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99 lines
3.4 KiB
Objective-C
99 lines
3.4 KiB
Objective-C
/* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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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 root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import <UIKit/UIKit.h>
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#import "ASCollectionViewFlowLayoutInspector.h"
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#import "ASCollectionView.h"
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@implementation ASCollectionViewFlowLayoutInspector {
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BOOL _delegateImplementsReferenceSizeForHeader;
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BOOL _delegateImplementsReferenceSizeForFooter;
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}
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#pragma mark - Accessors
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- (void)setLayout:(UICollectionViewFlowLayout *)layout
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{
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_layout = layout;
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_delegateImplementsReferenceSizeForHeader = [[self layoutDelegate] respondsToSelector:@selector(collectionView:layout:referenceSizeForHeaderInSection:)];
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_delegateImplementsReferenceSizeForFooter = [[self layoutDelegate] respondsToSelector:@selector(collectionView:layout:referenceSizeForFooterInSection:)];
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}
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#pragma mark - ASCollectionViewLayoutInspecting
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- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForSupplementaryNodeOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
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{
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CGSize constrainedSize = CGSizeMake(FLT_MAX, FLT_MAX);
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CGSize supplementarySize = [self sizeForSupplementaryViewOfKind:kind inSection:indexPath.section];
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if (_layout.scrollDirection == UICollectionViewScrollDirectionVertical) {
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constrainedSize.height = supplementarySize.height;
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} else {
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constrainedSize.width = supplementarySize.width;
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}
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return ASSizeRangeMake(CGSizeZero, constrainedSize);
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}
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- (NSUInteger)collectionView:(ASCollectionView *)collectionView numberOfSectionsForSupplementaryKind:(NSString *)kind
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{
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return [collectionView.asyncDataSource numberOfSectionsInCollectionView:collectionView];
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}
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- (NSUInteger)collectionView:(ASCollectionView *)collectionView supplementaryViewsOfKind:(NSString *)kind inSection:(NSUInteger)section
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{
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return [self layoutHasSupplementaryViewOfKind:kind inSection:section] ? 1 : 0;
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}
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#pragma mark - Private helpers
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- (CGSize)sizeForSupplementaryViewOfKind:(NSString *)kind inSection:(NSUInteger)section
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{
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if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {
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if (_delegateImplementsReferenceSizeForHeader) {
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return [[self layoutDelegate] collectionView:_collectionView layout:_layout referenceSizeForHeaderInSection:section];
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} else {
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return [self.layout headerReferenceSize];
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}
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} else if ([kind isEqualToString:UICollectionElementKindSectionFooter]) {
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if (_delegateImplementsReferenceSizeForFooter) {
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return [[self layoutDelegate] collectionView:_collectionView layout:_layout referenceSizeForFooterInSection:section];
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} else {
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return [self.layout footerReferenceSize];
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}
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} else {
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return CGSizeZero;
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}
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}
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- (BOOL)layoutHasSupplementaryViewOfKind:(NSString *)kind inSection:(NSUInteger)section
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{
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CGSize size = [self sizeForSupplementaryViewOfKind:kind inSection:section];
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if ([self usedLayoutValueForSize:size] > 0) {
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return YES;
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} else {
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return NO;
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}
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}
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- (CGFloat)usedLayoutValueForSize:(CGSize)size
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{
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if (_layout.scrollDirection == UICollectionViewScrollDirectionVertical) {
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return size.height;
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} else {
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return size.width;
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}
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}
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- (id<UICollectionViewDelegateFlowLayout>)layoutDelegate
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{
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return (id<UICollectionViewDelegateFlowLayout>)self.collectionView.delegate;
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}
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@end
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