protected virtual void SetUpNewElement(ItemsView newElement)
{
if (newElement == null)
{
return;
}
UpdateLayout();
ItemsViewController = CreateController(newElement, _layout);
if (Forms.IsiOS11OrNewer)
{
// We set this property to keep iOS from trying to be helpful about insetting all the
// CollectionView content when we're in landscape mode (to avoid the notch)
// The SetUseSafeArea Platform Specific is already taking care of this for us
// That said, at some point it's possible folks will want a PS for controlling this behavior
ItemsViewController.CollectionView.ContentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentBehavior.Never;
}
SetNativeControl(ItemsViewController.View);
ItemsViewController.CollectionView.BackgroundColor = UIColor.Clear;
ItemsViewController.UpdateEmptyView();
ItemsViewController.UpdateFooterView();
ItemsViewController.UpdateHeaderView();
UpdateHorizontalScrollBarVisibility();
UpdateVerticalScrollBarVisibility();
// Listen for ScrollTo requests
newElement.ScrollToRequested += ScrollToRequested;
}
protected virtual void SetUpNewElement(ItemsView newElement)
{
if (newElement == null)
{
return;
}
_layout = SelectLayout(newElement.ItemsLayout);
ItemsViewController = CreateController(newElement, _layout);
SetNativeControl(ItemsViewController.View);
ItemsViewController.CollectionView.BackgroundColor = UIColor.Clear;
ItemsViewController.UpdateEmptyView();
// Listen for ScrollTo requests
newElement.ScrollToRequested += ScrollToRequested;
}
protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
_disposed = true;
if (disposing)
{
TearDownOldElement(Element);
ItemsViewController?.Dispose();
ItemsViewController = null;
}
base.Dispose(disposing);
}
public override void CellDisplayingEnded(UICollectionView collectionView, UICollectionViewCell cell, NSIndexPath indexPath)
{
if (ItemsViewLayout.ScrollDirection == UICollectionViewScrollDirection.Horizontal)
{
var actualWidth = collectionView.ContentSize.Width - collectionView.Bounds.Size.Width;
if (collectionView.ContentOffset.X >= actualWidth || collectionView.ContentOffset.X < 0)
{
return;
}
}
else
{
var actualHeight = collectionView.ContentSize.Height - collectionView.Bounds.Size.Height;
if (collectionView.ContentOffset.Y >= actualHeight || collectionView.ContentOffset.Y < 0)
{
return;
}
}
ItemsViewController.PrepareCellForRemoval(cell);
}
public UICollectionViewDelegator(ItemsViewLayout itemsViewLayout, ItemsViewController itemsViewController)
{
ItemsViewLayout = itemsViewLayout;
ItemsViewController = itemsViewController;
}