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Map intersectionRect to the coordinate space of the target document.

Browse source 
Spec says: "Map intersectionRect to the coordinate space of the
viewport of the Document containing the target."
Tag #249
This commit is contained in:
wolfbeast 2018-12-22 14:10:14 +01:00 • committed by Roy Tam
commit 475d865c14
1 changed files with 8 additions and 7 deletions
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15
dom/base/DOMIntersectionObserver.cpp
View file

@ -319,6 +319,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
nsIFrame* targetFrame = target->GetPrimaryFrame();
nsRect targetRect;
Maybe<nsRect> intersectionRect;
bool isSameDoc = root && root->GetComposedDoc() == target->GetComposedDoc();
if (rootFrame && targetFrame) {
// If mRoot is set we are testing intersection with a container element
@ -327,7 +328,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
// Skip further processing of this target if it is not in the same
// Document as the intersection root, e.g. if root is an element of
// the main document and target an element from an embedded iframe.
if (target->GetComposedDoc() != root->GetComposedDoc()) {
if (!isSameDoc) {
continue;
}
// Skip further processing of this target if is not a descendant of the
@ -399,12 +400,12 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
intersectionRectRelativeToRoot,
rootIntersectionRect
);
if (intersectionRect.isSome()) {
intersectionRect = Some(nsLayoutUtils::TransformFrameRectToAncestor(
nsLayoutUtils::GetContainingBlockForClientRect(rootFrame),
intersectionRect.value(),
targetFrame->PresContext()->PresShell()->GetRootScrollFrame()
));
if (intersectionRect.isSome() && !isSameDoc) {
nsRect rect = intersectionRect.value();
nsPresContext* presContext = targetFrame->PresContext();
nsLayoutUtils::TransformRect(rootFrame,
presContext->PresShell()->GetRootScrollFrame(), rect);
intersectionRect = Some(rect);
}
}