extern NSString *const MZBookshelfCollectionViewLayoutDecorationViewKind;

@class MZBookshelfCollectionViewLayout;

@protocol MZBookshelfCollectionViewLayoutDelegate <UICollectionViewDelegateFlowLayout>
@required
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(MZBookshelfCollectionViewLayout *)collectionViewLayout referenceSizeForDecorationViewForRow:(NSInteger)row inSection:(NSInteger)section;

@optional
- (UIOffset)collectionView:(UICollectionView *)collectionView layout:(MZBookshelfCollectionViewLayout *)collectionViewLayout decorationViewAdjustmentForRow:(NSInteger)row inSection:(NSInteger)section;
@end

@interface MZBookshelfCollectionViewLayout : UICollectionViewFlowLayout
@end

- (void)viewDidLoad
{
    [super viewDidLoad];
	
    MZBookshelfCollectionViewLayout *layout = (id)self.collectionView.collectionViewLayout;
    [layout registerNib:[UINib nibWithNibName:@"MZBookShelfDecorationView" bundle:nil] forDecorationViewOfKind:MZBookshelfCollectionViewLayoutDecorationViewKind];
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(MZBookshelfCollectionViewLayout *)collectionViewLayout referenceSizeForDecorationViewForRow:(NSInteger)row inSection:(NSInteger)section
{
    return CGSizeMake(collectionViewLayout.collectionViewContentSize.width, 30);
}

- (UIOffset)collectionView:(UICollectionView *)collectionView layout:(MZBookshelfCollectionViewLayout *)collectionViewLayout decorationViewAdjustmentForRow:(NSInteger)row inSection:(NSInteger)section
{
    return UIOffsetMake(0, 0);
}