public ActivityInventoryViewModel()
{
Activities = new ObservableCollection <Activity>();
var activityPropertyChanged = new ObservableEventHandler <Activity, PropertyChangedEventArgs>();
var activitiesCollectionChanged = new Utilities.ObservableEventHandler <NotifyCollectionChangedEventArgs>();
Activities.CollectionChanged += activitiesCollectionChanged.Handler;
activitiesCollectionChanged.Where(e => e.EventArgs.Action == NotifyCollectionChangedAction.Add)
.SelectMany(e => e.EventArgs.NewItems.Cast <Activity>())
.Subscribe(a => a.PropertyChanged += activityPropertyChanged.Handler);
activitiesCollectionChanged.Where(e => e.EventArgs.Action == NotifyCollectionChangedAction.Remove)
.SelectMany(e => e.EventArgs.OldItems.Cast <Activity>())
.Subscribe(a => a.PropertyChanged -= activityPropertyChanged.Handler);
activitiesCollectionChanged.Select(e => Unit.Default)
.Merge(activityPropertyChanged.Where(e => e.EventArgs.PropertyName == "ExpectedEffort").Select(e => Unit.Default))
.Subscribe(u => ExpectedEffortSum = Activities.Select(a => a.ExpectedEffort).Sum());
activitiesCollectionChanged.Select(e => Unit.Default)
.Merge(activityPropertyChanged.Where(e => e.EventArgs.PropertyName == "ActualEffort").Select(e => Unit.Default))
.Subscribe(u => ActualEffortSum = Activities.Select(a => a.ActualEffort).Sum());
var selectedActivitiesNotEmpty = new Func <bool>(() => !EnumerableExtensions.IsNullOrEmpty(SelectedActivities));
DeleteActivityCommand = new RelayCommand(() => SelectedActivities.ForEach(DeleteActivity), selectedActivitiesNotEmpty);
ArchiveActivityCommand = new RelayCommand(() => SelectedActivities.ForEach(ArchiveActivity), selectedActivitiesNotEmpty);
IncreaseActualEffortCommand = new RelayCommand(() => SelectedActivities.ForEach(IncreaseActualEffort), selectedActivitiesNotEmpty);
DecreaseActualEffortCommand = new RelayCommand(() => SelectedActivities.ForEach(DecreaseActualEffort), selectedActivitiesNotEmpty);
EditActivityCommand = new RelayCommand(() => EditActivity(SelectedActivities[0]), selectedActivitiesNotEmpty);
}
public static IObservable <TEvent> Observable <TEvent>(this EventBus eventBus) where TEvent : DomainEvent
{
return(System.Reactive.Linq.Observable.Create <TEvent>(observer =>
{
var handler = new ObservableEventHandler <TEvent>(async evt =>
{
observer.OnNext(evt);
});
var subscribtion = eventBus.Subscribe(handler);
return subscribtion;
}));
}
public EventBindingSubscriber OnRaised(ObservableEventHandler callback)
{
binding.Property.Raised += callback;
return(this);
}