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[Batch Fetching] Add ASBatchFetchingDelegate (#281)

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* Add ASBatchFetchingDelegate
- In addition to checking remaining leading screens, ASBatchFetching now also calculates a remaining time and consults its delegate if needed.
- The delegate can override the decision of ASBatchFetching, for example based on remaining time and average time of past batch requests.

* Fix up tests

* Update CHANGELOG
This commit is contained in:
Huy Nguyen
2017-05-17 13:26:30 +01:00
committed by GitHub
parent 432018cfdc
commit 8c45eaefce
12 changed files with 160 additions and 32 deletions
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13
Source/ASCollectionView.mm
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@@ -22,6 +22,7 @@
#import <AsyncDisplayKit/ASCollectionElement.h>
#import <AsyncDisplayKit/ASCollectionInternal.h>
#import <AsyncDisplayKit/ASCollectionLayout.h>
#import <AsyncDisplayKit/ASCollectionNode+Beta.h>
#import <AsyncDisplayKit/ASCollectionViewLayoutController.h>
#import <AsyncDisplayKit/ASCollectionViewLayoutFacilitatorProtocol.h>
#import <AsyncDisplayKit/ASCollectionViewFlowLayoutInspector.h>
@@ -1347,7 +1348,7 @@ static NSString * const kReuseIdentifier = @"_ASCollectionReuseIdentifier";
if (targetContentOffset != NULL) {
ASDisplayNodeAssert(_batchContext != nil, @"Batch context should exist");
[self _beginBatchFetchingIfNeededWithContentOffset:*targetContentOffset];
[self _beginBatchFetchingIfNeededWithContentOffset:*targetContentOffset velocity:velocity];
}
if (_asyncDelegateFlags.scrollViewWillEndDragging) {
@@ -1521,6 +1522,10 @@ static NSString * const kReuseIdentifier = @"_ASCollectionReuseIdentifier";
}
}
- (id<ASBatchFetchingDelegate>)batchFetchingDelegate{
return self.collectionNode.batchFetchingDelegate;
}
- (void)_scheduleCheckForBatchFetchingForNumberOfChanges:(NSUInteger)changes
{
// Prevent fetching will continually trigger in a loop after reaching end of content and no new content was provided
@@ -1542,12 +1547,12 @@ static NSString * const kReuseIdentifier = @"_ASCollectionReuseIdentifier";
return;
}
[self _beginBatchFetchingIfNeededWithContentOffset:self.contentOffset];
[self _beginBatchFetchingIfNeededWithContentOffset:self.contentOffset velocity:CGPointZero];
}
- (void)_beginBatchFetchingIfNeededWithContentOffset:(CGPoint)contentOffset
- (void)_beginBatchFetchingIfNeededWithContentOffset:(CGPoint)contentOffset velocity:(CGPoint)velocity
{
if (ASDisplayShouldFetchBatchForScrollView(self, self.scrollDirection, self.scrollableDirections, contentOffset)) {
if (ASDisplayShouldFetchBatchForScrollView(self, self.scrollDirection, self.scrollableDirections, contentOffset, velocity)) {
[self _beginBatchFetching];
}
}