Add 'submodules/AsyncDisplayKit/' from commit '02bedc12816e251ad71777f9d2578329b6d2bef6'

git-subtree-dir: submodules/AsyncDisplayKit
git-subtree-mainline: d06f423e0e
git-subtree-split: 02bedc1281

submodules/AsyncDisplayKit/examples/CustomCollectionView-Swift/Sample/ImageCellNode.swift

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+//
+//  ImageCellNode.swift
+//  Texture
+//
+//  Copyright (c) Facebook, Inc. and its affiliates.  All rights reserved.
+//  Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+import UIKit
+import AsyncDisplayKit
+
+class ImageCellNode: ASCellNode {
+  let imageNode = ASImageNode()
+  required init(with image : UIImage) {
+    super.init()
+    imageNode.image = image
+    self.addSubnode(self.imageNode)
+  }
+
+  override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
+    var imageRatio: CGFloat = 0.5
+    if imageNode.image != nil {
+      imageRatio = (imageNode.image?.size.height)! / (imageNode.image?.size.width)!
+    }
+    
+    let imagePlace = ASRatioLayoutSpec(ratio: imageRatio, child: imageNode)
+    
+    let stackLayout = ASStackLayoutSpec.horizontal()
+    stackLayout.justifyContent = .start
+    stackLayout.alignItems = .start
+    stackLayout.style.flexShrink = 1.0
+    stackLayout.children = [imagePlace]
+    
+    return  ASInsetLayoutSpec(insets: UIEdgeInsets.zero, child: stackLayout)
+  }
+  
+}