private void OnSongsCollectionChanged(object sender, SongCollectionChangedEventArgs e)
{
MobileDebug.Service.WriteEvent("PlaylistSubscribtionHandler.OnSongsCollectionChanged", (sender as ISongCollection)?.Parent?.Name);
Unsubscribe(e.GetRemoved());
Subscribe(e.GetAdded());
SongCollectionChanged?.Invoke(this, new SubscriptionsEventArgs <ISongCollection, SongCollectionChangedEventArgs>(sender, e));
}
private void Parent_CollectionChanged(object sender, SongCollectionChangedEventArgs e)
{
List <ChangeCollectionItem <Song> > adds = new List <ChangeCollectionItem <Song> >();
foreach (Song addSong in e.GetAdded())
{
int index = ran.Next(Count - e.RemovedSongs.Length + adds.Count);
adds.Add(new ChangeCollectionItem <Song>(index, addSong));
}
Change(e.GetRemoved(), adds);
}
public void Change(IEnumerable <Song> removes, IEnumerable <Song> adds)
{
//Song oldCurrentSong, newCurrentSong;
//newCurrentSong = oldCurrentSong = Parent.CurrentSongFileName;
//int currentSongIndex = list.IndexOf(oldCurrentSong);
Song[] removeArray = removes?.ToArray() ?? new Song[0];
Song[] addArray = adds?.ToArray() ?? new Song[0];
List <ChangeCollectionItem <Song> > removeChanges = new List <ChangeCollectionItem <Song> >();
List <ChangeCollectionItem <Song> > addChanges = new List <ChangeCollectionItem <Song> >();
foreach (Song song in removeArray)
{
int index = list.IndexOf(song);
if (index == -1)
{
continue;
}
list.RemoveAt(index);
removeChanges.Add(new ChangeCollectionItem <Song>(index, song));
}
foreach (Song song in addArray)
{
int index = list.IndexOf(song);
if (index == -1)
{
continue;
}
list.RemoveAt(index);
removeChanges.Add(new ChangeCollectionItem <Song>(index, song));
}
foreach (Song song in addArray)
{
addChanges.Add(new ChangeCollectionItem <Song>(Count, song));
list.Add(song);
song.Parent = this;
}
SongCollectionChangedEventArgs args = new SongCollectionChangedEventArgs(addChanges.ToArray(), removeChanges.ToArray());
Changed?.Invoke(this, args);
OnPropertyChanged(nameof(Count));
}
private void Parent_CollectionChanged(object sender, SongCollectionChangedEventArgs e)
{
Song[] ordered = GetOrdered(Parent).ToArray();
Change(e.GetRemoved(), e.GetAdded().Select(s => new ChangeCollectionItem <Song>(Array.IndexOf(ordered, s), s)));
}
private void Parent_CollectionChanged(object sender, SongCollectionChangedEventArgs e)
{
Song currentSong = Parent.Parent.CurrentSong;
int shuffleIndex = GetCurrentSongIndex(Parent.Count);
int shuffleCount = GetCount(Parent.Count);
int currentSongIndex = IndexOf(currentSong);
List <Song> removes = new List <Song>();
List <ChangeCollectionItem <Song> > adds = new List <ChangeCollectionItem <Song> >();
foreach (Song remove in e.GetRemoved())
{
int index = IndexOf(remove);
if (index == -1)
{
continue;
}
Song add = GetRandomSong(Parent, null, adds.Select(c => c.Item));
ChangeCollectionItem <Song> addChange = new ChangeCollectionItem <Song>(index, add);
removes.Add(remove);
adds.Add(addChange);
}
for (int i = currentSongIndex - 1; i >= shuffleIndex; i++)
{
Song remove = this.ElementAt(i);
if (!removes.Contains(remove))
{
removes.Add(remove);
}
else
{
adds.Remove(adds.FirstOrDefault(c => c.Index == i));
}
}
for (int i = currentSongIndex; i < shuffleIndex; i++)
{
Song add = GetRandomSong(Parent, removes, adds.Select(c => c.Item));
ChangeCollectionItem <Song> addChange = new ChangeCollectionItem <Song>(i, add);
adds.Add(addChange);
}
while (Parent.Count - removes.Count + adds.Count > shuffleCount)
{
if (!adds.Remove(adds.FirstOrDefault(c => c.Index > shuffleIndex)))
{
removes.Add(this.Except(removes).LastOrDefault());
}
}
while (Parent.Count - removes.Count + adds.Count < shuffleCount)
{
int index = Parent.Count - removes.Count + adds.Count;
Song add = GetRandomSong(Parent, removes, adds.Select(c => c.Item));
ChangeCollectionItem <Song> addChange = new ChangeCollectionItem <Song>(index, add);
adds.Add(addChange);
}
}
