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Issue #1641 - Implement CSS flow-root keyword

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This is just a clean port of 1322191 and follow-up 1325970. It really seems to add create a new way to access existing code relating to block formatting and floating elements rather than implementing new functionality, and it is mercifully straightforwards.
This commit is contained in:
athenian200 2020-09-03 18:55:28 -05:00 • committed by Roy Tam
commit 9532970df5
15 changed files with 68 additions and 16 deletions
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8
layout/base/nsCSSFrameConstructor.cpp
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@ -2618,7 +2618,8 @@ nsCSSFrameConstructor::ConstructDocElementFrame(Element* aDocEle
newFrame = frameItems.FirstChild();
NS_ASSERTION(frameItems.OnlyChild(), "multiple root element frames");
} else {
MOZ_ASSERT(display->mDisplay == StyleDisplay::Block,
MOZ_ASSERT(display->mDisplay == StyleDisplay::Block ||
display->mDisplay == StyleDisplay::FlowRoot,
"Unhandled display type for root element");
contentFrame = NS_NewBlockFormattingContext(mPresShell, styleContext);
nsFrameItems frameItems;
@ -4741,6 +4742,7 @@ nsCSSFrameConstructor::FindDisplayData(const nsStyleDisplay* aDisplay,
static const FrameConstructionDataByDisplay sDisplayData[] = {
FCDATA_FOR_DISPLAY(StyleDisplay::None, UNREACHABLE_FCDATA()),
FCDATA_FOR_DISPLAY(StyleDisplay::Block, UNREACHABLE_FCDATA()),
FCDATA_FOR_DISPLAY(StyleDisplay::FlowRoot, UNREACHABLE_FCDATA()),
// To keep the hash table small don't add inline frames (they're
// typically things like FONT and B), because we can quickly
// find them if we need to.
@ -4926,7 +4928,7 @@ nsCSSFrameConstructor::ConstructNonScrollableBlockWithConstructor(
StyleDisplay::InlineBlock == aDisplay->mDisplay ||
clipPaginatedOverflow) &&
!aParentFrame->IsSVGText()) {
flags = NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT;
flags = NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS;
if (clipPaginatedOverflow) {
flags |= NS_BLOCK_CLIP_PAGINATED_OVERFLOW;
}
@ -5119,7 +5121,7 @@ nsCSSFrameConstructor::FlushAccumulatedBlock(nsFrameConstructorState& aState,
// is not a suitable block.
nsContainerFrame* blockFrame =
NS_NewMathMLmathBlockFrame(mPresShell, blockContext);
blockFrame->AddStateBits(NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT);
blockFrame->AddStateBits(NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS);
InitAndRestoreFrame(aState, aContent, aParentFrame, blockFrame);
ReparentFrames(this, blockFrame, aBlockItems);