from gi.repository import Gtk

from gi.repository import Gio

import sys

class MyWindow(Gtk.ApplicationWindow):

    def __init__(self, app):

        Gtk.Window.__init__(self, title="Menubutton Example", application=app)

        self.set_default_size(600, 400)

        grid = Gtk.Grid()

        # a menubutton

        menubutton = Gtk.MenuButton()

        menubutton.set_size_request(80, 35)

        grid.attach(menubutton, 0, 0, 1, 1)

        # a menu with two actions

        menumodel = Gio.Menu()

        menumodel.append("New", "app.new")

        menumodel.append("About", "win.about")

        # a submenu with one action for the menu

        submenu = Gio.Menu()

        submenu.append("Quit", "app.quit")

        menumodel.append_submenu("Other", submenu)

        # the menu is set as the menu of the menubutton

        menubutton.set_menu_model(menumodel)

        # the action related to the window (about)

        about_action = Gio.SimpleAction.new("about", None)

        about_action.connect("activate", self.about_callback)

        self.add_action(about_action)

        self.add(grid)

    # callback for "about"

    def about_callback(self, action, parameter):

        print("You clicked \"About\"")

class MyApplication(Gtk.Application):

    def __init__(self):

        Gtk.Application.__init__(self)

    def do_activate(self):

        win = MyWindow(self)

        win.show_all()

    def do_startup(self):

        Gtk.Application.do_startup(self)

        #  the actions related to the application

        new_action = Gio.SimpleAction.new("new", None)

        new_action.connect("activate", self.new_callback)

        self.add_action(new_action)

        quit_action = Gio.SimpleAction.new("quit", None)

        quit_action.connect("activate", self.quit_callback)

        self.add_action(quit_action)

    # callback functions for the actions related to the application

    def new_callback(self, action, parameter):

        print("You clicked \"New\"")

    def quit_callback(self, action, parameter):

        print("You clicked \"Quit\"")

        self.quit()

app = MyApplication()

exit_status = app.run(sys.argv)

sys.exit(exit_status)