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ASTableView.mm
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//
// ASTableView.mm
// Texture
//
// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
//
#import <AsyncDisplayKit/ASTableViewInternal.h>
#import <AsyncDisplayKit/_ASCoreAnimationExtras.h>
#import <AsyncDisplayKit/_ASDisplayLayer.h>
#import <AsyncDisplayKit/_ASHierarchyChangeSet.h>
#import <AsyncDisplayKit/ASAssert.h>
#import <AsyncDisplayKit/ASBatchFetching.h>
#import <AsyncDisplayKit/ASCellNode+Internal.h>
#import <AsyncDisplayKit/ASCollectionElement.h>
#import <AsyncDisplayKit/ASCollections.h>
#import <AsyncDisplayKit/ASConfigurationInternal.h>
#import <AsyncDisplayKit/ASDelegateProxy.h>
#import <AsyncDisplayKit/ASDisplayNodeExtras.h>
#import <AsyncDisplayKit/ASDisplayNode+FrameworkPrivate.h>
#import <AsyncDisplayKit/ASElementMap.h>
#import <AsyncDisplayKit/ASInternalHelpers.h>
#import <AsyncDisplayKit/ASLayout.h>
#import <AsyncDisplayKit/ASTableNode+Beta.h>
#import <AsyncDisplayKit/ASRangeController.h>
#import <AsyncDisplayKit/ASEqualityHelpers.h>
#import <AsyncDisplayKit/ASTableLayoutController.h>
#import <AsyncDisplayKit/ASTableView+Undeprecated.h>
#import <AsyncDisplayKit/ASBatchContext.h>
static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
//#define LOG(...) NSLog(__VA_ARGS__)
#define LOG(...)
/**
* See note at the top of ASCollectionView.mm near declaration of macro GET_COLLECTIONNODE_OR_RETURN
*/
#define GET_TABLENODE_OR_RETURN(__var, __val) \
ASTableNode *__var = self.tableNode; \
if (__var == nil) { \
return __val; \
}
#define UITABLEVIEW_RESPONDS_TO_SELECTOR() \
({ \
static BOOL superResponds; \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
superResponds = [UITableView instancesRespondToSelector:_cmd]; \
}); \
superResponds; \
})
@interface UITableView (ScrollViewDelegate)
- (void)scrollViewDidScroll:(UIScrollView *)scrollView;
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset;
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;
@end
#pragma mark -
#pragma mark ASCellNode<->UITableViewCell bridging.
@class _ASTableViewCell;
@protocol _ASTableViewCellDelegate <NSObject>
- (void)didLayoutSubviewsOfTableViewCell:(_ASTableViewCell *)tableViewCell;
@end
@interface _ASTableViewCell : UITableViewCell
@property (nonatomic, weak) id<_ASTableViewCellDelegate> delegate;
@property (nonatomic, readonly) ASCellNode *node;
@property (nonatomic) ASCollectionElement *element;
@end
@implementation _ASTableViewCell
// TODO add assertions to prevent use of view-backed UITableViewCell properties (eg .textLabel)
- (void)layoutSubviews
{
[super layoutSubviews];
[_delegate didLayoutSubviewsOfTableViewCell:self];
}
- (void)didTransitionToState:(UITableViewCellStateMask)state
{
[self setNeedsLayout];
[self layoutIfNeeded];
[super didTransitionToState:state];
}
- (ASCellNode *)node
{
return self.element.node;
}
- (void)setElement:(ASCollectionElement *)element
{
_element = element;
ASCellNode *node = element.node;
if (node) {
self.backgroundColor = node.backgroundColor;
self.selectedBackgroundView = node.selectedBackgroundView;
#if TARGET_OS_IOS
self.separatorInset = node.separatorInset;
#endif
self.selectionStyle = node.selectionStyle;
self.focusStyle = node.focusStyle;
self.accessoryType = node.accessoryType;
self.tintColor = node.tintColor;
// the following ensures that we clip the entire cell to it's bounds if node.clipsToBounds is set (the default)
// This is actually a workaround for a bug we are seeing in some rare cases (selected background view
// overlaps other cells if size of ASCellNode has changed.)
self.clipsToBounds = node.clipsToBounds;
}
[node __setSelectedFromUIKit:self.selected];
[node __setHighlightedFromUIKit:self.highlighted];
}
- (BOOL)consumesCellNodeVisibilityEvents
{
ASCellNode *node = self.node;
if (node == nil) {
return NO;
}
return ASSubclassOverridesSelector([ASCellNode class], [node class], @selector(cellNodeVisibilityEvent:inScrollView:withCellFrame:));
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
[self.node __setSelectedFromUIKit:selected];
}
- (void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated
{
[super setHighlighted:highlighted animated:animated];
[self.node __setHighlightedFromUIKit:highlighted];
}
- (void)prepareForReuse
{
// Need to clear element before UIKit calls setSelected:NO / setHighlighted:NO on its cells
self.element = nil;
[super prepareForReuse];
}
@end
#pragma mark -
#pragma mark ASTableView
@interface ASTableView () <ASRangeControllerDataSource, ASRangeControllerDelegate, ASDataControllerSource, _ASTableViewCellDelegate, ASCellNodeInteractionDelegate, ASDelegateProxyInterceptor, ASBatchFetchingScrollView>
{
ASTableViewProxy *_proxyDataSource;
ASTableViewProxy *_proxyDelegate;
ASTableLayoutController *_layoutController;
ASRangeController *_rangeController;
ASBatchContext *_batchContext;
// When we update our data controller in response to an interactive move,
// we don't want to tell the table view about the change (it knows!)
