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validate that _pendingVisibleIndexPath is contiguous with visibleIndexPaths before appending it. Also, always return a sorted array of NSIndexPaths

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This commit is contained in:
Ethan Nagel
2015-06-24 13:18:12 -07:00
parent 0e37bff7c1
commit baf91b4a45
1 changed files with 19 additions and 1 deletions
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20
AsyncDisplayKit/ASTableView.mm
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@@ -522,11 +522,29 @@ void ASPerformBlockWithoutAnimation(BOOL withoutAnimation, void (^block)()) {
if ( _pendingVisibleIndexPath ) {
NSMutableSet *indexPaths = [NSMutableSet setWithArray:self.indexPathsForVisibleRows];
BOOL (^isNextTo)(NSIndexPath *, NSIndexPath *, int) = ^(NSIndexPath *indexPath, NSIndexPath *anchor, int dir) {
if (!anchor) {
return NO;
}
if (indexPath.section == anchor.section) {
return (indexPath.row == anchor.row+dir);
} else if (indexPath.section == anchor.section+dir && anchor.row == 0) {
NSIndexPath *toCompare = (dir==1) ? indexPath : anchor;
NSInteger lastRow = [_dataController numberOfRowsInSection:toCompare.section] - 1;
return (toCompare.row == lastRow);
} else {
return NO;
}
};
if ( [indexPaths containsObject:_pendingVisibleIndexPath]) {
_pendingVisibleIndexPath = nil; // once it has shown up in visibleIndexPaths, we can stop tracking it
} else if (!isNextTo(_pendingVisibleIndexPath, visibleIndexPaths.firstObject, -1) &&
!isNextTo(_pendingVisibleIndexPath, visibleIndexPaths.lastObject, +1)) {
_pendingVisibleIndexPath = nil; // not contiguous, ignore.
} else {
[indexPaths addObject:_pendingVisibleIndexPath];
visibleIndexPaths = indexPaths.allObjects;
visibleIndexPaths = [indexPaths.allObjects sortedArrayUsingSelector:@selector(compare:)];
}
}