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> Widget for ComponentWidget<C>

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.