private void OnPlaylistsCollectionChanged(object sender, PlaylistCollectionChangedEventArgs e)
{
Unsubscribe(e.GetRemoved());
Subscribe(e.GetAdded());
PlaylistCollectionChanged?.Invoke(this, new SubscriptionsEventArgs <IPlaylistCollection, PlaylistCollectionChangedEventArgs>(sender, e));
}
public void Change(IEnumerable <IPlaylist> removes, IEnumerable <IPlaylist> adds)
{
IPlaylist[] removeArray = removes?.ToArray() ?? new IPlaylist[0];
IPlaylist[] addArray = adds?.ToArray() ?? new IPlaylist[0];
List <ChangeCollectionItem <IPlaylist> > removeChanges = new List <ChangeCollectionItem <IPlaylist> >();
List <ChangeCollectionItem <IPlaylist> > addChanges = new List <ChangeCollectionItem <IPlaylist> >();
foreach (IPlaylist playlist in removeArray)
{
int index = IndexOf(playlist);
if (index == -1)
{
continue;
}
removeChanges.Add(new ChangeCollectionItem <IPlaylist>(index, playlist));
list.RemoveAt(index);
}
foreach (IPlaylist playlist in addArray.OrderBy(p => p.AbsolutePath))
{
if (this.Contains(playlist))
{
continue;
}
int index = WouldIndexOf(this.Select(p => p.AbsolutePath), playlist.AbsolutePath);
addChanges.Add(new ChangeCollectionItem <IPlaylist>(index, playlist));
list.Insert(index, playlist);
playlist.Parent = this;
}
if (removeChanges.Count == 0 && addChanges.Count == 0)
{
return;
}
PlaylistCollectionChangedEventArgs args = new PlaylistCollectionChangedEventArgs(addChanges.ToArray(), removeChanges.ToArray());
Changed?.Invoke(this, args);
OnPropertyChanged(nameof(Count));
UpdateCurrentPlaylist();
}