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

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

submodules/AsyncDisplayKit/Source/Private/ASCollectionLayout.h

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+//
+//  ASCollectionLayout.h
+//  Texture
+//
+//  Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#ifndef MINIMAL_ASDK
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+#import <AsyncDisplayKit/ASBaseDefines.h>
+
+@protocol ASCollectionLayoutDelegate;
+@class ASElementMap, ASCollectionLayout, ASCollectionNode;
+
+NS_ASSUME_NONNULL_BEGIN
+
+AS_SUBCLASSING_RESTRICTED
+@interface ASCollectionLayout : UICollectionViewLayout
+
+/**
+ * The collection node object currently using this layout object.
+ *
+ * @discussion The collection node object sets the value of this property when a new layout object is assigned to it.
+ *
+ * @discussion To get the truth on the current state of the collection, call methods on the collection node or the data source rather than the collection view because:
+ *  1. The view might not yet be allocated.
+ *  2. The collection node and data source are thread-safe.
+ */
+@property (nonatomic, weak) ASCollectionNode *collectionNode;
+
+@property (nonatomic, readonly) id<ASCollectionLayoutDelegate> layoutDelegate;
+
+/**
+ * Initializes with a layout delegate.
+ *
+ * @discussion For developers' convenience, the delegate is retained by this layout object, similar to UICollectionView retains its UICollectionViewLayout object.
+ *
+ * @discussion For simplicity, the delegate is read-only. If a new layout delegate is needed, construct a new layout object with that delegate and notify ASCollectionView about it.
+ * This ensures the underlying UICollectionView purges its cache and properly loads the new layout.
+ */
+- (instancetype)initWithLayoutDelegate:(id<ASCollectionLayoutDelegate>)layoutDelegate NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init __unavailable;
+
+- (instancetype)initWithCoder:(NSCoder *)aDecoder __unavailable;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif