Airstream/com.raquo.airstream.core/WritableSignal

WritableSignal

trait WritableSignal[A] extends Signal[A] with WritableObservable[A]
trait Signal[A]
trait SignalSource[A]
trait Observable[A]
trait Named
trait Source[A]
class Object
trait Matchable
class Any
class CombineSignalN[A, Out]
class CombineSignal2[T1, T2, Out]
class CombineSignal3[T1, T2, T3, Out]
class CombineSignal4[T1, T2, T3, T4, Out]
class CombineSignal5[T1, T2, T3, T4, T5, Out]
class CombineSignal6[T1, T2, T3, T4, T5, T6, Out]
class CombineSignal7[T1, T2, T3, T4, T5, T6, T7, Out]
class CombineSignal8[T1, T2, T3, T4, T5, T6, T7, T8, Out]
class CombineSignal9[T1, T2, T3, T4, T5, T6, T7, T8, T9, Out]
class SampleCombineSignalN[A, Out]
class SampleCombineSignal2[T0, T1, Out]
class SampleCombineSignal3[T0, T1, T2, Out]
class SampleCombineSignal4[T0, T1, T2, T3, Out]
class SampleCombineSignal5[T0, T1, T2, T3, T4, Out]
class SampleCombineSignal6[T0, T1, T2, T3, T4, T5, Out]
class SampleCombineSignal7[T0, T1, T2, T3, T4, T5, T6, Out]
class SampleCombineSignal8[T0, T1, T2, T3, T4, T5, T6, T7, Out]
class SampleCombineSignal9[T0, T1, T2, T3, T4, T5, T6, T7, T8, Out]
class SwitchSignal[A]
class FoldLeftSignal[A, B]
class MapSignal[I, O]
class DerivedVarSignal[A, B]
class Val[A]
class FutureSignal[A]

Value members

Abstract methods

protected def initialValue: Try[A]

Evaluate initial value of this Signal. This method must only be called once, when this value is first needed. You should override this method as def (no val or lazy val) to avoid holding a reference to the initial value beyond the duration of its relevance.

Evaluate initial value of this Signal. This method must only be called once, when this value is first needed. You should override this method as def (no val or lazy val) to avoid holding a reference to the initial value beyond the duration of its relevance.

Concrete methods

final override protected def fireError(nextError: Throwable, transaction: Transaction): Unit
Definition Classes
override protected def fireTry(nextValue: Try[A], transaction: Transaction): Unit

Signal propagates only if its value has changed

Signal propagates only if its value has changed

Definition Classes
final override protected def fireValue(nextValue: A, transaction: Transaction): Unit
Definition Classes
protected def setCurrentValue(newValue: Try[A]): Unit

Inherited methods

override def addObserver(observer: Observer[A])(implicit owner: Owner): Subscription

Subscribe an external observer to this observable

Subscribe an external observer to this observable

Definition Classes
Inherited from:
WritableObservable
def changes: EventStream[A]
Inherited from:
Signal
def compose[B](operator: Signal[A] => Signal[B]): Signal[B]
Value parameters:
operator

Note: Must not throw!

Inherited from:
Signal
def composeAll[B](changesOperator: EventStream[A] => EventStream[B], initialOperator: Try[A] => Try[B]): Signal[B]
Value parameters:
changesOperator

Note: Must not throw!

initialOperator

Note: Must not throw!

Inherited from:
Signal
def composeChanges[AA >: A](operator: EventStream[A] => EventStream[AA]): Signal[AA]
Value parameters:
operator

Note: Must not throw!

Inherited from:
Signal
override def debugWith(debugger: Debugger[A]): Signal[A]

See also debug methods in com.raquo.airstream.debug.DebuggableObservable

See also debug methods in com.raquo.airstream.debug.DebuggableObservable

Definition Classes
Inherited from:
Signal
protected def defaultDisplayName: String

This is the method that subclasses override to preserve the user's ability to set custom display names.

This is the method that subclasses override to preserve the user's ability to set custom display names.

