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[ASCollectionView] Fix index space translation of Flow Layout Delegate methods. #467

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Oct 9, 2017
Merged

[ASCollectionView] Fix index space translation of Flow Layout Delegate methods. #467

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[ASCollectionView] Fix index space translation of Flow Layout Delegat…
appleguy Jul 23, 2017
dc188c6
Merge branch 'master' into ASCV_Passthrough
appleguy Oct 8, 2017
e2a9ffb
[ASCollectionView] Improve code sharing of UIKit size method calls; e…
appleguy Oct 8, 2017
6815de4
[ASCollectionView] Final method ordering and doc-comment for new _siz…
appleguy Oct 8, 2017
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1 change: 1 addition & 0 deletions CHANGELOG.md
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@@ -1,6 +1,7 @@
## master

* Add your own contributions to the next release on the line below this with your name.
- [ASCollectionView] Improve index space translation of Flow Layout Delegate methods. [Scott Goodson](https://github.com/appleguy)
- [ASCollectionView] Add delegate bridging and index space translation for missing UICollectionViewLayout properties. [Scott Goodson](https://github.com/appleguy)
- [ASTextNode2] Add initial implementation for link handling. [Scott Goodson](https://github.com/appleguy) [#396](https://github.com/TextureGroup/Texture/pull/396)
- [ASTextNode2] Provide compile flag to globally enable new implementation of ASTextNode: ASTEXTNODE_EXPERIMENT_GLOBAL_ENABLE. [Scott Goodson](https://github.com/appleguy) [#396](https://github.com/TextureGroup/Texture/pull/410)
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2 changes: 2 additions & 0 deletions Source/ASCollectionNode+Beta.h
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Expand Up @@ -67,6 +67,8 @@ NS_ASSUME_NONNULL_BEGIN

- (void)endUpdatesAnimated:(BOOL)animated completion:(nullable void (^)(BOOL))completion ASDISPLAYNODE_DEPRECATED_MSG("Use -performBatchUpdates:completion: instead.");

- (void)invalidateFlowLayoutDelegateMetrics;

@end

NS_ASSUME_NONNULL_END
4 changes: 4 additions & 0 deletions Source/ASCollectionNode.h
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Expand Up @@ -836,6 +836,10 @@ NS_ASSUME_NONNULL_BEGIN

- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath;

- (void)collectionView:(UICollectionView *)collectionView willDisplaySupplementaryView:(UICollectionReusableView *)view forElementKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath;

- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingSupplementaryView:(UICollectionReusableView *)view forElementOfKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath;

@end

NS_ASSUME_NONNULL_END
7 changes: 7 additions & 0 deletions Source/ASCollectionNode.mm
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Expand Up @@ -740,6 +740,13 @@ - (void)endUpdatesAnimated:(BOOL)animated completion:(void (^)(BOOL))completion
}
}

- (void)invalidateFlowLayoutDelegateMetrics {
ASDisplayNodeAssertMainThread();
if (self.nodeLoaded) {
[self.view invalidateFlowLayoutDelegateMetrics];
}
}

- (void)insertSections:(NSIndexSet *)sections
{
ASDisplayNodeAssertMainThread();
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101 changes: 78 additions & 23 deletions Source/ASCollectionView.mm
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Expand Up @@ -192,6 +192,8 @@ @interface ASCollectionView () <ASRangeControllerDataSource, ASRangeControllerDe
unsigned int interop:1;
unsigned int interopWillDisplayCell:1;
unsigned int interopDidEndDisplayingCell:1;
unsigned int interopWillDisplaySupplementaryView:1;
unsigned int interopdidEndDisplayingSupplementaryView:1;
} _asyncDelegateFlags;

struct {
Expand Down Expand Up @@ -522,6 +524,8 @@ - (void)setAsyncDelegate:(id<ASCollectionDelegate>)asyncDelegate
id<ASCollectionDelegateInterop> interopDelegate = (id<ASCollectionDelegateInterop>)_asyncDelegate;
_asyncDelegateFlags.interopWillDisplayCell = [interopDelegate respondsToSelector:@selector(collectionView:willDisplayCell:forItemAtIndexPath:)];
_asyncDelegateFlags.interopDidEndDisplayingCell = [interopDelegate respondsToSelector:@selector(collectionView:didEndDisplayingCell:forItemAtIndexPath:)];
_asyncDelegateFlags.interopWillDisplaySupplementaryView = [interopDelegate respondsToSelector:@selector(collectionView:willDisplaySupplementaryView:forElementKind:atIndexPath:)];
_asyncDelegateFlags.interopdidEndDisplayingSupplementaryView = [interopDelegate respondsToSelector:@selector(collectionView:didEndDisplayingSupplementaryView:forElementOfKind:atIndexPath:)];
}
}

