menu.cpp

// g++ -std=c++11 `pkg-config gtkmm-2.4 --cflags --libs` -o menu menu.cpp

#include <iostream>
#include <gtkmm.h>
#include <gtkmm/stock.h>

class MenuWindow: public Gtk::Window {
public:
  MenuWindow() {
    add(m_Box);
    m_refActionGroup = Gtk::ActionGroup::create();
    m_refActionGroup->add(Gtk::Action::create("FileMenu", "File"));
    m_refActionGroup->add(Gtk::Action::create("FileOpen",
					      Gtk::Stock::OPEN, "_Open"),
			  sigc::mem_fun(*this, &MenuWindow::on_menu_file_open));
    m_refActionGroup->add(Gtk::Action::create("FileSave",
					      Gtk::Stock::SAVE, "_Save"),
			  sigc::mem_fun(*this, &MenuWindow::on_menu_file_save));
    m_refActionGroup->add(Gtk::Action::create("FileQuit",
					      Gtk::Stock::QUIT, "_Quit"),
			  sigc::mem_fun(*this, &MenuWindow::on_menu_file_quit));
    
    m_refUIManager = Gtk::UIManager::create();
    m_refUIManager->insert_action_group(m_refActionGroup);
    add_accel_group(m_refUIManager->get_accel_group());

    Glib::ustring ui_info =
      "<ui>"
      "  <menubar name='MenuBar'>"
      "    <menu action='FileMenu'>"
      "      <menuitem action='FileOpen'/>"
      "      <menuitem action='FileSave'/>"
      "      <separator/>"
      "      <menuitem action='FileQuit'/>"
      "    </menu>"
      "  </menubar>"
      "</ui>";
    
    try {
      m_refUIManager->add_ui_from_string(ui_info);
    } catch (const Glib::Error& ex) {
      std::cerr << "building menus failed: " << ex.what();
    }

    auto pMenubar = m_refUIManager->get_widget("/MenuBar");
    if (pMenubar)
      m_Box.pack_start(*pMenubar, Gtk::PACK_SHRINK);
    show_all_children();
  }
  
  virtual ~MenuWindow() {}
protected:
  void on_menu_file_open() {
    Gtk::FileChooserDialog dialog("Please choose a file",
				  Gtk::FILE_CHOOSER_ACTION_OPEN);
    dialog.set_transient_for(*this);
    dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
    dialog.add_button(Gtk::Stock::OPEN, Gtk::RESPONSE_OK);
    Gtk::FileFilter filter_text;
    filter_text.set_name("Text files");
    filter_text.add_mime_type("text/plain");
    dialog.add_filter(filter_text);
    Gtk::FileFilter filter_any;
    filter_any.set_name("Any files");
    filter_any.add_pattern("*");
    dialog.add_filter(filter_any);
    int result = dialog.run();
    switch(result) {
    case(Gtk::RESPONSE_OK):
      {
	std::cout << "Open clicked." << std::endl;
	std::string filename = dialog.get_filename();
	std::cout << "File selected: " <<  filename << std::endl;
      break;
      }
    case(Gtk::RESPONSE_CANCEL):
      std::cout << "Cancel clicked." << std::endl;
      break;
    default:
      std::cout << "Unexpected button clicked." << std::endl;
      break;
    }
  }
  void on_menu_file_save() {
    Gtk::FileChooserDialog dialog("Please choose a file",
				  Gtk::FILE_CHOOSER_ACTION_SAVE);
    dialog.set_transient_for(*this);
    dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
    dialog.add_button(Gtk::Stock::OPEN, Gtk::RESPONSE_OK);
    Gtk::FileFilter filter_text;
    filter_text.set_name("Text files");
    filter_text.add_mime_type("text/plain");
    dialog.add_filter(filter_text);
    Gtk::FileFilter filter_any;
    filter_any.set_name("Any files");
    filter_any.add_pattern("*");
    dialog.add_filter(filter_any);
    int result = dialog.run();
    switch(result) {
    case(Gtk::RESPONSE_OK):
      {
	std::cout << "Open clicked." << std::endl;
	std::string filename = dialog.get_filename();
	std::cout << "File selected: " <<  filename << std::endl;
      break;
      }
    case(Gtk::RESPONSE_CANCEL):
      std::cout << "Cancel clicked." << std::endl;
      break;
    default:
      std::cout << "Unexpected button clicked." << std::endl;
      break;
    }
  }
  void on_menu_file_quit() {
    hide();
  }
  Gtk::VBox m_Box;
  Glib::RefPtr<Gtk::UIManager> m_refUIManager;
  Glib::RefPtr<Gtk::ActionGroup> m_refActionGroup;
};

int main(int argc, char** argv) {
  Gtk::Main kit(argc, argv);
  MenuWindow window;
  Gtk::Main::run(window);

  return 0;
}