Module expand 

Expand — a layout modifier that claims slack space in a stack and stretches its child to fill the allocated bounds.

Inside an HStack or VStack, Expand participates in the flex distribution pass by reporting a non-zero flex weight (default 1.0). The parent stack distributes leftover space proportionally to each child’s flex weight. Expand::new() competes on both axes; Expand::horizontal() and Expand::vertical() restrict competition to the named axis so they do not accidentally steal slack from orthogonal siblings. By default the wrapped child is stretched to the full allocated rectangle; call .align_child(alignment) to keep the child at its natural size and align it within the slot instead.

The default flex basis is zero (CSS flex-basis: 0), giving exact proportional ratios. Call .respect_intrinsic() to switch to auto basis where the child’s natural size acts as a floor before flex slack is added.

// Two panels sharing horizontal space in a 1:2 ratio
let _row = HStack::new()
    .child(Expand::new().flex(1.0).child(RectWidget::new()))
    .child(Expand::new().flex(2.0).child(RectWidget::new()));

Structs

Expand

Layout modifier that claims space along one or both axes from its parent and stretches its child to fill it.