Expand Down Expand Up @@ -761,6 +765,28 @@ - (void)setUsesSynchronousDataLoading:(BOOL)usesSynchronousDataLoading
self.dataController.usesSynchronousDataLoading = usesSynchronousDataLoading;
}

- (void)invalidateFlowLayoutDelegateMetrics {
UICollectionViewLayout *layout = self.collectionViewLayout;
CGSize defaultSize = ({
UICollectionViewFlowLayout *flowLayout = ASDynamicCast(layout, UICollectionViewFlowLayout);
flowLayout ? flowLayout.itemSize : CGSizeZero;
});

for (ASCollectionElement *element in self.dataController.pendingMap.itemElements) {
ASCellNode *node = element.node;
if (node.shouldUseUIKitCell) {
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  1. It's probably inconsequential, but maybe we should just ignore calls where the layout isn't a flow layout, rather than using size 0?

  2. Instead of building a giant array – I don't really like the itemElements property and may propose removing it – it's better to enumerate the map directly and if (element.supplementaryElementKind) { continue; } Note to self: add a UICollectionElementCategory elementCategory property to ASCollectionElement to simplify this distinction.

  3. Shouldn't we also refetch header/footer reference sizes here? Meshes well with 2

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@Adlai-Holler some merge conflicts have arisen, and I'm afraid my time availability is nearing a local minimum. :( Do you think this PR is acceptable to land as-is if the conflicts are fixed?

  1. I think it's better to have the 0 default, but indeed maybe no one will ever know :)
  2. The iteration suggestion sounds like an improvement for sure. I'm not sure I can commit to doing it only because I would have to get some test cases running to exercise the change.
  3. This seems potentially important, and indeed might motivate me to do Test PR #2.

Could you give me an Accept if you are comfortable with this, and then if I do 2 or 3, I can land without waiting?

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@Adlai-Holler It took me a while, but I finally got around to implementing your advice — and went quite a bit further. Thanks for suggesting these things, as they are improvements.

In particular, I was intentionally skipping over handling the update of supplementary element sizes, which is not great. That's now fixed and the code is better factored.

If you or @nguyenhuy can give me a sanity check review soon, I'd appreciate that - would like to merge this in pretty soon.

NSIndexPath *indexPath = [self indexPathForNode:node];
CGSize size = CGSizeZero;
if ([_asyncDelegate respondsToSelector:@selector(collectionView:layout:sizeForItemAtIndexPath:)]) {
size = [(id)_asyncDelegate collectionView:self layout:layout sizeForItemAtIndexPath:indexPath];
} else {
size = defaultSize;
}
node.style.preferredSize = size;
}
}
}

#pragma mark Internal

- (void)_configureCollectionViewLayout:(nonnull UICollectionViewLayout *)layout
Expand Down Expand Up @@ -959,15 +985,15 @@ - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSe
})

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)layout
sizeForItemAtIndexPath:(NSIndexPath *)indexPath
sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
ASDisplayNodeAssertMainThread();
ASCollectionElement *e = [_dataController.visibleMap elementForItemAtIndexPath:indexPath];
return e ? [self sizeForElement:e] : ASFlowLayoutDefault(layout, itemSize, CGSizeZero);
}

- (CGSize)collectionView:(UICollectionView *)cv layout:(UICollectionViewLayout *)l
referenceSizeForHeaderInSection:(NSInteger)section
referenceSizeForHeaderInSection:(NSInteger)section
{
ASDisplayNodeAssertMainThread();
ASElementMap *map = _dataController.visibleMap;
Expand All @@ -977,7 +1003,7 @@ - (CGSize)collectionView:(UICollectionView *)cv layout:(UICollectionViewLayout *
}

- (CGSize)collectionView:(UICollectionView *)cv layout:(UICollectionViewLayout *)l
referenceSizeForFooterInSection:(NSInteger)section
referenceSizeForFooterInSection:(NSInteger)section
{
ASDisplayNodeAssertMainThread();
ASElementMap *map = _dataController.visibleMap;
Expand All @@ -1000,7 +1026,7 @@ - (NSIndexPath *)delegateIndexPathForSection:(NSInteger)section withSelector:(SE
}

