PyQt4 - widget signal trouble

[Joacim Thomassen]

Hello,

I'm trying to get my first PyQt4 application to work as intended, but it 
seems I'm stuck and out of ideas for now.

The program is a simple GUI showing an image. If the image on disk change 
my intension is that the displayed image in my application also change 
accordingly.

What works: The filesystem change is detected and my program prints out 
"Change happened!"

what is the problem: The image shown in the application is not changed.

What am I doing wrong here? Any ideas and suggestions are appreciated.

Best regards,
Joacim Thomassen

My program:
#!/usr/bin/python
"""
familyframe.py

Simple photo frame for the desktop

Author: Joacim Thomassen, 4/2-2009
License: AGPLv3+

Last change: 24/2-2009
"""

from __future__ import division
import sys
from math import *
from PyQt4.QtCore import *
from PyQt4.QtGui import *

import time
import fcntl
import os
import signal

fname = "/home/joacim/.familyframe"

class Watcher(QObject):
	def handler(self, signum, frame):
		self.emit(SIGNAL("imageChange"))
	def __init__(self, parent=None):
		super(Watcher, self).__init__()
		signal.signal(signal.SIGIO, self.handler)
		fd = os.open(fname, os.O_RDONLY)
		fcntl.fcntl(fd, fcntl.F_SETSIG, 0)
		fcntl.fcntl(fd, fcntl.F_NOTIFY, fcntl.DN_MODIFY | 
fcntl.DN_CREATE | fcntl.DN_MULTISHOT)

class ImageWidget(QLabel):
	def __init__(self, parent=None):
		super(QLabel, self).__init__(parent)
		self.image = QImage("/home/joacim/.familyframe/image.jpg")
		self.setMinimumSize(200, 200)
		self.setAlignment(Qt.AlignCenter)
		self.setPixmap(QPixmap.fromImage(self.image))
	def reload(self):
		print "Change happened!"
		self.image.load("/home/joacim/.familyframe/image.jpg")
		self.setPixmap(QPixmap.fromImage(self.image))
		self.update()

class CentralWidget(QWidget):
	def __init__(self, parent=None):
		super(QWidget, self).__init__(parent)
		self.imagewidget = ImageWidget()
		self.box = QHBoxLayout()
		self.box.addWidget(self.imagewidget)
		self.setLayout(self.box)
	def reload(self):
		self.imagewidget.reload()

class MainWindow(QMainWindow):
	def __init__(self, w, parent=None):
		super(MainWindow, self).__init__(parent)
		self.centralwidget = CentralWidget()
		self.setWindowTitle("Family Frame")
		self.setCentralWidget(self.centralwidget)
		self.connect(w, SIGNAL("imageChange"), self.updateUi)
		self.show()
	def updateUi(self):
		self.centralwidget.reload()

if __name__ == "__main__":
	app = QApplication(sys.argv)
	w = Watcher()
	main = MainWindow(w)
	app.exec_()