<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="checkbutton.py" xml:lang="de">

  <info>

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

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

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

    <revision version="0.1" date="2012-05-09" 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 toggle button in a window</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>CheckButton</title>

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

  
This CheckButton toggles the title.

  <links type="section"/>

  <section id="code">

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

    from gi.repository import Gtk

import sys

class MyWindow(Gtk.ApplicationWindow):

    # a window

    def __init__(self, app):

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

        self.set_default_size(300, 100)

        self.set_border_width(10)

        # a new checkbutton

        button = Gtk.CheckButton()

        #  with a label

        button.set_label("Show Title")

        # connect the signal "toggled" emitted by the checkbutton

        # with the callback function toggled_cb

        button.connect("toggled", self.toggled_cb)

        # by default, the checkbutton is active

        button.set_active(True)

        # add the checkbutton to the window

        self.add(button)

    # callback function

    def toggled_cb(self, button):

        # if the togglebutton is active, set the title of the window

        # as "Checkbutton Example"

        if button.get_active():

            self.set_title("CheckButton Example")

        # else, set it as "" (empty string)

        else:

            self.set_title("")

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)

app = MyApplication()

exit_status = app.run(sys.argv)

sys.exit(exit_status)

  </section>

  <section id="methods">

    <title>Useful methods for a CheckButton widget</title>

    
In line 17 the "toggled" signal is connected to the callback function toggled_cb() using widget.connect(signal, callback function). See <link xref="signals-callbacks.py"/> for a more detailed explanation.

  </section>

  <section id="references">

    <title>API-Referenzen</title>

    
In this sample we used the following:

    <list>

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

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

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

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

    </list>

  </section>

</page>