RestorableNumN<T extends num?> class
A RestorableProperty that knows how to store and restore a num that is nullable.
The current value of this property is stored in the restoration data. During state restoration the property is restored to the value it had when the restoration data it is getting restored from was collected.
If no restoration data is available, value is initialized to the
defaultValue given in the constructor.
Instead of using the more generic RestorableNumN directly, consider using one of the more specific subclasses (e.g. RestorableDoubleN to store a double and RestorableIntN to store an int).
See also:
- RestorableNum for the non-nullable version of this class.
- Inheritance
-
- Object
- ChangeNotifier
- RestorableProperty<
T> - RestorableValue<
T> - RestorableNumN
- Implementers
Constructors
- RestorableNumN(T defaultValue)
- Creates a RestorableNumN.
Properties
- enabled → bool
-
Whether the object currently returned by toPrimitives should be included
in the restoration state.
no setterinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- hasListeners → bool
-
Whether any listeners are currently registered.
no setterinherited
- isRegistered → bool
-
Whether this property is currently registered with a RestorationMixin.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
state
→ State<
StatefulWidget> -
The State object that this property is registered with.
no setterinherited
- value ↔ T
-
The current value stored in this property.
getter/setter pairinherited
Methods
-
addListener(
VoidCallback listener) → void -
Register a closure to be called when the object changes.
inherited
-
createDefaultValue(
) → T -
Called by the RestorationMixin if no restoration data is available to
restore the value of the property from to obtain the default value for the
property.
inherited
-
didUpdateValue(
T? oldValue) → void -
Called whenever a new value is assigned to value.
inherited
-
dispose(
) → void -
Discards any resources used by the object. After this is called, the
object is not in a usable state and should be discarded (calls to
addListener will throw after the object is disposed).
inherited
-
fromPrimitives(
Object? serialized) → T -
Called by the RestorationMixin to convert the
datapreviously retrieved from toPrimitives back into an object of typeTthat this property should wrap.inherited -
initWithValue(
T value) → void -
Called by the RestorationMixin with the
valuereturned by either createDefaultValue or fromPrimitives to set the value that this property currently wraps.inherited -
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
-
toPrimitives(
) → Object? -
Called by the RestorationMixin to retrieve the information that this
property wants to store in the restoration data.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited