Enum Dimension 

pub enum Dimension {
    Px(f32),
    Percent(f32),
    Em(f32),
    Rem(f32),
    Vw(f32),
    Vh(f32),
    Vmin(f32),
    Vmax(f32),
    Auto,
    MinContent,
    MaxContent,
    FitContent,
}

A length value that may be absolute, relative, or intrinsic.

This is the building block of the style system — widths, heights, margins, paddings, font sizes, and many other properties are all expressed as Dimension values that get resolved to concrete pixels during style resolution and layout.

Absolute values (Px) are ready to use immediately. Relative values (Percent, Em, Rem) need a reference value from the parent or root. Viewport values (Vw, Vh) need the viewport size. Intrinsic values (Auto, MinContent, etc.) are resolved by the layout algorithm itself.

Variants

Px(f32)

Absolute pixels (after DPI scaling).

Percent(f32)

Percentage of the parent’s corresponding dimension.

Em(f32)

Relative to the element’s computed font-size.

Rem(f32)

Relative to the root element’s computed font-size.

Vw(f32)

Percentage of the viewport width.

Vh(f32)

Percentage of the viewport height.

Vmin(f32)

The smaller of vw and vh.

Vmax(f32)

The larger of vw and vh.

Auto

Size determined by the layout algorithm.

MinContent

The smallest size that fits the content without overflow.

MaxContent

The largest size the content can fill without wrapping.

FitContent

Clamp between min-content and max-content, or the available space if it’s between those bounds.

Implementations

impl Dimension

pub fn is_auto(self) -> bool

pub fn is_definite(self) -> bool

True for any value that resolves to a concrete number (not auto/min-content/max-content/fit-content).

pub fn is_intrinsic(self) -> bool

True for values that the layout algorithm determines.

pub fn resolve(self, parent: f32) -> Option<f32>

Resolve an absolute or parent-relative value to pixels.

Only resolves Px and Percent. For font-relative and viewport-relative values, use resolve_full.

pub fn resolve_full(self, ctx: &ResolveContext) -> Option<f32>

Resolve with all context values available.

pub fn resolve_or(self, parent: f32, fallback: f32) -> f32

Resolve, falling back to a default for unresolvable values.

Trait Implementations

impl Clone for Dimension

fn clone(&self) -> Dimension

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Dimension

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

Formats the value using the given formatter.

impl Default for Dimension

fn default() -> Dimension

Returns the “default value” for a type.

impl PartialEq for Dimension

fn eq(&self, other: &Dimension) -> 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 Copy for Dimension

impl StructuralPartialEq for Dimension