Struct Constraints 

pub struct Constraints {
    pub min_width: f32,
    pub max_width: AxisBound,
    pub min_height: f32,
    pub max_height: AxisBound,
}

Layout constraints passed down the render tree during the measure pass.

See also the helper methods added in rosace-core:

• Constraints::max_width_f32
• Constraints::max_height_f32
• Constraints::constrain
• Constraints::is_tight Layout constraints passed down the render tree during the measure pass.

Distinct from rosace_trace::event::TraceConstraints, which is a simplified snapshot for tracing purposes only.

Fields

min_width: f32

Minimum allowed width in logical pixels.

max_width: AxisBound

Maximum allowed width.

min_height: f32

Minimum allowed height in logical pixels.

max_height: AxisBound

Maximum allowed height.

Implementations

impl Constraints

pub fn loose(width: f32, height: f32) -> Constraints

Loose constraints: minimum is zero, maximum is the given dimensions.

The child may be any size up to width × height.

pub fn tight(width: f32, height: f32) -> Constraints

Tight constraints: minimum equals maximum at the given dimensions.

The child must be exactly width × height.

pub fn unbounded() -> Constraints

Fully unbounded constraints: the child may take any size on both axes.

pub fn max_width_f32(&self) -> f32

Returns the maximum width as f32, or f32::INFINITY if the axis is unbounded or shrink-to-fit.

pub fn max_height_f32(&self) -> f32

Returns the maximum height as f32, or f32::INFINITY if the axis is unbounded or shrink-to-fit.

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

Clamp size so that it satisfies these constraints.

Width and height are each clamped to [min, max].

pub fn is_tight(&self) -> bool

Returns true when both axes are tightly bounded (min == max).

Trait Implementations

impl Clone for Constraints

fn clone(&self) -> Constraints

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Constraints

impl Debug for Constraints

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

Formats the value using the given formatter.

impl PartialEq for Constraints

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Constraints