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00d9372ee4
The purpose of the ASCollectionViewCustomLayoutInspector is to provide a default implementation if given a custom layout, but no layout inspector.
68 lines
2.4 KiB
Objective-C
68 lines
2.4 KiB
Objective-C
/* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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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 root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#pragma once
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#import <Foundation/Foundation.h>
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#import <AsyncDisplayKit/ASDimension.h>
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@class ASCollectionView;
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@protocol ASCollectionDelegate;
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@protocol ASCollectionViewLayoutInspecting <NSObject>
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/**
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* Provides the size range needed to measure the collection view's item.
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*/
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- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath;
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/**
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* Asks the inspector to provide a constrained size range for the given supplementary node.
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*/
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- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForSupplementaryNodeOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath;
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/**
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* Asks the inspector for the number of supplementary sections in the collection view for the given kind.
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*/
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- (NSUInteger)collectionView:(ASCollectionView *)collectionView numberOfSectionsForSupplementaryNodeOfKind:(NSString *)kind;
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/**
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* Asks the inspector for the number of supplementary views for the given kind in the specified section.
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*/
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- (NSUInteger)collectionView:(ASCollectionView *)collectionView supplementaryNodesOfKind:(NSString *)kind inSection:(NSUInteger)section;
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@optional
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/**
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* Allow the inspector to respond to delegate changes.
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*
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* @discussion A great time to update perform selector caches!
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*/
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- (void)didChangeCollectionViewDelegate:(id<ASCollectionDelegate>)delegate;
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@end
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/**
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* Simple "Null Object" inspector for non-flow layouts that does not implement a custom inspector, provides a zero
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* constrained size and throws an exception if methods are called from <ASCollectionViewLayoutInspecting>
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*/
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@interface ASCollectionViewCustomLayoutInspector : NSObject <ASCollectionViewLayoutInspecting>
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@end
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/**
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* A layout inspector implementation specific for the sizing behavior of UICollectionViewFlowLayouts
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*/
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@interface ASCollectionViewFlowLayoutInspector : NSObject <ASCollectionViewLayoutInspecting>
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@property (nonatomic, weak) UICollectionViewFlowLayout *layout;
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- (instancetype)initWithCollectionView:(ASCollectionView *)collectionView flowLayout:(UICollectionViewFlowLayout *)flowLayout;
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@end
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