private bool IsLast(EditArtistViewModel vm)
{
//var last = this.EditArtistViewModels.Count > 0 ? this.EditArtistViewModels[this.EditArtistViewModels.Count - 1] : null;
//return object.ReferenceEquals(last, s);
return(this._editArtistViewModelsSourceList.Items.LastOrDefault() == vm);
}
//private readonly OrderedDictionary
#endregion
#region ctors
public EditArtistsViewModel(IEnumerable <string> initialStrings)
{
this._stringsSet = new HashSet <string>(initialStrings);
var initialStringViewModels = initialStrings.Select(s => new EditArtistViewModel(s));
this._editArtistViewModelsSourceList = new SourceList <EditArtistViewModel>().DisposeWith(this._disposables);
this._editArtistViewModelsSourceList.AddRange(initialStringViewModels);
this._editArtistViewModelsSourceList
.Connect()
.Bind(out this._editArtistViewModelsROOC)
.DisposeMany()
.Subscribe()
.DisposeWith(this._disposables);
this.WhenSelectedEditArtistViewModelChanged = this.WhenAnyValue(x => x.SelectedEditArtistViewModel).DistinctUntilChanged();
this._hasEditArtistViewModelSelectionOAPH = this.WhenSelectedEditArtistViewModelChanged
.Select(x => x != null)
.DistinctUntilChanged()
.ToProperty(this, nameof(this.HasEditArtistViewModelSelection)
//, true // works
//, false
, scheduler: Scheduler.Immediate
)
.DisposeWith(this._disposables);
this.WhenSelectedEditArtistViewModelChanged.Subscribe(
selectedEAVM =>
{
if (selectedEAVM != null)
{
this.NewArtistName = null;
}
})
.DisposeWith(this._disposables);
this.AddNew = ReactiveCommand.Create(
() =>
{
var newEditArtistViewModel = new EditArtistViewModel(this.NewArtistName);
this.NewArtistName = null;
this._editArtistViewModelsSourceList.Edit(list => list.Add(newEditArtistViewModel));
//this.SelectedEditArtistViewModel = newEditArtistViewModel;
//return newEditArtistViewModel;
},
this.WhenAnyValue(x => x.NewArtistName) /*.Throttle(TimeSpan.FromMilliseconds(200))*/.Select(nan => this.IsValidNewArtistName(nan)))
.DisposeWith(this._disposables);
this.MoveSelectedUp = ReactiveCommand.Create(
() =>
{
var selection = this.SelectedEditArtistViewModel;
this._editArtistViewModelsSourceList.Edit(list =>
{
var oldIndex = list.IndexOf(selection);
if (oldIndex > 0 && list.Remove(selection))
{
list.Insert(oldIndex - 1, selection);
}
});
this.SelectedEditArtistViewModel = selection;
},
this.WhenSelectedEditArtistViewModelChanged.Select(x => x != null && !this.IsFirst(x)))
.DisposeWith(this._disposables);
this.MoveSelectedDown = ReactiveCommand.Create(
() =>
{
var selection = this.SelectedEditArtistViewModel;
this._editArtistViewModelsSourceList.Edit(list =>
{
var oldIndex = list.IndexOf(selection);
if (oldIndex < (list.Count - 1) && list.Remove(selection))
{
list.Insert(oldIndex + 1, selection);
}
});
this.SelectedEditArtistViewModel = selection;
},
this.WhenSelectedEditArtistViewModelChanged.Select(x => x != null && !this.IsLast(x)))
.DisposeWith(this._disposables);
this.TryRemove = ReactiveCommand.Create(
(EditArtistViewModel vm) =>
{
bool wasRemoved = false;
this._editArtistViewModelsSourceList.Edit(list =>
{
wasRemoved = list.Remove(vm);
});
return(wasRemoved);
})
.DisposeWith(this._disposables);
this.RemoveSelected = ReactiveCommand.Create(
() =>
{
this._editArtistViewModelsSourceList.Edit(list =>
{
if (!list.Remove(this.SelectedEditArtistViewModel))
{
// TODO: throw exception if passed element is not contained in the list
}
});
},
this.WhenAnyValue(x => x.SelectedEditArtistViewModel).Select(x => x != null))
.DisposeWith(this._disposables);
}
private bool IsFirst(EditArtistViewModel vm)
{
//var first = this.EditArtistViewModels.Count > 0 ? this.EditArtistViewModels[0] : null;
//return object.ReferenceEquals(first, vm);
return(this._editArtistViewModelsSourceList.Items.FirstOrDefault() == vm);
}