CustomValueNotifier<T> class Null safety

Sometimes you want a ValueNotifier where you can control when its listeners are notified. With the CustomValueNotifier you can do this: If you pass CustomNotifierMode.always for the mode parameter, notifierListeners will be called everytime you assign a value to the value property independent of if the value is different from the previous one. If you pass CustomNotifierMode.manual for the mode parameter, notifierListeners will not be called when you assign a value to the value property. You have to call it manually to notify the Listeners.

Inheritance
Implemented types
Available Extensions

Constructors

CustomValueNotifier(T initialValue, {CustomNotifierMode mode = CustomNotifierMode.normal})

Properties

hashCode int
The hash code for this object.
read-onlyinherited
hasListeners bool
Whether any listeners are currently registered.
@protectedread-onlyinherited
mode CustomNotifierMode
final
runtimeType Type
A representation of the runtime type of the object.
read-onlyinherited
value ↔ T
The current value of the object. When the value changes, the callbacks registered with addListener will be invoked.
read / writeoverride-getter

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
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).
@mustCallSuperinherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
override
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toString() String
A string representation of this object.
inherited

Operators

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