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fdc1f0468c
* Improvements in ASCollectionGalleryLayoutDelegate - It now can handle section inset, as well as interitem and line spacings - Other small changes * Fix build failure and update file licenses * Update CHANGELOG * Minor change * Another assertion on scrollable directions of gallery layout delegate
120 lines
4.1 KiB
Objective-C
120 lines
4.1 KiB
Objective-C
//
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// ASCollectionLayoutState.h
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// Texture
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the /ASDK-Licenses directory of this source tree. An additional
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// grant of patent rights can be found in the PATENTS file in the same directory.
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//
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// Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
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// Pinterest, Inc. Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <Foundation/Foundation.h>
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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@class ASCollectionLayoutContext, ASLayout, ASCollectionElement;
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NS_ASSUME_NONNULL_BEGIN
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typedef ASCollectionElement * _Nullable (^ASCollectionLayoutStateGetElementBlock)(ASLayout *);
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@interface NSMapTable (ASCollectionLayoutConvenience)
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+ (NSMapTable<ASCollectionElement *, UICollectionViewLayoutAttributes *> *)elementToLayoutAttributesTable;
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@end
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AS_SUBCLASSING_RESTRICTED
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/// An immutable state of the collection layout
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@interface ASCollectionLayoutState : NSObject
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/// The context used to calculate this object
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@property (nonatomic, strong, readonly) ASCollectionLayoutContext *context;
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/// The final content size of the collection's layout
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@property (nonatomic, assign, readonly) CGSize contentSize;
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- (instancetype)init __unavailable;
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/**
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* Designated initializer.
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*
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* @param context The context used to calculate this object
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*
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* @param contentSize The content size of the collection's layout
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*
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* @param table A map between elements to their layout attributes. It must contain all elements.
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* It should have NSMapTableObjectPointerPersonality and NSMapTableWeakMemory as key options.
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*/
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- (instancetype)initWithContext:(ASCollectionLayoutContext *)context
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contentSize:(CGSize)contentSize
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elementToLayoutAttributesTable:(NSMapTable<ASCollectionElement *, UICollectionViewLayoutAttributes *> *)table NS_DESIGNATED_INITIALIZER;
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/**
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* Convenience initializer. Returns an object with zero content size and an empty table.
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*
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* @param context The context used to calculate this object
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*/
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- (instancetype)initWithContext:(ASCollectionLayoutContext *)context;
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/**
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* Convenience initializer.
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*
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* @param context The context used to calculate this object
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*
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* @param layout The layout describes size and position of all elements.
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*
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* @param getElementBlock A block that can retrieve the collection element from a sublayout of the root layout.
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*/
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- (instancetype)initWithContext:(ASCollectionLayoutContext *)context
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layout:(ASLayout *)layout
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getElementBlock:(ASCollectionLayoutStateGetElementBlock)getElementBlock;
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/**
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* Returns all layout attributes present in this object.
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*/
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- (NSArray<UICollectionViewLayoutAttributes *> *)allLayoutAttributes;
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/**
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* Returns layout attributes of elements in the specified rect.
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*
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* @param rect The rect containing the target elements.
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*/
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- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect;
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/**
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* Returns layout attributes of the element at the specified index path.
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*
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* @param indexPath The index path of the item.
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*/
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- (nullable UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath;
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/**
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* Returns layout attributes of the specified supplementary element.
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*
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* @param kind A string that identifies the type of the supplementary element.
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*
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* @param indexPath The index path of the element.
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*/
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- (nullable UICollectionViewLayoutAttributes *)layoutAttributesForSupplementaryElementOfKind:(NSString *)kind
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atIndexPath:(NSIndexPath *)indexPath;
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/**
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* Returns layout attributes of the specified element.
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*
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* @element The element.
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*/
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- (nullable UICollectionViewLayoutAttributes *)layoutAttributesForElement:(ASCollectionElement *)element;
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@end
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NS_ASSUME_NONNULL_END
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