Brightness Lord

#!/usr/bin/env python

import gtk
#import sys
import os
global ab
ab = 0

class SystrayIconApp:

    def __init__(self):
        self.tray = gtk.StatusIcon()
        self.tray.set_from_file("desktop-icon.png")
        self.tray.connect('popup-menu', self.on_right_click)
        self.tray.connect('activate', self.on_left_click)
        self.tray.set_tooltip(('Brightness Lord'))


        #global window
        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
        self.window.set_title("Brightness Lord")
        self.window.set_position(gtk.WIN_POS_MOUSE)
        self.window.set_default_size(20, 150)
        gtk.Window.set_decorated(self.window,0)
        adjustment = gtk.Adjustment(value=0, lower=0, upper=0.9)
        self.scale = gtk.VScale(adjustment)
        #self.scale.set_digits(1)
        self.scale.set_draw_value(0)
        self.scale.set_update_policy(gtk.UPDATE_DELAYED)

        self.window.connect("destroy", lambda w: gtk.main_quit())
        self.scale.connect("value-changed", self.scale_moved)

        self.window.add(self.scale)


    def on_right_click(self, icon, event_button, event_time):
        self.make_menu(event_button, event_time)


    def make_menu(self, event_button, event_time):
        menu = gtk.Menu()

        clear = gtk.MenuItem("Display OFF")
        clear.show()
        menu.append(clear)
        clear.connect('activate', self.off)

        #show about dialog
        about = gtk.MenuItem("About")
        about.show()
        menu.append(about)
        about.connect('activate', self.show_about_dialog)

        # add quit item
        quit = gtk.MenuItem("Quit")
        quit.show()
        menu.append(quit)
        quit.connect('activate', gtk.main_quit)

        menu.popup(None, None, gtk.status_icon_position_menu,
                   event_button, event_time, self.tray)

    def on_left_click(self, widget):
        global ab
        if ab == 0:
            self.window.show_all()
            ab = 1
        else:
            self.window.hide()
            ab = 0

    def show_about_dialog(self, widget):
        about_dialog = gtk.AboutDialog()
        about_dialog.set_destroy_with_parent (True)
        about_dialog.set_icon_name ("Brightness Lord")
        about_dialog.set_name('Brightness Lord')
        about_dialog.set_version('0.1')
        about_dialog.set_comments(("Program to control brightness and turn monitor off"))
        about_dialog.set_authors(['Avogadrus'])
        about_dialog.run()
        about_dialog.destroy()

    def scale_moved(self, event):
        os.system("xrandr --output $(xrandr --current | awk '/ connected/ { print $1 }') --brightness " + str(1 - round(self.scale.get_value(),1)) )

    def off(self, widget):
        os.system("xset dpms force off")

if __name__ == "__main__":
    SystrayIconApp()
    gtk.main()