Model class abstract

A base class that holds some data and allows other classes to listen to changes to that data.

In order to notify listeners that the data has changed, you must explicitly call the notifyListeners method.

Generally used in conjunction with a ScopedModel Widget, but if you do not need to pass the Widget down the tree, you can use a simple AnimatedBuilder to listen for changes and rebuild when the model notifies the listeners.

Example

class CounterModel extends Model {
  int _counter = 0;

  int get counter => _counter;

  void increment() {
    // First, increment the counter
    _counter++;

    // Then notify all the listeners.
    notifyListeners();
  }
}

Inheritance

• Object
• Listenable
• Model

Constructors

Model()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

listenerCount → int

Returns the number of listeners listening to this model.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

addListener(VoidCallback listener) → void

listener will be invoked when the model changes.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notifyListeners() → void

Should be called only by Model when the model has changed.

removeListener(VoidCallback listener) → void

listener will no longer be invoked when the model changes.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited