// this differs from other remove functions because it forcibly removes all the children,
// regardless of read-only status or event exceptions, e.g.
void ContainerNode::removeChildren()
{
if (!m_firstChild)
return;
// The container node can be removed from event handlers.
RefPtr<ContainerNode> protect(this);
// exclude this node when looking for removed focusedNode since only children will be removed
document().removeFocusedNodeOfSubtree(this, true);
#if ENABLE(FULLSCREEN_API)
document().removeFullScreenElementOfSubtree(this, true);
#endif
// Do any prep work needed before actually starting to detach
// and remove... e.g. stop loading frames, fire unload events.
willRemoveChildren(protect.get());
NodeVector removedChildren;
{
WidgetHierarchyUpdatesSuspensionScope suspendWidgetHierarchyUpdates;
{
NoEventDispatchAssertion assertNoEventDispatch;
removedChildren.reserveInitialCapacity(childNodeCount());
while (RefPtr<Node> n = m_firstChild) {
removedChildren.append(m_firstChild);
removeBetween(0, m_firstChild->nextSibling(), m_firstChild);
}
}
childrenChanged(false, 0, 0, -static_cast<int>(removedChildren.size()));
for (size_t i = 0; i < removedChildren.size(); ++i)
ChildNodeRemovalNotifier(this).notify(removedChildren[i].get());
}
dispatchSubtreeModifiedEvent();
}
// this differs from other remove functions because it forcibly removes all the children,
// regardless of read-only status or event exceptions, e.g.
void ContainerNode::removeChildren()
{
if (!m_firstChild)
return;
// The container node can be removed from event handlers.
RefPtr<ContainerNode> protect(this);
// exclude this node when looking for removed focusedNode since only children will be removed
document()->removeFocusedNodeOfSubtree(this, true);
#if ENABLE(FULLSCREEN_API)
document()->removeFullScreenElementOfSubtree(this, true);
#endif
// Do any prep work needed before actually starting to detach
// and remove... e.g. stop loading frames, fire unload events.
willRemoveChildren(protect.get());
Vector<RefPtr<Node>, 10> removedChildren;
{
WidgetHierarchyUpdatesSuspensionScope suspendWidgetHierarchyUpdates;
NoEventDispatchAssertion assertNoEventDispatch;
removedChildren.reserveInitialCapacity(childNodeCount());
while (RefPtr<Node> n = m_firstChild) {
Node* next = n->nextSibling();
// Remove the node from the tree before calling detach or removedFromDocument (4427024, 4129744).
// removeChild() does this after calling detach(). There is no explanation for
// this discrepancy between removeChild() and its optimized version removeChildren().
n->setPreviousSibling(0);
n->setNextSibling(0);
n->setParentOrHostNode(0);
document()->adoptIfNeeded(n.get());
m_firstChild = next;
if (n == m_lastChild)
m_lastChild = 0;
removedChildren.append(n.release());
}
size_t removedChildrenCount = removedChildren.size();
size_t i;
// Detach the nodes only after properly removed from the tree because
// a. detaching requires a proper DOM tree (for counters and quotes for
// example) and during the previous loop the next sibling still points to
// the node being removed while the node being removed does not point back
// and does not point to the same parent as its next sibling.
// b. destroying Renderers of standalone nodes is sometimes faster.
for (i = 0; i < removedChildrenCount; ++i) {
Node* removedChild = removedChildren[i].get();
if (removedChild->attached())
removedChild->detach();
}
childrenChanged(false, 0, 0, -static_cast<int>(removedChildrenCount));
for (i = 0; i < removedChildrenCount; ++i)
ChildNodeRemovalNotifier(this).notify(removedChildren[i].get());
}
dispatchSubtreeModifiedEvent();
}