Struct View 

pub struct View<'a, S: GlobalState> {
    pub state: &'a S,
    pub runtime: &'a RuntimeState,
    pub env: &'a Env,
    pub layout: Option<&'a LayoutSnapshot>,
}

Read-only access to application state and environment during widget building.

View is the primary way widgets read data. It is parameterised over the concrete GlobalState type S, giving type-safe access to state while also exposing the theme, i18n registry, layout snapshot from the previous frame, and animation values.

Example

let name = &view.state().user_name;
let theme = view.theme();

Fields

state: &'a S

Reference to the current application state.

runtime: &'a RuntimeState

Runtime interaction, scroll, text-edit, and animation state.

env: &'a Env

Environment (theme, i18n, viewport size, locale).

layout: Option<&'a LayoutSnapshot>

Layout snapshot from the previous frame, if available.

Implementations

impl<'a, S: GlobalState> View<'a, S>

pub fn new( state: &'a S, runtime: &'a RuntimeState, env: &'a Env, layout: Option<&'a LayoutSnapshot>, ) -> Self

pub fn state(&self) -> &S

pub fn runtime(&self) -> &RuntimeState

pub fn env(&self) -> &Env

pub fn layout(&self) -> Option<&LayoutSnapshot>

pub fn theme(&self) -> &Theme

pub fn i18n(&self) -> &I18nRegistry

pub fn get_rect(&self, id: WidgetId) -> Option<LayoutRect>

pub fn get_constraints(&self, id: WidgetId) -> Option<BoxConstraints>

pub fn viewport_size(&self) -> LayoutSize

pub fn select<R>(&self, selector: impl FnOnce(&S) -> R) -> R

pub fn animation_value( &self, widget_id: WidgetId, property: &AnimationPropertyId, ) -> f32

pub fn video_state(&self, widget_id: WidgetId) -> Option<&VideoState>