ActionController class

A controller which is used to store and invoke action callbacks. This controller can be used to implement point-to-point communication across widgets. If you want to use publish/subscribe pattern, or said event bus, please use https://pub.dev/packages/event_bus.

Example:

class WidgetA extends StatelessWidget {
  WidgetA({Key? key}) : super(key: key);
  final _action = ActionController()..addAction('key', () { /* do something */ }); // add action

  @override
  Widget build(BuildContext context) => WidgetB(action: _action);
}

class WidgetB extends StatelessWidget {
  const WidgetB({Key? key, required this.action}) : super(key: key);
  final ActionController action;

  @override
  Widget build(BuildContext context) => MaterialButton(onPressed: () => action.invoke('key')); // invoke action
}

Constructors

ActionController()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

addAction<T>([dynamic key = '', Action<T>? action]) → void

Adds an action.

containsAction([dynamic key = '']) → bool

Checks if controller contains the given action key.

dispose() → void

getAction<T>([dynamic key = '']) → Action<T>?

Gets the action by the given key, returns null if not found.

invoke<T>([dynamic key = '']) → T?

Invokes an action by the given key, returns null if not found.

invokeWhere(bool where(dynamic)) → List

Invokes some actions by the given where key condition, and returns the list of returned results.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

removeAction<T>([dynamic key = '']) → void

Removes an action.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited