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Don't pre-render cell nodes of collection view when it is not visible or not scrolling

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This commit is contained in:
Huy Nguyen
2016-01-31 00:53:28 -08:00
parent 6d2628104b
commit b889d81de8
4 changed files with 40 additions and 14 deletions
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32
AsyncDisplayKit/ASCollectionView.mm
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@@ -17,7 +17,6 @@
#import "ASDisplayNode+FrameworkPrivate.h"
#import "ASDisplayNode+Beta.h"
#import "ASInternalHelpers.h"
#import "ASRangeController.h"
#import "UICollectionViewLayout+ASConvenience.h"
#import "_ASDisplayLayer.h"
@@ -243,6 +242,19 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
return _flowLayoutInspector;
}
- (ASInterfaceState)interfaceState
{
ASCollectionNode *collectionNode = self.collectionNode;
if (collectionNode) {
return collectionNode.interfaceState;
} else {
// Until we can always create an associated ASCollectionNode without a retain cycle,
// we might be on our own to try to guess if we're visible. The node normally
// handles this even if it is the root / directly added to the view hierarchy.
return (self.window != nil ? ASInterfaceStateVisible : ASInterfaceStateNone);
}
}
#pragma mark -
#pragma mark Overrides.
@@ -535,16 +547,16 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
ASScrollDirection scrollableDirections = [self scrollableDirections];
if (ASScrollDirectionContainsHorizontalDirection(scrollableDirections)) { // Can scroll horizontally.
if (scrollVelocity.x >= 0) {
if (scrollVelocity.x > 0) {
direction |= ASScrollDirectionRight;
} else {
} else if (scrollVelocity.x < 0) {
direction |= ASScrollDirectionLeft;
}
}
if (ASScrollDirectionContainsVerticalDirection(scrollableDirections)) { // Can scroll vertically.
if (scrollVelocity.y >= 0) {
if (scrollVelocity.y > 0) {
direction |= ASScrollDirectionDown;
} else {
} else if (scrollVelocity.y < 0) {
direction |= ASScrollDirectionUp;
}
}
@@ -829,15 +841,7 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
- (ASInterfaceState)interfaceStateForRangeController:(ASRangeController *)rangeController
{
ASCollectionNode *collectionNode = self.collectionNode;
if (collectionNode) {
return self.collectionNode.interfaceState;
} else {
// Until we can always create an associated ASCollectionNode without a retain cycle,
// we might be on our own to try to guess if we're visible. The node normally
// handles this even if it is the root / directly added to the view hierarchy.
return (self.window != nil ? ASInterfaceStateVisible : ASInterfaceStateNone);
}
return self.interfaceState;
}
- (NSArray *)rangeController:(ASRangeController *)rangeController nodesAtIndexPaths:(NSArray *)indexPaths