namespace AppKit
{
    [Introduced(PlatformName.MacOSX, 10, 11, PlatformArchitecture.All, null)]
    [Model]
    [Protocol]
    [Register("NSCollectionViewDelegateFlowLayout", false)]
    public class NSCollectionViewDelegateFlowLayout : NSObject, INSCollectionViewDelegate, INSCollectionViewDelegateFlowLayout, INativeObject, IDisposable
    {
        [BindingImpl(BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
        [Export("collectionView:layout:referenceSizeForHeaderInSection:")]
        public virtual CGSize ReferenceSizeForHeader(NSCollectionView! collectionView, NSCollectionViewLayout! collectionViewLayout, nint section);
    }
}