mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-14 21:08:48 +00:00
82a2a2ee18
Summary: * Issue: [IGListAdapter visibleSectionControllers] calls [UICollectionViewLayout layoutAttributesForElementsInRect:] which can be expensive. And since visibleSectionControllers is called in scrollViewDidScroll, it can add up and take a toll on scroll performance. On an iPhone 7, it's in 2-10% of the main-thread samples (using Time Profiler). * Fix: IGListDisplayHandler conveniently keeps track of visible IGListSectionControllers, so let's just use that. Now, [IGListAdapter visibleSectionControllers] drops to ~0.3% of samples. Reviewed By: rnystrom Differential Revision: D6351474 fbshipit-source-id: 66914db95e08498927bfbceda4d2e9d58cbc7530
89 lines
3.3 KiB
Objective-C
89 lines
3.3 KiB
Objective-C
/**
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* Copyright (c) 2016-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 <IGListKit/IGListMacros.h>
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@class IGListAdapter;
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@class IGListSectionController;
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NS_ASSUME_NONNULL_BEGIN
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IGLK_SUBCLASSING_RESTRICTED
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@interface IGListDisplayHandler : NSObject
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/**
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Counted set of the currently visible section controllers.
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*/
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@property (nonatomic, strong, readonly) NSCountedSet<IGListSectionController *> *visibleListSections;
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/**
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Tells the handler that a cell will be displayed in the IGListAdapter.
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@param cell A cell that will be displayed.
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@param listAdapter The adapter the cell will display in.
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@param sectionController The section controller that manages the cell.
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@param object The object that powers the section controller.
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@param indexPath The index path of the cell in the UICollectionView.
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*/
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- (void)willDisplayCell:(UICollectionViewCell *)cell
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forListAdapter:(IGListAdapter *)listAdapter
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sectionController:(IGListSectionController *)sectionController
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object:(id)object
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indexPath:(NSIndexPath *)indexPath;
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/**
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Tells the handler that a cell did end display in the IGListAdapter.
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@param cell A cell that will be displayed.
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@param listAdapter The adapter the cell will display in.
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@param sectionController The section controller that manages the cell.
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@param indexPath The index path of the cell in the UICollectionView.
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*/
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- (void)didEndDisplayingCell:(UICollectionViewCell *)cell
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forListAdapter:(IGListAdapter *)listAdapter
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sectionController:(IGListSectionController *)sectionController
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indexPath:(NSIndexPath *)indexPath;
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/**
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Tells the handler that a supplementary view will be displayed in the IGListAdapter.
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@param view A supplementary view that will be displayed.
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@param listAdapter The adapter the supplementary view will display in.
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@param sectionController The section controller that manages the supplementary view.
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@param object The object that powers the section controller.
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@param indexPath The index path of the supplementary view in the UICollectionView.
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*/
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- (void)willDisplaySupplementaryView:(UICollectionReusableView *)view
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forListAdapter:(IGListAdapter *)listAdapter
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sectionController:(IGListSectionController *)sectionController
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object:(id)object
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indexPath:(NSIndexPath *)indexPath;
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/**
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Tells the handler that a supplementary view did end display in the IGListAdapter.
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@param view A supplementary view that will be displayed.
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@param listAdapter The adapter the supplementary view will display in.
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@param sectionController The section controller that manages the supplementary view.
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@param indexPath The index path of the supplementary view in the UICollectionView.
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*/
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- (void)didEndDisplayingSupplementaryView:(UICollectionReusableView *)view
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forListAdapter:(IGListAdapter *)listAdapter
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sectionController:(IGListSectionController *)sectionController
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indexPath:(NSIndexPath *)indexPath;
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@end
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NS_ASSUME_NONNULL_END
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