ChangeNotifier class

A class that can be extended or mixed in that provides a change notification API using VoidCallback for notifications.

ChangeNotifier is optimized for small numbers (one or two) of listeners. It is O(N) for adding and removing listeners and O(N²) for dispatching notifications (where N is the number of listeners).

See also:

Implemented by




hasListeners → bool
Whether any listeners are currently registered. [...]
@protected, read-only
hashCode → int
The hash code for this object. [...]
read-only, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited


addListener(void listener) → void
Register a closure to be called when the object changes. [...]
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 and removeListener will throw after the object is disposed). [...]
notifyListeners() → void
Call all the registered listeners. [...]
removeListener(void listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toString() → String
Returns a string representation of this object.


operator ==(dynamic other) → bool
The equality operator. [...]