public TaskBoardViewModel(IRepositoryProvider repositoryProvider, IEventAggregator bus, ICommandResolver commandResolver)
{
_repositoryProvider = repositoryProvider;
_bus = bus;
_commandResolver = commandResolver;
Tasks = new SortableReactiveCollection<TaskViewModel>();
Tasks.ItemChanged
.Throttle(TimeSpan.FromSeconds(5))
.Select(c => c.Sender)
.Where(c => _repository != null)
.Where(task => !task.IsEditing)
.SubscribeOn(RxApp.DeferredScheduler)
.Subscribe(_ => OnSaveAllTasks(null));
Tasks.ItemChanged
.Where(c => c.PropertyName == "IsSelected")
.SubscribeOn(RxApp.DeferredScheduler)
.Select(c => c.Sender)
.Subscribe(IsSelectedChanged);
Tasks.ItemChanged
.Where(c => c.PropertyName == "State")
.SubscribeOn(RxApp.DeferredScheduler)
.Select(c => c.Sender)
.Subscribe(StateChanged);
Tasks.ChangeTrackingEnabled = true;
_bus.ListenOnScheduler<DatabaseChanged>(OnDatabaseChanged);
_bus.ListenOnScheduler<CreateNewTask>(OnCreateNewTask);
_bus.ListenOnScheduler<CreateNewSubTask>(OnCreateNewSubTask);
_bus.ListenOnScheduler<SaveAllTasks>(OnSaveAllTasks);
_bus.ListenOnScheduler<ReloadAllTasks>(evt => Reload());
_bus.ListenOnScheduler<ReSort>(evt => Reorder());
_bus.ListenOnScheduler<CollapseAll>(evt => OnCollapseAll());
_bus.AddSource(Tasks.PropertyOnAnyChanged(vm => vm.State)
.Select(_ => new TaskStateChanged()));
DragCommand = new ReactiveCommand();
DragCommand.OfType<DragCommandArgs>().Subscribe(OnNext);
}