Struct ComponentWidget 

pub struct ComponentWidget<C: Component> { /* private fields */ }

The retained widget behind a ComponentView.

Owns the component’s local State, the previous child AnyView (diffed each rebuild), the child element wrapped in a ChildPod, the component’s reactive Owner, and a component-local BuildCtx id counter.

The child element is stored double-boxed inside the pod (ChildPod::new( Box::new(element)), where element: Box<dyn Widget> is the AnyView’s element): the extra box lets a rebuild recover the child as &mut Box<dyn Widget>, the exact type AnyView::rebuild needs to swap the widget on a concrete-type change. This mirrors frust-widgets’ build_child/rebuild_child pod convention.

Under the hotpatch feature

The struct is repr(C), starts with the [SeamWitness] the creating image wrote, and holds the state boxed, so every field sits at the same offset in every image whatever C::State looks like there. rebuild, teardown and Drop check the witness first; on a mismatch nothing C-generic touches the state, and Drop leaks the state box (mem::forget) rather than let another image’s layout drop or free it, while still disposing the owner.

Trait Implementations

impl<C: Component> Drop for ComponentWidget<C>

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl<C: Component> SliverWidget for ComponentWidget<C>

fn layout_sliver( &mut self, ctx: &mut LayoutCtx<'_>, sc: &SliverConstraints, ) -> SliverGeometry

Pass-through, like Widget::layout: the child sits at the component’s origin and receives sc unchanged, under the child pod’s layout skip.

impl<C: Component> Widget for ComponentWidget<C>

fn as_sliver(&mut self) -> Option<&mut dyn SliverWidget>

A component is a sliver exactly when its child is: the boundary is as transparent to the sliver protocol as it is to box layout. The sliver face is the component itself rather than the child widget, so the layout runs through the child pod and leaves it sized and recorded for this component’s own paint, hit test and semantics.

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

Choose a size within bc and return it. The chosen size must satisfy bc (callers may additionally clamp via BoxConstraints::constrain).

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

Emit draw commands for this widget into scene.

fn semantics(&self, ctx: &mut SemanticsCtx)

Contribute this widget’s accessibility node(s) into ctx.

fn visit_children(&self, visitor: &mut dyn FnMut(&ChildPod))

Visit this widget’s owned ChildPods, in declaration (paint) order — the read-only seam that makes the retained hierarchy enumerable.

fn event(&mut self, ctx: &mut EventCtx<'_>, event: &InputEvent) -> EventResult

Handle an input event, optionally mutating application state through ctx and reporting whether it was consumed.

fn type_name(&self) -> &'static str

This widget’s concrete type name, for read-only tooling.