const shared_ptr<ViewItem> r = get_mouse_over_item(mouse_point_);
if (!r)
return;
QMenu *menu = r->create_header_context_menu(this);
const shared_ptr<ViewItem> r = get_mouse_over_item(mouse_point_);
if (!r)
return;
QMenu *menu = r->create_header_context_menu(this);