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# Conflicts: # AsyncDisplayKit.xcodeproj/project.pbxproj # AsyncDisplayKit.xcodeproj/xcshareddata/xcschemes/AsyncDisplayKit.xcscheme # Source/ASDisplayNode.mm # Source/ASEditableTextNode.h # Source/ASImageNode.mm # Source/ASMapNode.h # Source/ASMapNode.mm # Source/Base/ASAssert.m # Source/Details/ASPhotosFrameworkImageRequest.h # Source/Details/ASPhotosFrameworkImageRequest.m # Source/Layout/ASLayoutElement.mm
64 lines
2.4 KiB
Objective-C
64 lines
2.4 KiB
Objective-C
//
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// ASCollectionLayoutDelegate.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 <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASScrollDirection.h>
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@class ASElementMap, ASCollectionLayoutContext, ASCollectionLayoutState;
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NS_ASSUME_NONNULL_BEGIN
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@protocol ASCollectionLayoutDelegate <NSObject>
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/**
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* @abstract Returns the scrollable directions of the coming layout (@see @c -calculateLayoutWithContext:).
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* It will be available in the context parameter in +calculateLayoutWithContext:
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*
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* @return The scrollable directions.
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*
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* @discusstion This method will be called on main thread.
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*/
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- (ASScrollDirection)scrollableDirections;
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/**
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* @abstract Returns any additional information needed for a coming layout pass (@see @c -calculateLayoutWithContext:) with the given elements.
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*
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* @param elements The elements to be laid out later.
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*
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* @discussion The returned object must support equality and hashing (i.e `-isEqual:` and `-hash` must be properly implemented).
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* It should contain all the information needed for the layout pass to perform. It will be available in the context parameter in +calculateLayoutWithContext:
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*
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* This method will be called on main thread.
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*/
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- (nullable id)additionalInfoForLayoutWithElements:(ASElementMap *)elements;
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/**
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* @abstract Prepares and returns a new layout for given context.
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*
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* @param context A context that contains all elements to be laid out and any additional information needed.
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*
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* @return The new layout calculated for the given context.
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*
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* @discussion This method is called ahead of time, i.e before the underlying collection/table view is aware of the provided elements.
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* As a result, clients must solely rely on the given context and should not reach out to other objects for information not available in the context.
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*
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* This method can be called on background theads. It must be thread-safe and should not change any internal state of this delegate.
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* It must block the calling thread but can dispatch to other theads to reduce total blocking time.
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*/
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+ (ASCollectionLayoutState *)calculateLayoutWithContext:(ASCollectionLayoutContext *)context;
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@end
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NS_ASSUME_NONNULL_END
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#endif
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