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git-subtree-dir: submodules/AsyncDisplayKit git-subtree-mainline: d06f423e0ed3df1fed9bd10d79ee312a9179b632 git-subtree-split: 02bedc12816e251ad71777f9d2578329b6d2bef6
89 lines
2.9 KiB
Objective-C
89 lines
2.9 KiB
Objective-C
//
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// ASSectionController.h
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#ifndef MINIMAL_ASDK
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#import <Foundation/Foundation.h>
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#import <AsyncDisplayKit/ASBlockTypes.h>
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#import <AsyncDisplayKit/ASDimension.h>
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NS_ASSUME_NONNULL_BEGIN
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@class ASBatchContext;
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/**
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* A protocol that your section controllers should conform to, in order to be used with Texture.
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*
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* @note Your supplementary view source should conform to @c ASSupplementaryNodeSource.
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*/
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@protocol ASSectionController <NSObject>
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@optional
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/**
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* A method to provide the node block for the item at the given index.
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* The node block you return will be run asynchronously off the main thread,
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* so it's important to retrieve any objects from your section _outside_ the block
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* because by the time the block is run, the array may have changed.
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*
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* @param index The index of the item.
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* @return A block to be run concurrently to build the node for this item.
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* @see collectionNode:nodeBlockForItemAtIndexPath:
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*/
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- (ASCellNodeBlock)nodeBlockForItemAtIndex:(NSInteger)index;
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/**
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* Similar to -collectionView:cellForItemAtIndexPath:.
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*
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* Note: only called if nodeBlockForItemAtIndex: returns nil.
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*
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* @param index The index of the item.
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*
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* @return A node to display for the given item. This will be called on the main thread and should
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* not implement reuse (it will be called once per item). Unlike UICollectionView's version,
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* this method is not called when the item is about to display.
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*/
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- (ASCellNode *)nodeForItemAtIndex:(NSInteger)index;
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/**
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* Asks the section controller whether it should batch fetch because the user is
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* near the end of the current data set.
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*
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* @discussion Use this method to conditionally fetch batches. Example use cases are: limiting the total number of
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* objects that can be fetched or no network connection.
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*
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* If not implemented, the assumed return value is @c YES.
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*/
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- (BOOL)shouldBatchFetch;
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/**
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* Asks the section controller to begin fetching more content (tail loading) because
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* the user is near the end of the current data set.
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*
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* @param context A context object that must be notified when the batch fetch is completed.
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*
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* @discussion You must eventually call -completeBatchFetching: with an argument of YES in order to receive future
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* notifications to do batch fetches. This method is called on a background queue.
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*/
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- (void)beginBatchFetchWithContext:(ASBatchContext *)context;
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/**
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* A method to provide the size range used for measuring the item
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* at the given index.
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*
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* @param index The index of the item.
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* @return A size range used for asynchronously measuring the node at this index.
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* @see collectionNode:constrainedSizeForItemAtIndexPath:
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*/
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- (ASSizeRange)sizeRangeForItemAtIndex:(NSInteger)index;
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@end
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NS_ASSUME_NONNULL_END
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#endif
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