Struct ObservableSink 

pub struct ObservableSink { /* private fields */ }

Adapts a binding expression to an observable subject: observers receive the values of the expression, and values pushed into the subject are written to the binding source.

This preserves the semantics of binding expressions as observed through an observable (mostly for unit tests), not necessarily those of an expression instantiated on an object. An expression may act either as an observable or as a binding on an object, not both.

Implementations

impl ObservableSink

pub fn create<E: UntypedBindingExpression>( expression: &Rc<E>, target: Option<&FerroObject>, ) -> Rc<ObservableSink>

Produces an observable which can be used to observe the value of expression. Panics if the expression is already instantiated on an object.

pub fn expression(&self) -> &Rc<dyn UntypedBindingExpression>

The expression behind the subject.

pub fn on_next(&self, value: Option<BoxedValue>)

Writes a value to the binding source.

Trait Implementations

impl IObservable<Option<Rc<dyn AnyValue>>> for ObservableSink

fn subscribe( &self, observer: Rc<dyn IObserver<Option<BoxedValue>>>, ) -> Rc<dyn IDisposable>

Subscribes observer; disposing the returned handle unsubscribes it.