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56 lines
2.4 KiB
Objective-C
56 lines
2.4 KiB
Objective-C
/* Copyright (c) 2014-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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#import <UIKit/UIKit.h>
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#import "ASBatchContext.h"
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#import "ASScrollDirection.h"
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ASDISPLAYNODE_EXTERN_C_BEGIN
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@protocol ASBatchFetchingScrollView <NSObject>
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- (BOOL)canBatchFetch;
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- (ASBatchContext *)batchContext;
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- (CGFloat)leadingScreensForBatching;
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@end
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/**
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@abstract Determine if batch fetching should begin based on the state of the parameters.
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@discussion This method is broken into a category for unit testing purposes and should be used with the ASTableView and
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* ASCollectionView batch fetching API.
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@param context The scroll view that in-flight fetches are happening.
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@param scrollDirection The current scrolling direction of the scroll view.
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@param targetOffset The offset that the scrollview will scroll to.
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@return Whether or not the current state should proceed with batch fetching.
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*/
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BOOL ASDisplayShouldFetchBatchForScrollView(UIScrollView<ASBatchFetchingScrollView> *scrollView, ASScrollDirection scrollDirection, CGPoint contentOffset);
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/**
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@abstract Determine if batch fetching should begin based on the state of the parameters.
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@param context The batch fetching context that contains knowledge about in-flight fetches.
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@param scrollDirection The current scrolling direction of the scroll view.
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@param bounds The bounds of the scrollview.
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@param contentSize The content size of the scrollview.
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@param targetOffset The offset that the scrollview will scroll to.
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@param leadingScreens How many screens in the remaining distance will trigger batch fetching.
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@return Whether or not the current state should proceed with batch fetching.
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@discussion This method is broken into a category for unit testing purposes and should be used with the ASTableView and
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* ASCollectionView batch fetching API.
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*/
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extern BOOL ASDisplayShouldFetchBatchForContext(ASBatchContext *context,
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ASScrollDirection scrollDirection,
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CGRect bounds,
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CGSize contentSize,
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CGPoint targetOffset,
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CGFloat leadingScreens);
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ASDISPLAYNODE_EXTERN_C_END
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