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* Add ASCollectionGalleryLayoutSizeProviding - This allows users to return different sizes based on certain conditions, such as the collection node's bounds or grid constants. - ASPagerNode will also act as a size provider to ensure all pages have an up-to-date size that is its bounds. * Update CHANGELOG * ASPagerNode to use gallery layout delegate if told to
85 lines
3.3 KiB
Objective-C
85 lines
3.3 KiB
Objective-C
//
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// ASCollectionFlowLayoutDelegate.m
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// Texture
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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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 /ASDK-Licenses directory of this source tree. An additional
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// grant of patent rights can be found in the PATENTS file in the same directory.
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//
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// Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
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// Pinterest, Inc. Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASCollectionFlowLayoutDelegate.h>
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#import <AsyncDisplayKit/ASCellNode+Internal.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/ASCollectionLayoutDefines.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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return [self initWithScrollableDirections:ASScrollDirectionVerticalDirections];
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}
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- (instancetype)initWithScrollableDirections:(ASScrollDirection)scrollableDirections
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{
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self = [super 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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- (ASScrollDirection)scrollableDirections
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{
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ASDisplayNodeAssertMainThread();
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return _scrollableDirections;
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}
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- (id)additionalInfoForLayoutWithElements:(ASElementMap *)elements
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{
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ASDisplayNodeAssertMainThread();
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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] initWithContext:context];
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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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ASSizeRange sizeRange = ASSizeRangeForCollectionLayoutThatFitsViewportSize(context.viewportSize, context.scrollableDirections);
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ASLayout *layout = [stackSpec layoutThatFits:sizeRange];
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return [[ASCollectionLayoutState alloc] initWithContext:context layout:layout getElementBlock:^ASCollectionElement * _Nonnull(ASLayout * _Nonnull sublayout) {
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return ((ASCellNode *)sublayout.layoutElement).collectionElement;
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}];
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}
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@end
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