Struct NullPainter 

pub struct NullPainter;

A no-op painter that discards all operations.

Used in headless mode (agent protocol, tests) where no visual output is needed but widgets still run their logic and register ontology.

Trait Implementations

impl Painter for NullPainter

fn fill_rect(&mut self, _rect: Rect, _color: Color, _corner_radius: f32)

Fill a rectangle with a solid color and optional corner rounding.

fn stroke_rect( &mut self, _rect: Rect, _color: Color, _width: f32, _corner_radius: f32, )

Stroke a rectangle outline.

fn fill_circle(&mut self, _center: Position, _radius: f32, _color: Color)

Fill a circle with a solid color.

fn stroke_circle( &mut self, _center: Position, _radius: f32, _color: Color, _width: f32, )

Stroke a circle outline.

fn line(&mut self, _from: Position, _to: Position, _color: Color, _width: f32)

Draw a line segment between two points.

fn text(&mut self, _pos: Position, _text: &str, _style: &TextStyle)

Draw text at a position using the given style.

fn measure_text(&self, text: &str, style: &TextStyle) -> Size

Measure how much space a text string would occupy without drawing it.

fn push_clip(&mut self, _rect: Rect)

Push a clipping rectangle. Drawing outside this rect is discarded.

fn pop_clip(&mut self)

Pop the most recent clipping rectangle.

fn fill_rect_gradient( &mut self, _rect: Rect, _gradient: &Gradient, _corner_radius: f32, )

Fill a rectangle with a gradient.

fn shadow_rect(&mut self, _rect: Rect, _shadow: &Shadow, _corner_radius: f32)

Draw a shadow behind a rectangle.

fn draw_image(&mut self, _handle: &ImageHandle, _rect: Rect)

Draw an image within the given rectangle.

fn stroke_rounded_rect( &mut self, rect: Rect, color: Color, width: f32, corner_radius: f32, bg_color: Color, )

Stroke a rounded rectangle with a known background color for proper inner cutout.

fn measure_text_mut(&mut self, text: &str, style: &TextStyle) -> Size

Measure text precisely (requires mutable access for font shaping).

fn draw_image_tinted(&mut self, handle: &ImageHandle, rect: Rect, _tint: Color)

Draw an image with optional tint color.