Struct AppBar 

pub struct AppBar {
    pub title: String,
    pub title_size: f32,
    pub background: Color,
    pub foreground: Color,
    pub border_color: Color,
    pub leading: Option<BoxedWidget>,
    pub actions: Vec<BoxedWidget>,
    /* private fields */
}

A top app bar with title, leading, and trailing action slots.

Platform-adaptive (D105 Phase 23): height, show_traffic_lights, and title alignment default to the active theme’s app_bar style (ThemeData::app_bar, an rosace_theme::AppBarStyle) — the SAME widget renders macOS/iOS/Android-appropriate chrome purely from theme data, no platform branch in this file. Per-instance builder calls (.height(..), .traffic_lights()) override the theme for that one instance; a widget that doesn’t call them follows the theme.

Fields

title: String

title_size: f32

background: Color

foreground: Color

border_color: Color

leading: Option<BoxedWidget>

actions: Vec<BoxedWidget>

Implementations

impl AppBar

pub fn new(title: impl Into<String>) -> Self

pub fn background(self, c: Color) -> Self

pub fn foreground(self, c: Color) -> Self

pub fn height(self, h: f32) -> Self

Overrides the active theme’s app-bar height for this instance.

pub fn leading(self, w: impl Widget + 'static) -> Self

pub fn action(self, w: impl Widget + 'static) -> Self

pub fn no_traffic_lights(self) -> Self

Overrides the active theme’s traffic-light setting for this instance.

pub fn traffic_lights(self) -> Self

Draw faux macOS traffic-light dots (only for standalone mockup screenshots — a real app window already has real OS traffic lights). Overrides the active theme’s traffic-light setting for this instance.

pub fn title_size(self, s: f32) -> Self

pub fn material(self, m: ShaderMaterial) -> Self

Per-instance shader material — replaces the bar fill when resolved. Beats the theme’s AppBarMaterial default (D124 Step 5).

Trait Implementations

impl Widget for AppBar

fn layout(&self, ctx: &LayoutCtx<'_>) -> Size

Measure under ctx.constraints and return a size within them.

fn paint(&self, ctx: &mut PaintCtx<'_>)

Record draw commands for ctx.rect.

fn children(&self) -> Children<'_>

Declare this widget’s children. Drives every default below.

fn flex_factor(&self) -> f32

Flex weight inside Row/Column. Wrappers are transparent by default.

fn into_element(self) -> Element

where Self: Sized + 'static,

Wrap this widget in an Element so it can be returned from Component::build().