WritableComputed<T> class abstract interface

Interface for writable computed reactive values.

WritableComputed allows you to create computed values that can also be set directly. When set, the setter function is called to update the underlying dependencies.

Example:

final firstName = Signal('John');
final lastName = Signal('Doe');

WritableComputed<String> fullName = WritableComputed(
  () => '${firstName.value} ${lastName.value}',
  (value) {
    final parts = value.split(' ');
    firstName.value = parts[0];
    lastName.value = parts[1];
  },
);

Implemented types

• Computed<T>
• Signal<T>

Available extensions

• JoltReadonlyExtension
• JoltSignalExtension
• JoltValueListenableExtension
• JoltValueNotifierExtension
• JoltWritableComputedExtension
• JoltWritableExtension

Constructors

WritableComputed(T getter(), void setter(T), {JoltDebugFn? onDebug})

Creates a new writable computed value.

factory

WritableComputed.withPrevious(T getter(T?), void setter(T), {JoltDebugFn? onDebug})

Creates a writable computed value with a getter that receives the previous value.

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

isDisposed → bool

Whether this node has been disposed.

no setter, inherited

listenable → JoltValueListenable<T>

Available on Readonly<T>, provided by the JoltValueListenableExtension extension

Converts this Jolt value to a Flutter ValueListenable.

no setter

notifier → JoltValueNotifier<T>

Available on Writable<T>, provided by the JoltValueNotifierExtension extension

Converts this Jolt value to a Flutter ValueNotifier.

no setter

peek → T

Gets the current value without establishing a reactive dependency.

no setter, inherited

peekCached → T

Returns the cached computed value without establishing a reactive dependency.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

stream → Stream<T>

Available on ReadonlyNode<T>, provided by the JoltReadonlyExtension extension

Converts this reactive value to a broadcast stream.

no setter

value ↔ T

Gets the current value and establishes a reactive dependency.

getter/setter pair, inherited

Methods

call() → T

Returns the current computed value (same as value).

override

dispose() → void

Disposes this node and cleans up resources.

inherited

get() → T

Gets the current value and establishes a reactive dependency.

inherited

listen(void onData(T event)?, {Function? onError, void onDone()?, bool? cancelOnError, bool immediately = false}) → StreamSubscription<T>

Available on ReadonlyNode<T>, provided by the JoltReadonlyExtension extension

Creates a stream subscription that listens to changes in this reactive value.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notify() → void

Manually notifies all subscribers that this value has changed.

inherited

readonly() → ReadonlySignal<T>

Available on Signal<T>, provided by the JoltSignalExtension extension

Returns a read-only view of this signal.

readonly() → Computed<T>

Available on WritableComputed<T>, provided by the JoltWritableComputedExtension extension

Returns a read-only view of this writable computed.

set(T value) → T

Sets a new value for this reactive value.

inherited

toString() → String

A string representation of this object.

inherited

until(bool predicate(T value)) → Future<T>

Available on ReadonlyNode<T>, provided by the JoltReadonlyExtension extension

Waits until the reactive value satisfies a predicate condition.

update(T updater(T value)) → T

Available on WritableNode<T>, provided by the JoltWritableExtension extension

Updates the value using an updater function based on the current value.

Operators

operator ==(Object other) → bool

The equality operator.

inherited