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_()
--
http://mail.python.org/mailman/listinfo/python-list
