void Add(NotifyCollectionChangedEventArgs args)
{
var startIndex = args.NewStartingIndex > -1 ? args.NewStartingIndex : _groupSource.IndexOf(args.NewItems[0]);
var count = args.NewItems.Count;
// Adding a group will change the section index for all subsequent groups, so the easiest thing to do
// is to reset all the group tracking to get it up-to-date
ResetGroupTracking();
if (NotLoadedYet())
{
_collectionView.ReloadData();
return;
}
if (_collectionView.NumberOfSections() == 0)
{
// Okay, we're going from completely empty to more than 0 items; there's an iOS bug which apparently
// will just crash if we call InsertItems here, so we have to do ReloadData.
_collectionView.ReloadData();
return;
}
_collectionView.InsertSections(CreateIndexSetFrom(startIndex, count));
}
void Add(NotifyCollectionChangedEventArgs args)
{
var startIndex = args.NewStartingIndex > -1 ? args.NewStartingIndex : _groupSource.IndexOf(args.NewItems[0]);
var count = args.NewItems.Count;
// Adding a group will change the section index for all subsequent groups, so the easiest thing to do
// is to reset all the group tracking to get it up-to-date
ResetGroupTracking();
_collectionView.InsertSections(CreateIndexSetFrom(startIndex, count));
}
void Add(NotifyCollectionChangedEventArgs args)
{
var startIndex = args.NewStartingIndex > -1 ? args.NewStartingIndex : _itemsSource.IndexOf(args.NewItems[0]);
var count = args.NewItems.Count;
_collectionView.PerformBatchUpdates(() =>
{
if (!_grouped && _collectionView.NumberOfSections() != GroupCount)
{
// We had an empty non-grouped list, and now we're trying to add an item;
// we need to give it a section as well
_collectionView.InsertSections(new NSIndexSet(0));
}
_collectionView.InsertItems(CreateIndexesFrom(startIndex, count));
}, null);
}
async Task Add(NotifyCollectionChangedEventArgs args)
{
if (ReloadRequired())
{
await Reload();
return;
}
var startIndex = args.NewStartingIndex > -1 ? args.NewStartingIndex : _groupSource.IndexOf(args.NewItems[0]);
var count = args.NewItems.Count;
// Adding a group will change the section index for all subsequent groups, so the easiest thing to do
// is to reset all the group tracking to get it up-to-date
ResetGroupTracking();
// Queue up the updates to the UICollectionView
BatchUpdate(() => _collectionView.InsertSections(CreateIndexSetFrom(startIndex, count)));
}