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1d28639301
* Add scrollableDirections method to ASCollectionViewLayoutInspecting protocol ASViewController's default method will not always return the correct scrollable directions in cases where size changes may not have been applied. This allows us to ignore this issue for a little while longer by allowing the layout inspector to explicitly vend this. * Better header, thanks @maicki!
98 lines
3.5 KiB
Objective-C
98 lines
3.5 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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#import <AsyncDisplayKit/ASScrollDirection.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 constrained 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 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:(nullable 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:(nullable id<ASCollectionDataSource>)dataSource;
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/**
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* Return the directions in which your collection view can scroll
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*/
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- (ASScrollDirection)scrollableDirections;
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#pragma mark Deprecated Methods
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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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* @deprecated This method will not be called, and it is only deprecated as a reminder to remove it.
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* Supplementary elements must exist in the same sections as regular collection view items i.e. -numberOfSectionsInCollectionView:
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*/
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- (NSUInteger)collectionView:(ASCollectionView *)collectionView numberOfSectionsForSupplementaryNodeOfKind:(NSString *)kind ASDISPLAYNODE_DEPRECATED;
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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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