Enum Length 

pub enum Length {
    Px(f32),
    String(String),
}

A pure CSS length, no percentage allowed (e.g. font-size, box-shadow).

Variants

Px(f32)

Bare number, treated as pixels.

String(String)

String form: "24px", "1.5em", "100vw", "0".

Implementations

impl Length

pub fn parse(&self) -> ParsedLength

Parse into a resolved unit. Falls back to Px(0.0) on unparseable input, for the many existing call sites across the codebase that expect an infallible result — but unlike the previous behaviour, this now logs a warning so the fallback is a detectable signal instead of a silent, indistinguishable zero. Callers that can surface the failure themselves (e.g. a validator) should prefer Length::try_parse, which returns None instead of guessing.

pub fn try_parse(&self) -> Option<ParsedLength>

Fallible counterpart of Length::parse: None on unparseable input rather than a silent Px(0.0), and never logs. Prefer this when the failure can be reported to the caller (e.g. schema validation) instead of swallowed.

pub fn resolve(&self, ctx: &LengthContext) -> f32

pub fn px(&self) -> f32

Quick px resolution without context (treats em/rem/%/vw/vh as 0). Used by painters that only need the px value of an explicit length and have no LengthContext available (see [CssStyle::font_size_px_or] / letter_spacing_px / line_height_for in css::style, all built on this — issue #125 §2).

A relative unit here cannot be resolved correctly no matter what: em/rem need a font-size base, vw/vh need the real viewport, % needs a parent box — none of which this context-free accessor has. Rather than silently returning 0.0 indistinguishably from a deliberate 0px (the previous behaviour — the “15.6vw renders a completely black frame with no signal” bug), this now warns loudly when the dropped value was a relative unit, same fail-loud contract as [parse_length_or_warn] uses for genuinely unparseable input. Callers with a real LengthContext should call Length::resolve instead, which resolves these correctly.

Trait Implementations

impl Clone for Length

fn clone(&self) -> Length

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Length

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

Formats the value using the given formatter.

impl Default for Length

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Length

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for Length

fn schema_name() -> String

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn is_referenceable() -> bool

Whether JSON Schemas generated for this type should be re-used where possible using the $ref keyword.

impl PartialEq for Length

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Length

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 Length