sigc::signal<void, int, int> signal_move;
sigc::signal<void, unsigned, unsigned> signal_resize;
sigc::signal<void, unsigned, unsigned, unsigned, unsigned, const Event &> signal_expose;
sigc::signal<void, int, int> signal_move;
sigc::signal<void, unsigned, unsigned> signal_resize;
sigc::signal<void, unsigned, unsigned, unsigned, unsigned, const Event &> signal_expose;