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Add constrainedSizeForNodeAtIndexPath to ASPagerNodeDataSource

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This commit is contained in:
Huy Nguyen 2016-02-11 10:47:27 -08:00
parent 5cccc0f432
commit 3e56a327c7
2 changed files with 20 additions and 1 deletions
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11
AsyncDisplayKit/ASPagerNode.h
View File

@ -50,6 +50,17 @@
*/
- (ASCellNodeBlock)pagerNode:(ASPagerNode *)pagerNode nodeBlockAtIndex:(NSInteger)index;
/**
* Provides the constrained size range for measuring the node at the index path.
*
* @param collectionView The sender.
*
* @param indexPath The index path of the node.
*
* @returns A constrained size range for layout the node at this index path.
*/
- (ASSizeRange)pagerNode:(ASPagerNode *)pagerNode constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath;
@end
@interface ASPagerNode : ASCollectionNode

10
AsyncDisplayKit/ASPagerNode.m
View File

@ -17,6 +17,7 @@
ASPagerNodeProxy *_proxy;
__weak id <ASPagerNodeDataSource> _pagerDataSource;
BOOL _pagerDataSourceImplementsNodeBlockAtIndex;
BOOL _pagerDataSourceImplementsConstrainedSizeForNode;
}
@end
@ -101,7 +102,10 @@
- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath
{
return ASSizeRangeMake(CGSizeZero, self.view.bounds.size);
if (_pagerDataSourceImplementsConstrainedSizeForNode) {
return [_pagerDataSource pagerNode:self constrainedSizeForNodeAtIndexPath:indexPath];
}
return ASSizeRangeMake(CGSizeZero, self.bounds.size);
}
#pragma mark - Data Source Proxy
@ -115,9 +119,13 @@
{
if (pagerDataSource != _pagerDataSource) {
_pagerDataSource = pagerDataSource;
_pagerDataSourceImplementsNodeBlockAtIndex = [_pagerDataSource respondsToSelector:@selector(pagerNode:nodeBlockAtIndex:)];
// Data source must implement pagerNode:nodeBlockAtIndex: or pagerNode:nodeAtIndex:
ASDisplayNodeAssertTrue(_pagerDataSourceImplementsNodeBlockAtIndex || [_pagerDataSource respondsToSelector:@selector(pagerNode:nodeAtIndex:)]);
_pagerDataSourceImplementsConstrainedSizeForNode = [_pagerDataSource respondsToSelector:@selector(pagerNode:constrainedSizeForNodeAtIndexPath:)];
_proxy = pagerDataSource ? [[ASPagerNodeProxy alloc] initWithTarget:pagerDataSource interceptor:self] : nil;
super.dataSource = (id <ASCollectionDataSource>)_proxy;