private void OnSourceResultsChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add ||
e.Action == NotifyCollectionChangedAction.Replace)
{
foreach (AlbumArt albumArt in e.NewItems)
{
CombinedResults.Add(albumArt);
}
}
if (e.Action == NotifyCollectionChangedAction.Remove ||
e.Action == NotifyCollectionChangedAction.Replace)
{
foreach (AlbumArt albumArt in e.OldItems)
{
//TODO: Does this need a TryRemoveResultFromCombinedResults helper?
CombinedResults.Remove(albumArt);
}
}
//No change needed for move
if (e.Action == NotifyCollectionChangedAction.Reset)
{
//For reset, there is no way of knowing that the items removed are,
//so recreate the whole thing
RecreateCombinedResults();
}
}
private void RecreateCombinedResults()
{
CombinedResults.Clear();
foreach (Source source in this)
{
foreach (AlbumArt albumArt in source.Results)
{
CombinedResults.Add(albumArt);
}
}
}
private void UnhookSource(Source source)
{
if (!AllEnabled.HasValue)
{
//It's possible that all other sources have the same value now
RecalculateAllEnabled();
}
source.PropertyChanged -= new PropertyChangedEventHandler(OnSourcePropertyChanged);
source.Results.CollectionChanged -= new NotifyCollectionChangedEventHandler(OnSourceResultsChanged);
foreach (AlbumArt albumArt in source.Results)
{
CombinedResults.Remove(albumArt);
}
}
private void HookSource(Source source)
{
if (Count == 1) //First item to be inserted
{
AllEnabled = source.IsEnabled;
}
else if (AllEnabled.HasValue && AllEnabled.Value != source.IsEnabled)
{
AllEnabled = null;
}
source.PropertyChanged += new PropertyChangedEventHandler(OnSourcePropertyChanged);
source.Results.CollectionChanged += new NotifyCollectionChangedEventHandler(OnSourceResultsChanged);
foreach (AlbumArt albumArt in source.Results)
{
CombinedResults.Add(albumArt);
}
}
