Simple chess clock-like app

timer.py

#!/usr/bin/env python

import os
import gtk
import time
import gobject



class ChessTimer(gtk.StatusIcon):
	def __init__(self):
		gtk.StatusIcon.__init__(self)

		# Set icon
		self.set_from_stock(gtk.STOCK_NO)
		self.set_tooltip('00:00:00')

		# Init menu
		actiongroup = gtk.ActionGroup('Actions')
		actiongroup.add_actions([
			('About', gtk.STOCK_ABOUT,
				'A_bout', None,
				None,
				self.on_help
				),
			('Exit', None,
				'E_xit', None,
				None,
				self.on_quit
				)
		])

		manager = gtk.UIManager()
		manager.insert_action_group(actiongroup)
		manager.add_ui_from_string('''
			<popup>
				<menuitem action="About" />
				<separator />
				<menuitem action="Exit" />
			</popup>
		''')

		self.menu = manager.get_widget('/popup')


		# Event handlers
		self.connect('activate', self.on_activate)

		self.connect('popup-menu',
			lambda status, button, time:
				self.menu.popup(None, None, None, button, time)
		)


		# Init local variables and start timer update loop
		self.is_active = False
		self.cached_time = 0
		gobject.timeout_add(990, self.update_timer)


	def on_help (self, data):
		dialog = gtk.AboutDialog()
		dialog.set_name('ChessTimer')
		dialog.set_version('0.0.1')
		dialog.set_comments('Check how much time you spend on any actions')
		dialog.set_website('http://ixth.net/')
		dialog.run()
		dialog.destroy()


	def on_quit (self, data):
		gtk.main_quit()


	def on_activate (self, data):
		self.is_active = not self.is_active
		self.set_from_stock({True: gtk.STOCK_YES, False: gtk.STOCK_NO}[self.is_active])

		if self.is_active:
			self.initial_time = time.time()
		else:
			self.cached_time += time.time() - self.initial_time

	def update_timer (self):
		if self.is_active:
			self.set_tooltip(time.strftime('%H:%M:%S', time.gmtime(time.time() - self.initial_time + self.cached_time)))

		return True

if __name__ == '__main__':
	ChessTimer()
	gtk.main()

Yeah, I use tabs and will burn in hell.

Just tabs are not restricted. Combinations of spaces and tabs are not permitted. So fuck'm all!;)