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Merge pull request #1102 from knopp/ASRangeControlller-get-index-paths-optimization

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[ASRangeController] don't get index paths twice if tuning parameters …
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appleguy
2016-01-24 18:19:02 -08:00
parent d70887448c 51e4476068
commit 2a63868e76
1 changed files with 9 additions and 1 deletions
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10
AsyncDisplayKit/Details/ASRangeControllerBeta.mm
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@@ -109,7 +109,15 @@
if (ASInterfaceStateIncludesVisible(selfInterfaceState)) {
// If we are already visible, get busy! Better get started on preloading before the user scrolls more...
fetchDataIndexPaths = [_layoutController indexPathsForScrolling:_scrollDirection rangeType:ASLayoutRangeTypeFetchData];
displayIndexPaths = [_layoutController indexPathsForScrolling:_scrollDirection rangeType:ASLayoutRangeTypeDisplay];
ASRangeTuningParameters parametersFetchData = [_layoutController tuningParametersForRangeType:ASLayoutRangeTypeFetchData];
ASRangeTuningParameters parametersDisplay = [_layoutController tuningParametersForRangeType:ASLayoutRangeTypeDisplay];
if (parametersDisplay.leadingBufferScreenfuls == parametersFetchData.leadingBufferScreenfuls &&
parametersDisplay.trailingBufferScreenfuls == parametersFetchData.trailingBufferScreenfuls) {
displayIndexPaths = fetchDataIndexPaths;
} else {
displayIndexPaths = [_layoutController indexPathsForScrolling:_scrollDirection rangeType:ASLayoutRangeTypeDisplay];
}
// Typically the fetchDataIndexPaths will be the largest, and be a superset of the others, though it may be disjoint.
// Because allIndexPaths is an NSMutableOrderedSet, this adds the non-duplicate items /after/ the existing items.