astrelis-ui 0.2.4

Astrelis UI - Taffy-based UI system with WGPU rendering

This crate provides a flexible UI system built on Taffy layout engine:

• Declarative widget API
• Flexbox and Grid layouts via Taffy
• GPU-accelerated rendering
• Event handling system
• Composable widget tree

Quick Start

# use astrelis_ui::UiSystem;
# use astrelis_render::{Color, GraphicsContext};
# let graphics_context = GraphicsContext::new_owned_sync().expect("Failed to create graphics context");
let mut ui = UiSystem::new(graphics_context);

ui.build(|root| {
    root.container()
        .width(800.0)
        .height(600.0)
        .padding(20.0)
        .child(|container| {
            container.text("Hello, World!")
                .size(24.0)
                .color(Color::WHITE)
                .build();
            container.button("Click Me").build();
            container.container().build()
        })
        .build();
});

// In render loop:
// ui.update(delta_time);
// ui.handle_events(&mut event_batch);
// ui.render(&mut render_pass, viewport_size);

API Conventions

This crate follows consistent method naming conventions:

Mutation Methods

• set_*() - Full replacement that may trigger complete rebuild/re-layout
  • Example: set_text() replaces text and triggers text shaping
• update_*() - Incremental update optimized with dirty flags
  • Example: update_text() only marks TEXT_SHAPING dirty, skipping layout
• add_*() - Append to a collection
  • Example: add_widget() appends to widget tree

Accessor Methods

• get_*() - Returns Option<&T> for possibly-missing values
  • Example: get_widget(id) returns Option<&Widget>
• *() (no prefix) - Returns &T, panics if unavailable (use when required)
  • Example: widget(id) returns &Widget or panics
• try_*() - Fallible operation returning Result
  • Example: try_layout() returns Result<(), LayoutError>
• has_*() - Boolean check for existence
  • Example: has_widget(id) returns bool

Computation Methods

• compute_*() - Expensive computation (results often cached)
  • Example: compute_layout() runs Taffy layout solver
• calculate_*() - Mathematical calculation
  • Example: calculate_bounds() computes widget bounds

Builder Methods

• with_*(value) - Builder method returning Self for chaining
  • Example: with_padding(20.0) sets padding and returns builder
• build() - Finalizes builder and consumes it
  • Example: widget.build() adds widget to tree