virtual void updateContext()
{
defaultAction()->setSelectionContext(selectionContext());
if (selectionContext().isValid()) {
defaultAction()->setEnabled(isEnabled(selectionContext()));
defaultAction()->setVisible(isVisible(selectionContext()));
defaultAction()->setCheckable(true);
QmlItemNode itemNode = QmlItemNode(selectionContext().currentSingleSelectedNode());
if (itemNode.isValid())
defaultAction()->setChecked(itemNode.instanceValue("visible").toBool());
else
defaultAction()->setEnabled(false);
}
}
