AsyncComputed<T> class

A class that computes a value asynchronously and notifies listeners when the value changes.

This class allows you to track changes in a computed value derived from asynchronous operations. It automatically updates and notifies listeners whenever the underlying asynchronous operation completes.

Example usage:

final asyncValue = AsyncComputed(() async => await fetchData(), defaultValue: 'Loading...');
Inheritance

Constructors

AsyncComputed.new(Future<T> _getValue(), {T? defaultValue, T? beforeUpdate()?, bool notifyBeforeUpdate = true, void onError(dynamic error)?, dynamic immediate = false})
Creates an instance of AsyncComputed with the given async function.

Properties

beforeUpdate → T? Function()?
A callback function executed before the async computation begins. It can return an optional value that updates _value before the async process completes.
final
hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
mounted → bool
Whether the notifier is mounted.
no setterinherited
notifyBeforeUpdate → bool
Determines whether listeners should be notified before the async update completes.
final
onError → void Function(dynamic error)?
A callback triggered when an error occurs during computation.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
value → T?
Returns the current computed value, ensuring the async computation starts when accessed.
no setteroverride

Methods

addListener(VoidCallback listener) → void
Adds a listener to be notified when the computed value changes.
override
dispose() → void
Disposes of the AsyncComputed instance, cancelling any ongoing computation.
override
force(T? value) → void
Forces the computed value to the given value, notifying listeners if the value changes.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
select<U>(U getter(T? value)) → Computed<U>
Creates a Computed that selects a value from the notifier.
inherited
toString() → String
Returns a string representation of the AsyncComputed object.
override

Operators

operator ==(Object other) → bool
The equality operator.
inherited