Esempio n. 1
0
        public void AddCommandToChain(AbilityCommandInfo slaveCommand)
        {
            if (CommandSequence == 0)
            {
                if (NextCommand == null)
                {
                    NextCommand = slaveCommand;
                    slaveCommand.LastCommand = this;
                }
                else
                {
                    NextCommand.AddCommandToChain(slaveCommand);
                }
            }
            else
            {
                if (slaveCommand.CommandSequence < CommandSequence)
                {
                    LastCommand.NextCommand  = slaveCommand;
                    slaveCommand.LastCommand = LastCommand;
                    LastCommand = slaveCommand;
                    slaveCommand.NextCommand = this;
                }

                else if (NextCommand == null)
                {
                    NextCommand = slaveCommand;
                    slaveCommand.LastCommand = this;
                }
                else
                {
                    NextCommand.AddCommandToChain(slaveCommand);
                }
            }
        }
        /// <summary>
        /// Initialize the view model.
        /// </summary>
        public ZeroPressureSensorViewModel()
            : base("Zero Pressure Sensor")
        {
            // Initialize values
            _events         = IoC.Get <IEventAggregator>();
            _pm             = IoC.Get <PulseManager>();
            _adcpConnection = IoC.Get <AdcpConnection>();

            // Next command
            NextCommand = ReactiveCommand.Create();
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.DeployAdcpView)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            // Zero Pressure sensor command
            ZeroPressureSensorCommand = ReactiveCommand.Create();
            ZeroPressureSensorCommand.Subscribe(_ => ZeroPressureSensor());

            InitializeValue();
        }
Esempio n. 3
0
 private void NextAction(object o)
 {
     TransitionerIndex++;
     PreviousCommand.RaiseCanExecuteChanged();
     NextCommand.RaiseCanExecuteChanged();
     CreateCommand.RaiseCanExecuteChanged();
 }
Esempio n. 4
0
        /// <summary>
        /// Initialize the view model.
        /// </summary>
        public BottomTrackOnViewModel()
            : base("Bottom Track On")
        {
            // Initialize values
            _events = IoC.Get <IEventAggregator>();
            _pm     = IoC.Get <PulseManager>();

            ConfigKey = "";

            // Create the list
            CreateList();

            // Next command
            NextCommand = ReactiveCommand.Create();
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.BinsView, ConfigKey)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            MovingCommand = ReactiveCommand.Create();
            MovingCommand.Subscribe(_ => MovingBoat());

            MovingCommand = ReactiveCommand.Create();
            MovingCommand.Subscribe(_ => MonitoringAdcp());
        }
Esempio n. 5
0
        /// <summary>
        /// Create a base view for all the Averaging Views.
        /// </summary>
        public AveragingBaseViewModel()
            : base("AvergingBaseViewModel")
        {
            // Project Manager
            _pm = IoC.Get <PulseManager>();
            _pm.RegisterDisplayVM(this);
            _events = IoC.Get <IEventAggregator>();
            _events.Subscribe(this);

            // Initialize the dict
            _averagingVMDict = new ConcurrentDictionary <SubsystemDataConfig, AveragingViewModel>();

            // Create the ViewModels based off the AdcpConfiguration
            AddConfigurations();

            // Next command
            NextCommand = ReactiveCommand.Create();
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.SimpleCompassCalWizardView)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));
        }
Esempio n. 6
0
        // コンストラクタ

        public ConfigureApiKeyViewModel(DialogService dialogService, AddAccountService addAccountModel)
        {
            // DI
            _dialogService     = dialogService;
            _addAccountService = addAccountModel;

            // バリデーションを有効化する
            ConsumerKey.SetValidateAttribute(() => ConsumerKey);
            ConsumerSecret.SetValidateAttribute(() => ConsumerSecret);

            // ConsumerKeyとConsumerKeyが正しく入力されているときのみ「次へ」を押せるようにする
            NextCommand = new[]
            {
                ConsumerKey.ObserveHasErrors,
                ConsumerSecret.ObserveHasErrors
            }
            .CombineLatestValuesAreAllFalse()
            .ToReactiveCommand()
            .AddTo(Disposables);

            // 「次へ」が押されたらPinコード設定画面を開く
            NextCommand
            .Subscribe(() =>
            {
                _addAccountService.OpenAuthorizeUrl(ConsumerKey.Value, ConsumerSecret.Value);
                _dialogService.OpenConfigurePincodeView();
            })
            .AddTo(Disposables);
        }
Esempio n. 7
0
        /// <summary>
        /// Initialize the view model.
        /// </summary>
        public TemperatureViewModel()
            : base("Salinity")
        {
            // Initialize values
            _events = IoC.Get <IEventAggregator>();
            _pm     = IoC.Get <PulseManager>();


