SignalsObserver class abstract

You can observe all signal values in the dart application by providing an implementation of SignalsObserver:

abstract class SignalsObserver {
  void onSignalCreated(Signal instance);
  void onSignalUpdated(Signal instance, dynamic value);
  void onComputedCreated(Computed instance);
  void onComputedUpdated(Computed instance, dynamic value);
  static SignalsObserver? instance;
}

There is a prebuilt LoggingSignalsObserver for printing updates to the console.

To add the observer override the instance at the start of the application:

void main() {
    SignalsObserver.instance = LoggingSignalsObserver(); // or custom observer
    ...
}

This will have a slight performance hit since every update will be tracked via the observer. It is recommended to only set the SignalsObserver.instance in debug or profile mode. @link https://dartsignals.dev/utilities/observer

Constructors

SignalsObserver()

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
onComputedCreated(Computed instance) → void
Called when a computed is created.
onComputedUpdated(Computed instance, dynamic value) → void
Called when a computed is updated.
onEffectCalled(Effect instance) → void
Called when a effect is called.
onEffectCreated(Effect instance) → void
Called when a effect is created.
onEffectRemoved(Effect instance) → void
Called when a effect is disposed.
onSignalCreated(Signal instance) → void
Called when a signal is created.
onSignalUpdated(Signal instance, dynamic value) → void
Called when a signal is updated.
toString() → String
A string representation of this object.
inherited

Operators

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

Static Properties

instance ↔ SignalsObserver?
The current observer instance.
getter/setter pair