Inherited from:
Named
final def displayName: String
Inherited from:
Named
def flatMap[B, Inner[_], Output <: (Observable)](compose: A => Inner[B])(implicit strategy: FlattenStrategy[Signal, Inner, Output]): Output[B]
Value parameters:
compose

Note: guarded against exceptions

Inherited from:
BaseObservable
def foldLeft[B](makeInitial: A => B)(fn: (B, A) => B): Signal[B]
Value parameters:
fn

Note: guarded against exceptions

makeInitial

Note: guarded against exceptions

Inherited from:
Signal
def foldLeftRecover[B](makeInitial: Try[A] => Try[B])(fn: (Try[B], Try[A]) => Try[B]): Signal[B]
Value parameters:
fn

(currentValue, nextParentValue) => nextValue

makeInitial

currentParentValue => initialValue Note: must not throw

Inherited from:
Signal
def foreach(onNext: A => Unit)(implicit owner: Owner): Subscription

Create an external observer from a function and subscribe it to this observable.

Create an external observer from a function and subscribe it to this observable.

Note: since you won't have a reference to the observer, you will need to call Subscription.kill() to unsubscribe

Inherited from:
BaseObservable
override def map[B](project: A => B): Signal[B]
Value parameters:
project

Note: guarded against exceptions

Definition Classes
Inherited from:
Signal
def mapTo[B](value: => B): Self[B]

value is passed by name, so it will be evaluated whenever the Observable fires. Use it to sample mutable values (e.g. myInput.ref.value in Laminar).

value is passed by name, so it will be evaluated whenever the Observable fires. Use it to sample mutable values (e.g. myInput.ref.value in Laminar).

See also: mapToStrict

Value parameters:
value

Note: guarded against exceptions

Inherited from:
BaseObservable
def mapToStrict[B](value: B): Self[B]

value is evaluated strictly, only once, when this method is called.

value is evaluated strictly, only once, when this method is called.

See also: mapTo

Inherited from:
BaseObservable
override protected def numAllObservers: Int

Total number of internal and external observers

Total number of internal and external observers

Definition Classes
Inherited from:
WritableObservable
def observe(implicit owner: Owner): OwnedSignal[A]

Add a noop observer to this signal to ensure that it's started. This lets you access .now and .tryNow on the resulting StrictSignal.

Add a noop observer to this signal to ensure that it's started. This lets you access .now and .tryNow on the resulting StrictSignal.

You can use myStream.toWeakSignal.observe.tryNow() to read the last emitted value from event streams just as well.

Inherited from:
Signal
override def recover[B >: A](pf: PartialFunction[Throwable, Option[B]]): Signal[B]
Value parameters:
pf

Note: guarded against exceptions

Definition Classes
Inherited from:
Signal
def recoverIgnoreErrors: Self[A]
Inherited from:
BaseObservable
override def recoverToTry: Signal[Try[A]]

Convert this to an observable that emits Failure(err) instead of erroring

Convert this to an observable that emits Failure(err) instead of erroring

Definition Classes
Inherited from:
Signal
def setDisplayName(name: String): Named.this.type

Set the display name for this instance (observable or observer).

Set the display name for this instance (observable or observer).

  • This method modifies the instance and returns this. It does not create a new instance.
  • New name you set will override the previous name, if any. This might change in the future. For the sake of sanity, don't call this more than once for the same instance.
  • If display name is set, toString will output it instead of the standard type@hashcode string
Inherited from:
Named
override def toObservable: Signal[A]
Definition Classes
Inherited from:
Signal
def toSignalIfStream[B >: A](ifStream: EventStream[A] => Signal[B]): Signal[B]
Inherited from:
BaseObservable
def toStreamIfSignal[B >: A](ifSignal: Signal[A] => EventStream[B]): EventStream[B]
Inherited from:
BaseObservable
final override def toString: String

Override defaultDisplayName instead of this, if you need to.

Override defaultDisplayName instead of this, if you need to.

Definition Classes
Named -> Any
Inherited from:
Named
def toWeakSignal: Signal[Option[A]]

Convert this observable to a signal of Option[A]. If it is a stream, set initial value to None.

Convert this observable to a signal of Option[A]. If it is a stream, set initial value to None.

Inherited from:
BaseObservable

Concrete fields

protected var maybeLastSeenCurrentValue: UndefOr[Try[A]]

Inherited fields

protected val externalObservers: ObserverList[Observer[A]]

Note: Observer can be added more than once to an Observable. If so, it will observe each event as many times as it was added.

Note: Observer can be added more than once to an Observable. If so, it will observe each event as many times as it was added.

Inherited from:
WritableObservable
protected val internalObservers: ObserverList[InternalObserver[A]]

Note: This is enforced to be a Set outside of the type system #performance

Note: This is enforced to be a Set outside of the type system #performance

Inherited from:
WritableObservable