            // Next command
            NextCommand = ReactiveCommand.Create();
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.TimeView)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            // Salinity coommand
            SalinityCommand = ReactiveCommand.Create();
            SalinityCommand.Subscribe(param => OnSalinityCommand(param));

            InitializeValue();
        }
Esempio n. 8
0
        /// <summary>
        /// Initialize the view model.
        /// </summary>
        public TimeViewModel()
            : base("ADCP Time")
        {
            // Initialize values
            _events = IoC.Get <IEventAggregator>();
            _pm     = IoC.Get <PulseManager>();

            // Initialize the list
            TimeZoneList = new ReactiveList <AdcpTimeZoneOptions>();
            TimeZoneList.Add(new AdcpTimeZoneOptions(RTI.Commands.AdcpTimeZone.LOCAL, "Local", true));
            TimeZoneList.Add(new AdcpTimeZoneOptions(RTI.Commands.AdcpTimeZone.GMT, "GMT", false));

            // Next command
            NextCommand = ReactiveCommand.Create();
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.EnsembleIntervalView)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            // Local Date Time Command
            SetLocalDateTimeCommand = ReactiveCommand.Create();
            SetLocalDateTimeCommand.Subscribe(_ => SetLocalDateTime());

            // GMT Date Time Command
            SetGmtDateTimeCommand = ReactiveCommand.Create();
            SetGmtDateTimeCommand.Subscribe(_ => SetGmtDateTime());

            InitializeValue();
        }
Esempio n. 9
0
        /// <summary>
        /// Initialize the view model.
        /// </summary>
        public FrequencyViewModel()
            : base("Frequency ViewModel")
        {
            // Initialize values
            _events = IoC.Get <IEventAggregator>();
            _pm     = IoC.Get <PulseManager>();


            // Next command
            NextCommand = ReactiveCommand.Create(this.WhenAny(x => x.SelectedSubsystem, x => x.Value != null));
            NextCommand.Subscribe(_ => OnNextCommand());

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            FreqCommand = ReactiveCommand.Create();
            FreqCommand.Subscribe(param => AddConfig(param));

            // Set the possible subsystems
            SetSubsystems();
        }
        // コンストラクタ

        public ConfigurePincodeViewModel(DialogService dialogService, AddAccountService addAccountModel)
        {
            // DI
            _dialogService     = dialogService;
            _addAccountService = addAccountModel;

            // バリデーションを有効化する
            Pincode.SetValidateAttribute(() => Pincode);

            // Pincodeが入力されているときのみ「次へ」を押せるようにする
            NextCommand = Pincode
                          .ObserveHasErrors
                          .Select(x => !x)
                          .ToReactiveCommand()
                          .AddTo(Disposables);

            // 「次へ」が押されたらPinコードの認証を開始する
            NextCommand.Subscribe(() =>
            {
                _addAccountService.ConfigureAccessTokens(Pincode.Value);
                _dialogService.CloseConfigurePincodeView();
                _dialogService.CloseConfigureApiKeyView();
            })
            .AddTo(Disposables);
        }
    public ConfirmRecoveryWordsViewModel(List <RecoveryWordViewModel> mnemonicWords, KeyManager keyManager)
    {
        var confirmationWordsSourceList = new SourceList <RecoveryWordViewModel>();

        _isSkipEnable = Services.WalletManager.Network != Network.Main || System.Diagnostics.Debugger.IsAttached;

        var nextCommandCanExecute =
            confirmationWordsSourceList
            .Connect()
            .ObserveOn(RxApp.MainThreadScheduler)
            .WhenValueChanged(x => x.IsConfirmed)
            .Select(_ => confirmationWordsSourceList.Items.All(x => x.IsConfirmed));

        EnableBack = true;

        NextCommand = ReactiveCommand.Create(() => OnNext(keyManager), nextCommandCanExecute);

        if (_isSkipEnable)
        {
            SkipCommand = ReactiveCommand.Create(() => NextCommand.Execute(null));
        }

