void
StickyScrollContainer::UpdatePositions(nsPoint aScrollPosition,
nsIFrame* aSubtreeRoot)
{
#ifdef DEBUG
{
nsIFrame* scrollFrameAsFrame = do_QueryFrame(mScrollFrame);
NS_ASSERTION(!aSubtreeRoot || aSubtreeRoot == scrollFrameAsFrame,
"If reflowing, should be reflowing the scroll frame");
}
#endif
mScrollPosition = aScrollPosition;
OverflowChangedTracker oct;
oct.SetSubtreeRoot(aSubtreeRoot);
for (nsTArray<nsIFrame*>::size_type i = 0; i < mFrames.Length(); i++) {
nsIFrame* f = mFrames[i];
if (aSubtreeRoot) {
// Reflowing the scroll frame, so recompute offsets.
ComputeStickyOffsets(f);
}
// mFrames will only contain first continuations, because we filter in
// nsIFrame::Init.
PositionContinuations(f);
for (nsIFrame* cont = f; cont; cont = cont->GetNextContinuation()) {
oct.AddFrame(cont);
}
}
oct.Flush();
}
static void
AddSubtreeToOverflowTracker(nsIFrame* aFrame,
OverflowChangedTracker& aOverflowChangedTracker)
{
if (aFrame->FrameMaintainsOverflow()) {
aOverflowChangedTracker.AddFrame(aFrame,
OverflowChangedTracker::CHILDREN_CHANGED);
}
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* child : lists.CurrentList()) {
AddSubtreeToOverflowTracker(child, aOverflowChangedTracker);
}
}
}
void
StickyScrollContainer::UpdatePositions(nsPoint aScrollPosition,
nsIFrame* aSubtreeRoot)
{
#ifdef DEBUG
{
nsIFrame* scrollFrameAsFrame = do_QueryFrame(mScrollFrame);
NS_ASSERTION(!aSubtreeRoot || aSubtreeRoot == scrollFrameAsFrame,
"If reflowing, should be reflowing the scroll frame");
}
#endif
mScrollPosition = aScrollPosition;
OverflowChangedTracker oct;
oct.SetSubtreeRoot(aSubtreeRoot);
for (nsTArray<nsIFrame*>::size_type i = 0; i < mFrames.Length(); i++) {
nsIFrame* f = mFrames[i];
if (!nsLayoutUtils::IsFirstContinuationOrIBSplitSibling(f)) {
// This frame was added in nsFrame::Init before we knew it wasn't
// the first ib-split-sibling.
mFrames.RemoveElementAt(i);
--i;
continue;
}
if (aSubtreeRoot) {
// Reflowing the scroll frame, so recompute offsets.
ComputeStickyOffsets(f);
}
// mFrames will only contain first continuations, because we filter in
// nsIFrame::Init.
PositionContinuations(f);
f = f->GetParent();
if (f != aSubtreeRoot) {
for (nsIFrame* cont = f; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
oct.AddFrame(cont, OverflowChangedTracker::CHILDREN_CHANGED);
}
}
}
oct.Flush();
}