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* Introduce ASCollectionViewLayout - `ASCollectionViewLayout` is an async `UICollectionViewLayout` that encapsulates its layout calculation logic into a separate thread-safe object which can be used ahead of time and/or on multiple threads. - `ASDataController` now can prepare for a new layout resulted from a change set before `ASCollectionView` even knows about it. By the time the change set it ready to be consumed by `ASCollectionView`, its new layout is also ready. - New `ASCollectionViewLayoutCalculating` protocol that is simple and generic enough that many types of calculators can be built on top. `ASCollectionViewLayoutSpecCalculator` conforms to `ASCollectionViewLayoutCalculating` protocol and can be backed by any layout spec (e.g `ASStackLayoutSpec`, `PIMasonryLayoutSpec`, etc). We can even build a `ASCollectionViewLayoutYogaCalculator` that uses Yoga internally. - A built-in `ASCollectionViewFlowLayoutCalculator` that is a subclass of `ASCollectionViewLayoutSpecCalculator` and uses a multi-threaded multi-line `ASStackLayoutSpec` internally. The result is a performant and thread-safe flow layout calculator. - Finally, `ASCollectionViewLayout` can be subclassed to handle a specific type of calculator with optimizations implemented based on the knowledge of such calculator. For example, `ASCollectionViewFlowLayout` can have a highly optimized implementation of `-layoutAttributesForElementsInRect:`. Protocolize layout calculator providing and consuming Add flex wrap documentation Add a `multithreaded` flag to ASStackLayoutSpec that forces it to dispatch even if it's off main - Update ASCollectionViewFlowLayoutSpecCalculator to use that flag. Minor change in ASCollectionViewLayout Implement Mosaic layout calculator Minor change Fix project file Rename and fix project file Skip fetching constrained size only if a layout calculator is available Update examples/ASCollectionView Remove unnecessary change in ASTableView Address comments Rename collection view calculator protocols Minor changes after rebasing with master Add ASLegacyCollectionLayoutCalculator for backward compatibility Remove ASCollectionLayoutSpecCalculator Remove ASLegacyCollectionLayoutCalculator Introduce ASCollectionLayout - A wrapper object that contains content size and an element to rect table. - Collection layout calculators to return this new object instead of an ASLayout. Before adding a content cache Finishing hooking up ASCollectionLayoutDataSource to ASCollectionNode Stash Finish ASCollectionLayout Rough impl of ASCollectionFlowLayout Revert changes in CustomCollectionView example Move ASRectTable back to Private * Rename ASCollectionContentAttributes to ASCollectionLayoutState * Address other comments * Introduce ASCollectionLayoutDelegate and make ASCollectionLayout private * Address comments * API tweaks: - Replace `-layoutContextWithElementMap:` in ASCollectionLayoutDelegate with `-additionalInfoForLayoutWithElements:`. The returned object is then stored in ASCollectionLayoutContext for later lookups. - ASCollectionLayoutContext has no public initializer. - ASDataControllerLayoutDelegate no longer requires a context of type ASCollectionLayoutContext but simply an `id`. This helps decouple ASDataController and ASCollectionLayout. - Rename `elementMap` to `elements`. - Rename `visibleMap` to `visibleElements`. - Other minor changes. * Rename ASCGSizeHash to ASHashFromCGSize * Make sure to call super in -[ASCollectionLayout prepareLayout] * Update example/ASCollectionView to use ASCollectionFlowLayoutDelegate * Remove unnecessary change
46 lines
1.6 KiB
Objective-C
46 lines
1.6 KiB
Objective-C
//
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// ASCollectionLayoutDelegate.h
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// AsyncDisplayKit
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//
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// Created by Huy Nguyen on 21/3/17.
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// Copyright © 2017 Facebook. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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#import <UIKit/UIKit.h>
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@class ASElementMap, ASCollectionLayoutContext, ASCollectionLayoutState;
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NS_ASSUME_NONNULL_BEGIN
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@protocol ASCollectionLayoutDelegate <NSObject>
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/**
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* @abstract Returns any additional information needed for a coming layout pass with the given elements.
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*
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* @discussion The returned object must support equality and hashing (i.e `-isEqual:` and `-hash` must be properly implemented).
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*
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* @discussion This method will be called on main thread.
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*/
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- (nullable id)additionalInfoForLayoutWithElements:(ASElementMap *)elements;
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/**
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* @abstract Prepares and returns a new layout for given context.
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*
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* @param context A context that contains all elements to be laid out and any additional information needed.
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*
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* @return The new layout calculated for the given context.
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*
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* @discussion This method is called ahead of time, i.e before the underlying collection/table view is aware of the provided elements.
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* As a result, this method should rely solely on the given context and should not reach out to other objects for information not available in the context.
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*
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* @discussion This method will be called on background theads. It must be thread-safe and should not change any internal state of this object.
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*
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* @discussion This method must block its calling thread. It can dispatch to other theads to reduce blocking time.
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*/
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- (ASCollectionLayoutState *)calculateLayoutWithContext:(ASCollectionLayoutContext *)context;
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@end
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NS_ASSUME_NONNULL_END
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