Enum EitherOf4Widget 

pub enum EitherOf4Widget<A, B, C, D> {
    A(A),
    B(B),
    C(C),
    D(D),
}

Retained widget for EitherOf4: the live arm’s widget, delegated to for every pass.

Variants

A(A)

Arm A’s widget.

B(B)

Arm B’s widget.

C(C)

Arm C’s widget.

D(D)

Arm D’s widget.

Trait Implementations

impl<A, B, C, D> Widget for EitherOf4Widget<A, B, C, D>

where A: Widget, B: Widget, C: Widget, D: Widget,

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

Report the live arm’s name: the enum is a storage detail, never a tree element in its own right.

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

The live arm’s sliver face, forwarded as for EitherWidget.

fn is_focusable(&self) -> bool

The live arm’s answer, forwarded as for EitherWidget.

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

The live arm’s traversal children, forwarded as for EitherWidget.

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

Choose a size within bc and return it. Under a render root the call may be skipped (see ChildPod::layout_child), so the result must depend only on bc, the context’s globals and state changed through a pod-dirtying channel: a LAYOUT rebuild, request_layout, an unpaced frame request, or a handled / redraw-requesting event.

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

Emit draw commands into scene. Paint may advance animation state; it must then call PaintCtx::request_frame until the animation rests.

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

Handle an input event and report whether it was consumed; defaults to EventResult::Ignored. Containers forward via ChildPod::event_child.

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

Contribute accessibility node(s) after layout; defaults to none. A container forwards via ChildPod::semantics_child.

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

Visit this widget’s owned ChildPods in paint order, for read-only tooling; defaults to none and must not mutate pass state.