A read-only reactive signal whose value is automatically computed and cached based on other signals it depends on.
FlutterComputed extends the core Computed signal and implements Flutter's
ValueListenable, making it seamlessly compatible with native Flutter widgets
(like ValueListenableBuilder) and other ecosystem packages.
Example Usage#
final count = signal(2);
final doubled = computed(() => count.value * 2);
print(doubled.value); // 4
count.value = 5;
print(doubled.value); // 10
Custom Signals#
To create a custom signal that behaves like a computed value and implements ValueListenable,
you can extend FlutterComputed directly or mix in ValueListenableSignalMixin.
Constructors#
View Constructors
FlutterComputed(super.internalValue, {super.options, @Deprecated('Use options: ComputedOptions(autoDispose: ...) instead') super.autoDispose, @Deprecated('Use options: ComputedOptions(name: ...) instead') super.debugLabel, this.runCallbackOnListen = false})
Create a new signal that is computed based on the values of other signals.
The returned computed signal is read-only, and its value is automatically updated when any signals accessed from within the callback function change.