[PyQt] SubClassed checkbox signal problem

[Phil Thompson]

On Thu, 9 Sep 2010 21:12:26 +0200, Peter Liedler <peter at liedler.at> wrote:
> Hello,
> 
> I am testing the current beta of (k)ubuntu 10.10 maverick meerkat and 
> recognized that my pyqt application stopped to work properly.
> 
> After some time of research I could tie the problem down to the
following 
> situation:
> 
> I have a qcheckbox in a subclassed qobject and connected the sigal 
> statechanged which works perfectly in the previous versions. E.g. ubuntu

> lucid.
> I also checked if the signal works without a subclass - it does on both
> pyqt 
> versions.
> 
> There might be a problem in my code as well which was not causing
> malfunction 
> before, so please see the code below. It could also be a bug in the nerw

> version?
> 
> Can you take a look into this and help me?

You need to call QObject.__init__() from workLoadItem.__init__().

Phil

> Thank you
> 
> Peter
> 
> ------------------------------------
> 
> #!/usr/bin/python
> # -*- coding: utf-8 -*-
> 
> # test
> #
> 
> 
> #signal stateChanged of subclass is called correctly in python-qt4 
> 4.7.3-1ubuntu2~lucid1~ppa3 on lucid lynx
> #
> #does not work on maverick meerkat beta: Version: 4.7.4-0ubuntu1
> 
> import sys, os
> import locale
> from os.path import dirname, join
> import time
> 
> try:
>   from PyQt4.QtGui import *
>   from PyQt4 import QtCore
>   from PyQt4.QtCore import *
>   import urllib
> except:
>   print "Loading of python libraries failed, please install python-qt4"
>   exit(1)
> 
> 
> class vidgrabMainWindow(QMainWindow):
>     """ Main window of jase """
>     def __init__(self, parent=None):
>         QMainWindow.__init__(self, parent)
> 	self.setMinimumSize(800,200)
> 	self.setupWindow()
> 
>     def setupWindow(self):
> 	""" Initialize main widget """
> 
> 	self.mainWidget = QWidget(self)
> 	self.setCentralWidget(self.mainWidget)
> 
> 	self.buttonLayout = QGridLayout()
> 	self.buttonLayout.setSpacing(3)
> 	self.mainWidget.setLayout(self.buttonLayout)
> 	self.checkSub = workLoadItem(self)
> 
> class workLoadItem(QObject):
> 
>     def __init__(self, parent=None):
> 	self.parent = parent
> 	self.name = QLabel()
> 	self.name.setText("...")
> 	self.checkBox = QCheckBox()
> 	self.checkBox.setText("Test")
> 	self.connect(self.checkBox, SIGNAL("stateChanged(int)"), 
> self.checkCalled)
> 	self.parent.buttonLayout.addWidget(self.checkBox, 0, 1)
> 
>     def checkCalled(self, i = None):
> 	if i == 2:
> 	  self.checkBox.setText("Checked")
> 	elif i == 0:
> 	  self.checkBox.setText("UnChecked")
> 	else:
> 	  self.checkBox.setText("None")
> 
> 
> def main():
>     app = QApplication(sys.argv)
>     app.setOrganizationName("jackcy")
>     app.setOrganizationDomain("...")
>     app.setApplicationName("test")
>     app.connect(app, SIGNAL("lastWindowClosed()"), app, SLOT("quit()"))
>     
>     form = vidgrabMainWindow()
>     form.show()
> 
>     app.exec_()
>     
>     def quit(self):
>         QApplication.quit(self)
> 
> 
> if __name__ == '__main__':
>   """ Main function """
>   main()
>   
> 
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