)
            .animated(Animation::ease_in_out(Duration::from_millis(500)), is_on)
            .geometry_group()
        }
    )
}

Roadmap

Layout and Rendering

Static layout and animation between layouts are relatively feature-complete, aside from transitions. You should be able to construct most desired layouts and animations.

✅ Stacks of heterogeneous views (VStack, HStack, ZStack)
✅ Stacks of homogeneous views (ForEach)
✅ Common SwiftUI-like primitives (Spacer, Divider, ...)
✅ Common SwiftUI-like modifiers (.frame, .padding, ...)
✅ Conditional views, with match variable binding
✅ Text (embedded-graphics monospace, u8g2, and rusttype fonts)
✅ Images (fixed size)
✅ Interruptible Animations + Curves
🚧 Transitions (partially implemented)
✅ Shape stroke+fill
✅ Common embedded-graphics shape primitives
✅ Custom sizing with GeometryView
🚧 Simulated alpha and antialiasing (rusttype fonts only)
🚧 Charts
💤 Canvas for arbitrary path/shape/raster drawing
💤 Shape styles (e.g. gradients)

Interactivity

Interactivity is under active development, and is not yet feature-complete.

✅ State management
✅ Click/tap routing
✅ Button
✅ ScrollView
🚧 Focus management + keyboard input
💤 TextField

Who should use this?

This project could be used in production by the brave, but is probably better suited for hobby projects at this point. If you're familiar with SwiftUI or Jetpack Compose, you should feel especially at home.

License

Licensed under either of

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

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

buoyant 0.7.0-alpha.0