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Dont constrain absolute children to zero sized parents

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Summary: Absolute children should not be constraint to the size of their parent if the parent does not have a size as this was causes the layout of the child to be skipped.

Reviewed By: gkassabli

Differential Revision: D4453612

fbshipit-source-id: e8269521560d2f42b2d6f0f0ff264a1605a57d79
This commit is contained in:
Emil Sjolander
2017-01-24 17:04:54 -08:00
committed by Facebook Github Bot
parent d391323129
commit a2a84532ff
2 changed files with 25 additions and 5 deletions
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21
tests/YGMeasureTest.cpp
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@@ -47,6 +47,27 @@ TEST(YogaTest, dont_measure_single_grow_shrink_child) {
YGNodeFreeRecursive(root);
}
TEST(YogaTest, measure_absolute_child_with_no_constraints) {
const YGNodeRef root = YGNodeNew();
const YGNodeRef root_child0 = YGNodeNew();
YGNodeInsertChild(root, root_child0, 0);
int measureCount = 0;
const YGNodeRef root_child0_child0 = YGNodeNew();
YGNodeStyleSetPositionType(root_child0_child0, YGPositionTypeAbsolute);
YGNodeSetContext(root_child0_child0, &measureCount);
YGNodeSetMeasureFunc(root_child0_child0, _measure);
YGNodeInsertChild(root_child0, root_child0_child0, 0);
YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionLTR);
ASSERT_EQ(1, measureCount);
YGNodeFreeRecursive(root);
}
#if GTEST_HAS_DEATH_TEST
TEST(YogaTest, cannot_add_child_to_node_with_measure_func) {
const YGNodeRef root = YGNodeNew();

9
yoga/Yoga.c
View File

@@ -1431,11 +1431,10 @@ static void YGNodeAbsoluteLayoutChild(const YGNodeRef node,
childHeightMeasureMode =
YGFloatIsUndefined(childHeight) ? YGMeasureModeUndefined : YGMeasureModeExactly;
// According to the spec, if the main size is not definite and the
// child's inline axis is parallel to the main axis (i.e. it's
// horizontal), the child should be sized using "UNDEFINED" in
// the main size. Otherwise use "AT_MOST" in the cross axis.
if (!isMainAxisRow && YGFloatIsUndefined(childWidth) && widthMode != YGMeasureModeUndefined) {
// If the size of the parent is defined then try to constrain the absolute child to that size
// as well. This allows text within the absolute child to wrap to the size of its parent.
// This is the same behavior as many browsers implement.
if (!isMainAxisRow && YGFloatIsUndefined(childWidth) && widthMode != YGMeasureModeUndefined && width > 0) {
childWidth = width;
childWidthMeasureMode = YGMeasureModeAtMost;
}