Struct titanium::desktop::gui::libdruid::widget::Maybe

pub struct Maybe<T> { /* private fields */ }

A widget that switches between two possible child views, for Data that is Option<T>.

Implementations

impl<T> Maybe<T>where T: Data,

pub fn new<W1, W2>( some_maker: impl Fn() -> W1 + 'static, none_maker: impl Fn() -> W2 + 'static ) -> Maybe<T>where W1: Widget<T> + 'static, W2: Widget<()> + 'static,

Create a new Maybe widget with a Some and a None branch.

pub fn or_empty<W1>(some_maker: impl Fn() -> W1 + 'static) -> Maybe<T>where W1: Widget<T> + 'static,

Create a new Maybe widget where the None branch is an empty widget.

Trait Implementations

impl<T> Widget<Option<T>> for Maybe<T>where T: Data,

fn event( &mut self, ctx: &mut EventCtx<'_, '_>, event: &Event, data: &mut Option<T>, env: &Env )

Handle an event.

fn lifecycle( &mut self, ctx: &mut LifeCycleCtx<'_, '_>, event: &LifeCycle, data: &Option<T>, env: &Env )

Handle a life cycle notification.

fn update( &mut self, ctx: &mut UpdateCtx<'_, '_>, old_data: &Option<T>, data: &Option<T>, env: &Env )

Update the widget’s appearance in response to a change in the app’s Data or Env.

fn layout( &mut self, ctx: &mut LayoutCtx<'_, '_>, bc: &BoxConstraints, data: &Option<T>, env: &Env ) -> Size

Compute layout.

fn paint(&mut self, ctx: &mut PaintCtx<'_, '_, '_>, data: &Option<T>, env: &Env)

Paint the widget appearance.

fn compute_max_intrinsic( &mut self, axis: Axis, ctx: &mut LayoutCtx<'_, '_>, bc: &BoxConstraints, data: &T, env: &Env ) -> f64

Computes max intrinsic/preferred dimension of a widget on the provided axis.