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Bug 1598132 - Add GetPrevContinuationOrIBSplitSibling() and improve GetNextContinuationOrIBSplitSibling() in nsLayoutUtils. r=emilio

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Differential Revision: https://phabricator.services.mozilla.com/D54037
This commit is contained in:
Ting-Yu Lin
2019-11-20 22:31:31 +00:00
parent e93035e52a
commit dfe559f45c
3 changed files with 32 additions and 15 deletions
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31
layout/base/nsLayoutUtils.cpp
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@@ -4776,16 +4776,31 @@ nsIFrame* nsLayoutUtils::GetDisplayListParent(nsIFrame* aFrame) {
return nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(aFrame);
}
nsIFrame* nsLayoutUtils::GetNextContinuationOrIBSplitSibling(nsIFrame* aFrame) {
nsIFrame* result = aFrame->GetNextContinuation();
if (result) return result;
nsIFrame* nsLayoutUtils::GetPrevContinuationOrIBSplitSibling(
const nsIFrame* aFrame) {
if (nsIFrame* result = aFrame->GetPrevContinuation()) {
return result;
}
if ((aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) != 0) {
// We only store the ib-split sibling annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
aFrame = aFrame->FirstContinuation();
if (aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
// We are the first frame in the continuation chain. Get the ib-split prev
// sibling property stored in us.
return aFrame->GetProperty(nsIFrame::IBSplitPrevSibling());
}
return aFrame->GetProperty(nsIFrame::IBSplitSibling());
return nullptr;
}
nsIFrame* nsLayoutUtils::GetNextContinuationOrIBSplitSibling(
const nsIFrame* aFrame) {
if (nsIFrame* result = aFrame->GetNextContinuation()) {
return result;
}
if (aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
// We only store the ib-split sibling annotation with the first frame in the
// continuation chain.
return aFrame->FirstContinuation()->GetProperty(nsIFrame::IBSplitSibling());
}
return nullptr;