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Implement simple, in-order add/remove subnode support when changing layout specs

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This commit is contained in:
Levi McCallum
2016-02-01 17:49:03 -08:00
parent bd1de07c77
commit d168ec78ce
3 changed files with 145 additions and 18 deletions
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81
AsyncDisplayKit/ASDisplayNode.mm
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@@ -30,6 +30,36 @@
NSInteger const ASDefaultDrawingPriority = ASDefaultTransactionPriority;
@interface _ASDisplayNodePosition : NSObject
@property (nonatomic, assign) NSUInteger index;
@property (nonatomic, strong) ASDisplayNode *node;
+ (instancetype)positionWithNode:(ASDisplayNode *)node atIndex:(NSUInteger)index;
- (instancetype)initWithNode:(ASDisplayNode *)node atIndex:(NSUInteger)index;
@end
@implementation _ASDisplayNodePosition
+ (instancetype)positionWithNode:(ASDisplayNode *)node atIndex:(NSUInteger)index
{
return [[self alloc] initWithNode:node atIndex:index];
}
- (instancetype)initWithNode:(ASDisplayNode *)node atIndex:(NSUInteger)index
{
self = [super init];
if (self) {
_node = node;
_index = index;
}
return self;
}
@end
@interface ASDisplayNode () <UIGestureRecognizerDelegate>
/**
@@ -609,18 +639,20 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
// - the constrained size range is different
if (!_flags.isMeasured || !ASSizeRangeEqualToSizeRange(constrainedSize, _constrainedSize)) {
ASLayout *newLayout = [self calculateLayoutThatFits:constrainedSize];
if (_layout) {
NSIndexSet *insertions, *deletions;
[_layout.sublayouts asdk_diffWithArray:newLayout.sublayouts insertions:&insertions deletions:&deletions];
_insertedSubnodes = [self _filterLayouts:newLayout.sublayouts withIndexes:insertions];
_deletedSubnodes = [self _filterLayouts:newLayout.sublayouts withIndexes:deletions];
[_layout.sublayouts asdk_diffWithArray:newLayout.sublayouts insertions:&insertions deletions:&deletions compareBlock:^BOOL(ASLayout *lhs, ASLayout *rhs) {
return ASObjectIsEqual(lhs.layoutableObject, rhs.layoutableObject);
}];
_insertedSubnodes = [self _filterSublayouts:newLayout.sublayouts withIndexes:insertions];
_deletedSubnodes = [self _filterSublayouts:_layout.sublayouts withIndexes:deletions];
} else {
NSIndexSet *indexes = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, [newLayout.sublayouts count])];
_insertedSubnodes = [self _filterLayouts:newLayout.sublayouts withIndexes:indexes];
_insertedSubnodes = [self _filterSublayouts:newLayout.sublayouts withIndexes:indexes];
_deletedSubnodes = @[];
}
_layout = newLayout;
_constrainedSize = constrainedSize;
_flags.isMeasured = YES;
@@ -641,13 +673,13 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
return _layout;
}
- (NSArray<ASDisplayNode *> *)_filterLayouts:(NSArray<ASLayout *> *)layouts withIndexes:(NSIndexSet *)indexes
- (NSArray<_ASDisplayNodePosition *> *)_filterSublayouts:(NSArray<ASLayout *> *)layouts withIndexes:(NSIndexSet *)indexes
{
NSMutableArray<ASDisplayNode *> *result = [NSMutableArray array];
NSMutableArray<_ASDisplayNodePosition *> *result = [NSMutableArray array];
[indexes enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL * _Nonnull stop) {
ASDisplayNode *node = (ASDisplayNode *)layouts[idx].layoutableObject;
ASDisplayNodeAssertNotNil(node, @"A flattened layout must consist exclusively of node sublayouts");
[result addObject:node];
[result addObject:[_ASDisplayNodePosition positionWithNode:node atIndex:idx]];
}];
return result;
}
@@ -2051,11 +2083,38 @@ static BOOL ShouldUseNewRenderingRange = YES;
[subnode setFrame:subnodeFrame];
}
for (ASDisplayNode *node in _insertedSubnodes) {
[self addSubnode:node];
if ([[self class] usesImplicitHierarchyManagement]) {
if (!_managedSubnodes) {
_managedSubnodes = [NSMutableArray array];
}
for (_ASDisplayNodePosition *position in _deletedSubnodes) {
[self _implicitlyRemoveSubnode:position.node atIndex:position.index];
}
for (_ASDisplayNodePosition *position in _insertedSubnodes) {
[self _implicitlyInsertSubnode:position.node atIndex:position.index];
}
}
}
- (void)_implicitlyInsertSubnode:(ASDisplayNode *)node atIndex:(NSUInteger)idx
{
ASDisplayNodeAssert(idx <= [_managedSubnodes count], @"index needs to be in range of the current managed subnodes");
if (idx == [_managedSubnodes count]) {
[_managedSubnodes addObject:node];
} else {
[_managedSubnodes insertObject:node atIndex:idx];
}
[self addSubnode:node];
}
- (void)_implicitlyRemoveSubnode:(ASDisplayNode *)node atIndex:(NSUInteger)idx
{
[_managedSubnodes removeObjectAtIndex:idx];
[node removeFromSupernode];
}
- (void)displayWillStart
{
// in case current node takes longer to display than it's subnodes, treat it as a dependent node