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73 lines
2.7 KiB
Mathematica
73 lines
2.7 KiB
Mathematica
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#import "TGSharedMediaCollectionLayout.h"
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#import "TGSharedMediaSectionHeader.h"
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@interface TGSharedMediaCollectionLayout ()
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{
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bool _updatingCollectionItems;
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NSArray *_sectionHeaders;
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}
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@end
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@implementation TGSharedMediaCollectionLayout
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- (UICollectionViewLayoutAttributes *)initialLayoutAttributesForAppearingItemAtIndexPath:(NSIndexPath *)itemIndexPath
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{
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if (_updatingCollectionItems || itemIndexPath.section != 0)
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return [super initialLayoutAttributesForAppearingItemAtIndexPath:itemIndexPath];
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return nil;
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}
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- (UICollectionViewLayoutAttributes *)finalLayoutAttributesForDisappearingItemAtIndexPath:(NSIndexPath *)itemIndexPath
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{
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if (_updatingCollectionItems || itemIndexPath.section != 0)
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return [super finalLayoutAttributesForDisappearingItemAtIndexPath:itemIndexPath];
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return [self layoutAttributesForItemAtIndexPath:itemIndexPath];
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}
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- (void)prepareLayout
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{
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[super prepareLayout];
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NSMutableArray *sectionHeaders = [[NSMutableArray alloc] init];
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id<UICollectionViewDataSource> dataSource = self.collectionView.dataSource;
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NSUInteger numberOfSections = 1;
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if ([dataSource respondsToSelector:@selector(numberOfSectionsInCollectionView:)])
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numberOfSections = [dataSource numberOfSectionsInCollectionView:self.collectionView];
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for (NSUInteger i = 0; i < numberOfSections; i++)
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{
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NSUInteger itemCount = [dataSource collectionView:self.collectionView numberOfItemsInSection:i];
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if (itemCount != 0)
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{
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UICollectionViewLayoutAttributes *firstItemAttributes = [self layoutAttributesForItemAtIndexPath:[NSIndexPath indexPathForItem:0 inSection:i]];
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UICollectionViewLayoutAttributes *lastItemAttributes = [self layoutAttributesForItemAtIndexPath:[NSIndexPath indexPathForItem:itemCount - 1 inSection:i]];
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TGSharedMediaSectionHeader *sectionHeader = [[TGSharedMediaSectionHeader alloc] init];
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sectionHeader.index = i;
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CGFloat headerHeight = 36.0f;
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sectionHeader.bounds = CGRectMake(0.0f, 0.0f, self.collectionView.bounds.size.width, headerHeight);
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sectionHeader.floatingFrame = CGRectMake(0.0f, firstItemAttributes.frame.origin.y - sectionHeader.bounds.size.height, sectionHeader.bounds.size.width, CGRectGetMaxY(lastItemAttributes.frame) - (firstItemAttributes.frame.origin.y - sectionHeader.bounds.size.height));
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[sectionHeaders addObject:sectionHeader];
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}
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}
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_sectionHeaders = sectionHeaders;
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}
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- (NSArray *)sectionHeaders
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{
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return _sectionHeaders;
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}
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- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)__unused newBounds
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{
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return false;
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}
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@end
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