 	override open func invalidateLayout(with context: UICollectionViewLayoutInvalidationContext) {
 		super.invalidateLayout(with: context)
 		guard let collectionView = collectionView else { return }
+
 		// invalidate layout to center first and last
-		
 		let currentCollectionViewSize = collectionView.bounds.size
 		if !currentCollectionViewSize.equalTo(lastCollectionViewSize) || lastScrollDirection != scrollDirection {
 			let inset: CGFloat

		}
	}
	
	public func scrollToPage(index: Int, animated: Bool) {
		guard let collectionView = collectionView else { return }
		

		collectionView.setContentOffset(proposedContentOffset, animated: shouldAnimate)
	}
	
	/// Calculates the current centered page.
	public var currentCenteredPage: Int? {
		guard let collectionView = collectionView else { return nil }
		let currentCenteredPoint = CGPoint(x: collectionView.contentOffset.x + collectionView.bounds.width/2, y: collectionView.contentOffset.y + collectionView.bounds.height/2)
