Struct Lazy 

pub struct Lazy<'a, Message, Theme, Renderer, Dependency, View> { /* private fields */ }

A widget that only rebuilds its contents when necessary.

Implementations

impl<'a, Message, Theme, Renderer, Dependency, View> Lazy<'a, Message, Theme, Renderer, Dependency, View>

where Dependency: Hash + 'a, View: Into<Element<'static, Message, Theme, Renderer>>,

pub fn new( dependency: Dependency, view: impl Fn(&Dependency) -> View + 'a, ) -> Self

Available on crate feature lazy only.

Creates a new Lazy widget with the given data Dependency and a closure that can turn this data into a widget tree.

Trait Implementations

impl<'a, Message, Theme, Renderer, Dependency, View> From<Lazy<'a, Message, Theme, Renderer, Dependency, View>> for Element<'a, Message, Theme, Renderer>

where View: Into<Element<'static, Message, Theme, Renderer>> + 'static, Renderer: Renderer + 'static, Message: 'static, Theme: 'static, Dependency: Hash + 'a,

Available on crate feature lazy only.

fn from(lazy: Lazy<'a, Message, Theme, Renderer, Dependency, View>) -> Self

Converts to this type from the input type.

impl<'a, Message, Theme, Renderer, Dependency, View> Widget<Message, Theme, Renderer> for Lazy<'a, Message, Theme, Renderer, Dependency, View>

where View: Into<Element<'static, Message, Theme, Renderer>> + 'static, Dependency: Hash + 'a, Message: 'static, Theme: 'static, Renderer: Renderer + 'static,

Available on crate feature lazy only.

fn tag(&self) -> Tag

Returns the Tag of the Widget.

fn state(&self) -> State

Returns the State of the Widget.

fn children(&self) -> Vec<Tree>

Returns the state Tree of the children of the Widget.

fn diff(&self, tree: &mut Tree)

Reconciles the Widget with the provided Tree.

fn size(&self) -> Size<Length>

Returns the Size of the Widget in lengths.

fn size_hint(&self) -> Size<Length>

Returns a Size hint for laying out the Widget.

fn layout( &mut self, tree: &mut Tree, renderer: &Renderer, limits: &Limits, ) -> Node

Returns the layout::Node of the Widget.

fn operate( &mut self, tree: &mut Tree, layout: Layout<'_>, renderer: &Renderer, operation: &mut dyn Operation, )

Applies an Operation to the Widget.

fn update( &mut self, tree: &mut Tree, event: &Event, layout: Layout<'_>, cursor: Cursor, renderer: &Renderer, shell: &mut Shell<'_, Message>, viewport: &Rectangle, )

Processes a runtime Event.

fn mouse_interaction( &self, tree: &Tree, layout: Layout<'_>, cursor: Cursor, viewport: &Rectangle, renderer: &Renderer, ) -> Interaction

Returns the current mouse::Interaction of the Widget.

fn draw( &self, tree: &Tree, renderer: &mut Renderer, theme: &Theme, style: &Style, layout: Layout<'_>, cursor: Cursor, viewport: &Rectangle, )

Draws the Widget using the associated Renderer.

fn overlay<'b>( &'b mut self, tree: &'b mut Tree, layout: Layout<'b>, renderer: &Renderer, viewport: &Rectangle, translation: Vector, ) -> Option<Element<'b, Message, Theme, Renderer>>

Returns the overlay of the Widget, if there is any.