        CancelCommand = ReactiveCommand.Create(OnCancel);

        confirmationWordsSourceList
        .Connect()
        .ObserveOn(RxApp.MainThreadScheduler)
        .OnItemAdded(x => x.Reset())
        .Sort(SortExpressionComparer <RecoveryWordViewModel> .Ascending(x => x.Index))
        .Bind(out _confirmationWords)
        .Subscribe();

        // Select random words to confirm.
        confirmationWordsSourceList.AddRange(mnemonicWords.OrderBy(_ => new Random().NextDouble()).Take(3));
    }
Esempio n. 12
0
        /// <summary>
        /// Initialize the view model.
        /// </summary>
        public VesselMountViewModel()
            : base("Vessel Mount ViewModel")
        {
            // Initialize values
            _events = IoC.Get <IEventAggregator>();
            _events.Subscribe(this);
            _pm = IoC.Get <PulseManager>();

            // Get the singleton ADCP connection
            _adcpConnection = IoC.Get <AdcpConnection>();

            // Get Options
            GetOptions();

            // Set the list
            CommPortList = SerialOptions.PortOptions;
            BaudRateList = SerialOptions.BaudRateOptions;

            // Next command
            NextCommand = ReactiveCommand.Create();
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.AveragingView)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            // Set the lists
            InitLists();
            InitValues();
        }
Esempio n. 13
0
        internal INextResult Next(int threadId)
        {
            var cmd = new NextCommand(threadId);

            Session.Next(cmd);
            return(cmd.Result);
        }
Esempio n. 14
0
        /// <summary>
        /// Select whether to playback a file or a project.
        /// </summary>
        public SelectPlaybackViewModel()
            : base("Select Playback")
        {
            // Initialize values
            _pm     = IoC.Get <PulseManager>();
            _events = IoC.Get <IEventAggregator>();

            // Initialize values
            IsLoading = false;

            // Next command
            NextCommand = ReactiveCommand.Create();
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.ViewDataView)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            // Select a file to playback
            FilePlaybackCommand = ReactiveCommand.Create();
            FilePlaybackCommand.Subscribe(_ => PlaybackFile());

            // Project coommand
            ProjectPlaybackCommand = ReactiveCommand.Create();
            ProjectPlaybackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.LoadProjectsView)));
        }
        public void When(NextCommand cmd)
        {
            var agg = _repository.GetById <SampleAggregate, Sample>(cmd.Id);

            agg.Next(cmd.SomeDate);
            _repository.Save(agg);
        }
Esempio n. 16
0
        /// <summary>
        /// Intialize the view model.
        /// </summary>
        public CommunicationViewModel()
            : base("Communications")
        {
            // Set Event Aggregator
            _events = IoC.Get <IEventAggregator>();
            _pm     = IoC.Get <PulseManager>();

            // Get the singleton ADCP connection
            _adcpConnection = IoC.Get <AdcpConnection>();

            // Initialize the values
            InitValues();

            // Set the list
            CommPortList = SerialOptions.PortOptions;
            BaudRateList = SerialOptions.BaudRateOptions;

            // Next command
            NextCommand = ReactiveCommand.Create();
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.ScanAdcpView)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            // Scan for ADCP command
            ScanAdcpCommand = ReactiveCommand.Create();
            ScanAdcpCommand.Subscribe(_ => ScanForAdcp());
        }
Esempio n. 17
0
        public void StepOver()
        {
            NextCommand nextCommand = new NextCommand();

            nextCommand.InBackground = true;
            ExecuteCommand(nextCommand);
        }
Esempio n. 18
0
        /// <summary>
        /// Initialize the view model.
        /// </summary>
        public ScanAdcpViewModel()
            : base("Scan ADCP")
        {
            // Initialize values
            _events         = IoC.Get <IEventAggregator>();
            _pm             = IoC.Get <PulseManager>();
            _adcpConnection = IoC.Get <AdcpConnection>();

            // Serial Number Generator view model
            SerialNumberGeneratorVM              = IoC.Get <SerialNumberGeneratorViewModel>();
            SerialNumberGeneratorVM.UpdateEvent += SerialNumberGeneratorVM_UpdateEvent;

            // Next command
            NextCommand = ReactiveCommand.Create(this.WhenAny(x => x.IsScanning, x => !x.Value));
            NextCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.ModeView)));

            // Back coommand
            BackCommand = ReactiveCommand.Create();
            BackCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.Back)));

            // Exit coommand
            ExitCommand = ReactiveCommand.Create();
            ExitCommand.Subscribe(_ => _events.PublishOnUIThread(new ViewNavEvent(ViewNavEvent.ViewId.HomeView)));

