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87 lines
3.0 KiB
Objective-C
87 lines
3.0 KiB
Objective-C
//
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// ASCollectionViewFlowLayoutInspector.h
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// AsyncDisplayKit
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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 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 ASCollectionDataSource;
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@protocol ASCollectionDelegate;
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NS_ASSUME_NONNULL_BEGIN
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@protocol ASCollectionViewLayoutInspecting <NSObject>
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/**
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* Asks the inspector to provide a constarained size range for the given collection view node.
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*/
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- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath;
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@optional
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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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/**
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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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/**
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* Allow the inspector to respond to dataSource 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)didChangeCollectionViewDataSource:(id<ASCollectionDataSource>)dataSource;
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@end
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/**
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* A layout inspector for non-flow layouts that returns a constrained size to let the cells layout itself as
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* far as possible based on the scrollable direction of the collection view. It throws exceptions for delegate
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* methods that are related to supplementary node's management.
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*/
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@interface ASCollectionViewLayoutInspector : NSObject <ASCollectionViewLayoutInspecting>
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- (instancetype)init NS_UNAVAILABLE;
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- (instancetype)initWithCollectionView:(ASCollectionView *)collectionView NS_DESIGNATED_INITIALIZER;
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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, readonly) UICollectionViewFlowLayout *layout;
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- (instancetype)init NS_UNAVAILABLE;
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- (instancetype)initWithCollectionView:(ASCollectionView *)collectionView flowLayout:(UICollectionViewFlowLayout *)flowLayout NS_DESIGNATED_INITIALIZER;
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@end
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NS_ASSUME_NONNULL_END
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