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* [License] Simplify the Texture license to be pure Apache 2 (removing ASDK-Licenses) With permission of the Facebook Open Source team, we are simplifying the Texture license so that clients can rely on the Apache 2 terms that most of Texture is already covered by. This means that code originally forked from AsyncDisplayKit will be re-licensed from "BSD 3-clause + PATENTS v2" to Apache 2 without a PATENTS file. After getting confirmation that the updates to these core files look good, we'll propagate this new license header to all files (in this same PR) and get sign-off from all parties before landing. * [License] Update all Texture source files to be pure Apache 2. * Changelog entry for Apache 2 license update. * Revert "[License] Update all Texture source files to be pure Apache 2." This reverts commit ffa0fbbba9717d871dd16c4b07539f2f8208fc2b. * [License] Update all Texture source files to be pure Apache 2, maintaining copyrights. * [License] Update CONTRIBUTING, README, Podspec & Dangerfile.
138 lines
6.9 KiB
Plaintext
138 lines
6.9 KiB
Plaintext
//
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// ASCollectionGalleryLayoutDelegate.mm
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// Texture
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//
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// Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASCollectionGalleryLayoutDelegate.h>
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#import <AsyncDisplayKit/_ASCollectionGalleryLayoutInfo.h>
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#import <AsyncDisplayKit/_ASCollectionGalleryLayoutItem.h>
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#import <AsyncDisplayKit/ASAssert.h>
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#import <AsyncDisplayKit/ASCellNode.h>
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#import <AsyncDisplayKit/ASCollectionElement.h>
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#import <AsyncDisplayKit/ASCollections.h>
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#import <AsyncDisplayKit/ASCollectionLayoutContext.h>
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#import <AsyncDisplayKit/ASCollectionLayoutDefines.h>
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#import <AsyncDisplayKit/ASCollectionLayoutState.h>
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#import <AsyncDisplayKit/ASElementMap.h>
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#import <AsyncDisplayKit/ASLayout.h>
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#import <AsyncDisplayKit/ASLayoutRangeType.h>
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#import <AsyncDisplayKit/ASInsetLayoutSpec.h>
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#import <AsyncDisplayKit/ASStackLayoutSpec.h>
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#pragma mark - ASCollectionGalleryLayoutDelegate
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@implementation ASCollectionGalleryLayoutDelegate {
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ASScrollDirection _scrollableDirections;
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struct {
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unsigned int minimumLineSpacingForElements:1;
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unsigned int minimumInteritemSpacingForElements:1;
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unsigned int sectionInsetForElements:1;
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} _propertiesProviderFlags;
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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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// Scrollable directions must be either vertical or horizontal, but not both
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ASDisplayNodeAssertTrue(ASScrollDirectionContainsVerticalDirection(scrollableDirections)
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|| ASScrollDirectionContainsHorizontalDirection(scrollableDirections));
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ASDisplayNodeAssertFalse(ASScrollDirectionContainsVerticalDirection(scrollableDirections)
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&& ASScrollDirectionContainsHorizontalDirection(scrollableDirections));
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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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- (void)setPropertiesProvider:(id<ASCollectionGalleryLayoutPropertiesProviding>)propertiesProvider
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{
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ASDisplayNodeAssertMainThread();
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if (propertiesProvider == nil) {
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_propertiesProvider = nil;
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_propertiesProviderFlags = {};
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} else {
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_propertiesProvider = propertiesProvider;
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_propertiesProviderFlags.minimumLineSpacingForElements = [_propertiesProvider respondsToSelector:@selector(galleryLayoutDelegate:minimumLineSpacingForElements:)];
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_propertiesProviderFlags.minimumInteritemSpacingForElements = [_propertiesProvider respondsToSelector:@selector(galleryLayoutDelegate:minimumInteritemSpacingForElements:)];
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_propertiesProviderFlags.sectionInsetForElements = [_propertiesProvider respondsToSelector:@selector(galleryLayoutDelegate:sectionInsetForElements:)];
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}
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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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id<ASCollectionGalleryLayoutPropertiesProviding> propertiesProvider = _propertiesProvider;
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if (propertiesProvider == nil) {
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return nil;
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}
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CGSize itemSize = [propertiesProvider galleryLayoutDelegate:self sizeForElements:elements];
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UIEdgeInsets sectionInset = _propertiesProviderFlags.sectionInsetForElements ? [propertiesProvider galleryLayoutDelegate:self sectionInsetForElements:elements] : UIEdgeInsetsZero;
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CGFloat lineSpacing = _propertiesProviderFlags.minimumLineSpacingForElements ? [propertiesProvider galleryLayoutDelegate:self minimumLineSpacingForElements:elements] : 0.0;
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CGFloat interitemSpacing = _propertiesProviderFlags.minimumInteritemSpacingForElements ? [propertiesProvider galleryLayoutDelegate:self minimumInteritemSpacingForElements:elements] : 0.0;
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return [[_ASCollectionGalleryLayoutInfo alloc] initWithItemSize:itemSize
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minimumLineSpacing:lineSpacing
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minimumInteritemSpacing:interitemSpacing
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sectionInset:sectionInset];
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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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CGSize pageSize = context.viewportSize;
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ASScrollDirection scrollableDirections = context.scrollableDirections;
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_ASCollectionGalleryLayoutInfo *info = ASDynamicCast(context.additionalInfo, _ASCollectionGalleryLayoutInfo);
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CGSize itemSize = info.itemSize;
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if (info == nil || CGSizeEqualToSize(CGSizeZero, itemSize)) {
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return [[ASCollectionLayoutState alloc] initWithContext:context];
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}
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NSArray<_ASGalleryLayoutItem *> *children = ASArrayByFlatMapping(elements.itemElements,
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ASCollectionElement *element,
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[[_ASGalleryLayoutItem alloc] initWithItemSize:itemSize collectionElement:element]);
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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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// Use a stack spec to calculate layout content size and frames of all elements without actually measuring each element
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ASStackLayoutDirection stackDirection = ASScrollDirectionContainsVerticalDirection(scrollableDirections)
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? ASStackLayoutDirectionHorizontal
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: ASStackLayoutDirectionVertical;
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ASStackLayoutSpec *stackSpec = [ASStackLayoutSpec stackLayoutSpecWithDirection:stackDirection
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spacing:info.minimumInteritemSpacing
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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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lineSpacing:info.minimumLineSpacing
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children:children];
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stackSpec.concurrent = YES;
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ASLayoutSpec *finalSpec = stackSpec;
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UIEdgeInsets sectionInset = info.sectionInset;
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if (UIEdgeInsetsEqualToEdgeInsets(sectionInset, UIEdgeInsetsZero) == NO) {
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finalSpec = [ASInsetLayoutSpec insetLayoutSpecWithInsets:sectionInset child:stackSpec];
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}
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ASLayout *layout = [finalSpec layoutThatFits:ASSizeRangeForCollectionLayoutThatFitsViewportSize(pageSize, scrollableDirections)];
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return [[ASCollectionLayoutState alloc] initWithContext:context layout:layout getElementBlock:^ASCollectionElement * _Nullable(ASLayout * _Nonnull sublayout) {
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_ASGalleryLayoutItem *item = ASDynamicCast(sublayout.layoutElement, _ASGalleryLayoutItem);
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return item ? item.collectionElement : nil;
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}];
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}
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@end
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