void on_size_allocate (Gtk::Allocation&);
bool on_query_tooltip (int, int, bool, const Glib::RefPtr<Gtk::Tooltip>&);
gint mouse_shuttle (double x, bool force);
void on_size_allocate (Gtk::Allocation&);
bool on_query_tooltip (int, int, bool, const Glib::RefPtr<Gtk::Tooltip>&);
gint mouse_shuttle (double x, bool force);