Struct Constraints 

pub struct Constraints {
    pub width: WidthSpec,
    pub height: HeightSpec,
}

Size constraints for layout computation.

Holds a WidthSpec and a HeightSpec for the two axes. Use the builder methods on Constraints to set individual bounds in a fluent style; the builders pick the appropriate variant for you.

Example

use slt::Constraints;

let c = Constraints::default().min_w(10).max_w(40);

Fields

width: WidthSpec

Width specification.

height: HeightSpec

Height specification.

Implementations

impl Constraints

pub const fn min_w(self, min_width: u32) -> Self

Set the minimum width constraint.

If the current variant is WidthSpec::MinMax, updates only the min side. Otherwise replaces the variant with MinMax { min: min_width, max: u32::MAX }.

pub const fn max_w(self, max_width: u32) -> Self

Set the maximum width constraint.

If the current variant is WidthSpec::MinMax, updates only the max side. Otherwise replaces the variant with MinMax { min: 0, max: max_width }.

pub const fn min_h(self, min_height: u32) -> Self

Set the minimum height constraint.

If the current variant is HeightSpec::MinMax, updates only the min side. Otherwise replaces the variant with MinMax { min: min_height, max: u32::MAX }.

pub const fn max_h(self, max_height: u32) -> Self

Set the maximum height constraint.

If the current variant is HeightSpec::MinMax, updates only the max side. Otherwise replaces the variant with MinMax { min: 0, max: max_height }.

pub const fn w_minmax(self, min: u32, max: u32) -> Self

Set min and max width together.

Equivalent to chaining min_w(min) and max_w(max) but in a single call, replacing the variant with WidthSpec::MinMax.

pub const fn h_minmax(self, min: u32, max: u32) -> Self

Set min and max height together.

pub const fn w(self, width: u32) -> Self

Set a fixed width (replaces any existing width spec).

pub const fn h(self, height: u32) -> Self

Set a fixed height (replaces any existing height spec).

pub const fn w_pct(self, pct: u8) -> Self

Set width as a percentage (0..=100) of the parent container.

pub const fn h_pct(self, pct: u8) -> Self

Set height as a percentage (0..=100) of the parent container.

pub const fn w_ratio(self, num: u16, den: u16) -> Self

Set width as an exact integer fraction of the parent (numerator, denominator).

w_ratio(1, 3) produces area / 3 — floor division. For area = 80, num = 1, den = 3 → 26.

pub const fn h_ratio(self, num: u16, den: u16) -> Self

Set height as an exact integer fraction of the parent (numerator, denominator).

h_ratio(1, 3) produces area / 3 — floor division.

pub const fn min_width(&self) -> Option<u32>

Minimum width derived from the current WidthSpec.

Returns Some(n) for WidthSpec::Fixed (both min and max are n) and for WidthSpec::MinMax when the min side is non-zero. Returns None for WidthSpec::Auto, WidthSpec::Pct, WidthSpec::Ratio, and for MinMax { min: 0, .. } (sentinel for “no minimum”).

pub const fn max_width(&self) -> Option<u32>

Maximum width derived from the current WidthSpec.

Returns Some(n) for WidthSpec::Fixed and for WidthSpec::MinMax when the max side is not the sentinel u32::MAX. Returns None otherwise.

pub const fn min_height(&self) -> Option<u32>

Minimum height derived from the current HeightSpec.

Mirror of min_width for the cross axis.

pub const fn max_height(&self) -> Option<u32>

Maximum height derived from the current HeightSpec.

Mirror of max_width for the cross axis.

pub const fn width_pct(&self) -> Option<u8>

Width percentage if the variant is WidthSpec::Pct.

pub const fn height_pct(&self) -> Option<u8>

Height percentage if the variant is HeightSpec::Pct.

pub fn set_min_width(&mut self, value: Option<u32>)

Set the minimum width as Option<u32>.

Promotes the variant to WidthSpec::MinMax preserving any existing max side. Passing None clears the minimum (sets it to 0); if the resulting MinMax has no effective bounds (min == 0 and max == u32::MAX) the variant collapses back to WidthSpec::Auto.

Prefer Constraints::min_w when you own the value; this setter is for in-place mutation through &mut Constraints.

pub fn set_max_width(&mut self, value: Option<u32>)

Set the maximum width as Option<u32>.

pub fn set_min_height(&mut self, value: Option<u32>)

Set the minimum height as Option<u32>.

pub fn set_max_height(&mut self, value: Option<u32>)

Set the maximum height as Option<u32>.

pub fn set_width_pct(&mut self, value: Option<u8>)

Set the width percentage as Option<u8>.

pub fn set_height_pct(&mut self, value: Option<u8>)

Set the height percentage as Option<u8>.

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

Formats the value using the given formatter.

impl Default for Constraints

fn default() -> Constraints

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Constraints

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Constraints

impl Hash for Constraints

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Constraints

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Constraints

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Constraints