BOOL _updatingInResponseToInteractiveMove;
BOOL _inverted;
// The top cell node that was visible before the update.
__weak ASCellNode *_contentOffsetAdjustmentTopVisibleNode;
// The y-offset of the top visible row's origin before the update.
CGFloat _contentOffsetAdjustmentTopVisibleNodeOffset;
CGFloat _leadingScreensForBatching;
BOOL _automaticallyAdjustsContentOffset;
CGPoint _deceleratingVelocity;
CGFloat _nodesConstrainedWidth;
BOOL _queuedNodeHeightUpdate;
BOOL _isDeallocating;
NSHashTable<_ASTableViewCell *> *_cellsForVisibilityUpdates;
// CountedSet because UIKit may display the same element in multiple cells e.g. during animations.
NSCountedSet<ASCollectionElement *> *_visibleElements;
NSHashTable<ASCellNode *> *_cellsForLayoutUpdates;
// See documentation on same property in ASCollectionView
BOOL _hasEverCheckedForBatchFetchingDueToUpdate;
// The section index overlay view, if there is one present.
// This is useful because we need to measure our row nodes against (width - indexView.width).
__weak UIView *_sectionIndexView;
/**
* The change set that we're currently building, if any.
*/
_ASHierarchyChangeSet *_changeSet;
/**
* Counter used to keep track of nested batch updates.
*/
NSInteger _batchUpdateCount;
/**
* Keep a strong reference to node till view is ready to release.
*/
ASTableNode *_keepalive_node;
struct {
unsigned int scrollViewDidScroll:1;
unsigned int scrollViewWillBeginDragging:1;
unsigned int scrollViewDidEndDragging:1;
unsigned int scrollViewWillEndDragging:1;
unsigned int scrollViewDidEndDecelerating:1;
unsigned int tableNodeWillDisplayNodeForRow:1;
unsigned int tableViewWillDisplayNodeForRow:1;
unsigned int tableViewWillDisplayNodeForRowDeprecated:1;
unsigned int tableNodeDidEndDisplayingNodeForRow:1;
unsigned int tableViewDidEndDisplayingNodeForRow:1;
unsigned int tableNodeWillBeginBatchFetch:1;
unsigned int tableViewWillBeginBatchFetch:1;
unsigned int shouldBatchFetchForTableView:1;
unsigned int shouldBatchFetchForTableNode:1;
unsigned int tableViewConstrainedSizeForRow:1;
unsigned int tableNodeConstrainedSizeForRow:1;
unsigned int tableViewWillSelectRow:1;
unsigned int tableNodeWillSelectRow:1;
unsigned int tableViewDidSelectRow:1;
unsigned int tableNodeDidSelectRow:1;
unsigned int tableViewWillDeselectRow:1;
unsigned int tableNodeWillDeselectRow:1;
unsigned int tableViewDidDeselectRow:1;
unsigned int tableNodeDidDeselectRow:1;
unsigned int tableViewShouldHighlightRow:1;
unsigned int tableNodeShouldHighlightRow:1;
unsigned int tableViewDidHighlightRow:1;
unsigned int tableNodeDidHighlightRow:1;
unsigned int tableViewDidUnhighlightRow:1;
unsigned int tableNodeDidUnhighlightRow:1;
unsigned int tableViewShouldShowMenuForRow:1;
unsigned int tableNodeShouldShowMenuForRow:1;
unsigned int tableViewCanPerformActionForRow:1;
unsigned int tableNodeCanPerformActionForRow:1;
unsigned int tableViewPerformActionForRow:1;
unsigned int tableNodePerformActionForRow:1;
} _asyncDelegateFlags;
struct {
unsigned int numberOfSectionsInTableView:1;
unsigned int numberOfSectionsInTableNode:1;
unsigned int tableNodeNumberOfRowsInSection:1;
unsigned int tableViewNumberOfRowsInSection:1;
unsigned int tableViewNodeBlockForRow:1;
unsigned int tableNodeNodeBlockForRow:1;
unsigned int tableViewNodeForRow:1;
unsigned int tableNodeNodeForRow:1;
unsigned int tableViewCanMoveRow:1;
unsigned int tableNodeCanMoveRow:1;
unsigned int tableViewMoveRow:1;
unsigned int tableNodeMoveRow:1;
unsigned int sectionIndexMethods:1; // if both section index methods are implemented
} _asyncDataSourceFlags;
}
@property (nonatomic) ASDataController *dataController;
@property (nonatomic, weak) ASTableNode *tableNode;
@property (nonatomic) BOOL test_enableSuperUpdateCallLogging;
@end
@implementation ASTableView
{
__weak id<ASTableDelegate> _asyncDelegate;
__weak id<ASTableDataSource> _asyncDataSource;
}
// Using _ASDisplayLayer ensures things like -layout are properly forwarded to ASTableNode.
