lluz55 / rui

Experimental Rust UI library

rui

Experimental Rust UI library, inspired by SwiftUI. Early days, but some stuff already works.

rui is immediate mode (there is no retained tree of views), GPU rendered, and has richer layout options than other immediate mode UIs.

discord server

• macOS ✅
• Windows ✅ (see audulus#8)
• Linux ❌ (see audulus#7)

Examples

obligatory Counter (cargo run --example counter):

use rui::*;

fn main() {
    rui(state(
        || 1,
        |count| {
            vstack((
                text(&format!("{}", count.get())).padding(Auto),
                button(text("increment"), move || {
                    count.with_mut(|x| *x += 1);
                })
                .padding(Auto),
            ))
        },
    ));
}

some shapes (cargo run --example shapes):

use rui::*;

fn main() {
    rui(hstack((
        circle()
            .color(RED_HIGHLIGHT)
            .padding(Auto),
        rectangle()
            .corner_radius(5.0)
            .color(AZURE_HIGHLIGHT)
            .padding(Auto)
    )));
}

canvas for gpu drawing (cargo run --example canvas):

use rui::*;

fn main() {
    rui(canvas(|rect, vger| {
        vger.translate(rect.center() - LocalPoint::zero());

        let paint = vger.linear_gradient(
            [-100.0, -100.0],
            [100.0, 100.0],
            AZURE_HIGHLIGHT,
            RED_HIGHLIGHT,
            0.0,
        );

        let radius = 100.0;
        vger.fill_circle(LocalPoint::zero(), radius, paint);
    }));
}

slider with a binding (cargo run --example slider):

use rui::*;

#[derive(Clone)]
struct MyState {
    value: f32,
}

fn main() {
    rui(state(|| MyState { value: 0.0 }, |state| {
        vstack((
            text(&format!("value: {:?}", state.get().value)).padding(Auto),
            hslider(bind!(state, value))
                .thumb_color(RED_HIGHLIGHT)
                .padding(Auto),
        ))
    }));
}

widget gallery (cargo run --example gallery):

Goals

• Encode UI in types to ensure stable identity.
• Use immediate mode initially, then optimize to reduce redraw later.
• Use vger-rs for rendering.
• Minimal boilerplate.
• Good looking.
• Accessible.

Why?

In the long term, I'd like to move Audulus over to Rust. After looking at other available UI options, it seemed best to implement something resembling the existing immediate mode UI system I already have working in Audulus, but better.

Status

• ✅ basic shapes: circle, rounded rectangle
• ✅ basic gestures: tap, drag
• ✅ hstack/vstack
• ✅ text
• ✅ padding
• ✅ offsets
• ✅ state
• ✅ zstack
• ✅ canvas (GPU vector graphics with vger)
• ✅ bindings
• ✅ list
• ✅ sliders
• ✅ knobs
• ✅ editable text (still a bit rough)
• ❌ layout feedback
• ❌ animation

References

Towards principled reactive UI

Towards a unified theory of reactive UI

Flutter's Rendering Pipeline

Static Types in SwiftUI

How Layout Works in SwiftUI