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Still support -calculateLayoutThatFits: (and manual layout), for backward compatibility.

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This commit is contained in:
Huy Nguyen
2015-06-28 20:22:40 +07:00
parent 95e787b226
commit dd29a890df
13 changed files with 121 additions and 68 deletions
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29
AsyncDisplayKit/ASDisplayNode.mm
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@@ -76,6 +76,12 @@ void ASDisplayNodePerformBlockOnMainThread(void (^block)())
ASDisplayNodeAssert(!ASDisplayNodeSubclassOverridesSelector(self, @selector(measure:)), @"Subclass %@ must not override measure method", NSStringFromClass(self));
ASDisplayNodeAssert(!ASDisplayNodeSubclassOverridesSelector(self, @selector(recursivelyClearContents)), @"Subclass %@ must not override recursivelyClearContents method", NSStringFromClass(self));
ASDisplayNodeAssert(!ASDisplayNodeSubclassOverridesSelector(self, @selector(recursivelyClearFetchedData)), @"Subclass %@ must not override recursivelyClearFetchedData method", NSStringFromClass(self));
// At most one of the three layout methods is overridden
ASDisplayNodeAssert((ASDisplayNodeSubclassOverridesSelector(self, @selector(calculateSizeThatFits:)) ? 1 : 0)
+ (ASDisplayNodeSubclassOverridesSelector(self, @selector(layoutSpecThatFits:)) ? 1 : 0)
+ (ASDisplayNodeSubclassOverridesSelector(self, @selector(calculateLayoutThatFits:)) ? 1 : 0) <= 1,
@"Subclass %@ must override at most one of the three layout methods: calculateLayoutThatFits, layoutSpecThatFits or calculateSizeThatFits", NSStringFromClass(self));
}
+ (BOOL)layerBackedNodesEnabled
@@ -122,6 +128,9 @@ void ASDisplayNodePerformBlockOnMainThread(void (^block)())
if (ASDisplayNodeSubclassOverridesSelector([self class], @selector(touchesEnded:withEvent:))) {
overrides |= ASDisplayNodeMethodOverrideTouchesEnded;
}
if (ASDisplayNodeSubclassOverridesSelector([self class], @selector(calculateSizeThatFits:))) {
overrides |= ASDisplayNodeMethodOverrideCalculateSizeThatFits;
}
_methodOverrides = overrides;
_flexBasis = ASRelativeDimensionUnconstrained;
@@ -1271,7 +1280,25 @@ static NSInteger incrementIfFound(NSInteger i) {
- (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
{
ASDisplayNodeAssertThreadAffinity(self);
return [ASLayout newWithLayoutableObject:self size:constrainedSize.min];
if (_methodOverrides & ASDisplayNodeMethodOverrideCalculateSizeThatFits) {
CGSize size = [self calculateSizeThatFits:constrainedSize.max];
return [ASLayout newWithLayoutableObject:self size:ASSizeRangeClamp(constrainedSize, size)];
} else {
id<ASLayoutable> layoutSpec = [self layoutSpecThatFits:constrainedSize];
return [layoutSpec calculateLayoutThatFits:constrainedSize];
}
}
- (CGSize)calculateSizeThatFits:(CGSize)constrainedSize
{
ASDisplayNodeAssertThreadAffinity(self);
return CGSizeZero;
}
- (id<ASLayoutable>)layoutSpecThatFits:(ASSizeRange)constrainedSize
{
ASDisplayNodeAssertThreadAffinity(self);
return nil;
}
- (ASLayout *)calculatedLayout