Flivver

A clean solution to handling callbacks for custom events as a dart library. Are you tired of maintaining initialisation and dispose api of multiple packages in single method? This package helps you modularise event callbacks, allowing for clean, readable and composable code.

Flivver API promotes:

• testability
• composability
• ability to create custom events
• type safety

Example

See example/example.dart for a complete example.

• Register a service

  EventHandler.I.registerEventService<MyEventService>(
    MyEventService(),
  );
  EventHandler.I.registerEventServiceLazy<MyOtherEventService>(
    () => MyOtherEventService(),
  );

• Unregister a service

  EventHandler.I.unregisterEventService(MyEventService());
  // Or
  EventHandler.I.unregisterEventService<MyEventService>();

• Unregister all services or reset the singleton

  EventHandler.I.reset()
  // Or
  EventHandler.newInstance();

• Create Event Service

class DependencyInjectionService implements EventService {
  @override
  void call<Event extends Object>(Event currentEvent) {
    if (currentEvent is StartupEvent) {
      // initialising non-auth dependencies
    } else if (currentEvent is LogInEvent || currentEvent is SignInEvent) {
      // initialising auth dependencies
    } else if (currentEvent is LogOutEvent) {
      // clearing dependencies
    }
  }
}

Events

Flivver only cares about the type, Events can be classes or enums. Events can be anything, every service is associated with a list of events for which it will be called.

Event Service

Event services are classes that implement the EventService. These services are registered with the EventHandler against selected events. It has one call method that will be called for events that the service was registered against.