public EditPlaylistViewModel(IViewModelFactory viewModelFactory, IContentManagerService contentManagerService, IPlaylistViewModel playlistViewModel)
{
PlaylistViewModel = playlistViewModel;
DisplayName = playlistViewModel.Playlist.Name;
HashSet <Track> playlistTracks = new HashSet <Track>(playlistViewModel.Playlist.Tracks.Select(playlistTrack => playlistTrack.Track));
TrackSource = viewModelFactory.MakeViewModel <ITrackSinkViewModel>(contentManagerService.RetrieveTracks()
.Where(track => !playlistTracks.Contains(track))
.Select(track => viewModelFactory.MakeViewModel <ITrackViewModel>(new PlaylistTrack(0, track))),
"Plus");
PlaylistTarget = viewModelFactory.MakeViewModel <ITrackSinkViewModel>(playlistViewModel.Tracks, "Minus");
EventHandler <TracksReleasedEventArgs> MakeAddTracksEventHandler(ITrackSinkViewModel target)
{
return((sender, e) =>
{
target.AddTracks(e.Tracks);
ModifiedTrackCountChanged();
});
}
TrackSource.TracksReleased += MakeAddTracksEventHandler(PlaylistTarget);
PlaylistTarget.TracksReleased += MakeAddTracksEventHandler(TrackSource);
}