 			galleryCell.namesLabel.text = drawing.artistDisplayNames
 			galleryCell.dateLabel.text = dateFormatter.stringFromDate(NSDate(timeIntervalSinceReferenceDate: drawing.date))
 			galleryCell.deleteButtonVisible = self.editMode
+
+			galleryCell.indexInCollection = indexPath.item
 
 			galleryCell.onLongPress = {
 				[weak self]

	@IBOutlet weak var imageView: ImagePresenterView!
	@IBOutlet weak var namesLabel: UILabel!
	@IBOutlet weak var dateLabel: UILabel!

	var onLongPress:((( cell:GalleryCollectionViewCell )->())?)
	var onDeleteButtonTapped:((( cell:GalleryCollectionViewCell )->())?)

		}

		let now = NSDate().timeIntervalSinceReferenceDate
		let cycle = now / WigglePhaseDuration
		let sign = (indexInCollection % 2 == 0) ? +1.0 : -1.0
		let phase = sin(cycle * M_PI + _cycleOffset * M_PI ) * sign
		let angle = CGFloat(phase * WiggleAngleMax)
		let layer = self.layer
		UIView.performWithoutAnimation { () -> Void in
