RxCommand<TParam, TResult> constructor

RxCommand<TParam, TResult>(Subject<CommandResult<TResult>> _commandResultsSubject, Observable<bool> canExecuteRestriction, bool _emitLastResult, bool _resultSubjectIsBehaviourSubject)

Implementation

RxCommand(this._commandResultsSubject, Observable<bool> canExecuteRestriction, this._emitLastResult, this._resultSubjectIsBehaviourSubject)
    : super(_commandResultsSubject) {

  _resultsSubject = _resultSubjectIsBehaviourSubject ?  new BehaviorSubject<TResult>() : new PublishSubject<TResult>();

  this.where((x) => x.hasError).listen((x) => _thrownExceptionsSubject.add(x.error));

  this.listen((x) => _isExecutingSubject.add(x.isExecuting));

  final _canExecuteParam = canExecuteRestriction == null
      ? new Observable<bool>.just(true)
      : canExecuteRestriction.handleError((error) {
          if (error is Exception) {
            _thrownExceptionsSubject.add(error);
          }
        }).distinct();

  _canExecuteParam.listen((canExecute) {
    _canExecute = canExecute && (!_isRunning);
    _executionLocked = !canExecute;
    _canExecuteSubject.add(_canExecute);
  });
}