+ (Class)layerClass
{
return [_ASDisplayLayer class];
}
+ (Class)dataControllerClass
{
return [ASDataController class];
}
#pragma mark -
#pragma mark Lifecycle
- (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style
{
return [self _initWithFrame:frame style:style dataControllerClass:nil owningNode:nil eventLog:nil];
}
- (instancetype)_initWithFrame:(CGRect)frame style:(UITableViewStyle)style dataControllerClass:(Class)dataControllerClass owningNode:(ASTableNode *)tableNode eventLog:(ASEventLog *)eventLog
{
if (!(self = [super initWithFrame:frame style:style])) {
return nil;
}
_cellsForVisibilityUpdates = [NSHashTable hashTableWithOptions:NSHashTableObjectPointerPersonality];
_cellsForLayoutUpdates = [NSHashTable hashTableWithOptions:NSHashTableObjectPointerPersonality];
if (!dataControllerClass) {
dataControllerClass = [[self class] dataControllerClass];
}
_layoutController = [[ASTableLayoutController alloc] initWithTableView:self];
_rangeController = [[ASRangeController alloc] init];
_rangeController.layoutController = _layoutController;
_rangeController.dataSource = self;
_rangeController.delegate = self;
_dataController = [[dataControllerClass alloc] initWithDataSource:self node:tableNode eventLog:eventLog];
_dataController.delegate = _rangeController;
_leadingScreensForBatching = 2.0;
_batchContext = [[ASBatchContext alloc] init];
_visibleElements = [[NSCountedSet alloc] init];
_automaticallyAdjustsContentOffset = NO;
_nodesConstrainedWidth = self.bounds.size.width;
_proxyDelegate = [[ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
super.delegate = (id<UITableViewDelegate>)_proxyDelegate;
_proxyDataSource = [[ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
super.dataSource = (id<UITableViewDataSource>)_proxyDataSource;
[self registerClass:_ASTableViewCell.class forCellReuseIdentifier:kCellReuseIdentifier];
// iOS 11 automatically uses estimated heights, so disable those (see PR #485)
if (AS_AT_LEAST_IOS11) {
super.estimatedRowHeight = 0.0;
super.estimatedSectionHeaderHeight = 0.0;
super.estimatedSectionFooterHeight = 0.0;
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
NSLog(@"Warning: AsyncDisplayKit is not designed to be used with Interface Builder. Table properties set in IB will be lost.");
return [self initWithFrame:CGRectZero style:UITableViewStylePlain];
}
- (void)dealloc
{
ASDisplayNodeAssertMainThread();
ASDisplayNodeCAssert(_batchUpdateCount == 0, @"ASTableView deallocated in the middle of a batch update.");
// Sometimes the UIKit classes can call back to their delegate even during deallocation.
_isDeallocating = YES;
if (!ASActivateExperimentalFeature(ASExperimentalCollectionTeardown)) {
[self setAsyncDelegate:nil];
[self setAsyncDataSource:nil];
}
// Data controller & range controller may own a ton of nodes, let's deallocate those off-main
ASPerformBackgroundDeallocation(&_dataController);
ASPerformBackgroundDeallocation(&_rangeController);
}
#pragma mark -
#pragma mark Overrides
- (void)setDataSource:(id<UITableViewDataSource>)dataSource
{
// UIKit can internally generate a call to this method upon changing the asyncDataSource; only assert for non-nil.
ASDisplayNodeAssert(dataSource == nil, @"ASTableView uses asyncDataSource, not UITableView's dataSource property.");
}
- (void)setDelegate:(id<UITableViewDelegate>)delegate
{
// Our UIScrollView superclass sets its delegate to nil on dealloc. Only assert if we get a non-nil value here.
ASDisplayNodeAssert(delegate == nil, @"ASTableView uses asyncDelegate, not UITableView's delegate property.");
}
- (id<ASTableDataSource>)asyncDataSource
{
return _asyncDataSource;
}
- (void)setAsyncDataSource:(id<ASTableDataSource>)asyncDataSource
{
// Changing super.dataSource will trigger a setNeedsLayout, so this must happen on the main thread.
ASDisplayNodeAssertMainThread();
// Note: It's common to check if the value hasn't changed and short-circuit but we aren't doing that here to handle
// the (common) case of nilling the asyncDataSource in the ViewController's dealloc. In this case our _asyncDataSource
// will return as nil (ARC magic) even though the _proxyDataSource still exists. It's really important to hold a strong
// reference to the old dataSource in this case because calls to ASTableViewProxy will start failing and cause crashes.
