Paste code

#!/usr/bin/python

import gobject
import gtk

ui_info_main = \
'''<ui>
    <toolbar name='ToolBar'>
        <toolitem action='Start' />
        <toolitem action='Stop' />
        <separator />
        <toolitem action='Quit' />
    </toolbar>
</ui>'''


class ApplicationMainWindow( gtk.Window ):
    def __init__( self, parent = None ):
        gtk.Window.__init__(self)
        try:
            self.set_screen( parent.get_screen() )
        except AttributeError:
            self.connect( 'destroy', lambda *w: gtk.main_quit() )

        self.set_title( 'Countdown' )
        self.set_default_size( 160, 60 )

        merge = gtk.UIManager()
        self.set_data( 'ui-manager', merge )
        merge.insert_action_group( self.__create_action_group(), 0 )
        self.add_accel_group( merge.get_accel_group() )

        try:
            mergeid = merge.add_ui_from_string( ui_info_main )
        except gobject.GError, msg:
            print "building menu failed: %s" % msg

        table = gtk.Table( 1, 4, False )
        self.add( table )

        bar = merge.get_widget( "/ToolBar" )
        bar.set_tooltips( True )
        bar.show()
        table.attach( bar,
                0, 1,                   0, 1,
                gtk.EXPAND | gtk.FILL,  0,
                0,                      0 );

        self.textentry = gtk.Entry()
        self.textentry.set_max_length(5)
        self.textentry.set_text( '60' )
        self.textentry.show()
        table.attach( self.textentry,
                0, 1,                   1, 2,
                gtk.EXPAND | gtk.FILL,  0,
                0,                      0 );

        self.show_all()


    def __create_action_group( self ):
        entries = (
                ( 'Start', gtk.STOCK_MEDIA_PLAY, '_Start', '<control>s', 'Start', self.action_start ),
                ( 'Stop', gtk.STOCK_MEDIA_STOP, '_Stop', None, 'Stop', self.action_stop ),
                ( 'Quit', gtk.STOCK_QUIT, '_Quit', '<control>Q', 'Quit', self.action_quit )
        );

        action_group = gtk.ActionGroup( 'AppWindowActions' )
        action_group.add_actions( entries )

        return action_group

    def action_start( self, action ):
        if self.textentry.get_text() > 0:
            self.counter = int( self.textentry.get_text() )
        else:
            self.counter = 60
        gobject.timeout_add( 1000, self.counter_decrement )

    def action_stop( self, action ):
        self.counter = 0

    def action_quit( self, action ):
        gtk.main_quit()

    def countdown_end( self ):
        dialog = gtk.MessageDialog(self,
                gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
                gtk.MESSAGE_INFO, gtk.BUTTONS_OK,
                "Countdown is end" )
        dialog.set_property( 'title', 'Countdown' )
        dialog.run()
        dialog.destroy()
        self.set_keep_above( False )

    def counter_decrement( self ):
        if self.counter > 0:
            self.counter -= 1
        else:
            return 0

        self.textentry.set_text( str( self.counter ) )

        if self.counter == 0:
            self.countdown_end()
            return 0
        elif self.counter == 1:
            self.set_keep_above( True )

        gobject.timeout_add( 1000, self.counter_decrement )

def main():
    ApplicationMainWindow()
    gtk.main()

if __name__ == '__main__':
    main()