updated MaterialCollectionViewLayout to take scale into account

Sources/MaterialCollectionViewDataSource.swift

@@ -31,7 +31,7 @@
 public protocol MaterialCollectionViewDataSource : MaterialDelegate, UICollectionViewDataSource {
 	/**
 	/// Retrieves the items for the collectionView.
-	- Returns: An Array of MaterialCollectionViewDataSourceItem objects.
+	- Returns: An Array of Arrays of MaterialCollectionViewDataSourceItem objects.
 	*/
-	func items() -> Array<MaterialCollectionViewDataSourceItem>
+	func items() -> Array<Array<MaterialCollectionViewDataSourceItem>>
 }
\ No newline at end of file

Sources/MaterialCollectionViewLayout.swift

@@ -36,22 +36,24 @@ public enum MaterialCollectionViewLayoutScrollDirection {
 }
 
 public class MaterialCollectionViewLayout : UICollectionViewLayout {
-	
 	/// Size of the content.
 	private var contentSize: CGSize = CGSizeZero
 	
 	/// Layout attribute items.
-	private var layoutItems: Array<(UICollectionViewLayoutAttributes, NSIndexPath)>?
+	private var layoutItems: Array<(UICollectionViewLayoutAttributes, NSIndexPath)> = Array<(UICollectionViewLayoutAttributes, NSIndexPath)>()
 	
 	/// Used to calculate the dimensions of the cells.
 	private var offset: CGFloat = 0
 	
 	/// Cell items.
-	private var items: Array<MaterialCollectionViewDataSourceItem>?
+	private var items: Array<Array<MaterialCollectionViewDataSourceItem>>?
 	
 	/// Scroll direction.
 	public var scrollDirection: MaterialCollectionViewLayoutScrollDirection = .Vertical
 	
+	/// Scale of the screen.
+	public var scale: CGFloat = 2
+	
 	/**
 	Retrieves the index paths for the items within the passed in CGRect.
 	- Parameter rect: A CGRect that acts as the bounds to find the items within.
@@ -59,7 +61,7 @@ public class MaterialCollectionViewLayout : UICollectionViewLayout {
 	*/
 	public func indexPathsOfItemsInRect(rect: CGRect) -> Array<NSIndexPath> {
 		var paths: Array<NSIndexPath> = Array<NSIndexPath>()
-		for (attribute, indexPath) in layoutItems! {
+		for (attribute, indexPath) in layoutItems {
 			if CGRectIntersectsRect(rect, attribute.frame) {
 				paths.append(indexPath)
 			}
@@ -69,18 +71,13 @@ public class MaterialCollectionViewLayout : UICollectionViewLayout {
 	
 	public override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? {
 		let attributes: UICollectionViewLayoutAttributes = UICollectionViewLayoutAttributes(forCellWithIndexPath: indexPath)
-		
-		if 0 == indexPath.row {
-			offset = 0
-		}
-		
-		let item: MaterialCollectionViewDataSourceItem = items![indexPath.row]
+		let item: MaterialCollectionViewDataSourceItem = items![indexPath.section][indexPath.item]
 		
 		if .Vertical == scrollDirection {
-			attributes.frame = CGRectMake(0, offset, collectionView!.bounds.width, item.size.height)
+			attributes.frame = CGRectMake(0, offset / scale, collectionView!.bounds.width, item.size.height)
 			offset += item.size.height
 		} else {
-			attributes.frame = CGRectMake(offset, 0, item.size.width, collectionView!.bounds.height)
+			attributes.frame = CGRectMake(offset / scale, 0, item.size.width, collectionView!.bounds.height)
 			offset += item.size.width
 		}
 		
@@ -89,7 +86,7 @@ public class MaterialCollectionViewLayout : UICollectionViewLayout {
 	
 	public override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
 		var layoutAttributes: Array<UICollectionViewLayoutAttributes> = Array<UICollectionViewLayoutAttributes>()
-		for (attribute, _) in layoutItems! {
+		for (attribute, _) in layoutItems {
 			if CGRectIntersectsRect(rect, attribute.frame) {
 				layoutAttributes.append(attribute)
 			}
@@ -109,19 +106,23 @@ public class MaterialCollectionViewLayout : UICollectionViewLayout {
 		let dataSource: MaterialCollectionViewDataSource = collectionView!.dataSource as! MaterialCollectionViewDataSource
 		
 		items = dataSource.items()
-		layoutItems = Array<(UICollectionViewLayoutAttributes, NSIndexPath)>()
+		layoutItems.removeAll()
 		offset = 0
 		
 		var indexPath: NSIndexPath?
-		var count: Int = 0
 		
-		for item in items! {
-			indexPath = NSIndexPath(forItem: count++, inSection: 0)
-			layoutItems?.append((layoutAttributesForItemAtIndexPath(indexPath!)!, indexPath!))
-			offset += .Vertical == scrollDirection ? item.size.height : item.size.width
+		for var i: Int = 0, l: Int = items!.count; i < l; ++i {
+			let v: Array<MaterialCollectionViewDataSourceItem> = items![i]
+			for var j: Int = 0, k: Int = v.count; j < k; ++j {
+				let item: MaterialCollectionViewDataSourceItem = v[j]
+				indexPath = NSIndexPath(forItem: j, inSection: i)
+				layoutItems.append((layoutAttributesForItemAtIndexPath(indexPath!)!, indexPath!))
+				offset += .Vertical == scrollDirection ? item.size.height : item.size.width
+			}
 		}
 		
-		contentSize = .Vertical == scrollDirection ? CGSizeMake(collectionView!.bounds.width, offset) : CGSizeMake(offset, collectionView!.bounds.height)
+		contentSize = .Vertical == scrollDirection ? CGSizeMake(collectionView!.bounds.width, offset / scale) : CGSizeMake(offset / scale, collectionView!.bounds.height)
+		offset = 0
 	}
 	
 	public override func targetContentOffsetForProposedContentOffset(proposedContentOffset: CGPoint) -> CGPoint {