NS_VALID_UNTIL_END_OF_SCOPE id oldDataSource = self.dataSource;
if (asyncDataSource == nil) {
_asyncDataSource = nil;
_proxyDataSource = _isDeallocating ? nil : [[ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
memset(&_asyncDataSourceFlags, 0, sizeof(_asyncDataSourceFlags));
} else {
_asyncDataSource = asyncDataSource;
_proxyDataSource = [[ASTableViewProxy alloc] initWithTarget:_asyncDataSource interceptor:self];
_asyncDataSourceFlags.numberOfSectionsInTableView = [_asyncDataSource respondsToSelector:@selector(numberOfSectionsInTableView:)];
_asyncDataSourceFlags.numberOfSectionsInTableNode = [_asyncDataSource respondsToSelector:@selector(numberOfSectionsInTableNode:)];
_asyncDataSourceFlags.tableViewNumberOfRowsInSection = [_asyncDataSource respondsToSelector:@selector(tableView:numberOfRowsInSection:)];
_asyncDataSourceFlags.tableNodeNumberOfRowsInSection = [_asyncDataSource respondsToSelector:@selector(tableNode:numberOfRowsInSection:)];
_asyncDataSourceFlags.tableViewNodeForRow = [_asyncDataSource respondsToSelector:@selector(tableView:nodeForRowAtIndexPath:)];
_asyncDataSourceFlags.tableNodeNodeForRow = [_asyncDataSource respondsToSelector:@selector(tableNode:nodeForRowAtIndexPath:)];
_asyncDataSourceFlags.tableViewNodeBlockForRow = [_asyncDataSource respondsToSelector:@selector(tableView:nodeBlockForRowAtIndexPath:)];
_asyncDataSourceFlags.tableNodeNodeBlockForRow = [_asyncDataSource respondsToSelector:@selector(tableNode:nodeBlockForRowAtIndexPath:)];
_asyncDataSourceFlags.tableViewCanMoveRow = [_asyncDataSource respondsToSelector:@selector(tableView:canMoveRowAtIndexPath:)];
_asyncDataSourceFlags.tableViewMoveRow = [_asyncDataSource respondsToSelector:@selector(tableView:moveRowAtIndexPath:toIndexPath:)];
_asyncDataSourceFlags.sectionIndexMethods = [_asyncDataSource respondsToSelector:@selector(sectionIndexTitlesForTableView:)] && [_asyncDataSource respondsToSelector:@selector(tableView:sectionForSectionIndexTitle:atIndex:)];
ASDisplayNodeAssert(_asyncDataSourceFlags.tableViewNodeBlockForRow
|| _asyncDataSourceFlags.tableViewNodeForRow
|| _asyncDataSourceFlags.tableNodeNodeBlockForRow
|| _asyncDataSourceFlags.tableNodeNodeForRow, @"Data source must implement tableNode:nodeBlockForRowAtIndexPath: or tableNode:nodeForRowAtIndexPath:");
ASDisplayNodeAssert(_asyncDataSourceFlags.tableNodeNumberOfRowsInSection || _asyncDataSourceFlags.tableViewNumberOfRowsInSection, @"Data source must implement tableNode:numberOfRowsInSection:");
}
_dataController.validationErrorSource = asyncDataSource;
super.dataSource = (id<UITableViewDataSource>)_proxyDataSource;
}
- (id<ASTableDelegate>)asyncDelegate
{
return _asyncDelegate;
}
- (void)setAsyncDelegate:(id<ASTableDelegate>)asyncDelegate
{
// Changing super.delegate will trigger a setNeedsLayout, so this must happen on the main thread.
ASDisplayNodeAssertMainThread();
// Note: It's common to check if the value hasn't changed and short-circuit but we aren't doing that here to handle
// the (common) case of nilling the asyncDelegate in the ViewController's dealloc. In this case our _asyncDelegate
// will return as nil (ARC magic) even though the _proxyDataSource still exists. It's really important to hold a strong
// reference to the old delegate in this case because calls to ASTableViewProxy will start failing and cause crashes.
NS_VALID_UNTIL_END_OF_SCOPE id oldDelegate = super.delegate;
if (asyncDelegate == nil) {
_asyncDelegate = nil;
_proxyDelegate = _isDeallocating ? nil : [[ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
memset(&_asyncDelegateFlags, 0, sizeof(_asyncDelegateFlags));
} else {
_asyncDelegate = asyncDelegate;
_proxyDelegate = [[ASTableViewProxy alloc] initWithTarget:_asyncDelegate interceptor:self];
_asyncDelegateFlags.scrollViewDidScroll = [_asyncDelegate respondsToSelector:@selector(scrollViewDidScroll:)];
_asyncDelegateFlags.tableViewWillDisplayNodeForRow = [_asyncDelegate respondsToSelector:@selector(tableView:willDisplayNode:forRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeWillDisplayNodeForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:willDisplayRowWithNode:)];
if (_asyncDelegateFlags.tableViewWillDisplayNodeForRow == NO) {
_asyncDelegateFlags.tableViewWillDisplayNodeForRowDeprecated = [_asyncDelegate respondsToSelector:@selector(tableView:willDisplayNodeForRowAtIndexPath:)];
}
_asyncDelegateFlags.tableViewDidEndDisplayingNodeForRow = [_asyncDelegate respondsToSelector:@selector(tableView:didEndDisplayingNode:forRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidEndDisplayingNodeForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didEndDisplayingRowWithNode:)];
