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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
82 lines
3.0 KiB
Objective-C
82 lines
3.0 KiB
Objective-C
// ASCollectionFlowLayoutDelegate.m
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// AsyncDisplayKit
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//
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// Created by Huy Nguyen on 28/2/17.
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// Copyright © 2017 Facebook. All rights reserved.
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//
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#import <AsyncDisplayKit/ASCollectionFlowLayoutDelegate.h>
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#import <AsyncDisplayKit/ASCellNode.h>
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#import <AsyncDisplayKit/ASCollectionLayoutState.h>
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#import <AsyncDisplayKit/ASCollectionElement.h>
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#import <AsyncDisplayKit/ASCollectionLayoutContext.h>
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#import <AsyncDisplayKit/ASElementMap.h>
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#import <AsyncDisplayKit/ASLayout.h>
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#import <AsyncDisplayKit/ASStackLayoutSpec.h>
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@implementation ASCollectionFlowLayoutDelegate {
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ASScrollDirection _scrollableDirections;
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}
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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_scrollableDirections = ASScrollDirectionVerticalDirections;
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}
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return self;
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}
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- (instancetype)initWithScrollableDirections:(ASScrollDirection)scrollableDirections
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{
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self = [self init];
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if (self) {
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_scrollableDirections = scrollableDirections;
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}
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return self;
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}
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- (ASSizeRange)sizeRangeThatFits:(CGSize)viewportSize
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{
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ASSizeRange sizeRange = ASSizeRangeUnconstrained;
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if (ASScrollDirectionContainsVerticalDirection(_scrollableDirections) == NO) {
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sizeRange.min.height = viewportSize.height;
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sizeRange.max.height = viewportSize.height;
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}
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if (ASScrollDirectionContainsHorizontalDirection(_scrollableDirections) == NO) {
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sizeRange.min.width = viewportSize.width;
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sizeRange.max.width = viewportSize.width;
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}
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return sizeRange;
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}
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- (id)additionalInfoForLayoutWithElements:(ASElementMap *)elements
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{
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return nil;
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}
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- (ASCollectionLayoutState *)calculateLayoutWithContext:(ASCollectionLayoutContext *)context
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{
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ASElementMap *elements = context.elements;
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NSMutableArray<ASCellNode *> *children = ASArrayByFlatMapping(elements.itemElements, ASCollectionElement *element, element.node);
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if (children.count == 0) {
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return [[ASCollectionLayoutState alloc] initWithElements:elements
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contentSize:CGSizeZero
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elementToLayoutArrtibutesMap:[NSMapTable weakToStrongObjectsMapTable]];
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}
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ASStackLayoutSpec *stackSpec = [ASStackLayoutSpec stackLayoutSpecWithDirection:ASStackLayoutDirectionHorizontal
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spacing:0
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justifyContent:ASStackLayoutJustifyContentStart
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alignItems:ASStackLayoutAlignItemsStart
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flexWrap:ASStackLayoutFlexWrapWrap
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alignContent:ASStackLayoutAlignContentStart
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children:children];
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stackSpec.concurrent = YES;
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ASLayout *layout = [stackSpec layoutThatFits:[self sizeRangeThatFits:context.viewportSize]];
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return [[ASCollectionLayoutState alloc] initWithElements:elements layout:layout];
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}
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@end
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