            // Scan ADCP command
            ScanAdcpCommand = ReactiveCommand.CreateAsyncTask(_ => ScanAdcp());

            InitializeValue();
        }
Esempio n. 19
0
        public override void FinishParsingGetCommand()
        {
            ParseName();

            if (ObjData.Name.Equals("all", StringComparison.OrdinalIgnoreCase))
            {
                NextCommand.Cast <IGetCommand>().GetAll = true;
            }
            else if ((ActorRoom.Uid == 4 || ActorRoom.Uid == 20 || ActorRoom.Uid == 22) && ObjData.Name.IndexOf("torch", StringComparison.OrdinalIgnoreCase) >= 0)
            {
                gOut.Print("All torches are bolted to the wall and cannot be removed.");

                NextState = Globals.CreateInstance <IMonsterStartState>();
            }
            else
            {
                ObjData.RecordWhereClauseList = new List <Func <IGameBase, bool> >()
                {
                    r => r is IArtifact a && a.IsInRoom(ActorRoom),
                    r => r is IArtifact a && a.IsEmbeddedInRoom(ActorRoom),
                    r => r is IArtifact a && (a.IsCarriedByContainerContainerTypeExposedToCharacter(gEngine.ExposeContainersRecursively) || a.IsCarriedByContainerContainerTypeExposedToRoom(ActorRoom, gEngine.ExposeContainersRecursively))
                };

                ObjData.RecordNotFoundFunc = NextCommand.PrintCantVerbThat;

                ResolveRecord(false);
            }
        }
    }
 public void Done()
 {
     _connectedUasManager.Active.Transport.SendMessage(UasCommands.PreflightCalibration(_connectedUasManager.Active.Uas.SystemId, _connectedUasManager.Active.Uas.ComponentId, 0, 0, 0, 0, 2, 0, 0));
     BeginCommand.RaiseCanExecuteChanged();
     CancelCommand.RaiseCanExecuteChanged();
     DoneCommand.RaiseCanExecuteChanged();
     NextCommand.RaiseCanExecuteChanged();
 }
Esempio n. 21
0
 public BuffCommandInfo GetSubcommand(byte commandSeq)
 {
     if (CommandSequence == commandSeq)
     {
         return(this);
     }
     return(NextCommand?.GetSubcommand(commandSeq));
 }
Esempio n. 22
0
        public void Run_ShouldDontThrowExceptions()
        {
            var command = new NextCommand();

            _nextHandler.Run(command);

            _taskRepository.Verify(_ => _.GetAll(), Times.Once);
        }
Esempio n. 23
0
 private void RaiseCommandCanExecuteChanged()
 {
     PlayCommand.RaiseCanExecuteChanged();
     PauseCommand.RaiseCanExecuteChanged();
     StopCommand.RaiseCanExecuteChanged();
     NextCommand.RaiseCanExecuteChanged();
     PreviousCommand.RaiseCanExecuteChanged();
     RaisePropertyChanged(nameof(CurrentMedia));
 }
Esempio n. 24
0
        public LoginViewModel()
        {
            IsLoading = Visibility.Collapsed;

            Messenger.Default.Register <GenericMessage <string> >(this, MessengerTokens.PressEnterToLoginToken, act =>
            {
                NextCommand.Execute(null);
            });
        }
Esempio n. 25
0
        protected override void OnModelChanged()
        {
            NextCommand.RaiseCanExecuteChanged();
            PreviousCommand.RaiseCanExecuteChanged();
            FirstCommand.RaiseCanExecuteChanged();
            LastCommand.RaiseCanExecuteChanged();

            RaisePropertyChanged(nameof(TotalPages));
        }
Esempio n. 26
0
        /// <summary>
        /// Adds a command to the command sequence, linking the previous command's damage information.
        /// </summary>
        public void AddCommandToChainWithDamage(AbilityCommandInfo slaveCommand)
        {
            if (CommandSequence == 0)
            {
                if (NextCommand == null || slaveCommand.CommandSequence == CommandSequence)
                {
                    NextCommand = slaveCommand;
                    slaveCommand.LastCommand = this;
                    if (DamageInfo != null)
                    {
                        slaveCommand.DamageInfo = DamageInfo.Clone();
                    }
                    else
                    {
                        slaveCommand.DamageInfo = LastCommand.DamageInfo.Clone();
                    }
                }
                else
                {
                    NextCommand.AddCommandToChainWithDamage(slaveCommand);
                }
            }
            else
            {
                if (slaveCommand.CommandSequence < CommandSequence)
                {
                    LastCommand.NextCommand  = slaveCommand;
                    slaveCommand.LastCommand = LastCommand;
                    LastCommand = slaveCommand;
                    slaveCommand.NextCommand = this;

