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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="togglebutton.py" xml:lang="ca">
<info>
<title type="text">ToggleButton (Python)</title>
<link type="guide" xref="beginner.py#buttons"/>
<link type="next" xref="switch.py"/>
<revision version="0.1" date="2012-05-23" 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 button which retains state</desc>
</info>
<title>ToggleButton</title>
<media type="image" mime="image/png" src="media/togglebutton.png"/>
<p>When this ToggleButton is in an active state, the spinner spins.</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
import sys
class MyWindow(Gtk.ApplicationWindow):
# a window
def __init__(self, app):
Gtk.Window.__init__(
self, title="ToggleButton Example", application=app)
self.set_default_size(300, 300)
self.set_border_width(30)
# a spinner animation
self.spinner = Gtk.Spinner()
# with extra horizontal space
self.spinner.set_hexpand(True)
# with extra vertical space
self.spinner.set_vexpand(True)
# a togglebutton
button = Gtk.ToggleButton.new_with_label("Start/Stop")
# connect the signal "toggled" emitted by the togglebutton
# when its state is changed to the callback function toggled_cb
button.connect("toggled", self.toggled_cb)
# a grid to allocate the widgets
grid = Gtk.Grid()
grid.set_row_homogeneous(False)
grid.set_row_spacing(15)
grid.attach(self.spinner, 0, 0, 1, 1)
grid.attach(button, 0, 1, 1, 1)
# add the grid to the window
self.add(grid)
# callback function for the signal "toggled"
def toggled_cb(self, button):
# if the togglebutton is active, start the spinner
if button.get_active():
self.spinner.start()
# else, stop it
else:
self.spinner.stop()
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)
</code>
</section>
<section id="methods">
<title>Useful methods for a ToggleButton widget</title>
<p>In line 22 the signal <code>"toggled"</code> is connected to the callback function <code>toggled_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 References</title>
<p>In this sample we used the following:</p>
<list>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkToggleButton.html">GtkToggleButton</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkWidget.html">GtkWidget</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkSpinner.html">GtkSpinner</link></p></item>
</list>
</section>
</page>
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