private void NavigateLetter(string indexLetter)
{
if (indexLetter is null)
{
return;
}
_filter = PerformerFilters.FilterByFirstLetter;
ActivateUpperPanel(false);
IndexLetter = indexLetter;
ActivateUpperPanel(true);
}
/// <summary>
/// Select performers whose name starts with string FirstLetter (or not a letter - "Other" case)
/// </summary>
private async Task SelectPerformersByFirstLetterAsync()
{
if (_filter != PerformerFilters.FilterByFirstLetter || _filterCriterion != IndexLetter)
{
_selectedPage = 0;
_filter = PerformerFilters.FilterByFirstLetter;
_filterCriterion = IndexLetter;
}
var performers = await
_performerService.GetPerformersByFirstLetterAsync(
IndexLetter, _selectedPage, PerformersPerPage);
await FillPerformerViewModelsAsync(performers);
}
/// <summary>
/// Select performers whose name contains the search pattern PerformerPattern
/// (specified in lower navigation panel)
/// </summary>
private async Task SelectPerformersByPatternAsync()
{
ActivateUpperPanel(false);
if (_filter != PerformerFilters.FilterByPattern || _filterCriterion != PerformerPattern)
{
_selectedPage = 0;
_filter = PerformerFilters.FilterByPattern;
_filterCriterion = PerformerPattern;
}
var performers = await
_performerService.GetPerformersBySubstringAsync(
PerformerPattern, _selectedPage, PerformersPerPage);
await FillPerformerViewModelsAsync(performers);
}
public MainViewModel(IUnitOfWork unitOfWork,
IPerformerService performerService,
IAlbumService albumService,
IRateCalculator rateCalculator)
{
Guard.AgainstNull(unitOfWork);
Guard.AgainstNull(performerService);
Guard.AgainstNull(albumService);
Guard.AgainstNull(rateCalculator);
_unitOfWork = unitOfWork;
_performerService = performerService;
_albumService = albumService;
_rateCalculator = rateCalculator;
// setting up all commands (quite a lot of them)
GeneralViewCommand = new RelayCommand(() =>
{
if (SelectedAlbum != null)
{
ViewSelectedAlbum();
}
else
{
ViewSelectedPerformer();
}
});
GeneralDeleteCommand = new RelayCommand(() =>
{
if (SelectedAlbum != null)
{
RemoveSelectedAlbumAsync();
}
else
{
RemoveSelectedPerformerAsync();
}
});
GeneralEditCommand = new RelayCommand(() =>
{
if (SelectedAlbum != null)
{
EditAlbum();
}
else
{
EditPerformer();
}
});
IndexLetterCommand = new RelayCommand(param =>
{
_filter = PerformerFilters.FilterByFirstLetter;
ActivateUpperPanel(false);
IndexLetter = param.ToString();
ActivateUpperPanel(true);
});
IndexPageCommand = new RelayCommand(NavigatePage);
ViewPerformerCommand = new RelayCommand(ViewSelectedPerformer);
EditPerformerCommand = new RelayCommand(EditPerformer);
EditCountriesCommand = new RelayCommand(EditCountries);
EditMusiciansCommand = new RelayCommand(() => { });
ViewAlbumCommand = new RelayCommand(ViewSelectedAlbum);
EditAlbumCommand = new RelayCommand(EditAlbum);
AddPerformerCommand = new RelayCommand(AddPerformerAsync);
AddAlbumCommand = new RelayCommand(AddAlbumAsync);
DeletePerformerCommand = new RelayCommand(RemoveSelectedPerformerAsync);
DeleteAlbumCommand = new RelayCommand(RemoveSelectedAlbumAsync);
BeginMoveAlbumCommand = new RelayCommand(BeginMoveAlbum);
MoveAlbumCommand = new RelayCommand(MoveAlbum);
PerformerSearchCommand = new RelayCommand(async() => await SelectPerformersByPatternAsync());
StartRadioCommand = new RelayCommand(async() => await StartRadioAsync());
StatsCommand = new RelayCommand(ShowStats);
SettingsCommand = new RelayCommand(ShowSettings);
HelpCommand = new RelayCommand(ShowHelp);
// create navigation panel
CreateUpperNavigationPanel();
// and select the initial set of performers (starting with "A")
IndexLetter = "A";
}