<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="aboutdialog.py" xml:lang="pt-BR">

  <info>

    <title type="text">AboutDialog (Python)</title>

    <link type="guide" xref="beginner.py#windows"/>

    <link type="next" xref="messagedialog.py"/>

    <revision version="0.1" date="2012-06-11" status="draft"/>

    <credit type="author copyright">

      <name>Marta Maria Casetti</name>

      <email its:translate="no">mmcasetti@gmail.com</email>

      <years>2012</years>

    </credit>

    <desc>A window that displays information about an application</desc>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Rafael Ferreira</mal:name>

      <mal:email>rafael.f.f1@gmail.com</mal:email>

      <mal:years>2013</mal:years>

    </mal:credit>

  </info>

  <title>AboutDialog</title>

  <media type="image" mime="image/png" src="media/aboutdialog_GMenu.png"/>

  
An AboutDialog example using Gtk.ApplicationWindow and Menu (the "about" is displayed if "About" in the menu is selected).

  <links type="section"/>

  <section id="code">

  <title>Code used to generate this example</title>

  from gi.repository import Gtk

from gi.repository import Gio

import sys

class MyWindow(Gtk.ApplicationWindow):

     # constructor for a window (the parent window)

    def __init__(self, app):

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

        self.set_default_size(200, 200)

        # create the about_action (a Gio.SimpleAction)

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

        # connect the signal from the action to the function about_cb()

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

        # add the action to the application

        app.add_action(about_action)

    # callback function for the about_action's "activate" signal

    def about_cb(self, action, parameter):

        # a  Gtk.AboutDialog

        aboutdialog = Gtk.AboutDialog()

        # lists of authors and documenters (will be used later)

        authors = ["GNOME Documentation Team"]

        documenters = ["GNOME Documentation Team"]

        # we fill in the aboutdialog

        aboutdialog.set_program_name("AboutDialog Example")

        aboutdialog.set_copyright(

            "Copyright \xc2\xa9 2012 GNOME Documentation Team")

        aboutdialog.set_authors(authors)

        aboutdialog.set_documenters(documenters)

        aboutdialog.set_website("http://developer.gnome.org")

        aboutdialog.set_website_label("GNOME Developer Website")

        # we do not want to show the title, which by default would be "About AboutDialog Example"

        # we have to reset the title of the messagedialog window after setting

        # the program name

        aboutdialog.set_title("")

        # to close the aboutdialog when "close" is clicked we connect the

        # "response" signal to on_close

        aboutdialog.connect("response", self.on_close)

        # show the aboutdialog

        aboutdialog.show()

    # destroy the aboutdialog

    def on_close(self, action, parameter):

        action.destroy()

class MyApplication(Gtk.Application):

    def __init__(self):

        Gtk.Application.__init__(self)

    def do_activate(self):

        win = MyWindow(self)

        win.show_all()

    def quit_cb(self, action, parameter):

        self.quit()

    def do_startup(self):

        Gtk.Application.do_startup(self)

        # create a menu (a Gio.Menu)

        menu = Gio.Menu()

        # append a menu item with label "About" and action "app.about"

        menu.append("About", "app.about")

        # append a menu item with label "Quit" and action "app.quit"

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

        # set menu as the menu for the application

        self.set_app_menu(menu)

        # a new simpleaction - for the application

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

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

        self.add_action(quit_action)

app = MyApplication()

exit_status = app.run(sys.argv)

sys.exit(exit_status)

  </section>

  <section id="methods">

  <title>Useful methods for an AboutDialog widget</title>

    
In line 15 the signal "activate" is connected to the callback function about_cb() using widget.connect(signal, callback function). See <link xref="signals-callbacks.py"/> for a more detailed explanation.

  </section>

  <section id="references">

  <title>API References</title>

    In this sample we used the following:

  <list>

    <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkAboutDialog.html">GtkAboutDialog</link>
</item>

    <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkApplicationWindow.html">GtkApplicationWindow</link>
</item>

    <item>
<link href="http://developer.gnome.org/gio/stable/GMenu.html">GMenu</link>
</item>

    <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkApplication.html">GtkApplication</link>
</item>

  </list>

  </section>

</page>