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git-subtree-dir: submodules/AsyncDisplayKit git-subtree-mainline: d06f423e0ed3df1fed9bd10d79ee312a9179b632 git-subtree-split: 02bedc12816e251ad71777f9d2578329b6d2bef6
111 lines
3.6 KiB
Objective-C
111 lines
3.6 KiB
Objective-C
//
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// ASCollectionGalleryLayoutDelegate.h
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// Texture
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//
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// 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 <AsyncDisplayKit/ASCollectionLayoutDelegate.h>
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#import <AsyncDisplayKit/ASScrollDirection.h>
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@class ASElementMap;
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@class ASCollectionGalleryLayoutDelegate;
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NS_ASSUME_NONNULL_BEGIN
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@protocol ASCollectionGalleryLayoutPropertiesProviding <NSObject>
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/**
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* Returns the fixed size of each and every element.
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*
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* @discussion This method will only be called on main thread.
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*
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* @param delegate The calling object.
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*
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* @param elements All elements to be sized.
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*
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* @return The elements' size
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*/
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- (CGSize)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate sizeForElements:(ASElementMap *)elements;
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@optional
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/**
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* Returns the minumum spacing to use between lines of items.
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*
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* @discussion This method will only be called on main thread.
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*
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* @discussion For a vertically scrolling layout, this value represents the minimum spacing between rows.
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* For a horizontally scrolling one, it represents the minimum spacing between columns.
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* It is not applied between the first line and the header, or between the last line and the footer.
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* This is the same behavior as UICollectionViewFlowLayout's minimumLineSpacing.
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*
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* @param delegate The calling object.
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*
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* @param elements All elements in the layout.
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*
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* @return The interitem spacing
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*/
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- (CGFloat)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate minimumLineSpacingForElements:(ASElementMap *)elements;
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/**
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* Returns the minumum spacing to use between items in the same row or column, depending on the scroll directions.
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*
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* @discussion This method will only be called on main thread.
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*
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* @discussion For a vertically scrolling layout, this value represents the minimum spacing between items in the same row.
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* For a horizontally scrolling one, it represents the minimum spacing between items in the same column.
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* It is considered while fitting items into lines, but the actual final spacing between some items might be larger.
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* This is the same behavior as UICollectionViewFlowLayout's minimumInteritemSpacing.
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*
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* @param delegate The calling object.
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*
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* @param elements All elements in the layout.
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*
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* @return The interitem spacing
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*/
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- (CGFloat)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate minimumInteritemSpacingForElements:(ASElementMap *)elements;
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/**
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* Returns the margins of each section.
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*
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* @discussion This method will only be called on main thread.
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*
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* @param delegate The calling object.
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*
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* @param elements All elements in the layout.
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*
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* @return The margins used to layout content in a section
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*/
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- (UIEdgeInsets)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate sectionInsetForElements:(ASElementMap *)elements;
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@end
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/**
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* A thread-safe layout delegate that arranges items with the same size into a flow layout.
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*
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* @note Supplemenraty elements are not supported.
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*/
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AS_SUBCLASSING_RESTRICTED
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@interface ASCollectionGalleryLayoutDelegate : NSObject <ASCollectionLayoutDelegate>
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@property (nonatomic, weak) id<ASCollectionGalleryLayoutPropertiesProviding> propertiesProvider;
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/**
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* Designated initializer.
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*
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* @param scrollableDirections The scrollable directions of this layout. Must be either vertical or horizontal directions.
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*/
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- (instancetype)initWithScrollableDirections:(ASScrollDirection)scrollableDirections NS_DESIGNATED_INITIALIZER;
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- (instancetype)init __unavailable;
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@end
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NS_ASSUME_NONNULL_END
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#endif
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