Trait Widget

Source

pub trait Widget<C, M>where
    C: PixelColor,
    M: Clone,{
Show 16 methods    // Required methods
    fn measure(&mut self, constraints: Constraints) -> Size;
    fn arrange(&mut self, rect: Rectangle);
    fn rect(&self) -> Rectangle;
    fn handle_touch(&mut self, point: Point, phase: TouchPhase) -> Option<M>;
    fn draw<'t>(
        &self,
        renderer: &mut dyn Renderer<C>,
        theme: &Theme<'t, C>,
    ) -> Result<(), RenderError>;

    // Provided methods
    fn preferred_size(&self) -> (Length, Length) { ... }
    fn mark_pressed(&mut self, point: Point) { ... }
    fn widget_id(&self) -> Option<WidgetId> { ... }
    fn is_focusable(&self) -> bool { ... }
    fn collect_focusable(&self, out: &mut Vec<WidgetId>) { ... }
    fn sync_focus(&mut self, focused: Option<WidgetId>) { ... }
    fn handle_action(&mut self, action: UiAction) -> Option<M> { ... }
    fn route_action(&mut self, target: WidgetId, action: UiAction) -> Option<M> { ... }
    fn navigate_focus(
        &self,
        target: WidgetId,
        action: UiAction,
    ) -> Option<WidgetId> { ... }
    fn focus_rect(&self, target: WidgetId) -> Option<Rectangle> { ... }
    fn focus_at(&self, point: Point) -> Option<WidgetId> { ... }
}

Expand description

Object-safe widget contract.

Required Methods§

Source

fn measure(&mut self, constraints: Constraints) -> Size

Report the size this widget wants within constraints.

Source

fn arrange(&mut self, rect: Rectangle)

Commit the final rectangle, recursively arranging any children.

Source

fn rect(&self) -> Rectangle

The current arranged rectangle.

Source

fn handle_touch(&mut self, point: Point, phase: TouchPhase) -> Option<M>

Dispatch a touch event. Returns a message if consumed.

Source

fn draw<'t>( &self, renderer: &mut dyn Renderer<C>, theme: &Theme<'t, C>, ) -> Result<(), RenderError>

Paint into renderer at rect.

Provided Methods§

Source

fn preferred_size(&self) -> (Length, Length)

Per-axis sizing intent set via .width(...) / .height(...). Containers consult this during layout to allocate fixed slots, query intrinsic sizes, and split residual space among Fill / FillPortion children. Default is Length::Fill on both axes.

Source