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

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

submodules/AsyncDisplayKit/examples/LayoutSpecExamples/Sample/LayoutExampleViewController.m

@@ -0,0 +1,47 @@
+//
+//  LayoutExampleViewController.m
+//  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 "LayoutExampleViewController.h"
+#import "LayoutExampleNodes.h"
+
+@interface LayoutExampleViewController ()
+@property (nonatomic, strong) LayoutExampleNode *customNode;
+@end
+
+@implementation LayoutExampleViewController
+
+- (instancetype)initWithLayoutExampleClass:(Class)layoutExampleClass
+{
+  NSAssert([layoutExampleClass isSubclassOfClass:[LayoutExampleNode class]], @"Must pass a subclass of LayoutExampleNode.");
+  
+  self = [super initWithNode:[ASDisplayNode new]];
+  
+  if (self) {
+    self.title = @"Layout Example";
+    
+    _customNode = [layoutExampleClass new];
+    [self.node addSubnode:_customNode];
+    
+    BOOL needsOnlyYCentering = [layoutExampleClass isEqual:[HeaderWithRightAndLeftItems class]] ||
+                               [layoutExampleClass isEqual:[FlexibleSeparatorSurroundingContent class]];
+                               
+    self.node.backgroundColor = needsOnlyYCentering ? [UIColor lightGrayColor] : [UIColor whiteColor];
+    
+    __weak __typeof(self) weakself = self;
+    self.node.layoutSpecBlock = ^ASLayoutSpec*(__kindof ASDisplayNode * _Nonnull node, ASSizeRange constrainedSize) {
+      return [ASCenterLayoutSpec centerLayoutSpecWithCenteringOptions:needsOnlyYCentering ? ASCenterLayoutSpecCenteringY : ASCenterLayoutSpecCenteringXY
+                                                        sizingOptions:ASCenterLayoutSpecSizingOptionMinimumXY
+                                                                child:weakself.customNode];
+      };
+  }
+  
+  return self;
+}
+
+@end