void EmptyCollectionViewReloadWorkaround()
{
var enumerator = _itemsView.ItemsSource.GetEnumerator();
if (!enumerator.MoveNext())
{
// The source we're updating to is empty, so we can just update as normal; it won't crash
UpdateItemsSourceAndReload();
}
else
{
// Grab the first item from the new ItemsSource and create a usable source for the UICollectionView
// from that
var firstItem = new List <object> {
enumerator.Current
};
_itemsSource = ItemsSourceFactory.Create(firstItem, CollectionView);
// Insert that item into the UICollectionView
// TODO ezhart When we implement grouping, this will need to be the index of the first actual item
// Which might not be zero,zero if we have empty groups
var indexesToInsert = new NSIndexPath[1] {
NSIndexPath.Create(0, 0)
};
UIView.PerformWithoutAnimation(() =>
{
CollectionView.InsertItems(indexesToInsert);
});
// Okay, from now on we can just call ReloadData and things will work fine
_safeForReload = true;
UpdateItemsSource();
}
}
public ItemsViewController(ItemsView itemsView, ItemsViewLayout layout) : base(layout)
{
_itemsView = itemsView;
_itemsSource = ItemsSourceFactory.Create(_itemsView.ItemsSource, CollectionView);
UpdateLayout(layout);
}
protected override IItemsViewSource CreateItemsViewSource()
{
var itemsSource = ItemsSourceFactory.CreateForCarouselView(Carousel.ItemsSource, this, Carousel.Loop);
_carouselViewLoopManager?.SetItemsSource(itemsSource);
SubscribeCollectionItemsSourceChanged(itemsSource);
return(itemsSource);
}
public CollectionViewController(ItemsView itemsView, ItemsViewLayout layout) : base(layout)
{
_itemsView = itemsView;
_itemsSource = ItemsSourceFactory.Create(_itemsView.ItemsSource, CollectionView);
_layout = layout;
_layout.GetPrototype = GetPrototype;
_layout.UniformSize = false; // todo hartez Link this to ItemsView.ItemSizingStrategy hint
}
protected override IItemsViewSource CreateItemsViewSource()
{
// Use the BindableProperty here (instead of _isGroupingEnabled) because the cached value might not be set yet
if (ItemsView.IsGrouped)
{
return(ItemsSourceFactory.CreateGrouped(ItemsView.ItemsSource, this));
}
return(base.CreateItemsViewSource());
}
public ItemsViewController(ItemsView itemsView, ItemsViewLayout layout) : base(layout)
{
_itemsView = itemsView;
_itemsSource = ItemsSourceFactory.Create(_itemsView.ItemsSource, CollectionView);
// If we already have data, the UICollectionView will have items and we'll be safe to call
// ReloadData if the ItemsSource changes in the future (see UpdateItemsSource for more).
_safeForReload = _itemsSource?.Count > 0;
UpdateLayout(layout);
}
protected virtual IItemsViewSource CreateItemsViewSource()
{
return(ItemsSourceFactory.Create(ItemsView.ItemsSource, this));
}
protected virtual IItemsViewSource CreateItemsViewSource()
{
return(ItemsSourceFactory.Create(ItemsView.ItemsSource, CollectionView));
}
void UpdateItemsSourceAndReload()
{
_itemsSource = ItemsSourceFactory.Create(_itemsView.ItemsSource, CollectionView);
CollectionView.ReloadData();
CollectionView.CollectionViewLayout.InvalidateLayout();
}