ChangeNotifier class Null safety

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

It is O(1) for adding listeners and O(N) for removing listeners and dispatching notifications (where N is the number of listeners).

See also:

Implemented types
Implementers

Constructors

ChangeNotifier()

Properties

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

Methods

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

Operators

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