                    if (slaveCommand.LastCommand.DamageInfo != null)
                    {
                        slaveCommand.DamageInfo = slaveCommand.LastCommand.DamageInfo.Clone();
                    }
                }

                else if (NextCommand == null)
                {
                    NextCommand = slaveCommand;
                    slaveCommand.LastCommand = this;

                    if (DamageInfo != null)
                    {
                        slaveCommand.DamageInfo = DamageInfo.Clone();
                    }
                    else
                    {
                        slaveCommand.DamageInfo = LastCommand.DamageInfo.Clone();
                    }
                }
                else
                {
                    NextCommand.AddCommandToChainWithDamage(slaveCommand);
                }
            }
        }
Esempio n. 27
0
 private void StartExecute(object o)
 {
     HockeyClient.Current.TrackEvent("Start");
     History.Clear();
     Next();
     NextCommand.OnCanExecuteChanged();
     StopCommand.OnCanExecuteChanged();
     ((Button)o)?.Focus(FocusState.Programmatic);
 }
Esempio n. 28
0
        private void NotifyCanExecuteCommands()
        {
            if (NextCommand == null || SaveCommand == null)
            {
                return;
            }

            NextCommand.NotifyCanExecuteChanged();
            SaveCommand.NotifyCanExecuteChanged();
        }
Esempio n. 29
0
        private void SetFrameContent()
        {
            var item = this.PrevViewStack.Pop();

            this.FrameContent = item;
            this.NextViewStack.Push(item);
            CompleteCommand.RaiseCanExecuteChanged();
            PreviousCommand.RaiseCanExecuteChanged();
            NextCommand.RaiseCanExecuteChanged();
        }
Esempio n. 30
0
        public ValidationViewModel()
        {
            // null is success(have no error), string is error message
            ValidationData = new ReactiveProperty <string>()
                             .SetValidateNotifyError((string s) => !string.IsNullOrEmpty(s) && s.Cast <char>().All(Char.IsUpper) ? null : "not all uppercase");

            // async validation
            // first argument is self observable sequence
            // null is success(have no error), IEnumerable is error messages
            ValidationNotify = new ReactiveProperty <string>("foo!", ReactivePropertyMode.RaiseLatestValueOnSubscribe)
                               .SetValidateNotifyError(self => self
                                                       .Delay(TimeSpan.FromSeconds(3)) // asynchronous validation...
                                                       .Select(s => string.IsNullOrEmpty(s) ? null : "not empty string"));

            // both validation
            ValidationBoth = new ReactiveProperty <string>()
                             .SetValidateNotifyError(s => !string.IsNullOrEmpty(s) && s.Cast <char>().All(Char.IsLower) ? null : "not all lowercase")
                             .SetValidateNotifyError(self => self
                                                     .Delay(TimeSpan.FromSeconds(1)) // asynchronous validation...
                                                     .Select(s => string.IsNullOrEmpty(s) || s.Length <= 5 ? null : (IEnumerable) new[] { "length 5" }));

            // Validation result is pushed to ObserveErrors
            var errors = new[]
            {
                ValidationData.ObserveErrorChanged,
                ValidationBoth.ObserveErrorChanged,
                ValidationNotify.ObserveErrorChanged
            }
            .CombineLatest();

            // Use OfType, choose error source
            ErrorInfo = errors
                        .SelectMany(x => x)
                        .Where(x => x != null)
                        .Select(x => x.OfType <string>())
                        .Select(x => x.FirstOrDefault())
                        .ToReactiveProperty();

            // Validation is view initialized not run in default.
            // If want to validate on view initialize,
            // use ReactivePropertyMode.RaiseLatestValueOnSubscribe to ReactiveProperty
            // that mode is validate values on initialize.
            NextCommand =
                new[]
            {
                ValidationData.ObserveHasErrors,
                ValidationBoth.ObserveHasErrors,
                ValidationNotify.ObserveHasErrors
            }
            .CombineLatestValuesAreAllFalse()
            .ToReactiveCommand();
            this.AlertMessage = NextCommand.Select(_ => "Can go to next!").ToReactiveProperty(
                initialValue: "Can go to next!",
                mode: ReactivePropertyMode.None);
        }