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ricky
18d805f523
* [RTL/Batching] Make ASDisplayShouldFetchBatchForScrollView aware of flipped CV layouts UICollectionViewLayout has a property called `flipsHorizontallyInOppositeLayoutDirection`. If this is set to `YES` then a RTL collectionView’s contentOffset behaves like it does in LTR. In other words, the first item is at contentOffset 0. In this case, the existing logic for `ASDisplayShouldFetchBatchForScrollView` works in RTL. If you don’t override `flipsHorizontallyInOppositeLayoutDirection` to be `YES`, then it means that in RTL languages the first item in your collectionView will actually be at x offset `collectionView.contentSize.width - collectionView.frame.size.width`. As you scroll to the right, the content offset will decrease until you reach the end of the data at a content offset of 0,0. In this case, `ASDisplayShouldFetchBatchForScrollView` needs to know that you are in RTL and the layout is not flipped. It can then use the contentOffset as the `remainingDistance` to determine when to fetch. * fix indentation * assert that we are on main when accessing CV layout
81 lines
4.2 KiB
Objective-C
81 lines
4.2 KiB
Objective-C
//
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// ASBatchFetching.h
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: 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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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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@param flipsHorizontallyInOppositeLayoutDirection Whether or not this scroll view flips its layout automatically in RTL.
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See flipsHorizontallyInOppositeLayoutDirection in UICollectionViewLayout
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@return Whether or not the current state should proceed with batch fetching.
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*/
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ASDK_EXTERN 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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BOOL flipsHorizontallyInOppositeLayoutDirection);
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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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@param flipsHorizontallyInOppositeLayoutDirection Whether or not this scroll view flips its layout automatically in RTL.
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See flipsHorizontallyInOppositeLayoutDirection in UICollectionViewLayout
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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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ASDK_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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BOOL shouldRenderRTLLayout,
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CGPoint velocity,
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BOOL flipsHorizontallyInOppositeLayoutDirection,
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_Nullable id<ASBatchFetchingDelegate> delegate);
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NS_ASSUME_NONNULL_END
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