# Spinner (Python)

Marta Maria Casetti
mmcasetti@gmail.com 2012
A spinner animation

# Spinner

This Spinner is stopped and started by pressing the spacebar.

# Code used to generate this example

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)

`Gdk.keyval_name(event.keyval)` converts the key value `event.keyval` into a symbolic name. The names and corresponding key values can be found here, but for instance `GDK_KEY_BackSpace` becomes the string `"BackSpace"`.

# API References

In this sample we used the following:

GtkSpinner

Key Values