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