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<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="de">
<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>Mario Blättermann</mal:name>
<mal:email>mario.blaettermann@gmail.com</mal:email>
<mal:years>2011, 2013</mal:years>
</mal:credit>
</info>
<title>AboutDialog</title>
<media type="image" mime="image/png" src="media/aboutdialog_GMenu.png"/>
<p>An AboutDialog example using Gtk.ApplicationWindow and Menu (the "about" is displayed if "About" in the menu is selected).</p>
<links type="section"/>
<section id="code">
<title>Code used to generate this example</title>
<code mime="text/x-python" style="numbered">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)
</code>
</section>
<section id="methods">
<title>Useful methods for an AboutDialog widget</title>
<p>In line 15 the signal <code>"activate"</code> is connected to the callback function <code>about_cb()</code> using <code><var>widget</var>.connect(<var>signal</var>, <var>callback function</var>)</code>. See <link xref="signals-callbacks.py"/> for a more detailed explanation.</p>
</section>
<section id="references">
<title>API-Referenzen</title>
<p>
In this sample we used the following:
</p>
<list>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkAboutDialog.html">GtkAboutDialog</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkApplicationWindow.html">GtkApplicationWindow</link></p></item>
<item><p><link href="http://developer.gnome.org/gio/stable/GMenu.html">GMenu</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkApplication.html">GtkApplication</link></p></item>
</list>
</section>
</page>
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