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

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

submodules/AsyncDisplayKit/examples/ASDKgram/Sample/TailLoadingNode.m

@@ -0,0 +1,54 @@
+//
+//  TailLoadingNode.m
+//  Texture
+//
+//  Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#import "TailLoadingNode.h"
+
+#import "Availability.h"
+
+@interface TailLoadingNode ()
+@property (nonatomic, strong) ASDisplayNode *activityIndicatorNode;
+@end
+
+@implementation TailLoadingNode
+
+- (instancetype)init
+{
+  if (self = [super init]) {
+    self.automaticallyManagesSubnodes = YES;
+
+    _activityIndicatorNode = [[ASDisplayNode alloc] initWithViewBlock:^{
+      UIActivityIndicatorView *v = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
+      [v startAnimating];
+      return v;
+    }];
+    self.style.height = ASDimensionMake(100);
+
+    [self setupYogaLayoutIfNeeded];
+  }
+  return self;
+}
+#if !YOGA_LAYOUT
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+  return [ASCenterLayoutSpec centerLayoutSpecWithCenteringOptions:ASCenterLayoutSpecCenteringXY sizingOptions:ASCenterLayoutSpecSizingOptionMinimumXY child:self.activityIndicatorNode];
+}
+#endif
+
+- (void)setupYogaLayoutIfNeeded
+{
+#if YOGA_LAYOUT
+  [self.style yogaNodeCreateIfNeeded];
+  [self.activityIndicatorNode.style yogaNodeCreateIfNeeded];
+  [self addYogaChild:self.activityIndicatorNode];
+
+  self.style.justifyContent = ASStackLayoutJustifyContentCenter;
+  self.style.alignItems = ASStackLayoutAlignItemsCenter;
+#endif
+}
+
+@end