Module min_size 

MinSize — a layout modifier that ensures a child reaches a minimum width and/or height.

The child’s reported size is clamped upward so it never falls below the configured minimum on each constrained axis. A bounded proposal below the minimum is raised to it before it is forwarded, so that wrap-aware children (e.g. a multi-line TextWidget) measure against the width they will actually be placed into. An unbounded axis stays unbounded: the child answers with its ideal size, and the minimum applies to that answer, as SwiftUI’s .frame(minWidth:) does. Axes with no minimum set are passed through unchanged.

MinSize propagates the child’s flex and shrink weights so that a Spacer or Expand inside MinSize still participates in stack slack-distribution; the child’s own compression floor is composed with the MinSize floor.

For the inverse operation (capping a maximum size) see MaxSize.

Hit targets: take the floor from the theme

MinSize is the mechanism for a minimum hit box, but the number belongs to the active density rather than to the call site. Route it through density_min_size (or dp(.., TargetRole::Target, ..)), which raises the named axes to theme.input.target_size — 24 dp at Compact, 32 at Comfortable, 44 at Touch, and 48 under the Material 3 preset. That is what every shipped recipe does; see docs/density-and-targets.md.

// The density decides the floor; the call site only says "both axes".
let min = density_min_size(base, TargetAxes::BOTH, &tokens);
let _tap_target = MinSize::new(min.width, min.height)
    .child(IconWidget::checkmark(20.0));

A hard-coded literal is right only where the number is a design dimension that must not move with density. Where it is a target, name its bar: 24 dp is WCAG 2.2 SC 2.5.8 Target Size (Minimum), level AA — the floor min_target_conformance holds at every density; 44 dp is Apple’s HIG minimum and SC 2.5.5 Target Size (Enhanced), level AAA, which is what the Touch ladder aims for. 44 dp is never the AA figure.

Structs

MinSize

Layout modifier that enforces a minimum width and/or height on a single child widget.