example-3.py

Developing with Gnome一书examples例子代码

#!/usr/bin/env python

# This program displays a couple checkboxes and shows how to change
# button labels, how to make widgets sensitive or unsensitive, how to
# determine if a checkbox is active, how to provide access keys for
# quick keyboard navigation, how to pass other widgets to callbacks
# besides the one that receives the event, and how to manually get gtk
# to update widgets without returning to the main event loop.

import gtk
import gtk.glade
from time import sleep

class ExampleWindow:
  def __init__(self, glade_file):
    # Parse the glade file
    self.main_window = gtk.glade.XML(glade_file)

    # Get the necessary widgets
    self.sensitivity_check_button = \
      self.main_window.get_widget("SensitivityCheckButton")
    self.ooh_tell_me = self.main_window.get_widget("OohTellMe")
    self.quit_button = self.main_window.get_widget("QuitButton")

    # Connect the appropriate callbacks...
    self.main_window.signal_autoconnect(
      {"sensitivity_toggled" : self.sensitivity_toggled,
       "quit_handler"        : self.quit_handler,
       "delete_handler"      : self.delete_handler}
      )
    
  def sensitivity_toggled(self, widget_object):
    self.ooh_tell_me.set_sensitive( self.sensitivity_check_button.get_active() );
    
  def quit_handler(self, extra):
    # If the user checked the OohTellMe button, we need to do some work...
    if self.ooh_tell_me.get_active():

      # Change the checkbutton's label
      self.ooh_tell_me.set_label("M_ock me")

      # Since we don't return to the main event loop, we have to
      # manually tell gtk+ to process the set_label change (and any
      # other changes that require processing).  WARNING: This method
      # is actually obsolete and apparently has potential problems,
      # but I was working with an older version of pygtk and this is
      # the only way that would work.  I was too lazy to try intalling
      # a newer version that might account for the fact that the main
      # loop has moved from gtk to glib.
      while gtk.events_pending():
        gtk.main_iteration(1)

      # Mock the user and give them some time to notice the change
      print "Ha ha, you fell for it!  ",
      print "I will not tell you what that checkbutton does!"
      sleep(1)

    gtk.mainquit();
    
  def delete_handler(self,event,widget_object):
    self.quit_handler(widget_object)

    # No other handlers need be called...
    return gtk.TRUE;

# Create the ExampleWindow
window = ExampleWindow("example-3.glade")

# start the event loop
gtk.main()