Struct WindowOptions 

pub struct WindowOptions {
    pub size: (u32, u32),
    pub title: String,
    pub clear: Color,
    pub maximized: bool,
    pub frameless: bool,
    pub start_position: Option<(i32, i32)>,
    pub on_close_state: Option<Box<dyn FnOnce(WindowGeometry) + Send>>,
    pub menubar: Option<MenuModel>,
}

Everything a window backend needs to open the app’s window.

Fields

size: (u32, u32)

Initial window inner size in logical pixels.

title: String

Window title.

clear: Color

Background clear color (writes crate::render_world::Viewport::clear on init). See DEFAULT_CLEAR for the fallback this defaults to.

maximized: bool

Maximize the window on launch. Useful for full-bleed app demos.

frameless: bool

Suppress OS window chrome (title bar, borders, close/min/max buttons). Custom title bars and per-platform window drag must be implemented inside the app - see the <title-bar drag> region (TODO S31).

start_position: Option<(i32, i32)>

Initial outer position in physical pixels. None lets the OS place the window (the default). Wired up so callers can restore the last-known window position from disk (P1.3).

on_close_state: Option<Box<dyn FnOnce(WindowGeometry) + Send>>

Callback invoked once per close with the current window position, inner size (logical), and maximized flag. None (the default) disables state persistence. Implementations typically serialise to disk via lumenc::window_state::save.

menubar: Option<MenuModel>

Optional native menu bar spec. Built by the embedder from the markup <menubar> element. None = no menu bar.

Trait Implementations

impl Default for WindowOptions

fn default() -> Self

Returns the “default value” for a type.