_asyncDelegateFlags.scrollViewWillEndDragging = [_asyncDelegate respondsToSelector:@selector(scrollViewWillEndDragging:withVelocity:targetContentOffset:)];
_asyncDelegateFlags.scrollViewDidEndDecelerating = [_asyncDelegate respondsToSelector:@selector(scrollViewDidEndDecelerating:)];
_asyncDelegateFlags.tableViewWillBeginBatchFetch = [_asyncDelegate respondsToSelector:@selector(tableView:willBeginBatchFetchWithContext:)];
_asyncDelegateFlags.tableNodeWillBeginBatchFetch = [_asyncDelegate respondsToSelector:@selector(tableNode:willBeginBatchFetchWithContext:)];
_asyncDelegateFlags.shouldBatchFetchForTableView = [_asyncDelegate respondsToSelector:@selector(shouldBatchFetchForTableView:)];
_asyncDelegateFlags.shouldBatchFetchForTableNode = [_asyncDelegate respondsToSelector:@selector(shouldBatchFetchForTableNode:)];
_asyncDelegateFlags.scrollViewWillBeginDragging = [_asyncDelegate respondsToSelector:@selector(scrollViewWillBeginDragging:)];
_asyncDelegateFlags.scrollViewDidEndDragging = [_asyncDelegate respondsToSelector:@selector(scrollViewDidEndDragging:willDecelerate:)];
_asyncDelegateFlags.tableViewConstrainedSizeForRow = [_asyncDelegate respondsToSelector:@selector(tableView:constrainedSizeForRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeConstrainedSizeForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:constrainedSizeForRowAtIndexPath:)];
_asyncDelegateFlags.tableViewWillSelectRow = [_asyncDelegate respondsToSelector:@selector(tableView:willSelectRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeWillSelectRow = [_asyncDelegate respondsToSelector:@selector(tableNode:willSelectRowAtIndexPath:)];
_asyncDelegateFlags.tableViewDidSelectRow = [_asyncDelegate respondsToSelector:@selector(tableView:didSelectRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidSelectRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didSelectRowAtIndexPath:)];
_asyncDelegateFlags.tableViewWillDeselectRow = [_asyncDelegate respondsToSelector:@selector(tableView:willDeselectRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeWillDeselectRow = [_asyncDelegate respondsToSelector:@selector(tableNode:willDeselectRowAtIndexPath:)];
_asyncDelegateFlags.tableViewDidDeselectRow = [_asyncDelegate respondsToSelector:@selector(tableView:didDeselectRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidDeselectRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didDeselectRowAtIndexPath:)];
_asyncDelegateFlags.tableViewShouldHighlightRow = [_asyncDelegate respondsToSelector:@selector(tableView:shouldHighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeShouldHighlightRow = [_asyncDelegate respondsToSelector:@selector(tableNode:shouldHighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableViewDidHighlightRow = [_asyncDelegate respondsToSelector:@selector(tableView:didHighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidHighlightRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didHighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableViewDidUnhighlightRow = [_asyncDelegate respondsToSelector:@selector(tableView:didUnhighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidUnhighlightRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didUnhighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableViewShouldShowMenuForRow = [_asyncDelegate respondsToSelector:@selector(tableView:shouldShowMenuForRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeShouldShowMenuForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:shouldShowMenuForRowAtIndexPath:)];
_asyncDelegateFlags.tableViewCanPerformActionForRow = [_asyncDelegate respondsToSelector:@selector(tableView:canPerformAction:forRowAtIndexPath:withSender:)];
_asyncDelegateFlags.tableNodeCanPerformActionForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:canPerformAction:forRowAtIndexPath:withSender:)];
_asyncDelegateFlags.tableViewPerformActionForRow = [_asyncDelegate respondsToSelector:@selector(tableView:performAction:forRowAtIndexPath:withSender:)];
_asyncDelegateFlags.tableNodePerformActionForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:performAction:forRowAtIndexPath:withSender:)];
}
super.delegate = (id<UITableViewDelegate>)_proxyDelegate;
}
- (void)proxyTargetHasDeallocated:(ASDelegateProxy *)proxy
{
if (proxy == _proxyDelegate) {
[self setAsyncDelegate:nil];
} else if (proxy == _proxyDataSource) {
[self setAsyncDataSource:nil];
}
}
- (void)reloadDataWithCompletion:(void (^)())completion
{
ASDisplayNodeAssertMainThread();
if (! _dataController.initialReloadDataHasBeenCalled) {
// If this is the first reload, forward to super immediately to prevent it from triggering more "initial" loads while our data controller is working.
