EventListener<CONTROLLER extends GetxController, EVENT_TYPE> class Null safety

Listener for EVENT_TYPE emitted by eventEmitter on CONTROLLER

This will automatically start listening to the eventEmitter for the EVENT_TYPE on the CONTROLLER once initialized. For the original and subsequent values emitted by the eventEmitter the execute method will be run with the value as an argument.

This can also be used on a workflow controller to react to every state emitted.

Example

class IsMetricChangedUpdateUnits
    extends EventListener<AppSettingsController, AppSettings> {
  /// Distance units
  final RxString distanceUnits = 'km'.obs;

  @override
  Rx<AppSettings> get eventEmitter => controller.settings;

  @override
  execute(AppSettings value) {
    distanceUnits.value = value.isMetric ? 'km' : 'mi';
  }
}