bezel

A gpui component library, SwiftUI-lean: style flows through the environment, never through parameters.

https://github.com/user-attachments/assets/6b5f16d0-9f58-48d6-8398-09acb1afa402

use bezel::ui::widgets::{ButtonStyle, Buttons};
theme.button("Save", ButtonStyle::Prominent, None)

Install

[dependencies]
bezel = "0.1"

An app also names the two crates the facade cannot cover — gpui because actions! expands to literal gpui:: paths, and gpui_platform because the facade re-exports gpui but not the platform. Both are our fork of gpui, published under bezel-gpui*; the package key keeps the gpui:: paths the macros and gpui's own docs expect:

gpui = { package = "bezel-gpui", version = "0.3" }
gpui_platform = { package = "bezel-gpui-platform", version = "0.3", features = ["font-kit"] }

Theme

To ship your own colors, register a custom palette:

use bezel::theme::{Theme, set_palette};

// before appearance::init
theme::set_palette(|appearance| {
    let mut theme = Theme::for_appearance(appearance);
    theme.accent = my_brand_accent(appearance);
    theme
}, cx);

One thing is not optional if you use hover fades — ask for frames in your root render, or fades paint once and stick:

if bezel::motion::hover_fades_active() {
    window.request_animation_frame();
}

Build an app

apps/hello is the smallest consumer — one window, a button, a toggle. Every gpui type path goes through bezel::gpui, so a second gpui cannot creep into the graph. The bootstrap, which is the part no snippet can skip:

use bezel::gpui::{App, AppContext as _, Bounds, WindowBounds, WindowOptions, px, size};
use bezel::theme::{self, Theme};
use bezel::ui;

fn main() {
    gpui_platform::application()
        .run(|cx: &mut App| {
            if let Err(err) = ui::register_fonts(cx) {
                eprintln!("FONT REGISTRATION FAILED: {err:?}");
            }
            theme::appearance::init(theme::appearance::AppearanceMode::System, cx);
            let bounds = Bounds::centered(None, size(px(520.0), px(360.0)), cx);
            cx.open_window(
                WindowOptions {
                    window_bounds: Some(WindowBounds::Windowed(bounds)),
                    ..Default::default()
                },
                |window, cx| {
                    theme::appearance::observe_window(window, cx).detach();
                    cx.new(Hello::new)
                },
            )
            .unwrap();
            cx.activate(true);
        });
}

Hello is a struct implementing Render; its render reads the theme with Theme::of(cx) and builds elements through the widgets traits. Run cargo run -p hello and read apps/hello/src/main.rs for the rest.

Provenance