[super reloadData];
}
void (^batchUpdatesCompletion)(BOOL);
if (completion) {
batchUpdatesCompletion = ^(BOOL) {
completion();
};
}
[self beginUpdates];
[_changeSet reloadData];
[self endUpdatesWithCompletion:batchUpdatesCompletion];
}
- (void)reloadData
{
[self reloadDataWithCompletion:nil];
}
- (void)scrollToRowAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated
{
if ([self validateIndexPath:indexPath]) {
[super scrollToRowAtIndexPath:indexPath atScrollPosition:scrollPosition animated:animated];
}
}
- (void)relayoutItems
{
[_dataController relayoutAllNodesWithInvalidationBlock:nil];
}
- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeType:(ASLayoutRangeType)rangeType
{
[_rangeController setTuningParameters:tuningParameters forRangeMode:ASLayoutRangeModeFull rangeType:rangeType];
}
- (ASRangeTuningParameters)tuningParametersForRangeType:(ASLayoutRangeType)rangeType
{
return [_rangeController tuningParametersForRangeMode:ASLayoutRangeModeFull rangeType:rangeType];
}
- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeMode:(ASLayoutRangeMode)rangeMode rangeType:(ASLayoutRangeType)rangeType
{
[_rangeController setTuningParameters:tuningParameters forRangeMode:rangeMode rangeType:rangeType];
}
- (ASRangeTuningParameters)tuningParametersForRangeMode:(ASLayoutRangeMode)rangeMode rangeType:(ASLayoutRangeType)rangeType
{
return [_rangeController tuningParametersForRangeMode:rangeMode rangeType:rangeType];
}
- (ASElementMap *)elementMapForRangeController:(ASRangeController *)rangeController
{
return _dataController.visibleMap;
}
- (ASCellNode *)nodeForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [_dataController.visibleMap elementForItemAtIndexPath:indexPath].node;
}
- (NSIndexPath *)convertIndexPathFromTableNode:(NSIndexPath *)indexPath waitingIfNeeded:(BOOL)wait
{
NSIndexPath *viewIndexPath = [_dataController.visibleMap convertIndexPath:indexPath fromMap:_dataController.pendingMap];
if (viewIndexPath == nil && wait) {
[self waitUntilAllUpdatesAreCommitted];
return [self convertIndexPathFromTableNode:indexPath waitingIfNeeded:NO];
}
return viewIndexPath;
}
- (NSIndexPath *)convertIndexPathToTableNode:(NSIndexPath *)indexPath
{
if ([self validateIndexPath:indexPath] == nil) {
return nil;
}
return [_dataController.pendingMap convertIndexPath:indexPath fromMap:_dataController.visibleMap];
}
- (NSArray<NSIndexPath *> *)convertIndexPathsToTableNode:(NSArray<NSIndexPath *> *)indexPaths
{
if (indexPaths == nil) {
return nil;
}
NSMutableArray<NSIndexPath *> *indexPathsArray = [NSMutableArray new];
for (NSIndexPath *indexPathInView in indexPaths) {
NSIndexPath *indexPath = [self convertIndexPathToTableNode:indexPathInView];
if (indexPath != nil) {
[indexPathsArray addObject:indexPath];
}
}
return indexPathsArray;
}
- (NSIndexPath *)indexPathForNode:(ASCellNode *)cellNode
{
return [self indexPathForNode:cellNode waitingIfNeeded:NO];
}
/**
* Asserts that the index path is a valid view-index-path, and returns it if so, nil otherwise.
*/
- (nullable NSIndexPath *)validateIndexPath:(nullable NSIndexPath *)indexPath
{
if (indexPath == nil) {
return nil;
}
NSInteger section = indexPath.section;
if (section >= self.numberOfSections) {
ASDisplayNodeFailAssert(@"Table view index path has invalid section %lu, section count = %lu", (unsigned long)section, (unsigned long)self.numberOfSections);
return nil;
}
NSInteger item = indexPath.item;
// item == NSNotFound means e.g. "scroll to this section" and is acceptable
if (item != NSNotFound && item >= [self numberOfRowsInSection:section]) {
ASDisplayNodeFailAssert(@"Table view index path has invalid item %lu in section %lu, item count = %lu", (unsigned long)indexPath.item, (unsigned long)section, (unsigned long)[self numberOfRowsInSection:section]);
return nil;
}
return indexPath;
}
- (nullable NSIndexPath *)indexPathForNode:(ASCellNode *)cellNode waitingIfNeeded:(BOOL)wait
{
if (cellNode == nil) {
return nil;
}
NSIndexPath *indexPath = [_dataController.visibleMap indexPathForElement:cellNode.collectionElement];
indexPath = [self validateIndexPath:indexPath];
if (indexPath == nil && wait) {
[self waitUntilAllUpdatesAreCommitted];
return [self indexPathForNode:cellNode waitingIfNeeded:NO];
}
return indexPath;
}
- (NSArray<ASCellNode *> *)visibleNodes
{
let elements = [self visibleElementsForRangeController:_rangeController];
return ASArrayByFlatMapping(elements, ASCollectionElement *e, e.node);
}
- (void)beginUpdates
{
ASDisplayNodeAssertMainThread();
// _changeSet must be available during batch update
ASDisplayNodeAssertTrue((_batchUpdateCount > 0) == (_changeSet != nil));
if (_batchUpdateCount == 0) {
_changeSet = [[_ASHierarchyChangeSet alloc] initWithOldData:[_dataController itemCountsFromDataSource]];
}
_batchUpdateCount++;
}
- (void)endUpdates
{
[self endUpdatesWithCompletion:nil];
}
- (void)endUpdatesWithCompletion:(void (^)(BOOL completed))completion
{
// We capture the current state of whether animations are enabled if they don't provide us with one.