- (UIEdgeInsets)collectionView:(UICollectionView *)cv layout:(UICollectionViewLayout *)l
insetForSectionAtIndex:(NSInteger)section
insetForSectionAtIndex:(NSInteger)section
{
NSIndexPath *indexPath = [self delegateIndexPathForSection:section withSelector:_cmd];
if (indexPath) {
Expand All @@ -1010,23 +1036,23 @@ - (UIEdgeInsets)collectionView:(UICollectionView *)cv layout:(UICollectionViewLa
}

- (CGFloat)collectionView:(UICollectionView *)cv layout:(UICollectionViewLayout *)l
minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
NSIndexPath *indexPath = [self delegateIndexPathForSection:section withSelector:_cmd];
if (indexPath) {
return [(id)_asyncDelegate collectionView:cv layout:l
minimumInteritemSpacingForSectionAtIndex:indexPath.section];
minimumInteritemSpacingForSectionAtIndex:indexPath.section];
}
return ASFlowLayoutDefault(l, minimumInteritemSpacing, 10.0); // Default is documented as 10.0
}

- (CGFloat)collectionView:(UICollectionView *)cv layout:(UICollectionViewLayout *)l
minimumLineSpacingForSectionAtIndex:(NSInteger)section
minimumLineSpacingForSectionAtIndex:(NSInteger)section
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🙂

{
NSIndexPath *indexPath = [self delegateIndexPathForSection:section withSelector:_cmd];
if (indexPath) {
return [(id)_asyncDelegate collectionView:cv layout:l
minimumLineSpacingForSectionAtIndex:indexPath.section];
minimumLineSpacingForSectionAtIndex:indexPath.section];
}
return ASFlowLayoutDefault(l, minimumLineSpacing, 10.0); // Default is documented as 10.0
}
Expand All @@ -1036,7 +1062,7 @@ - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView
if ([_registeredSupplementaryKinds containsObject:kind] == NO) {
[self registerSupplementaryNodeOfKind:kind];
}

UICollectionReusableView *view = nil;
ASCollectionElement *element = [_dataController.visibleMap supplementaryElementOfKind:kind atIndexPath:indexPath];
ASCellNode *node = element.node;
Expand Down Expand Up @@ -1087,7 +1113,11 @@ - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cell
- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)rawCell forItemAtIndexPath:(NSIndexPath *)indexPath
{
if (_asyncDelegateFlags.interopWillDisplayCell) {
[(id <ASCollectionDelegateInterop>)_asyncDelegate collectionView:collectionView willDisplayCell:rawCell forItemAtIndexPath:indexPath];
ASCellNode *node = [self nodeForItemAtIndexPath:indexPath];
NSIndexPath *modelIndexPath = [self indexPathForNode:node];
if (modelIndexPath && node.shouldUseUIKitCell) {
[(id <ASCollectionDelegateInterop>)_asyncDelegate collectionView:collectionView willDisplayCell:rawCell forItemAtIndexPath:modelIndexPath];
}
}

_ASCollectionViewCell *cell = ASDynamicCastStrict(rawCell, _ASCollectionViewCell);
Expand Down Expand Up @@ -1144,7 +1174,11 @@ - (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICol
- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)rawCell forItemAtIndexPath:(NSIndexPath *)indexPath
{
if (_asyncDelegateFlags.interopDidEndDisplayingCell) {
[(id <ASCollectionDelegateInterop>)_asyncDelegate collectionView:collectionView didEndDisplayingCell:rawCell forItemAtIndexPath:indexPath];
ASCellNode *node = [self nodeForItemAtIndexPath:indexPath];
NSIndexPath *modelIndexPath = [self indexPathForNode:node];
if (modelIndexPath && node.shouldUseUIKitCell) {
[(id <ASCollectionDelegateInterop>)_asyncDelegate collectionView:collectionView didEndDisplayingCell:rawCell forItemAtIndexPath:modelIndexPath];
}
}

_ASCollectionViewCell *cell = ASDynamicCastStrict(rawCell, _ASCollectionViewCell);
Expand Down Expand Up @@ -1185,6 +1219,14 @@ - (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(

- (void)collectionView:(UICollectionView *)collectionView willDisplaySupplementaryView:(UICollectionReusableView *)rawView forElementKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath
{
if (_asyncDelegateFlags.interopWillDisplaySupplementaryView) {
ASCellNode *node = [self nodeForItemAtIndexPath:indexPath];
NSIndexPath *modelIndexPath = [self indexPathForNode:node];
if (modelIndexPath && node.shouldUseUIKitCell) {
[(id <ASCollectionDelegateInterop>)_asyncDelegate collectionView:collectionView willDisplaySupplementaryView:rawView forElementKind:elementKind atIndexPath:modelIndexPath];
}
}

