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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
53 lines
1.9 KiB
Objective-C
53 lines
1.9 KiB
Objective-C
//
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// ASCollectionLayoutState.m
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// AsyncDisplayKit
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//
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// Created by Huy Nguyen on 9/3/17.
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// Copyright © 2017 Facebook. All rights reserved.
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//
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#import <AsyncDisplayKit/ASCollectionLayoutState.h>
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#import <AsyncDisplayKit/ASAssert.h>
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#import <AsyncDisplayKit/ASCellNode+Internal.h>
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#import <AsyncDisplayKit/ASCollectionElement.h>
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#import <AsyncDisplayKit/ASElementMap.h>
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#import <AsyncDisplayKit/ASLayout.h>
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@implementation ASCollectionLayoutState
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- (instancetype)initWithElements:(ASElementMap *)elements layout:(ASLayout *)layout
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{
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NSMapTable<ASCollectionElement *, UICollectionViewLayoutAttributes *> *attrsMap = [NSMapTable mapTableWithKeyOptions:(NSMapTableObjectPointerPersonality | NSMapTableWeakMemory) valueOptions:NSMapTableStrongMemory];
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for (ASLayout *sublayout in layout.sublayouts) {
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ASCollectionElement *element = ((ASCellNode *)sublayout.layoutElement).collectionElement;
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NSIndexPath *indexPath = [elements indexPathForElement:element];
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NSString *supplementaryElementKind = element.supplementaryElementKind;
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UICollectionViewLayoutAttributes *attrs;
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if (supplementaryElementKind == nil) {
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attrs = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];
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} else {
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attrs = [UICollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:supplementaryElementKind withIndexPath:indexPath];
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}
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attrs.frame = sublayout.frame;
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[attrsMap setObject:attrs forKey:element];
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}
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return [self initWithElements:elements contentSize:layout.size elementToLayoutArrtibutesMap:attrsMap];
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}
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- (instancetype)initWithElements:(ASElementMap *)elements contentSize:(CGSize)contentSize elementToLayoutArrtibutesMap:(NSMapTable<ASCollectionElement *,UICollectionViewLayoutAttributes *> *)attrsMap
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{
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self = [super init];
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if (self) {
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_elements = elements;
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_contentSize = contentSize;
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_elementToLayoutArrtibutesMap = attrsMap;
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}
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return self;
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}
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@end
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