signals library

Classes

AsyncData<T>

State for an AsyncState with a value

AsyncError<T>

State for an AsyncState with an error

AsyncLoading<T>

State for an AsyncState with a loading state

AsyncSignal<T>

A compound Signal that wraps a Stream or Future

AsyncState<T>

State for an AsyncSignal

Computed<T>

Data is often derived from other pieces of existing data. The computed function lets you combine the values of multiple signals into a new signal that can be reacted to, or even used by additional computeds. When the signals accessed from within a computed callback change, the computed callback is re-executed and its new return value becomes the computed signal's value.

Connect<T>

Connects a Stream to a Signal.

FutureSignal<T>

IterableSignal<E>

A Signal that holds a Iterable.

ListSignal<E>

A Signal that holds a List.

LoggingSignalsObserver

MapSignal<K, V>

A Signal that holds a Map.

ReadonlySignal<T>

SetSignal<E>

A Signal that holds a Set.

Signal<T>

The signal function creates a new signal. A signal is a container for a value that can change over time. You can read a signal's value or subscribe to value updates by accessing its .value property.

SignalContainer<T, Arg, S extends ReadonlySignal<T>>

Signal container used to create signals based on args

SignalsObserver

StreamSignal<T>

TimerSignal

Emit recurring TimerSignalEvent aka AsyncSignal

ValueSignal<T>

Signal that can be extended and used as a class

Extensions

SignalFutureUtils on Future<T>

Extension on future to provide helpful methods for signals

SignalIterableUtils on Iterable<T>

Extension on future to provide helpful methods for signals

SignalListUtils on List<T>

Extension on future to provide helpful methods for signals

SignalMapUtils on Map<K, V>

Extension on future to provide helpful methods for signals

SignalSetUtils on Set<T>

Extension on future to provide helpful methods for signals

SignalStreamUtils on Stream<T>

Extension on stream to provide helpful methods for signals

TimerSignalDurationUtils on Duration

Expose Duration as a TimerSignal

Functions

batch<T>(BatchCallback<T> callback) → T

The batch function allows you to combine multiple signal writes into one single update that is triggered at the end when the callback completes.

computed<T>(ComputedCallback<T> compute, {String? debugLabel}) → Computed<T>

Data is often derived from other pieces of existing data. The computed function lets you combine the values of multiple signals into a new signal that can be reacted to, or even used by additional computeds. When the signals accessed from within a computed callback change, the computed callback is re-executed and its new return value becomes the computed signal's value.

connect<T>(Signal<T> signal, [Stream<T>? stream]) → Connect<T>

Connects a Signal to a Stream.

disableSignalsDevTools() → void

effect(EffectCallback compute, {String? debugLabel}) → EffectCleanup

The effect function is the last piece that makes everything reactive. When you access a signal inside its callback function, that signal and every dependency of said signal will be activated and subscribed to. In that regard it is very similar to computed. By default all updates are lazy, so nothing will update until you access a signal inside effect.

futureSignal<T>(Future<T> future(), {T? initialValue, String? debugLabel, bool fireImmediately = false}) → FutureSignal<T>

iterableSignal<T>(Iterable<T> iterable, {String? debugLabel}) → IterableSignal<T>

Create an IterableSignal from Iterable

listSignal<T>(List<T> list, {String? debugLabel}) → ListSignal<T>

Create an ListSignal from List

mapSignal<K, V>(Map<K, V> map, {String? debugLabel}) → MapSignal<K, V>

Create an MapSignal from Map

reloadSignalsDevTools() → void

setSignal<T>(Set<T> list, {String? debugLabel}) → SetSignal<T>

Create an SetSignal from Set

signal<T>(T value, {String? debugLabel}) → Signal<T>

The signal function creates a new signal. A signal is a container for a value that can change over time. You can read a signal's value or subscribe to value updates by accessing its .value property.

signalContainer<T, Arg>(ReadonlySignal<T> create(Arg), {bool cache = false}) → SignalContainer<T, Arg, ReadonlySignal<T>>

Create a signal container used to instance signals based on args

streamSignal<T>(Stream<T> stream(), {T? initialValue, bool? cancelOnError, String? debugLabel, void onDone()?}) → StreamSignal<T>

timerSignal(Duration every, {String debugLabel = 'Timer', bool? cancelOnError}) → TimerSignal

Create a TimerSignal

untracked<T>(UntrackedCallback<T> callback) → T

In case when you're receiving a callback that can read some signals, but you don't want to subscribe to them, you can use untracked to prevent any subscriptions from happening.

Typedefs

AsyncDataBuilder<E, T> = E Function(T value)

Value builder for AsyncState

AsyncErrorBuilder<E> = E Function(Object error, StackTrace? stackTrace)

Error builder for AsyncState

AsyncSignalBuilder<R> = R Function()

Builder on a AsyncSignal callback

AsyncSignalErrorBuilder<R> = R Function(Object? error)

Builder on a AsyncSignal error

AsyncSignalState<T> = AsyncState<T>

AsyncSignalStateData<T> = AsyncData<T>

AsyncSignalStateError<T> = AsyncError<T>

AsyncSignalStateLoading<T> = AsyncLoading<T>

AsyncSignalValueBuilder<R, T> = R Function(T value)

Builder on a successful AsyncSignal value

AsyncStateBuilder<E> = E Function()

Generic builder for AsyncState

EffectCleanup = void Function()

Clean up function to stop subscriptions from updating the callback

TimerSignalEvent = ({int iteration, int millis})

Time event to react to