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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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15
Source/ASTableView.mm
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@@ -30,7 +30,7 @@
#import <AsyncDisplayKit/ASElementMap.h>
#import <AsyncDisplayKit/ASInternalHelpers.h>
#import <AsyncDisplayKit/ASLayout.h>
#import <AsyncDisplayKit/ASTableNode.h>
#import <AsyncDisplayKit/ASTableNode+Beta.h>
#import <AsyncDisplayKit/ASRangeController.h>
#import <AsyncDisplayKit/ASEqualityHelpers.h>
#import <AsyncDisplayKit/ASTableLayoutController.h>
@@ -1225,7 +1225,7 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
if (targetContentOffset != NULL) {
ASDisplayNodeAssert(_batchContext != nil, @"Batch context should exist");
[self _beginBatchFetchingIfNeededWithContentOffset:*targetContentOffset];
[self _beginBatchFetchingIfNeededWithContentOffset:*targetContentOffset velocity:velocity];
}
if (_asyncDelegateFlags.scrollViewWillEndDragging) {
@@ -1381,6 +1381,11 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
}
}
- (id<ASBatchFetchingDelegate>)batchFetchingDelegate
{
return self.tableNode.batchFetchingDelegate;
}
- (void)_scheduleCheckForBatchFetchingForNumberOfChanges:(NSUInteger)changes
{
// Prevent fetching will continually trigger in a loop after reaching end of content and no new content was provided
@@ -1402,12 +1407,12 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
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, ASScrollDirectionVerticalDirections, contentOffset)) {
if (ASDisplayShouldFetchBatchForScrollView(self, self.scrollDirection, ASScrollDirectionVerticalDirections, contentOffset, velocity)) {
[self _beginBatchFetching];
}
}