mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-14 21:08:48 +00:00
79348164a7
Summary: Started work on the plane to get this moving since #418 is up and ready to land. We'll likely need to spend some time fleshing out the API of this, and I think I'll split it up into a couple different PRs once ready for review. Putting this up now to get early feedback. This adds an auto-diffing section controller as outlined in #38. There are several key parts: - Subclass a new section controller `IGListAutoSectionController` (naming wip) - Connect a data source - Implement the data source methods that do 3 things: - Given a top-level object, transform it into an array of **diffable** view models - Given a view model, return a cell - Given a view model, return a size for a cell - A new protocol for the cell `IGListBindable` so that we can control when the cell is updated w/ the view model. - The most important part of this is that it unlocks moving and reloading a cell, which you can't do w/ `UICollectionView` - [ ] Unit test `reloadObjects:` - [x] Add Closes https://github.com/Instagram/IGListKit/pull/494 Reviewed By: amonshiz Differential Revision: D4696966 Pulled By: rnystrom fbshipit-source-id: f21b8341b3ed4389f2a4a106d0d316f481ba6943
63 lines
2.2 KiB
Objective-C
63 lines
2.2 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 <Foundation/Foundation.h>
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@class IGListBindingSectionController;
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@protocol IGListBindable;
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@protocol IGListDiffable;
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NS_ASSUME_NONNULL_BEGIN
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/**
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A protocol that returns data to power cells in an `IGListBindingSectionController`.
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*/
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@protocol IGListBindingSectionControllerDataSource <NSObject>
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/**
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Create an array of view models given a top-level object.
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@param sectionController The section controller requesting view models.
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@param object The top-level object that powers the section controller.
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@return A new array of view models.
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*/
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- (NSArray<id<IGListDiffable>> *)sectionController:(IGListBindingSectionController *)sectionController
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viewModelsForObject:(id)object;
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/**
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Return a dequeued cell for a given view model.
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@param sectionController The section controller requesting a cell.
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@param viewModel The view model for the cell.
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@param index The index of the view model.
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@return A dequeued cell.
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@note The section controller will call `-bindViewModel:` with the provided view model after the cell is dequeued. You
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should handle cell configuration using this method. However, you can do additional configuration at this stage as well.
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*/
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- (UICollectionViewCell<IGListBindable> *)sectionController:(IGListBindingSectionController *)sectionController
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cellForViewModel:(id)viewModel
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atIndex:(NSInteger)index;
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/**
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Return a cell size for a given view model.
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@param sectionController The section controller requesting a size.
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@param viewModel The view model for the cell.
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@param index The index of the view model.
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@return A size for the view model.
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*/
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- (CGSize)sectionController:(IGListBindingSectionController *)sectionController
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sizeForViewModel:(id)viewModel
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atIndex:(NSInteger)index;
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@end
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NS_ASSUME_NONNULL_END
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