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- //
- // ASSupplementaryNodeSource.h
- // AsyncDisplayKit
- //
- // Created by Adlai Holler on 1/19/17.
- // Copyright © 2017 Facebook. All rights reserved.
- //
- #import <Foundation/Foundation.h>
- NS_ASSUME_NONNULL_BEGIN
- @protocol ASSupplementaryNodeSource <NSObject>
- /**
- * A method to provide the node for the item at the given index.
- *
- * @param elementKind The kind of supplementary element.
- * @param index The index of the item.
- * @return A node for the supplementary element.
- * @see collectionNode:nodeForSupplementaryElementOfKind:atIndexPath:
- */
- - (ASCellNode *)nodeForSupplementaryElementOfKind:(NSString *)elementKind atIndex:(NSInteger)index;
- @optional
- /**
- * A method to provide the size range used for measuring the supplementary
- * element of the given kind at the given index.
- *
- * @param elementKind The kind of supplementary element.
- * @param index The index of the item.
- * @return A size range used for asynchronously measuring the node.
- * @see collectionNode:constrainedSizeForSupplementaryElementOfKind:atIndexPath:
- */
- - (ASSizeRange)sizeRangeForSupplementaryElementOfKind:(NSString *)elementKind atIndex:(NSInteger)index;
- @end
- NS_ASSUME_NONNULL_END
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