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Python e GTK 3: PyGObject Gtk.MenuBar()

Utilizando Gtk.MenuBar() com a linguagem de programação Python (PyGObject).

Exemplo

Python PyGObject Gtk.MenuBar()

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# -*- coding: utf-8 -*-
"""Python e GTK 3: PyGObject Gtk.MenuBar()."""

import gi

gi.require_version(namespace='Gtk', version='3.0')

from gi.repository import Gio, Gtk


class MainWindow(Gtk.ApplicationWindow):

    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        self.set_title(title='Gtk.MenuBar')
        self.set_default_size(width=1366 / 2, height=768 / 2)
        self.set_position(position=Gtk.WindowPosition.CENTER)
        self.set_default_icon_from_file(filename='../../assets/icons/icon.png')

        vbox = Gtk.Box.new(orientation=Gtk.Orientation.VERTICAL, spacing=12)
        self.add(widget=vbox)

        # Criando a barra de menu.
        menubar = Gtk.MenuBar.new()
        # Adicionando a barra de menu no box vertical que está na janela principal.
        vbox.pack_start(child=menubar, expand=False, fill=False, padding=0)

        menu_file = Gtk.Menu.new()
        menu_item_file = Gtk.MenuItem.new_with_label(label='Arquivo')
        menu_item_file.set_submenu(submenu=menu_file)
        menubar.add(widget=menu_item_file)

        item_new = Gtk.MenuItem.new_with_label(label='Novo')
        item_new.connect('activate', self.on_menu_item_clicked)
        menu_file.add(widget=item_new)

        menu_help = Gtk.Menu.new()
        menu_item_help = Gtk.MenuItem.new_with_label(label='Ajuda')
        menu_item_help.set_submenu(submenu=menu_help)
        menubar.add(widget=menu_item_help)

        item_about = Gtk.MenuItem.new_with_label(label='Sobre')
        item_about.connect('activate', self.about)
        menu_help.add(widget=item_about)

        self.show_all()

    def on_menu_item_clicked(self, widget):
        print(widget.get_label())

    def about(self, widget):
        about = Gtk.AboutDialog.new()
        about.set_transient_for(parent=self)
        about.set_authors(authors=['Renato Cruz'])
        about.set_comments(
            comments='Lorem ipsum dolor sit amet, consectetur adipiscing elit, '
                     'sed do eiusmod tempor incididunt ut labore et dolore '
                     'magna aliqua.'
        )
        about.set_website(website='https://github.com/natorsc/gui-python-gtk')
        about.run()
        about.destroy()


class Application(Gtk.Application):

    def __init__(self):
        super().__init__(application_id='br.natorsc.Exemplo',
                         flags=Gio.ApplicationFlags.FLAGS_NONE)

    def do_startup(self):
        Gtk.Application.do_startup(self)

    def do_activate(self):
        win = self.props.active_window
        if not win:
            win = MainWindow(application=self)
        win.present()

    def do_shutdown(self):
        Gtk.Application.do_shutdown(self)


if __name__ == '__main__':
    import sys

    app = Application()
    app.run(sys.argv)