createAsyncNoParamNoResult method

RxCommand<void, void> createAsyncNoParamNoResult (
  1. AsyncAction action,
  2. {Stream<bool> canExecute,
  3. bool emitInitialCommandResult: false,
  4. bool emitsLastValueToNewSubscriptions: false}
)

Creates a RxCommand for an asynchronous handler function with no parameter and no return type action: handler function canExecute : observable that can be used to enable/disable the command based on some other state change if omitted the command can be executed always except it's already executing isExecuting will issue a bool value on each state change. Even if you subscribe to a newly created command it will issue false For the Observable<CommandResult> that RxCommand implement this normally doesn't make sense if you want to get an initial Result with data==null, error==null, isExecuting==false pass emitInitialCommandResult=true. By default the results Observable and the RxCommand itself behave like a PublishSubject. If you want that it acts like a BehaviourSubject, meaning every listener gets the last received value, you can set emitsLastValueToNewSubscriptions = true.

Implementation

static RxCommand<void, void> createAsyncNoParamNoResult(AsyncAction action,
    {Stream<bool> canExecute,
    bool emitInitialCommandResult = false,
    bool emitsLastValueToNewSubscriptions = false}) {
  return RxCommandAsync<void, void>((_) async {
    await action();
    return null;
  }, canExecute, emitInitialCommandResult, false,
      emitsLastValueToNewSubscriptions, null);
}