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97 lines
3.0 KiB
Objective-C
97 lines
3.0 KiB
Objective-C
//
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// ASPagerNode.h
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// AsyncDisplayKit
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//
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// Created by Levi McCallum on 12/7/15.
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// Copyright © 2015 Facebook. All rights reserved.
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//
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#import <AsyncDisplayKit/ASCollectionNode.h>
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@class ASPagerNode;
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@class ASPagerFlowLayout;
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#define ASPagerNodeDataSource ASPagerDataSource
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@protocol ASPagerDataSource <NSObject>
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/**
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* This method replaces -collectionView:numberOfItemsInSection:
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*
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* @param pagerNode The sender.
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*
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*
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* @returns The total number of pages that can display in the pagerNode.
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*/
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- (NSInteger)numberOfPagesInPagerNode:(ASPagerNode *)pagerNode;
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@optional
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/**
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* This method replaces -collectionView:nodeForItemAtIndexPath:
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*
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* @param pagerNode The sender.
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*
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* @param index The index of the requested node.
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*
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* @returns a node for display at this index. This will be called on the main thread and should
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* not implement reuse (it will be called once per row). Unlike UICollectionView's version,
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* this method is not called when the row is about to display.
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*/
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- (ASCellNode *)pagerNode:(ASPagerNode *)pagerNode nodeAtIndex:(NSInteger)index;
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/**
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* This method replaces -collectionView:nodeBlockForItemAtIndexPath:
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* This method takes precedence over pagerNode:nodeAtIndex: if implemented.
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*
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* @param pagerNode The sender.
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*
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* @param index The index of the requested node.
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*
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* @returns a block that creates the node for display at this index.
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* Must be thread-safe (can be called on the main thread or a background
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* queue) and should not implement reuse (it will be called once per row).
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*/
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- (ASCellNodeBlock)pagerNode:(ASPagerNode *)pagerNode nodeBlockAtIndex:(NSInteger)index;
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/**
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* Provides the constrained size range for measuring the node at the index path.
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*
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* @param pagerNode The sender.
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*
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* @param indexPath The index path of the node.
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*
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* @returns A constrained size range for layout the node at this index path.
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*/
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- (ASSizeRange)pagerNode:(ASPagerNode *)pagerNode constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath;
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@end
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@protocol ASPagerDelegate <ASCollectionDelegate>
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@end
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@interface ASPagerNode : ASCollectionNode
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/// Configures a default horizontal, paging flow layout with 0 inter-item spacing.
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- (instancetype)init;
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/// Initializer with custom-configured flow layout properties.
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- (instancetype)initWithCollectionViewLayout:(ASPagerFlowLayout *)flowLayout;
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/// Data Source is required, and uses a different protocol from ASCollectionNode.
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- (void)setDataSource:(id <ASPagerDataSource>)dataSource;
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- (id <ASPagerDataSource>)dataSource;
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// Delegate is optional, and uses the same protocol as ASCollectionNode.
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// This includes UIScrollViewDelegate as well as most methods from UICollectionViewDelegate, like willDisplay...
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@property (nonatomic, weak) id <ASPagerDelegate> delegate;
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/// The underlying ASCollectionView object.
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@property (nonatomic, readonly) ASCollectionView *view;
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/// Scroll the contents of the receiver to ensure that the page is visible.
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- (void)scrollToPageAtIndex:(NSInteger)index animated:(BOOL)animated;
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@end
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