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80 lines
3.0 KiB
Objective-C
80 lines
3.0 KiB
Objective-C
//
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// ASCollectionViewLayoutInspector.m
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// AsyncDisplayKit
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//
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// Created by Garrett Moon on 11/19/16.
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// Copyright © 2016 Facebook. All rights reserved.
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//
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#import <AsyncDisplayKit/ASCollectionViewLayoutInspector.h>
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#import <AsyncDisplayKit/ASCollectionView.h>
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#import <AsyncDisplayKit/ASCollectionView+Undeprecated.h>
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#import <AsyncDisplayKit/ASCollectionNode.h>
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#pragma mark - Helper Functions
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// Returns a constrained size to let the cells layout itself as far as possible based on the scrollable direction
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// of the collection view
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ASSizeRange NodeConstrainedSizeForScrollDirection(ASCollectionView *collectionView) {
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CGSize maxSize = collectionView.bounds.size;
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if (ASScrollDirectionContainsHorizontalDirection(collectionView.scrollableDirections)) {
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maxSize.width = CGFLOAT_MAX;
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} else {
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maxSize.height = CGFLOAT_MAX;
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}
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return ASSizeRangeMake(CGSizeZero, maxSize);
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}
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#pragma mark - ASCollectionViewLayoutInspector
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@implementation ASCollectionViewLayoutInspector {
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struct {
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unsigned int implementsConstrainedSizeForNodeAtIndexPathDeprecated:1;
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unsigned int implementsConstrainedSizeForNodeAtIndexPath:1;
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} _delegateFlags;
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}
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#pragma mark Lifecycle
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- (instancetype)initWithCollectionView:(ASCollectionView *)collectionView
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{
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return [self init];
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}
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#pragma mark ASCollectionViewLayoutInspecting
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- (void)didChangeCollectionViewDelegate:(id<ASCollectionDelegate>)delegate
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{
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if (delegate == nil) {
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memset(&_delegateFlags, 0, sizeof(_delegateFlags));
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} else {
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_delegateFlags.implementsConstrainedSizeForNodeAtIndexPathDeprecated = [delegate respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)];
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_delegateFlags.implementsConstrainedSizeForNodeAtIndexPath = [delegate respondsToSelector:@selector(collectionNode:constrainedSizeForItemAtIndexPath:)];
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}
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}
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- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath
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{
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if (_delegateFlags.implementsConstrainedSizeForNodeAtIndexPath) {
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return [collectionView.asyncDelegate collectionNode:collectionView.collectionNode constrainedSizeForItemAtIndexPath:indexPath];
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} else if (_delegateFlags.implementsConstrainedSizeForNodeAtIndexPathDeprecated) {
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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return [collectionView.asyncDelegate collectionView:collectionView constrainedSizeForNodeAtIndexPath:indexPath];
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#pragma clang diagnostic pop
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} else {
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// With 2.0 `collectionView:constrainedSizeForNodeAtIndexPath:` was moved to the delegate. Assert if not implemented on the delegate but on the data source
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ASDisplayNodeAssert([collectionView.asyncDataSource respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)] == NO, @"collectionView:constrainedSizeForNodeAtIndexPath: was moved from the ASCollectionDataSource to the ASCollectionDelegate.");
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}
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return NodeConstrainedSizeForScrollDirection(collectionView);
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}
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- (ASScrollDirection)scrollableDirections
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{
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return ASScrollDirectionNone;
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}
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@end
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