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Add baseline support to ASStackLayoutSpec

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This commit is contained in:
ricky cancro
2015-08-12 16:55:12 -07:00
committed by rcancro
parent 80bbf79046
commit f289b3345a
8 changed files with 56 additions and 2 deletions
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27
AsyncDisplayKit/Private/ASStackPositionedLayout.mm
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@@ -15,9 +15,21 @@
#import "ASStackLayoutSpecUtilities.h"
#import "ASLayoutable.h"
static CGFloat baselineForItem(const ASStackLayoutSpecStyle &style,
const ASStackUnpositionedItem &item) {
const ASStackLayoutAlignItems alignItems = alignment(item.child.alignSelf, style.alignItems);
if (alignItems == ASStackLayoutAlignItemsBaselineFirst) {
return item.child.ascender;
} else if (alignItems == ASStackLayoutAlignItemsBaselineLast) {
return item.layout.size.height + item.child.descender;
}
return 0;
}
static CGFloat crossOffset(const ASStackLayoutSpecStyle &style,
const ASStackUnpositionedItem &l,
const CGFloat crossSize)
const CGFloat crossSize,
const CGFloat maxBaseline)
{
switch (alignment(l.child.alignSelf, style.alignItems)) {
case ASStackLayoutAlignItemsEnd:
@@ -27,9 +39,14 @@ static CGFloat crossOffset(const ASStackLayoutSpecStyle &style,
case ASStackLayoutAlignItemsStart:
case ASStackLayoutAlignItemsStretch:
return 0;
case ASStackLayoutAlignItemsBaselineFirst:
return maxBaseline - l.child.ascender;
case ASStackLayoutAlignItemsBaselineLast:
return maxBaseline - baselineForItem(style, l);
}
}
static ASStackPositionedLayout stackedLayout(const ASStackLayoutSpecStyle &style,
const CGFloat offset,
const ASStackUnpositionedLayout &unpositionedLayout,
@@ -44,6 +61,12 @@ static ASStackPositionedLayout stackedLayout(const ASStackLayoutSpecStyle &style
const auto minCrossSize = crossDimension(style.direction, constrainedSize.min);
const auto maxCrossSize = crossDimension(style.direction, constrainedSize.max);
const CGFloat crossSize = MIN(MAX(minCrossSize, largestChildCrossSize), maxCrossSize);
// Find the maximum height for the baseline
const auto baselineIt = std::max_element(unpositionedLayout.items.begin(), unpositionedLayout.items.end(), [&](const ASStackUnpositionedItem &a, const ASStackUnpositionedItem &b){
return baselineForItem(style, a) < baselineForItem(style, b);
});
const CGFloat maxBaseLine = baselineIt == unpositionedLayout.items.end() ? 0 : baselineForItem(style, *baselineIt);
CGPoint p = directionPoint(style.direction, offset, 0);
BOOL first = YES;
@@ -53,7 +76,7 @@ static ASStackPositionedLayout stackedLayout(const ASStackLayoutSpecStyle &style
p = p + directionPoint(style.direction, style.spacing, 0);
}
first = NO;
l.layout.position = p + directionPoint(style.direction, 0, crossOffset(style, l, crossSize));
l.layout.position = p + directionPoint(style.direction, 0, crossOffset(style, l, crossSize, maxBaseLine));
p = p + directionPoint(style.direction, stackDimension(style.direction, l.layout.size) + l.child.spacingAfter, 0);
return l.layout;
});