Struct Environment 

pub struct Environment {
    pub theme: Theme,
    pub layout_direction: LayoutDirection,
    pub scale_factor: f32,
    pub prefers_high_contrast: bool,
    pub prefers_reduced_motion: bool,
    pub prefers_large_text: bool,
    pub prefers_touch: Option<bool>,
    pub screen_reader: ScreenReaderState,
    pub explore_by_touch: ExploreByTouch,
}

Environment data that flows down the widget tree. Subtrees can override parts of the environment.

Fields

theme: Theme

layout_direction: LayoutDirection

scale_factor: f32

prefers_high_contrast: bool

prefers_reduced_motion: bool

prefers_large_text: bool

prefers_touch: Option<bool>

The OS’s stated preference for a touch-first UI (Windows tablet mode, a convertible in slate posture), or None when the platform does not report one.

Nothing writes it and nothing reads it yet: it is the input to a density policy the framework does not act on — see WidgetTree::set_density_policy.

screen_reader: ScreenReaderState

Whether an assistive technology is attached. See ScreenReaderState.

explore_by_touch: ExploreByTouch

Whether the platform’s touch-exploration mode is on. See ExploreByTouch.

Implementations

impl Environment

pub fn new(theme: Theme) -> Self

pub fn with_theme_override(&self, f: &dyn Fn(&mut Theme)) -> Self

Apply a theme override function, returning a new Environment with the modified theme while preserving all other fields.

Trait Implementations

impl Clone for Environment

fn clone(&self) -> Environment

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Environment

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

Formats the value using the given formatter.

impl Default for Environment

fn default() -> Self

Returns the “default value” for a type.