_ASCollectionReusableView *view = ASDynamicCastStrict(rawView, _ASCollectionReusableView);
if (view == nil) {
return;
Expand Down Expand Up @@ -1218,6 +1260,14 @@ - (void)collectionView:(UICollectionView *)collectionView willDisplaySupplementa

- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingSupplementaryView:(UICollectionReusableView *)rawView forElementOfKind:(NSString *)elementKind atIndexPath:(NSIndexPath *)indexPath
{
if (_asyncDelegateFlags.interopdidEndDisplayingSupplementaryView) {
ASCellNode *node = [self nodeForItemAtIndexPath:indexPath];
NSIndexPath *modelIndexPath = [self indexPathForNode:node];
if (modelIndexPath && node.shouldUseUIKitCell) {
[(id <ASCollectionDelegateInterop>)_asyncDelegate collectionView:collectionView didEndDisplayingSupplementaryView:rawView forElementOfKind:elementKind atIndexPath:modelIndexPath];
}
}

_ASCollectionReusableView *view = ASDynamicCastStrict(rawView, _ASCollectionReusableView);
if (view == nil) {
return;
Expand Down Expand Up @@ -1416,9 +1466,11 @@ - (void)scrollViewDidScroll:(UIScrollView *)scrollView
[self _checkForBatchFetching];
}

for (_ASCollectionViewCell *cell in _cellsForVisibilityUpdates) {
for (_ASCollectionViewCell *collectionCell in _cellsForVisibilityUpdates) {
// Only nodes that respond to the selector are added to _cellsForVisibilityUpdates
[cell cellNodeVisibilityEvent:ASCellNodeVisibilityEventVisibleRectChanged inScrollView:scrollView];
[[collectionCell node] cellNodeVisibilityEvent:ASCellNodeVisibilityEventVisibleRectChanged
inScrollView:scrollView
withCellFrame:collectionCell.frame];
}
if (_asyncDelegateFlags.scrollViewDidScroll) {
[_asyncDelegate scrollViewDidScroll:scrollView];
Expand Down Expand Up @@ -1705,15 +1757,16 @@ - (ASCellNodeBlock)dataController:(ASDataController *)dataController nodeBlockAt
CGSize preferredSize = CGSizeZero;
SEL sizeForItem = @selector(collectionView:layout:sizeForItemAtIndexPath:);
if ([_asyncDelegate respondsToSelector:sizeForItem]) {
preferredSize = [(id)_asyncDelegate collectionView:self layout:layout sizeForItemAtIndexPath:indexPath];
preferredSize = [(id)_asyncDelegate collectionView:self layout:layout
sizeForItemAtIndexPath:indexPath];
} else {
preferredSize = ASFlowLayoutDefault(layout, itemSize, CGSizeZero);
}
block = ^{
ASCellNode *node = [[ASCellNode alloc] init];
node.shouldUseUIKitCell = YES;
node.style.preferredSize = preferredSize;
return node;
ASCellNode *cell = [[ASCellNode alloc] init];
cell.shouldUseUIKitCell = YES;
cell.style.preferredSize = preferredSize;
return cell;
};
} else {
ASDisplayNodeFailAssert(@"ASCollection could not get a node block for item at index path %@: %@, %@. If you are trying to display a UICollectionViewCell, make sure your dataSource conforms to the <ASCollectionDataSourceInterop> protocol!", indexPath, cell, block);
Expand Down Expand Up @@ -1811,15 +1864,15 @@ - (ASCellNodeBlock)dataController:(ASDataController *)dataController supplementa
SEL sizeForHeader = @selector(collectionView:layout:referenceSizeForHeaderInSection:);
if ([_asyncDelegate respondsToSelector:sizeForHeader]) {
preferredSize = [(id)_asyncDelegate collectionView:self layout:layout
referenceSizeForHeaderInSection:indexPath.section];
referenceSizeForHeaderInSection:indexPath.section];
} else {
preferredSize = ASFlowLayoutDefault(layout, headerReferenceSize, CGSizeZero);
}
} else if ([kind isEqualToString:UICollectionElementKindSectionFooter]) {
SEL sizeForFooter = @selector(collectionView:layout:referenceSizeForFooterInSection:);
if ([_asyncDelegate respondsToSelector:sizeForFooter]) {
preferredSize = [(id)_asyncDelegate collectionView:self layout:layout
referenceSizeForFooterInSection:indexPath.section];
referenceSizeForFooterInSection:indexPath.section];
} else {
preferredSize = ASFlowLayoutDefault(layout, footerReferenceSize, CGSizeZero);
}
Expand Down Expand Up @@ -2196,10 +2249,12 @@ - (void)layer:(CALayer *)layer didChangeBoundsWithOldValue:(CGRect)oldBounds new
BOOL changedInNonScrollingDirection = (fixedHorizontally && newBounds.size.width != lastUsedSize.width) || (fixedVertically && newBounds.size.height != lastUsedSize.height);

