mirror of
https://github.com/Instagram/IGListKit
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34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import <Foundation/Foundation.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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A protocol for layouts that defines interaction with an IGListCollectionView, for recieving updated section indexes.
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*/
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NS_SWIFT_NAME(ListCollectionViewLayoutCompatible)
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@protocol IGListCollectionViewLayoutCompatible <NSObject>
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/**
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Called to notify the layout that a specific section was modified before invalidation. This can be used to optimize
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layout re-calculation.
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@note When updating a collection view (ex: calling `-insertSections`), `-invalidateLayoutWithContext` gets called on
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the layout object. However, the invalidation context doesn't provide details on which index paths are being modified,
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which typically forces a full layout re-calculation. Layouts can use this method to keep track of which section
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actually needs to be updated on the following `-invalidateLayoutWithContext`. See `IGListCollectionView`.
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@param modifiedSection The section that was modified.
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*/
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- (void)didModifySection:(NSInteger)modifiedSection;
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@end
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NS_ASSUME_NONNULL_END
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