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https://github.com/Instagram/IGListKit
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08bf69cc2f
Summary: ## Changes in this pull request Issue fixed: https://github.com/Instagram/IGListKit/issues/1275 This PR is straintforward solution as mentioned in https://github.com/Instagram/IGListKit/issues/1275. When I finished it, I realized that it is not a problem in `IGListCollectionViewLayout Partial Optimization` and `IGListBindingSectionController` deserved it. Maybe `IGListCollectionViewLayout` is rarely used because of great builtin UICollectionViewFlowLayout or cells in section rarely need changing their sizes in practices. Despite it is not `IGListCollectionViewLayout`'s fault, I think it can be more optimized against `invalidateLayoutWithContext`. I would like to make an another PR to optimize it. Due to this PR just giving a proposed solution, it lacks of adding tests and changing log. When this solution is accepted, I would like to complete these todos. ### Checklist - [x] All tests pass. Demo project builds and runs. - [x] I added tests, an experiment, or detailed why my change isn't tested. - [x] I added an entry to the `CHANGELOG.md` for any breaking changes, enhancements, or bug fixes. - [x] I have reviewed the [contributing guide](https://github.com/Instagram/IGListKit/blob/master/.github/CONTRIBUTING.md) Pull Request resolved: https://github.com/Instagram/IGListKit/pull/1285 Reviewed By: candance Differential Revision: D15592807 Pulled By: lorixx fbshipit-source-id: ae06abce896341509de4f3dfb73b3a7bc0a68c51
57 lines
1.8 KiB
Objective-C
57 lines
1.8 KiB
Objective-C
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import <IGListKit/IGListSectionController.h>
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#import <IGListKit/IGListExperiments.h>
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#import <IGListKit/IGListMacros.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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An instance of `IGListStackedSectionController` is a clustered section controller, composed of many child section
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controllers. It constructs and routes item-level indexes to the appropriate child section controller with a local
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index. This lets you build section controllers made up of individual units that can be shared and reused with other
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section controllers.
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For example, you can create a "Comments" section controller that displays lists of text that is used alongside photo,
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video, or slideshow section controllers. You then have four small and manageable section controllers instead of one
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huge class.
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*/
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IGLK_SUBCLASSING_RESTRICTED
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NS_SWIFT_NAME(ListStackedSectionController)
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@interface IGListStackedSectionController : IGListSectionController
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/**
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A bitmask of experiments to conduct on the section controller.
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*/
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@property (nonatomic, assign) IGListExperiment experiments;
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/**
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Creates a new stacked section controller.
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@param sectionControllers An array of section controllers that make up the stack.
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@note The order of the section controllers dictates the order in which they appear.
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@warning The first section controller that is the supplementary source decides which supplementary views get displayed.
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*/
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- (instancetype)initWithSectionControllers:(NSArray <IGListSectionController *> *)sectionControllers NS_DESIGNATED_INITIALIZER;
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/**
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:nodoc:
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*/
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- (instancetype)init NS_UNAVAILABLE;
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/**
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:nodoc:
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*/
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+ (instancetype)new NS_UNAVAILABLE;
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@end
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NS_ASSUME_NONNULL_END
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