if (changedInNonScrollingDirection) {
[_dataController relayoutAllNodes];
[_dataController waitUntilAllUpdatesAreCommitted];
// We need to ensure the size requery is done before we update our layout.
// Because -invalidateLayout doesn't trigger any operations by itself, and we answer queries from UICollectionView using layoutThatFits:,
// we invalidate the layout before we have updated all of the cells. Any cells that the collection needs the size of immediately will get
// -layoutThatFits: with a new constraint, on the main thread, and synchronously calculate them. Meanwhile, relayoutAllNodes will update
// the layout of any remaining nodes on background threads (and fast-return for any nodes that the UICV got to first).
[self.collectionViewLayout invalidateLayout];
[_dataController relayoutAllNodes];
}
}

Expand Down
4 changes: 2 additions & 2 deletions Source/Base/ASAssert.h
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Expand Up @@ -64,8 +64,8 @@
#define ASDisplayNodeConditionalAssert(shouldTestCondition, condition, desc, ...) ASDisplayNodeAssert((!(shouldTestCondition) || (condition)), desc, ##__VA_ARGS__)
#define ASDisplayNodeConditionalCAssert(shouldTestCondition, condition, desc, ...) ASDisplayNodeCAssert((!(shouldTestCondition) || (condition)), desc, ##__VA_ARGS__)

#define ASDisplayNodeCAssertPositiveReal(description, num) ASDisplayNodeCAssert(num >= 0 && num <= CGFLOAT_MAX, @"%@ must be a real positive integer.", description)
#define ASDisplayNodeCAssertInfOrPositiveReal(description, num) ASDisplayNodeCAssert(isinf(num) || (num >= 0 && num <= CGFLOAT_MAX), @"%@ must be infinite or a real positive integer.", description)
#define ASDisplayNodeCAssertPositiveReal(description, num) ASDisplayNodeCAssert(num >= 0 && num <= CGFLOAT_MAX, @"%@ must be a real positive integer: %f.", description, (CGFloat)num)
#define ASDisplayNodeCAssertInfOrPositiveReal(description, num) ASDisplayNodeCAssert(isinf(num) || (num >= 0 && num <= CGFLOAT_MAX), @"%@ must be infinite or a real positive integer: %f.", description, (CGFloat)num)
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🙌


#define ASDisplayNodeErrorDomain @"ASDisplayNodeErrorDomain"
#define ASDisplayNodeNonFatalErrorCode 1
Expand Down
4 changes: 2 additions & 2 deletions Source/Details/ASElementMap.m
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Expand Up @@ -218,7 +218,7 @@ - (NSString *)description
- (BOOL)sectionIndexIsValid:(NSInteger)section assert:(BOOL)assert
{
NSInteger sectionCount = _sectionsOfItems.count;
if (section >= sectionCount) {
if (section >= sectionCount || section < 0) {
if (assert) {
ASDisplayNodeFailAssert(@"Invalid section index %zd when there are only %zd sections!", section, sectionCount);
}
Expand Down Expand Up @@ -246,7 +246,7 @@ - (BOOL)itemIndexPathIsValid:(NSIndexPath *)indexPath assert:(BOOL)assert item:(

NSInteger itemCount = _sectionsOfItems[section].count;
NSInteger item = indexPath.item;
if (item >= itemCount) {
if (item >= itemCount || item < 0) {
if (assert) {
ASDisplayNodeFailAssert(@"Invalid item index %zd in section %zd which only has %zd items!", item, section, itemCount);
}
Expand Down
5 changes: 5 additions & 0 deletions Source/Private/ASCollectionView+Undeprecated.h
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Expand Up @@ -292,6 +292,11 @@ NS_ASSUME_NONNULL_BEGIN
*/
- (nullable NSIndexPath *)indexPathForNode:(ASCellNode *)cellNode AS_WARN_UNUSED_RESULT;

/**
* Invalidates and recalculates the cached sizes stored for pass-through cells used in interop mode.
*/
- (void)invalidateFlowLayoutDelegateMetrics;

@end

NS_ASSUME_NONNULL_END