<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="spinner.py" xml:lang="pt-BR">

  <info>

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

    <link type="guide" xref="beginner.py#display-widgets"/>

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

    <revision version="0.2" date="2012-06-12" 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 spinner animation</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>Spinner</title>

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

  
This Spinner is stopped and started by pressing the spacebar.

  <links type="section"/>

  <section id="code">

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

  from gi.repository import Gtk

from gi.repository import Gdk

import sys

class MyWindow(Gtk.ApplicationWindow):

    # a window

    def __init__(self, app):

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

        self.set_default_size(200, 200)

        self.set_border_width(30)

        # a spinner

        self.spinner = Gtk.Spinner()

        # that by default spins

        self.spinner.start()

        # add the spinner to the window

        self.add(self.spinner)

    # event handler

    # a signal from the keyboard (space) controls if the spinner stops/starts

    def do_key_press_event(self, event):

        # keyname is the symbolic name of the key value given by the event

        keyname = Gdk.keyval_name(event.keyval)

        # if it is "space"

        if keyname == "space":

            # and the spinner is active

            if self.spinner.get_property("active"):

                # stop the spinner

                self.spinner.stop()

            # if the spinner is not active

            else:

                # start it again

                self.spinner.start()

        # stop the signal emission

        return True

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)

  <note>

    Gdk.keyval_name(event.keyval) converts the key value event.keyval into a symbolic name. The names and corresponding key values can be found <link href="http://git.gnome.org/browse/gtk+/tree/gdk/gdkkeysyms.h">here</link>,but for instance GDK_KEY_BackSpace becomes the string "BackSpace".

  
</note>

  </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/GtkSpinner.html">GtkSpinner</link>
</item>

    <item>
<link href="http://developer.gnome.org/gdk/stable/gdk-Keyboard-Handling.html">Key Values</link>
</item>

  </list>

  </section>

</page>