void LayoutMultiColumnFlowThread::populate()
{
LayoutBlockFlow* multicolContainer = multiColumnBlockFlow();
ASSERT(!nextSibling());
// Reparent children preceding the flow thread into the flow thread. It's multicol content
// now. At this point there's obviously nothing after the flow thread, but layoutObjects (column
// sets and spanners) will be inserted there as we insert elements into the flow thread.
multicolContainer->moveChildrenTo(this, multicolContainer->firstChild(), this, true);
}
void PaintLayerStackingNode::rebuildZOrderLists() {
#if DCHECK_IS_ON()
DCHECK(m_layerListMutationAllowed);
#endif
DCHECK(isDirtyStackingContext());
for (PaintLayer* child = layer()->firstChild(); child;
child = child->nextSibling())
child->stackingNode()->collectLayers(m_posZOrderList, m_negZOrderList);
// Sort the two lists.
if (m_posZOrderList)
std::stable_sort(m_posZOrderList->begin(), m_posZOrderList->end(),
compareZIndex);
if (m_negZOrderList)
std::stable_sort(m_negZOrderList->begin(), m_negZOrderList->end(),
compareZIndex);
// Append layers for top layer elements after normal layer collection, to
// ensure they are on top regardless of z-indexes. The layoutObjects of top
// layer elements are children of the view, sorted in top layer stacking
// order.
if (layer()->isRootLayer()) {
LayoutBlockFlow* rootBlock = layoutObject()->view();
// If the viewport is paginated, everything (including "top-layer" elements)
// gets redirected to the flow thread. So that's where we have to look, in
// that case.
if (LayoutBlockFlow* multiColumnFlowThread =
rootBlock->multiColumnFlowThread())
rootBlock = multiColumnFlowThread;
for (LayoutObject* child = rootBlock->firstChild(); child;
child = child->nextSibling()) {
Element* childElement = (child->node() && child->node()->isElementNode())
? toElement(child->node())
: 0;
if (childElement && childElement->isInTopLayer()) {
PaintLayer* layer = toLayoutBoxModelObject(child)->layer();
// Create the buffer if it doesn't exist yet.
if (!m_posZOrderList)
m_posZOrderList = wrapUnique(new Vector<PaintLayerStackingNode*>);
m_posZOrderList->append(layer->stackingNode());
}
}
}
#if ENABLE(ASSERT)
updateStackingParentForZOrderLists(this);
#endif
m_zOrderListsDirty = false;
}