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[ASCollectionView] Move ASCollectionViewLayoutInspector to its own file

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Garrett Moon
2016-11-19 15:14:03 -08:00
parent 307a1a0ab6
commit 88d0dff09c
5 changed files with 237 additions and 153 deletions
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84
AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.m
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@@ -16,90 +16,6 @@
#define kDefaultItemSize CGSizeMake(50, 50)
#pragma mark - Helper Functions
// Returns a constrained size to let the cells layout itself as far as possible based on the scrollable direction
// of the collection view
static inline ASSizeRange NodeConstrainedSizeForScrollDirection(ASCollectionView *collectionView) {
CGSize maxSize = collectionView.bounds.size;
if (ASScrollDirectionContainsHorizontalDirection(collectionView.scrollableDirections)) {
maxSize.width = CGFLOAT_MAX;
} else {
maxSize.height = CGFLOAT_MAX;
}
return ASSizeRangeMake(CGSizeZero, maxSize);
}
#pragma mark - ASCollectionViewLayoutInspector
@implementation ASCollectionViewLayoutInspector {
struct {
unsigned int implementsConstrainedSizeForNodeAtIndexPathDeprecated:1;
unsigned int implementsConstrainedSizeForNodeAtIndexPath:1;
} _delegateFlags;
}
#pragma mark Lifecycle
- (instancetype)initWithCollectionView:(ASCollectionView *)collectionView
{
self = [super init];
if (self != nil) {
[self didChangeCollectionViewDelegate:collectionView.asyncDelegate];
}
return self;
}
#pragma mark ASCollectionViewLayoutInspecting
- (void)didChangeCollectionViewDelegate:(id<ASCollectionDelegate>)delegate
{
if (delegate == nil) {
memset(&_delegateFlags, 0, sizeof(_delegateFlags));
} else {
_delegateFlags.implementsConstrainedSizeForNodeAtIndexPathDeprecated = [delegate respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)];
_delegateFlags.implementsConstrainedSizeForNodeAtIndexPath = [delegate respondsToSelector:@selector(collectionNode:constrainedSizeForItemAtIndexPath:)];
}
}
- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath
{
if (_delegateFlags.implementsConstrainedSizeForNodeAtIndexPath) {
return [collectionView.asyncDelegate collectionNode:collectionView.collectionNode constrainedSizeForItemAtIndexPath:indexPath];
} else if (_delegateFlags.implementsConstrainedSizeForNodeAtIndexPathDeprecated) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
return [collectionView.asyncDelegate collectionView:collectionView constrainedSizeForNodeAtIndexPath:indexPath];
#pragma clang diagnostic pop
} else {
// With 2.0 `collectionView:constrainedSizeForNodeAtIndexPath:` was moved to the delegate. Assert if not implemented on the delegate but on the data source
ASDisplayNodeAssert([collectionView.asyncDataSource respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)] == NO, @"collectionView:constrainedSizeForNodeAtIndexPath: was moved from the ASCollectionDataSource to the ASCollectionDelegate.");
}
return NodeConstrainedSizeForScrollDirection(collectionView);
}
- (ASScrollDirection)scrollableDirections
{
ASDisplayNodeAssert(NO, @"layoutInspector object must implement -scrollableDirections %@", self);
return ASScrollDirectionNone;
}
- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForSupplementaryNodeOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
ASDisplayNodeAssert(NO, @"To support supplementary nodes in ASCollectionView, it must have a layoutInspector for layout inspection. (See ASCollectionViewFlowLayoutInspector for an example.)");
return ASSizeRangeMake(CGSizeZero, CGSizeZero);
}
- (NSUInteger)collectionView:(ASCollectionView *)collectionView supplementaryNodesOfKind:(NSString *)kind inSection:(NSUInteger)section
{
ASDisplayNodeAssert(NO, @"To support supplementary nodes in ASCollectionView, it must have a layoutInspector for layout inspection. (See ASCollectionViewFlowLayoutInspector for an example.)");
return 0;
}
@end
#pragma mark - ASCollectionViewFlowLayoutInspector
@interface ASCollectionViewFlowLayoutInspector ()