LearningPython Forums - Passing extra information to signal handlers

Passing extra information to signal handlers

selsine — Thu, 15 Feb 2007 10:08:05 -0500

The other day I got the following comment from foxmjay posted on my Creating a GUI using PyGTK and Glade tutorial:

hi
thank you for this tutorial, i just started learning pygtk but it take much time to make GUI with gtk directly in code so i searched for something like qt-designer and here i found this nice tutorial :) .but i have a question how to call a function with arguments when the button is pressed , i mean i want to call this function :

def btnHelloWorld_clicked(self, widget, txt):
print “Hello World! %s” % txt

so how could i mention the argument txt :

dic = { “on_btnHelloWorld_clicked” : self.btnHelloWorld_clicked}
self.wTree.signal_autoconnect(dic)

thanks

Thankfully the solution is quite simple since you can specify extra callback data when you connect a signal with its handler (a simple example):


#!/usr/bin/env python

import sys
try:
 	import pygtk
  	pygtk.require("2.0")
except:
  	pass
try:
	import gtk
  	import gtk.glade
except:
	sys.exit(1)

class simpleData(object):

	def __init__(self, text):
		self.text = text

class HellowWorldGTK:
	"""This is an Hello World GTK application"""
	def __init__(self):

		#Set the Glade file
		self.gladefile = "pyhelloworld.glade"
		self.wTree = gtk.glade.XML(self.gladefile)

		#Create our dictionay and connect it
		dic = {"on_MainWindow_destroy" : gtk.main_quit }
		self.wTree.signal_autoconnect(dic)

		button = self.wTree.get_widget("btnHelloWorld")
		button.connect("clicked", self.btnHelloWorld_clicked
			, simpleData("Text"))

	def btnHelloWorld_clicked(self, widget, data):
		print "Hello World: ", data.text
		data.text = "New Text"

if __name__ == "__main__":
	hwg = HellowWorldGTK()
	gtk.main()

The results from running this and clicking the button twice are:


Hello World: Text
Hello World: New Text

So I decided to post this information here just in case anyone else has a similar question, or knows of a better way to do this. Generally I would probably just add a member to the class that contains this information but perhaps there are some obvious reasons when doing this would be very useful, and I'm just missing them.

selsine.

Passing extra information to signal handlers

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