Struct View 

pub struct View<'a, S>
where
    S: AppState,
{
    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 AppState 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

fn build(&self, _ctx: &mut BuildCtx<MyState>, view: &View<MyState>) -> Node {
    let name = &view.state.user_name;
    let theme = view.theme();
    Text::new(format!("Hello, {}!", name))
        .color(theme.tokens.colors.primary)
        .into_node()
}

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> View<'a, S>

where S: AppState,

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

pub fn theme(&self) -> &Theme

pub fn i18n(&self) -> &I18nRegistry

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

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

pub fn viewport_size(&self) -> LayoutSize

pub fn select<T>(&self) -> <T as Selector<S>>::Output

where T: Selector<S>,

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

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