Producer<T> class
abstract
The base class for all beacons.
- Implemented types
- Implementers
- Available extensions
Constructors
- Producer.new({T? initialValue, String? name})
- Creates a new Producer.
Properties
-
$$widgetSubscribers$$
→ Set<
int> -
The hashcode of all widgets subscribed to this beacon.
This should not be used directly.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- initialValue → T
-
The initial value of the beacon.
no setter
- isDisposed → bool
-
Returns true if the beacon has been disposed.
no setter
- isEmpty → bool
-
Returns true if the beacon has not been initialized.
no setter
- listenersCount → int
-
The number of listeners subscribed to this beacon.
no setter
- name → String
-
The name of the beacon. For debugging purposes.
no setter
- previousValue → T?
-
The previous value of the beacon.
no setter
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- value → T
-
Returns the current value and subscribes to changes in the beacon
when used within a
Beacon.effectorBeacon.derived.no setter
Methods
-
call(
) → T - Equivalent to calling value getter.
-
dispose(
) → void -
Clears all registered listeners and
resouces used by the beacon. You will
not be able to update or subscribe to
the beacon after it has been disposed.
override
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
observe(
BuildContext context, ObserverCallback< T> callback, {bool synchronous = false}) → void -
Available on BaseBeacon<
Observes the state of a beacon and triggers a callback with the current state.T> , provided by the WidgetUtils extension -
onDispose(
VoidCallback callback) → VoidCallback - Registers a callback to be called when the beacon is disposed. Returns a function that can be called to remove the callback.
-
peek(
) → T - Return the current value of the beacon without subscribing to it.
-
subscribe(
void callback(T), {bool startNow = true, bool synchronous = false}) → VoidCallback - Subscribes to changes in the beacon returns a function that can be called to unsubscribe
-
toString(
) → String -
A string representation of this object.
override
-
watch(
BuildContext context) → T -
Available on BaseBeacon<
Watches a beacon and triggers a widget rebuild when its value changes.T> , provided by the WidgetUtils extension
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited