QTreeWidget nextSibling()

Q3ListView nextsibling ()method in QTreeWidget.

I am process of coverting Q3ListView and Q3ListItemView to QTreeWidget and QTreeWidgetItem recursively. But I can not find equivalent nextSibling( ) method in QTreeWidget. How do I iterate for next sibling?
CCheckListTreeItem is Q3CheckListItem
m_pListView is Q3ListView and now it is QTreeWidget

Code:

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CCheckListTreeItem * pChild = (CCheckListTreeItem*) m_pListView ->firstChild();
 
	while(pChild)
	{
		if(pChild->isOn())
			strListIDS->append(pChild->text());
		pChild = (CCheckListTreeItem*)pChild->nextSibling();
	}

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Code:

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QTreeWidgetItem *current = ...;
QTreeWidgetItem *parent = current->parent();
QTreeWidgetItem *nextSibling;
if(parent){
  nextSibling =parent()->child(parent->indexOfChild(current)+1);
else {
  QTreeWidget *treeWidget = current->treeWidget();
  nextSibling = treeWidget->topLevelItem(treeWidget->indexOfTopLevelItem(current)+1);
}

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Wasn't that hard, was it? Please at least look at available methods for all the related classes before asking such questions...