[self endUpdatesAnimated:[UIView areAnimationsEnabled] completion:completion];
}
- (void)endUpdatesAnimated:(BOOL)animated completion:(void (^)(BOOL completed))completion
{
ASDisplayNodeAssertMainThread();
ASDisplayNodeAssertNotNil(_changeSet, @"_changeSet must be available when batch update ends");
_batchUpdateCount--;
// Prevent calling endUpdatesAnimated:completion: in an unbalanced way
NSAssert(_batchUpdateCount >= 0, @"endUpdatesAnimated:completion: called without having a balanced beginUpdates call");
[_changeSet addCompletionHandler:completion];
if (_batchUpdateCount == 0) {
_ASHierarchyChangeSet *changeSet = _changeSet;
// Nil out _changeSet before forwarding to _dataController to allow the change set to cause subsequent batch updates on the same run loop
_changeSet = nil;
changeSet.animated = animated;
[_dataController updateWithChangeSet:changeSet];
}
}
- (BOOL)isProcessingUpdates
{
return [_dataController isProcessingUpdates];
}
- (void)onDidFinishProcessingUpdates:(void (^)())completion
{
[_dataController onDidFinishProcessingUpdates:completion];
}
- (void)waitUntilAllUpdatesAreCommitted
{
ASDisplayNodeAssertMainThread();
if (_batchUpdateCount > 0) {
// This assertion will be enabled soon.
// ASDisplayNodeFailAssert(@"Should not call %@ during batch update", NSStringFromSelector(_cmd));
return;
}
[_dataController waitUntilAllUpdatesAreProcessed];
}
- (void)layoutSubviews
{
// Remeasure all rows if our row width has changed.
UIEdgeInsets contentInset = self.contentInset;
CGFloat constrainedWidth = self.bounds.size.width - [self sectionIndexWidth] - contentInset.left - contentInset.right;
if (constrainedWidth > 0 && _nodesConstrainedWidth != constrainedWidth) {
_nodesConstrainedWidth = constrainedWidth;
[_cellsForLayoutUpdates removeAllObjects];
[self beginUpdates];
[_dataController relayoutAllNodesWithInvalidationBlock:nil];
[self endUpdatesAnimated:(ASDisplayNodeLayerHasAnimations(self.layer) == NO) completion:nil];
} else {
if (_cellsForLayoutUpdates.count > 0) {
NSArray<ASCellNode *> *nodes = [_cellsForLayoutUpdates allObjects];
[_cellsForLayoutUpdates removeAllObjects];
let nodesSizeChanged = [[NSMutableArray<ASCellNode *> alloc] init];
[_dataController relayoutNodes:nodes nodesSizeChanged:nodesSizeChanged];
if (nodesSizeChanged.count > 0) {
[self requeryNodeHeights];
}
}
}
// To ensure _nodesConstrainedWidth is up-to-date for every usage, this call to super must be done last
[super layoutSubviews];
[_rangeController updateIfNeeded];
}
#pragma mark -
#pragma mark Editing
- (void)insertSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (sections.count == 0) { return; }
[self beginUpdates];
[_changeSet insertSections:sections animationOptions:animation];
[self endUpdates];
}
- (void)deleteSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (sections.count == 0) { return; }
[self beginUpdates];
[_changeSet deleteSections:sections animationOptions:animation];
[self endUpdates];
}
- (void)reloadSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (sections.count == 0) { return; }
[self beginUpdates];
[_changeSet reloadSections:sections animationOptions:animation];
[self endUpdates];
}
- (void)moveSection:(NSInteger)section toSection:(NSInteger)newSection
{
ASDisplayNodeAssertMainThread();
[self beginUpdates];
[_changeSet moveSection:section toSection:newSection animationOptions:UITableViewRowAnimationNone];
[self endUpdates];
}
- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (indexPaths.count == 0) { return; }
[self beginUpdates];
[_changeSet insertItems:indexPaths animationOptions:animation];
[self endUpdates];
}
- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (indexPaths.count == 0) { return; }
[self beginUpdates];
[_changeSet deleteItems:indexPaths animationOptions:animation];
[self endUpdates];
}
- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (indexPaths.count == 0) { return; }
[self beginUpdates];
[_changeSet reloadItems:indexPaths animationOptions:animation];
[self endUpdates];
}
- (void)moveRowAtIndexPath:(NSIndexPath *)indexPath toIndexPath:(NSIndexPath *)newIndexPath
{
ASDisplayNodeAssertMainThread();
[self beginUpdates];
[_changeSet moveItemAtIndexPath:indexPath toIndexPath:newIndexPath animationOptions:UITableViewRowAnimationNone];
[self endUpdates];
}
#pragma mark -
#pragma mark adjust content offset
- (void)beginAdjustingContentOffset
{
NSIndexPath *firstVisibleIndexPath = [self.indexPathsForVisibleRows sortedArrayUsingSelector:@selector(compare:)].firstObject;
if (firstVisibleIndexPath) {
ASCellNode *node = [self nodeForRowAtIndexPath:firstVisibleIndexPath];
if (node) {
_contentOffsetAdjustmentTopVisibleNode = node;
_contentOffsetAdjustmentTopVisibleNodeOffset = [self rectForRowAtIndexPath:firstVisibleIndexPath].origin.y - self.bounds.origin.y;
}
}
}
- (void)endAdjustingContentOffsetAnimated:(BOOL)animated
{
// We can't do this for animated updates.
