public ImportModuleViewModel(IStateManager state_manager,
IImportController import_controller,
ApplicationNavigationPartViewModel application_navigation_part,
ToolsNavigationPartViewModel tools_navigation_part)
{
this.state_manager = state_manager;
this.import_controller = import_controller;
ApplicationNavigationPart = application_navigation_part;
ToolsNavigationPart = tools_navigation_part;
this.WhenAnyValue(x => x.FullFilename)
.Subscribe(x => Filename = Path.GetFileName(x));
OpenFileCommand = ReactiveCommand.Create(OpenFile);
var have_imported_books = this.WhenAny(x => x.Books, x => x.Value != null && x.Value.Any());
ImportBooksCommand = ReactiveCommand.Create(ImportBooks, have_imported_books);
var have_shelves = this.WhenAny(x => x.Shelves, x => x.Value != null && x.Value.Any());
SelectAllShelvesCommand = ReactiveCommand.Create(() => Shelves.Apply(s => s.Selected = true), have_shelves);
DeselectAllShelvesCommand = ReactiveCommand.Create(() => Shelves.Apply(s => s.Selected = false), have_shelves);
}