Struct BoxConstraints 

pub struct BoxConstraints { /* private fields */ }

Immutable min/max size bounds passed down during layout.

Invariant: both min and max are non-negative and min <= max component-wise. This is enforced unconditionally by every constructor — there is no way to construct a BoxConstraints that violates it, so constrain can never panic.

Implementations

impl BoxConstraints

pub fn new(min: Size, max: Size) -> BoxConstraints

Construct constraints from explicit min/max bounds.

Both bounds are clamped to be non-negative. If max is smaller than min on either axis (an inverted/inconsistent input), max is widened up to min on that axis — min is authoritative — so the resulting constraints always satisfy min <= max. Inverted input usually indicates an upstream layout bug (e.g. padding subtraction underflow), so debug builds print a diagnostic when this correction fires; release builds correct silently.

pub fn tight(size: Size) -> BoxConstraints

Tight constraints that force an exact size (min == max == size).

pub fn loose(max: Size) -> BoxConstraints

Loose constraints allowing anything from zero up to max.

pub fn min(&self) -> Size

The minimum allowed size.

pub fn max(&self) -> Size

The maximum allowed size.

pub fn constrain(&self, size: Size) -> Size

Clamp size so it lies within [min, max] on both axes.

pub fn loosen(&self) -> BoxConstraints

Relax the minimum to zero, keeping the same maximum.

pub fn tighten(&self, size: Size) -> BoxConstraints

Return tight constraints at the size clamped into this range.

Useful when a parent wants to force a child to a specific size that still respects the incoming bounds.

pub fn is_tight(&self) -> bool

Whether the constraints force an exact size (min == max).

Trait Implementations

impl Clone for BoxConstraints

fn clone(&self) -> BoxConstraints

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for BoxConstraints

impl Debug for BoxConstraints

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl PartialEq for BoxConstraints

fn eq(&self, other: &BoxConstraints) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for BoxConstraints