if (animated) {
return;
}
// We can't do this if we didn't have a top visible row before.
if (_contentOffsetAdjustmentTopVisibleNode == nil) {
return;
}
NSIndexPath *newIndexPathForTopVisibleRow = [self indexPathForNode:_contentOffsetAdjustmentTopVisibleNode];
// We can't do this if our top visible row was deleted
if (newIndexPathForTopVisibleRow == nil) {
return;
}
CGFloat newRowOriginYInSelf = [self rectForRowAtIndexPath:newIndexPathForTopVisibleRow].origin.y - self.bounds.origin.y;
CGPoint newContentOffset = self.contentOffset;
newContentOffset.y += (newRowOriginYInSelf - _contentOffsetAdjustmentTopVisibleNodeOffset);
self.contentOffset = newContentOffset;
_contentOffsetAdjustmentTopVisibleNode = nil;
}
#pragma mark - Intercepted selectors
- (void)setTableHeaderView:(UIView *)tableHeaderView
{
// Typically the view will be nil before setting it, but reset state if it is being re-hosted.
[self.tableHeaderView.asyncdisplaykit_node exitHierarchyState:ASHierarchyStateRangeManaged];
[super setTableHeaderView:tableHeaderView];
[self.tableHeaderView.asyncdisplaykit_node enterHierarchyState:ASHierarchyStateRangeManaged];
}
- (void)setTableFooterView:(UIView *)tableFooterView
{
// Typically the view will be nil before setting it, but reset state if it is being re-hosted.
[self.tableFooterView.asyncdisplaykit_node exitHierarchyState:ASHierarchyStateRangeManaged];
[super setTableFooterView:tableFooterView];
[self.tableFooterView.asyncdisplaykit_node enterHierarchyState:ASHierarchyStateRangeManaged];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
_ASTableViewCell *cell = [self dequeueReusableCellWithIdentifier:kCellReuseIdentifier forIndexPath:indexPath];
cell.delegate = self;
ASCollectionElement *element = [_dataController.visibleMap elementForItemAtIndexPath:indexPath];
cell.element = element;
ASCellNode *node = element.node;
if (node) {
[_rangeController configureContentView:cell.contentView forCellNode:node];
}
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
CGFloat height = 0.0;
ASCollectionElement *element = [_dataController.visibleMap elementForItemAtIndexPath:indexPath];
if (element != nil) {
ASCellNode *node = element.node;
ASDisplayNodeAssertNotNil(node, @"Node must not be nil!");
height = [node layoutThatFits:element.constrainedSize].size.height;
}
#if TARGET_OS_IOS
/**
* Weirdly enough, Apple expects the return value here to _include_ the height
* of the separator, if there is one! So if our node wants to be 43.5, we need
* to return 44. UITableView will make a cell of height 44 with a content view
* of height 43.5.
*/
if (tableView.separatorStyle != UITableViewCellSeparatorStyleNone) {
height += 1.0 / ASScreenScale();
}
#endif
return height;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return _dataController.visibleMap.numberOfSections;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [_dataController.visibleMap numberOfItemsInSection:section];
}
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
if (_asyncDataSourceFlags.tableViewCanMoveRow) {
return [_asyncDataSource tableView:self canMoveRowAtIndexPath:indexPath];
} else {
return NO;
}
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
if (_asyncDataSourceFlags.tableViewMoveRow) {
[_asyncDataSource tableView:self moveRowAtIndexPath:sourceIndexPath toIndexPath:destinationIndexPath];
}
// Move node after informing data source in case they call nodeAtIndexPath:
// Get up to date
[self waitUntilAllUpdatesAreCommitted];
// Set our flag to suppress informing super about the change.
_updatingInResponseToInteractiveMove = YES;
// Submit the move
[self moveRowAtIndexPath:sourceIndexPath toIndexPath:destinationIndexPath];
// Wait for it to finish – should be fast!
[self waitUntilAllUpdatesAreCommitted];
// Clear the flag
_updatingInResponseToInteractiveMove = NO;
}
- (void)tableView:(UITableView *)tableView willDisplayCell:(_ASTableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
ASCollectionElement *element = cell.element;
if (element) {
ASDisplayNodeAssertTrue([_dataController.visibleMap elementForItemAtIndexPath:indexPath] == element);
[_visibleElements addObject:element];
} else {
ASDisplayNodeAssert(NO, @"Unexpected nil element for willDisplayCell: %@, %@, %@", cell, self, indexPath);
return;
}
ASCellNode *cellNode = element.node;
cellNode.scrollView = tableView;
ASDisplayNodeAssertNotNil(cellNode, @"Expected node associated with cell that will be displayed not to be nil. indexPath: %@", indexPath);
if (_asyncDelegateFlags.tableNodeWillDisplayNodeForRow) {
GET_TABLENODE_OR_RETURN(tableNode, (void)0);
[_asyncDelegate tableNode:tableNode willDisplayRowWithNode:cellNode];
} else if (_asyncDelegateFlags.tableViewWillDisplayNodeForRow) {
#pragma clang diagnostic push