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8c45eaefce
* Add ASBatchFetchingDelegate - In addition to checking remaining leading screens, ASBatchFetching now also calculates a remaining time and consults its delegate if needed. - The delegate can override the decision of ASBatchFetching, for example based on remaining time and average time of past batch requests. * Fix up tests * Update CHANGELOG
85 lines
4.0 KiB
Objective-C
85 lines
4.0 KiB
Objective-C
//
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// ASBatchFetching.h
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// Texture
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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 /ASDK-Licenses directory of this source tree. An additional
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// grant of patent rights can be found in the PATENTS file in the same directory.
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//
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// Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
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// Pinterest, Inc. Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASScrollDirection.h>
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ASDISPLAYNODE_EXTERN_C_BEGIN
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NS_ASSUME_NONNULL_BEGIN
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@class ASBatchContext;
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@protocol ASBatchFetchingDelegate;
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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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- (nullable id<ASBatchFetchingDelegate>)batchFetchingDelegate;
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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 scrollView 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 scrollableDirections The possible scrolling directions of the scroll view.
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@param contentOffset The offset that the scrollview will scroll to.
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@param velocity The velocity of the scroll view (in points) at the moment the touch was released.
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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,
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ASScrollDirection scrollDirection,
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ASScrollDirection scrollableDirections,
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CGPoint contentOffset,
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CGPoint velocity);
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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 scrollableDirections The possible scrolling directions 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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@param visible Whether the view is visible or not.
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@param velocity The velocity of the scroll view (in points) at the moment the touch was released.
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@param delegate The delegate to be consulted if needed.
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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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ASScrollDirection scrollableDirections,
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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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BOOL visible,
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CGPoint velocity,
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_Nullable id<ASBatchFetchingDelegate> delegate);
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NS_ASSUME_NONNULL_END
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ASDISPLAYNODE_EXTERN_C_END
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