ChangeNotifier class

A class that can be extended or mixed in that provides a change notification API.

This class maintains a list of listeners that can be notified when the object changes. It's useful for implementing the observer pattern.

Example:

class MyModel extends ChangeNotifier {
  int _value = 0;

  int get value => _value;

  void increment() {
    _value++;
    notifyListeners();
  }
}
Implementers

Constructors

ChangeNotifier()

Properties

hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

addListener(dynamic listener()) → void
Register a closure to be called when the object changes.
dispose() → void
Discards any resources used by the object.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
removeListener(dynamic listener()) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
toString() → String
A string representation of this object.
inherited

Operators

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