Struct WidgetApp 

pub struct WidgetApp {
    pub width: u32,
    pub height: u32,
    pub font: FontCache,
    pub theme: ThemeData,
    /* private fields */
}

Off-screen widget renderer — renders a widget tree to a SkiaCanvas or PNG bytes.

Use this for golden / snapshot tests: render a widget to PNG, save it, and compare future runs byte-for-byte to catch visual regressions.

For a real windowed app, use rosace::App from the umbrella crate instead.

// Render to PNG bytes (dark theme by default):
let png = WidgetApp::new(800, 600).render_png(&root);

// Light theme:
let png = WidgetApp::new(800, 600).light().render_png(&root);

// Custom theme:
let png = WidgetApp::new(800, 600).theme(my_theme).render_png(&root);

Fields

width: u32

height: u32

font: FontCache

theme: ThemeData

Implementations

impl WidgetApp

pub fn new(width: u32, height: u32) -> Self

Create a new app with the default dark theme.

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

Override the background color explicitly (ignores theme background).

pub fn with_font(self, f: FontCache) -> Self

Replace the font.

pub fn theme(self, t: ThemeData) -> Self

Set a fully custom theme.

pub fn dark(self) -> Self

Use the built-in dark theme (this is already the default).

pub fn light(self) -> Self

Use the built-in light theme.

pub fn render(&self, root: &dyn Widget) -> SkiaCanvas

Render the widget tree to a SkiaCanvas.

pub fn render_into(&self, canvas: &mut SkiaCanvas, root: &dyn Widget)

Paint the widget tree onto an existing canvas (for windowed apps).

pub fn render_png(&self, root: &dyn Widget) -> Vec<u8>

Render and encode to PNG bytes (convenience).