sigc::signal<void> signal_grab_pointer;
sigc::signal<void> signal_ungrab_pointer;
sigc::signal<void, const Time::TimeDelta &> signal_request_animation;
sigc::signal<void> signal_grab_pointer;
sigc::signal<void> signal_ungrab_pointer;
sigc::signal<void, const Time::TimeDelta &> signal_request_animation;