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Code Issues Packages Projects Releases Wiki Activity

Better decision on when to use full range

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This commit is contained in:
Huy Nguyen 2016-02-01 22:14:03 -08:00
parent 191d978154
commit 1145b6e40e
1 changed files with 23 additions and 8 deletions
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29
AsyncDisplayKit/Details/ASRangeControllerBeta.mm
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@ -17,6 +17,12 @@
#import "ASInternalHelpers.h"
#import "ASDisplayNode+FrameworkPrivate.h"
typedef NS_ENUM(NSUInteger, ASRangeTypeUsed) {
ASRangeTypeUsedNone,
ASRangeTypeUsedMinimum,
ASRangeTypeUsedFull,
};
@interface ASRangeControllerBeta ()
{
BOOL _rangeIsValid;
@ -24,7 +30,7 @@
BOOL _layoutControllerImplementsSetVisibleIndexPaths;
ASScrollDirection _scrollDirection;
NSSet<NSIndexPath *> *_allPreviousIndexPaths;
BOOL _didUseFullRange;
ASRangeTypeUsed _rangeTypeUsed;
}
@end
@ -38,6 +44,7 @@
}
_rangeIsValid = YES;
_rangeTypeUsed = ASRangeTypeUsedNone;
return self;
}
@ -47,7 +54,11 @@
- (void)visibleNodeIndexPathsDidChangeWithScrollDirection:(ASScrollDirection)scrollDirection
{
_scrollDirection = scrollDirection;
[self scheduleRangeUpdate];
}
- (void)scheduleRangeUpdate
{
if (_queuedRangeUpdate) {
return;
}
@ -108,19 +119,23 @@
ASInterfaceState selfInterfaceState = [_dataSource interfaceStateForRangeController:self];
BOOL selfIsVisible = (ASInterfaceStateIncludesVisible(selfInterfaceState));
BOOL selfIsScrolling = (_scrollDirection != ASScrollDirectionNone);
BOOL didUseMinimumRange = (_rangeTypeUsed == ASRangeTypeUsedMinimum);
BOOL didUseFullRange = (_rangeTypeUsed == ASRangeTypeUsedFull);
// If we are already visible and scrolling, get busy! Better get started on preloading before the user scrolls more...
// If we are already visible and did finish displaying minimum range, extend to full range
// If we used full range, don't switch to minimum range now. That will destroy all the hard work done before.
BOOL shouldUseFullRange = ((selfIsVisible && selfIsScrolling) || _didUseFullRange);
BOOL useFullRange = ((selfIsVisible && (selfIsScrolling || didUseMinimumRange)) || didUseFullRange);
NSLog(@"%@ range: %@", useFullRange ? @"Full" : @"Minimum", [((ASCollectionView *)_delegate).asyncDelegate description]);
fetchDataIndexPaths = [_layoutController indexPathsForScrolling:_scrollDirection rangeType:ASLayoutRangeTypeFetchData shouldUseFullRange:shouldUseFullRange];
fetchDataIndexPaths = [_layoutController indexPathsForScrolling:_scrollDirection rangeType:ASLayoutRangeTypeFetchData shouldUseFullRange:useFullRange];
ASRangeTuningParameters parametersDisplay = [_layoutController tuningParametersForRangeType:ASLayoutRangeTypeDisplay isFullRange:shouldUseFullRange];
ASRangeTuningParameters parametersFetchData = [_layoutController tuningParametersForRangeType:ASLayoutRangeTypeFetchData isFullRange:shouldUseFullRange];
ASRangeTuningParameters parametersDisplay = [_layoutController tuningParametersForRangeType:ASLayoutRangeTypeDisplay isFullRange:useFullRange];
ASRangeTuningParameters parametersFetchData = [_layoutController tuningParametersForRangeType:ASLayoutRangeTypeFetchData isFullRange:useFullRange];
if (parametersDisplay.leadingBufferScreenfuls == parametersFetchData.leadingBufferScreenfuls &&
parametersDisplay.trailingBufferScreenfuls == parametersFetchData.trailingBufferScreenfuls) {
displayIndexPaths = fetchDataIndexPaths;
} else {
displayIndexPaths = [_layoutController indexPathsForScrolling:_scrollDirection rangeType:ASLayoutRangeTypeDisplay shouldUseFullRange:shouldUseFullRange];
displayIndexPaths = [_layoutController indexPathsForScrolling:_scrollDirection rangeType:ASLayoutRangeTypeDisplay shouldUseFullRange:useFullRange];
}
// Typically the fetchDataIndexPaths will be the largest, and be a superset of the others, though it may be disjoint.
@ -136,7 +151,7 @@
NSSet<NSIndexPath *> *allCurrentIndexPaths = [[allIndexPaths set] copy];
[allIndexPaths unionSet:_allPreviousIndexPaths];
_allPreviousIndexPaths = allCurrentIndexPaths;
_didUseFullRange = shouldUseFullRange;
_rangeTypeUsed = useFullRange ? ASRangeTypeUsedFull : ASRangeTypeUsedMinimum;
if (!_rangeIsValid) {
[allIndexPaths addObjectsFromArray:ASIndexPathsForMultidimensionalArray(allNodes)];