FlutterComputed<T> class
A signal based on the value of a computation
- Inheritance
- Implemented types
- Mixed-in types
- Available extensions
Constructors
- FlutterComputed(T internalValue(), {bool autoDispose = false, String? debugLabel})
- Create a new signal that is computed based on the values of other signals.
Properties
- autoDispose ↔ bool
-
Throws and error if read after dispose and can be
disposed on last unsubscribe.
getter/setter pairinherited
- brand → Symbol
-
finalinherited
- debugLabel → String?
-
Debug label for Debug Mode
finalinherited
- disposed ↔ bool
-
Check if the effect is disposed
getter/setter pairinherited
- error ↔ Object?
-
getter/setter pairinherited
- flags ↔ int
-
getter/setter pairinherited
- fn ↔ T Function()
-
getter/setter pairinherited
- globalId → int
-
Global ID of the signal
finalinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- internalGlobalVersion ↔ int
-
getter/setter pairinherited
- internalValue ↔ T
-
getter/setter pairinherited
- isInitialized → bool
-
Check if the value has been computed
no setterinherited
- node ↔ Node?
-
getter/setter pairinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- sources ↔ Node?
-
getter/setter pairinherited
- targets ↔ Node?
-
getter/setter pairinherited
- untrackedValue → T
-
Available on ReadonlySignal<
Runs a callback function that returns the signal value without subscribing to the signal updates.T> , provided by the ReadonlySignalUntrackedValueUtils extensionno setter - value → T
-
Compute the current value
no setterinherited
- version ↔ int
-
Version numbers should always be >= 0, because the special value -1 is used
by Nodes to signify potentially unused but recyclable nodes.
getter/setter pairinherited
Methods
-
addListener(
VoidCallback listener) → void -
Register a closure to be called when the object notifies its listeners.
inherited
-
afterCreate(
T val) → void -
Internal hook for after a signal is created
inherited
-
beforeUpdate(
T val) → void -
Internal hook for after a signal is updated
inherited
-
call(
) → T -
Return the value when invoked
inherited
-
dispose(
) → void -
Dispose the signal
inherited
-
get(
) → T -
Helper method to get the current value
inherited
-
internalRefresh(
) → bool -
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
notify(
) → void -
inherited
-
onDispose(
void cleanup()) → EffectCleanup -
Add a cleanup function to be called when the signal is disposed
inherited
-
overrideWith(
T val) → Computed< T> -
Override the current signal with a new value as if it was created with it
inherited
-
peek(
) → T -
In the rare instance that you have an effect that should write to another signal based on the previous value, but you don't want the effect to be subscribed to that signal, you can read a signals's previous value via
signal.peek().inherited -
readonly(
) → ReadonlySignal< T> -
Returns a readonly signal
inherited
-
recompute(
) → void -
Call the computed function and update the value
inherited
-
removeListener(
VoidCallback listener) → void -
Remove a previously registered closure from the list of closures that the
object notifies.
inherited
-
select<
R> (R selector(ReadonlySignal< T> ), {bool autoDispose = false, String? debugLabel}) → Computed<R> -
Available on ReadonlySignal<
Select a value and return a computed signal to listen for changesT> , provided by the ReadonlySignalUtils extension -
subscribe(
void fn(T value)) → void Function() -
Subscribe to value changes with a dispose function
inherited
-
subscribeToNode(
Node node) → void -
inherited
-
toJson(
) → dynamic -
Convert value to JSON
inherited
-
toSignal(
{String? debugLabel, bool autoDispose = false}) → ReadonlySignal< T> -
Available on ValueListenable<
SignalValueNotifierT> , provided by the SignalValueListenableUtils extension -
toStream(
) → Stream< T> -
Available on ReadonlySignal<
Convert a signal to a Stream to be consumed as a read only stream.T> , provided by the ReadonlySignalUtils extension -
toString(
) → String -
A string representation of this object.
inherited
-
unsubscribeFromNode(
Node node) → void -
inherited
-
unwatch(
BuildContext context) → void -
Available on ReadonlySignal<
Stop subscriptions to updates on a signal for watchersT> , provided by the FlutterReadonlySignalUtils extension -
watch(
BuildContext context, {String? debugLabel}) → T -
Available on ReadonlySignal<
Rebuild the Element that the current signal is inside ofT> , provided by the FlutterReadonlySignalUtils extension
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited