void LayoutMultiColumnFlowThread::evacuateAndDestroy()
{
LayoutBlockFlow* multicolContainer = multiColumnBlockFlow();
m_isBeingEvacuated = true;
// Remove all sets and spanners.
while (LayoutBox* columnBox = firstMultiColumnBox()) {
ASSERT(columnBox->isAnonymous());
columnBox->destroy();
}
ASSERT(!previousSibling());
ASSERT(!nextSibling());
// Finally we can promote all flow thread's children. Before we move them to the flow thread's
// container, we need to unregister the flow thread, so that they aren't just re-added again to
// the flow thread that we're trying to empty.
multicolContainer->resetMultiColumnFlowThread();
moveAllChildrenTo(multicolContainer, true);
// We used to manually nuke the line box tree here, but that should happen automatically when
// moving children around (the code above).
ASSERT(!firstLineBox());
destroy();
}
void RenderMultiColumnFlowThread::evacuateAndDestroy()
{
RenderBlockFlow* multicolContainer = multiColumnBlockFlow();
m_beingEvacuated = true;
// Delete the line box tree.
deleteLines();
LayoutStateDisabler layoutStateDisabler(&view());
// First promote all children of the flow thread. Before we move them to the flow thread's
// container, we need to unregister the flow thread, so that they aren't just re-added again to
// the flow thread that we're trying to empty.
multicolContainer->setMultiColumnFlowThread(nullptr);
moveAllChildrenTo(multicolContainer, true);
// Move spanners back to their original DOM position in the tree, and destroy the placeholders.
SpannerMap::iterator it;
while ((it = m_spannerMap.begin()) != m_spannerMap.end()) {
RenderBox* spanner = it->key;
RenderMultiColumnSpannerPlaceholder* placeholder = it->value;
RenderBlockFlow* originalContainer = toRenderBlockFlow(placeholder->parent());
multicolContainer->removeChild(*spanner);
originalContainer->addChild(spanner, placeholder);
placeholder->destroy();
m_spannerMap.remove(it);
}
// Remove all sets.
while (RenderMultiColumnSet* columnSet = firstMultiColumnSet())
columnSet->destroy();
destroy();
}
