Struct Css 

pub struct Css { /* private fields */ }

Represents a CSS class with a name, its style declarations, and optional pseudo rules.

Created by the class! macro and used in html! via the class: attribute. When the renderer encounters a Css, it injects the styles into the DOM’s <style> element on first use and applies the class name to the element.

Implementations

impl Css

Implementation of Css construction and style injection.

pub fn parse_pseudo_rules(input: &str) -> Vec<PseudoRule>

Parses pseudo-class/pseudo-element rules from a compact serialization string.

The serialization format is: :selector { key: value; key: value; }:another { ... } This is used by the class! macro for fully static class definitions where pseudo rules can be computed at compile time.

Arguments

• &str - The serialized pseudo rules string.

Returns

• Vec<PseudoRule> - The parsed pseudo rules.

pub fn parse_media_rules(input: &str) -> Vec<MediaRule>

Parses media query rules from a compact serialization string.

The serialization format is: @media query { key: value; key: value; }@media query2 { ... } This is used by the class! macro for fully static class definitions where media rules can be computed at compile time.

Arguments

• &str - The serialized media rules string.

Returns

• Vec<MediaRule> - The parsed media rules.

pub fn inject_style(&self)

Injects this class’s styles into the DOM if not already present.

Uses a global HashSet to track injected class names, avoiding the expensive existing_css.contains(css) full-text search on every call. Builds the class rule, pseudo-class rules, and media rules as CSS text, then appends them directly to the <style> element via append_child with a new text node — no read-modify-write of the entire stylesheet content.

Panics

Panics if window() or document() is unavailable on the current platform.

pub fn inject_css(css_text: &str)

Injects CSS text into the shared <style> element in the DOM.

Delegates to Css::append_css for the actual DOM append. Unlike the previous implementation, this does not read the existing stylesheet content or perform a full-text contains search.

Arguments

• &str - The CSS text to inject (e.g., reset styles, keyframes, media queries).

Panics

Panics if window() or document() is unavailable on the current platform.

impl Css

pub fn get_name(&self) -> &String

pub fn get_mut_name(&mut self) -> &mut String

pub fn set_name(&mut self, val: String) -> &mut Self

pub fn get_style(&self) -> &String

pub fn get_mut_style(&mut self) -> &mut String

pub fn set_style(&mut self, val: String) -> &mut Self

pub fn get_pseudo_rules(&self) -> &Vec<PseudoRule>

pub fn get_mut_pseudo_rules(&mut self) -> &mut Vec<PseudoRule>

pub fn set_pseudo_rules(&mut self, val: Vec<PseudoRule>) -> &mut Self

pub fn get_media_rules(&self) -> &Vec<MediaRule>

pub fn get_mut_media_rules(&mut self) -> &mut Vec<MediaRule>

pub fn set_media_rules(&mut self, val: Vec<MediaRule>) -> &mut Self

impl Css

pub fn new( name: String, style: String, pseudo_rules: Vec<PseudoRule>, media_rules: Vec<MediaRule>, ) -> Self

Trait Implementations

impl Clone for Css

fn clone(&self) -> Css

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Css

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

Formats the value using the given formatter.

impl Default for Css

fn default() -> Css

Returns the “default value” for a type.

impl Display for Css

Displays the CSS class name.

This enables format!("{}", css) to produce the class name string, which is required for reactive if conditions in class: attributes.

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

Formats the CSS class as its name string.

Arguments

• &mut Formatter - The formatter.

Returns

• fmt::Result - The formatting result.

impl IntoReactiveString for &'static Css

Converts a reference to a Css into its class name for reactive string storage.

fn into_reactive_string(self) -> String

Returns the class name as an owned string.

Returns

• String - The class name.

impl IntoReactiveString for Css

Converts a Css into its class name for reactive string storage.

fn into_reactive_string(self) -> String

Returns the class name as an owned string.

Returns

• String - The class name.

impl IntoReactiveValue for &'static Css

Converts a reference to a CSS class into an attribute value by cloning.

fn into_reactive_value(self) -> AttributeValue

Converts this CSS class reference into an AttributeValue::Css by cloning.

Returns

• AttributeValue - A CSS class attribute value.

impl IntoReactiveValue for Css

Converts a CSS class reference into an attribute value.

fn into_reactive_value(self) -> AttributeValue

Converts this CSS class into an AttributeValue::Css.

Returns

• AttributeValue - A CSS class attribute value.

impl PartialEq for Css

Visual equality comparison for CSS classes.

Two CSS classes are considered equal when their class names match, since the name uniquely identifies the visual style rule.

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

Compares two CSS classes by name.

Arguments

• &Self - The first CSS class.
• &Self - The second CSS class.

Returns

• bool - true if the class names match.

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

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