boost::signals2::signal<void ()> historyUIClicked;
boost::signals2::signal<void ()> settingsClicked;
boost::signals2::signal<void ()> closeMoreMenuClicked;
+ boost::signals2::signal<void ()> zoomUIClicked;
boost::signals2::signal<void ()> switchToMobileMode;
boost::signals2::signal<void ()> switchToDesktopMode;
boost::signals2::signal<bool ()> isBookmark;