Enum EnvVariable 

pub enum EnvVariable {
    SafeAreaInsetTop,
    SafeAreaInsetRight,
    SafeAreaInsetBottom,
    SafeAreaInsetLeft,
    KeyboardInsetHeight,
}

A CSS env() variable name the engine can supply a value for.

env() is the value-side twin of the dynamic selectors: a selector asks “does this rule apply under the window’s context?”, an env() asks “what is this length under the window’s context?”. Both read DynamicSelectorContext, both are (re)resolved in the author cascade whenever the context changes, and neither needs its own invalidation.

Parsed by parser2 into a CssDeclaration::Dynamic whose dynamic_id is "env:<name>" (see ENV_DYNAMIC_ID_PREFIX) and whose default_value is the parsed fallback; CssDeclaration::resolve_in_cascade turns that into a concrete property against the live context. Not a C-ABI type: it never leaves the css/core crates.

Variants

SafeAreaInsetTop

SafeAreaInsetRight

SafeAreaInsetBottom

SafeAreaInsetLeft

KeyboardInsetHeight

The VirtualKeyboard API’s env(keyboard-inset-height).

Implementations

impl EnvVariable

pub const ALL: [Self; 5]

pub const fn as_css_name(&self) -> &'static str

The name as written inside env(...).

pub fn from_css_name(name: &str) -> Option<Self>

Parse the name written inside env(...); None for a name the engine does not define (the CSS “unknown environment variable” case, where only the fallback can apply).

pub fn dynamic_id(&self) -> AzString

The dynamic_id an env() declaration is stored under.

pub fn from_dynamic_id(id: &str) -> Option<Self>

Recover the variable from a dynamic_id; None for a plain var() id (no prefix) or a prefixed name this build does not know.

pub fn resolve(&self, ctx: &DynamicSelectorContext) -> Option<f32>

The variable’s value under ctx, in logical px; None when the platform reported nothing for it (the context’s NaN sentinel), in which case the env() fallback applies.

Trait Implementations

impl Clone for EnvVariable

fn clone(&self) -> EnvVariable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for EnvVariable

impl Debug for EnvVariable

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

Formats the value using the given formatter.

impl Eq for EnvVariable

impl Hash for EnvVariable

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 EnvVariable

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EnvVariable