[PyKDE] QT4 PyQt Wowes - a bug ?

[Dave S]

On Friday 29 September 2006 17:58, David Boddie wrote:
> On Friday 29 September 2006 11:44:36 +0100, Dave S wrote:
> > Now knowing that PyQt4 does not support the QT4  'Qt3Support' module -
> > and having opened and re-saved my QT3 dialogs as QT4 dialogs in QT4
> > designer I realised that the dialogs are simply changed to use the '
> > Qt3Support' module  - I hit a problem !
>
> Yes, that can be a problem. Think of it as an incentive to use the new
> features in Qt 4. ;-)
>
> > So I decided that I would re-make the dialogs in QT4 designer afresh :)
> > Being carefull to not use any QT3 options I re-made my main window.
> >
> > On my XP box I could not find pyuic4 so I
> > used /python24/lib/site-packages/PyQt4/uic/pyuic.py ...
>
> Do you have any of the PyQt4 tools in the /python24/bin directory?
>
> > I am assuming that this is the right thing to do ?
>
> I don't think it matters that much if you use that file directly.
>
> > On execution I get an attribute error 'setcentralwidget' - to make sure
> > it was not something I was doing I made another simple dialog in QT4
> > designer - run it and it works OK
> >
> > I am stuck - I have looked at the output of pyuic and have googled to see
> > if 'setCentralWidget' is supported under PyQt4 - I looked in QDialog &
> > QWidget but cannot find a reference.
>
> OK. The problem is that setCentralWidget() is a QMainWindow method.
>
> From your .ui file, I can see that you've created a main window (based on
> the QMainWindow class) from the following lines:
>
> [...]
>
> >  <class>MainWindow</class>
> >  <widget class="QMainWindow" name="MainWindow" >
>
> [...]
>
> The code generated by pyuic4 is designed to be used with an instance of the
> appropriate class, either by calling the setupUi() method with an instance
> or by subclassing the appropriate class and "mixing in" the generated
> class. (See http://doc.trolltech.com/4.1/designer-using-a-component.html
> for more information about each of these methods.)
>
> In your code, you create an instance of the generated user interface class,
> Ui_MainWindow, which contains a call to setCentralWidget(). However, you
> are passing a QDialog instance to its setupUi() method, and this fails
> because QDialog doesn't have a setCentralWidget() method.
>
> > def main(args):
> >
> >     app = QtGui.QApplication(sys.argv)
> >     window = QtGui.QDialog()
>
> [...]
>
> >     ui = mainscreen.Ui_MainWindow()
> >     ui.setupUi(window)
>
> This leads to the following:
> >   File "E:\Documents and
> > Settings\User\Desktop\PxQxAuditor\dialogs\mainscreen.py", line 80, in
> > setupUi
> >     MainWindow.setCentralWidget(self.centralwidget)
> > AttributeError: setCentralWidget
>
> What you meant to do was to create an instance of QMainWindow and pass that
> to setupUi(), as in the following code:
>
> def main(args):
>
>     app = QtGui.QApplication(sys.argv)
>     window = QtGui.QMainWindow()
>
>     ui = mainscreen.Ui_MainWindow()
>     ui.setupUi(window)
>
>     window.show()
>     sys.exit(app.exec_())
>
> Hope this helps,
>
> David
>
> _______________________________________________
> PyKDE mailing list    PyKDE at mats.imk.fraunhofer.de
> http://mats.imk.fraunhofer.de/mailman/listinfo/pykde


Thanks for replying :) I just about worked it out but it took most of the day 
and a couple of headache pills. Strange how the simplest thing ... 

Anyhow seems to me that there is quite a shift between QT3 and QT4 and I am 
bound to hit more problems ... Thanks once again

Dave