private SongViewModel LookupSong(SongModel song)
{
if (song == null)
{
return(null);
}
if (SongLookupMap.ContainsKey(song.SongId))
{
return(SongLookupMap[song.SongId]);
}
else
{
ArtistViewModel artist = LookupArtistById(song.ArtistId);
AlbumViewModel album = LookupAlbumById(song.AlbumId);
SongViewModel newSongViewModel = new SongViewModel(song, artist, album);
SongLookupMap.Add(newSongViewModel.SongId, newSongViewModel);
SongCollection.Add(newSongViewModel, newSongViewModel.SortName);
FlatSongCollection.Add(newSongViewModel);
if (LibraryLoaded)
{
NotifyPropertyChanged(Properties.IsEmpty);
}
return(newSongViewModel);
}
}
private void HandleAllSongsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Reset)
{
foreach (SongViewModel oldSongViewModel in FlatSongCollection)
{
oldSongViewModel.Album.Songs.Remove(oldSongViewModel);
oldSongViewModel.Artist.Songs.Remove(oldSongViewModel);
SongCollection.Remove(oldSongViewModel, oldSongViewModel.SortName);
FlatSongCollection.Remove(oldSongViewModel);
SongLookupMap.Remove(oldSongViewModel.SongId);
}
}
else
{
if (e.OldItems != null)
{
foreach (SongModel oldSong in e.OldItems)
{
SongViewModel oldSongViewModel = LookupSong(oldSong);
SongCollection.Remove(oldSongViewModel, oldSongViewModel.SortName);
FlatSongCollection.Remove(oldSongViewModel);
SongLookupMap.Remove(oldSongViewModel.SongId);
oldSongViewModel.Album.Songs.Remove(oldSongViewModel);
oldSongViewModel.Artist.Songs.Remove(oldSongViewModel);
}
}
if (e.NewItems != null)
{
foreach (SongModel newSong in e.NewItems)
{
LookupSong(newSong);
}
}
}
if (LibraryLoaded)
{
NotifyPropertyChanged(Properties.IsEmpty);
ShuffleAllSongs.RaiseExecuteChanged();
}
}
