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Handle the special case of a flex frame being the absolute containing block correctly from the CSS align code

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JustOff 2019-03-14 19:40:42 +02:00 • committed by Roy Tam
commit dff04053af
6 changed files with 148 additions and 6 deletions
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28
layout/generic/nsAbsoluteContainingBlock.cpp
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@ -409,14 +409,30 @@ OffsetToAlignedStaticPos(const ReflowInput& aKidReflowInput,
? GetOrthogonalAxis(aAbsPosCBAxis)
: aAbsPosCBAxis);
const bool placeholderContainerIsContainingBlock =
aPlaceholderContainer == aKidReflowInput.mCBReflowInput->mFrame;
nsIAtom* parentType = aPlaceholderContainer->GetType();
LogicalSize alignAreaSize(pcWM);
if (parentType == nsGkAtoms::flexContainerFrame) {
// The alignment container is the flex container's content box:
alignAreaSize = aPlaceholderContainer->GetLogicalSize(pcWM);
LogicalMargin pcBorderPadding =
aPlaceholderContainer->GetLogicalUsedBorderAndPadding(pcWM);
alignAreaSize -= pcBorderPadding.Size(pcWM);
// We store the frame rect in FinishAndStoreOverflow, which runs _after_
// reflowing the absolute frames, so handle the special case of the frame
// being the actual containing block here, by getting the size from
// aAbsPosCBSize.
//
// The alignment container is the flex container's content box.
if (placeholderContainerIsContainingBlock) {
alignAreaSize = aAbsPosCBSize.ConvertTo(pcWM, aAbsPosCBWM);
// aAbsPosCBSize is the padding-box, so substract the padding to get the
// content box.
alignAreaSize -=
aPlaceholderContainer->GetLogicalUsedPadding(pcWM).Size(pcWM);
} else {
alignAreaSize = aPlaceholderContainer->GetLogicalSize(pcWM);
LogicalMargin pcBorderPadding =
aPlaceholderContainer->GetLogicalUsedBorderAndPadding(pcWM);
alignAreaSize -= pcBorderPadding.Size(pcWM);
}
} else if (parentType == nsGkAtoms::gridContainerFrame) {
// This abspos elem's parent is a grid container. Per CSS Grid 10.1 & 10.2:
// - If the grid container *also* generates the abspos containing block (a
@ -424,7 +440,7 @@ OffsetToAlignedStaticPos(const ReflowInput& aKidReflowInput,
// the alignment container, too. (And its size is aAbsPosCBSize.)
// - Otherwise, we use the grid's padding box as the alignment container.
// https://drafts.csswg.org/css-grid/#static-position
if (aPlaceholderContainer == aKidReflowInput.mCBReflowInput->mFrame) {
if (placeholderContainerIsContainingBlock) {
// The alignment container is the grid area that we're using as the
// absolute containing block.
alignAreaSize = aAbsPosCBSize.ConvertTo(pcWM, aAbsPosCBWM);