Struct CssMockEnvironment 

#[repr(C)]
pub struct CssMockEnvironment {
    pub theme: OptionThemeCondition,
    pub language: OptionString,
    pub os_version: OptionOsVersion,
    pub os: OptionOsCondition,
    pub desktop_env: OptionLinuxDesktopEnv,
    pub viewport_width: OptionF32,
    pub viewport_height: OptionF32,
    pub prefers_reduced_motion: OptionBool,
    pub prefers_high_contrast: OptionBool,
}

Mock environment for CSS evaluation.

Allows overriding auto-detected system properties for testing and development. Any field set to None will use the auto-detected value. Any field set to Some(...) will override the auto-detected value.

Example

use azul_css::dynamic_selector::{
    OsCondition, ThemeCondition, OsVersion,
    OptionOsCondition, OptionThemeCondition, OptionOsVersion,
};
 
// Mock a Linux dark theme environment on any platform
let mock = CssMockEnvironment {
    os: OptionOsCondition::Some(OsCondition::Linux),
    theme: OptionThemeCondition::Some(ThemeCondition::Dark),
    ..Default::default()
};
 
// Mock Windows XP for retro testing
let mock = CssMockEnvironment {
    os: OptionOsCondition::Some(OsCondition::Windows),
    os_version: OptionOsVersion::Some(OsVersion::WIN_XP),
    ..Default::default()
};

Fields

theme: OptionThemeCondition

Override the current theme (light/dark)

language: OptionString

Override the current language (BCP 47 tag, e.g., “de-DE”, “en-US”)

os_version: OptionOsVersion

Override the detected OS version

os: OptionOsCondition

Override the detected operating system

desktop_env: OptionLinuxDesktopEnv

Override the Linux desktop environment (only applies when os = Linux)

viewport_width: OptionF32

Override viewport dimensions (for @media queries) Only use for testing - normally set by window size

viewport_height: OptionF32

prefers_reduced_motion: OptionBool

Override the reduced motion preference

prefers_high_contrast: OptionBool

Override the high contrast preference

Implementations

impl CssMockEnvironment

pub fn linux() -> Self

Create a mock for Linux environment

pub fn windows() -> Self

Create a mock for Windows environment

pub fn macos() -> Self

Create a mock for macOS environment

pub fn dark_theme() -> Self

Create a mock for dark theme

pub fn light_theme() -> Self

Create a mock for light theme

pub fn apply_to(&self, ctx: &mut DynamicSelectorContext)

Apply this mock to a DynamicSelectorContext

Trait Implementations

impl Clone for CssMockEnvironment

fn clone(&self) -> CssMockEnvironment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CssMockEnvironment

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

Formats the value using the given formatter.

impl Default for CssMockEnvironment

fn default() -> CssMockEnvironment

Returns the “default value” for a type.