Guido

A reactive Rust GUI library for Wayland layer shell widgets.

Overview

Guido is a GPU-accelerated GUI library for building Wayland layer shell applications like status bars, panels, and overlays. It features a fine-grained reactive programming model inspired by Floem, with automatic dependency tracking and efficient re-rendering.

Note: This project is developed collaboratively using AI agents.

Features

• Fine-Grained Reactivity - Thread-safe reactive signals with automatic dependency tracking. Signals are Copy, eliminating manual cloning
• State Layer System - Declarative hover/pressed style overrides with animations and Material-style ripple effects
• GPU Rendering - Hardware-accelerated rendering via wgpu with SDF-based shapes
• Transform System - Translate, rotate, and scale widgets with proper hit testing and animations
• Multi-Surface Apps - Create multiple layer shell surfaces that share reactive state, with dynamic property modification
• Superellipse Corners - Configurable corner curvature from squircle (iOS-style) to bevel to scoop
• SDF Borders - Crisp anti-aliased borders using signed distance field rendering
• Component Macro - #[component] macro for creating reusable widgets with reactive props, callbacks, children, and slots
• Type Erasure - AnyWidget and Widget::into_any() for conditional widget branches
• Composable Widgets - Build UIs from minimal primitives with pluggable Flex layout
• Layer Shell Support - Native Wayland layer shell integration for status bars and panels
• HiDPI Support - Automatic scaling for high-resolution displays
• Image Widget - Display raster images (PNG, JPEG, WebP) and SVGs with GPU texture caching
• Scrollable Containers - Vertical/horizontal scrolling with customizable scrollbars and momentum
• Text Styling - Font family (sans-serif, serif, monospace, custom) and weight (thin to black) support

Quick Start

use guido::prelude::*;

fn main() {
    let count = create_signal(0);

    let (app, _) = App::new().add_surface(
        SurfaceConfig::new()
            .height(48)
            .anchor(Anchor::TOP | Anchor::LEFT | Anchor::RIGHT)
            .layer(Layer::Top)
            .background_color(Color::rgb(0.1, 0.1, 0.15)),
        move || {
            container()
                .height(fill())
                .layout(
                    Flex::row()
                        .spacing(16.0)
                        .cross_alignment(CrossAlignment::Center),
                )
                .padding([0.0, 16.0])
                .child(text(move || format!("Count: {}", count.get())).color(Color::WHITE))
                .child(
                    container()
                        .background(Color::rgb(0.3, 0.3, 0.4))
                        .corner_radius(8.0)
                        .padding(8.0)
                        .hover_state(|s| s.lighter(0.1))
                        .pressed_state(|s| s.ripple())
                        .on_click(move || count.update(|c| *c += 1))
                        .child(text("Click me").color(Color::WHITE)),
                )
        },
    );
    app.run();
}

Building

# Build the library
cargo build

# Run the status bar example
cargo run --example status_bar

# Run the reactive example (demonstrates signals and events)
cargo run --example reactive_example

# Run the showcase (demonstrates various curvature options)
cargo run --example showcase

# Run the component example (demonstrates reusable components)
cargo run --example component_example

Examples

• status_bar - Basic status bar layout demonstration
• reactive_example - Interactive features with signals and state layers
• multi_surface - Multiple surfaces with shared reactive state
• surface_properties_example - Dynamic surface property modification (layer, keyboard interactivity)
• state_layer_example - Hover, pressed states, and ripple effects
• transform_example - Rotation, scale, and animated transforms
• animation_example - Spring and eased animations
• showcase - Corner curvature variations (squircle, circle, bevel, scoop)
• component_example - Reusable components with reactive props
• children_example - Dynamic lists with keyed reconciliation
• image_example - Raster and SVG images with content fit modes
• scroll_example - Scrollable containers with custom scrollbar styling
• scroll_mixed_content - Scrolling with text, text input, and images combined
• text_styling_example - Font families and weights for text styling
• service_example - Background services with automatic cleanup
• render_stats_test - Render performance debugging (requires --features render-stats)

Documentation

• Architecture Overview - System design and module structure
• State Layer API - Hover/pressed styles and ripple effects
• Transform System - Translate, rotate, scale with animations
• Reactive System - Signals, computed values, and effects
• Styling Guide - Colors, gradients, borders, and corners
• Image Widget - Displaying raster and SVG images

Requirements

• Rust 1.70+
• Wayland compositor with layer shell support (e.g., Sway, Hyprland)
• GPU with Vulkan or OpenGL support

License

MIT License - see LICENSE for details.