Custom GUI Tutorial

#!/usr/bin/env python

import gtk
import gobject
import gladevcp.makepins
from gladevcp.gladebuilder import GladeBuilder
import hal
import sys,os

# set up paths to files
BASE = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), ".."))
libdir = os.path.join(BASE, "lib", "python")
sys.path.insert(0, libdir)
datadir = os.path.join(BASE, "share", "linuxcnc")
xmlname = os.path.join(datadir,"gui3.glade")

import linuxcnc

class gui3(object):

  def __init__(self):
    self.emc = linuxcnc
    self.status = self.emc.stat()
    self.builder = gtk.Builder()
    self.builder.add_from_file(xmlname)
    self.halcomp = hal.component("gui3")
    self.builder.connect_signals(self)
    self.window = self.builder.get_object("window1")
    self.window.show()
    self.panel = gladevcp.makepins.GladePanel(self.halcomp, xmlname, self.builder, None)
    self.halcomp.ready()
    # The gobject.timeout_add() function sets a function to be called at regular intervals
    gobject.timeout_add(100, self.periodic) # time between calls to the function, in milliseconds
    self.machine_status = 0

  def periodic(self): # fetch status items and update screen
    self.status.poll()

    data = self.status.actual_position[0]
    text = "% 9.4f"% (data)
    self.builder.get_object("dro_x").set_text(text)

    data = self.status.actual_position[1]
    text = "% 9.4f"% (data)
    self.builder.get_object("dro_y").set_text(text)

    data = self.status.actual_position[2]
    text = "% 9.4f"% (data)
    self.builder.get_object("dro_z").set_text(text)

    return True # must return True to keep running

  def on_hal_stat1_mode_mdi(self, widget, data=None):
    self.mode_mdi = 1

  def on_test_button_clicked(self, widget, data=None):
    self.status.poll()
    print self.machine_status

  def on_window1_destroy(self, widget, data=None):
    print "quit with cancel"
    gtk.main_quit()

  def on_gtk_quit_activate(self, menuitem, data=None):
    print "quit from menu"
    gtk.main_quit()

if __name__ == "__main__":
  app = gui3()
  gtk.main()