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Add a "Null Object" for a layout inspector if no no flow layout is given

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The purpose of the ASCollectionViewCustomLayoutInspector is to provide a default implementation if given a custom layout, but no layout inspector.
This commit is contained in:
Michael Schneider
2016-05-17 18:39:34 +02:00
parent 50ca58f7e0
commit 00d9372ee4
4 changed files with 74 additions and 41 deletions
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36
AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.m
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@@ -13,6 +13,35 @@
#import "ASAssert.h"
#import "ASEqualityHelpers.h"
@implementation ASCollectionViewCustomLayoutInspector
- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath
{
return ASSizeRangeMake(CGSizeZero, CGSizeZero);
}
- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForSupplementaryNodeOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
ASDisplayNodeAssert(NO, @"To support supplementary nodes in ASCollectionView, it must have a layoutDelegate for layout inspection. (See ASCollectionViewFlowLayoutInspector for an example.)");
return ASSizeRangeMake(CGSizeZero, CGSizeZero);
}
- (NSUInteger)collectionView:(ASCollectionView *)collectionView numberOfSectionsForSupplementaryNodeOfKind:(NSString *)kind
{
ASDisplayNodeAssert(NO, @"To support supplementary nodes in ASCollectionView, it must have a layoutDelegate for layout inspection. (See ASCollectionViewFlowLayoutInspector for an example.)");
return 0;
}
- (NSUInteger)collectionView:(ASCollectionView *)collectionView supplementaryNodesOfKind:(NSString *)kind inSection:(NSUInteger)section
{
ASDisplayNodeAssert(NO, @"To support supplementary nodes in ASCollectionView, it must have a layoutDelegate for layout inspection. (See ASCollectionViewFlowLayoutInspector for an example.)");
return 0;
}
@end
@implementation ASCollectionViewFlowLayoutInspector {
BOOL _delegateImplementsReferenceSizeForHeader;
BOOL _delegateImplementsReferenceSizeForFooter;
@@ -50,8 +79,11 @@
- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath
{
// TODO: Provide constrained size for flow layout item nodes
return ASSizeRangeMake(CGSizeZero, CGSizeZero);
if ([collectionView.asyncDataSource respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)]) {
return [collectionView.asyncDataSource collectionView:collectionView constrainedSizeForNodeAtIndexPath:indexPath];
} else {
return ASSizeRangeMake(_layout.itemSize, _layout.itemSize);
}
}
- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForSupplementaryNodeOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath