Re: [matplotlib-devel] Backend for Pyside

[Gerald S. <gd...@mr...>]

It turns out that it was also trivial to get the figure options editor 
working with PySide.

All that needed to be done was (in formlayout.py):

    * Replace the references to PyQt with PySide
    * Change: from PyQt.QtCore import (Qt, SIGNAL, SLOT, QSize, QString,
                                 pyqtSignature, pyqtProperty)
      to: from PySide.QtCore import (Qt, SIGNAL, SLOT, QSize, #QString,
                                 #pyqtSignature, pyqtProperty)
                                  Slot as pyqtSignature, Property as
      pyqtProperty)
    * Add the following after the import statements:
      # Hacks to emulate PyQt
      QString = str
      class QColorDialog(QColorDialog):
           @staticmethod
           def getRgba(color,parent):
               result =
      QColorDialog.getColor(QColor.fromRgba(color),parent,'')
               return result.rgba(),result.isValid()

Formlayout could probably be updated so it doesn't need the hacks but I 
wanted to keep changes to a minimum.

Gerald.

On 17/03/2011 11:21 AM, Gerald Storer wrote:
> On 01/18/2011 08:13 PM, Jed Ludlow wrote:
> > Please forgive me if I'm raising a heretical question with this since I
> > understand the topic of competing Qt bindings for Python gets a little
> > touchy in and of itself. Nonetheless, the elephant is in the room. I
> > searched the archives and found only a few comments on the subject:
> > mat...@li.../msg18652.html" 
> target="_new">http://www.mail-archive.com/mat...@li.../msg18652.html>
> > Has there been any additional discussion among the developers about
> > creating a formal backend for Pyside?
>
> Its actually a fairly easy to get the PyQt backend working with 
> PySide.  It would have been laughably easy if not for a couple of bugs 
> in PySide that took awhile to track down.
>
> To get it working PySide working you need to:
>
>     * Obviously replace the reference to PyQt with PySide
>     * Remove the reference to PyQt/Pyside.Qt and Qt.qApp by replacing
>       it with QtGui.qApp (I think this is already done in the most
>       recent Git version)
>     * Replace the toolbar message signal with a new style signal by:
>           o adding 'message = QtCore.Signal(str)' to the
>             NavigationToolbar2QT class definition
>           o replacing: QtCore.QObject.connect(self.toolbar,
>             QtCore.SIGNAL("message"),
>                                              
>             self.window.statusBar().showMessage)
>             with:self.toolbar.message.connect(self.window.statusBar().showMessage)
>           o replacing: self.emit(QtCore.SIGNAL("message"), s)
>             with: self.message.emit(s)
>     * Work around the PySide bug with QImage and convert the string
>       passed from the Agg backend into a python buffer with
>       buffer(stringBuffer) or wait for PySide to fix bug 489.
>     * Work around a PySide bug (738) by creating functions to perform
>       the slider.setMaxiumum/setMinimum tasks or ignore the runtime
>       errors for now and wait for a bug fix.
>     * I haven't bothered with the figure options editor at this point
>       - I just commented out the references to it.
>
> It might also be a good idea to convert all the signals/slots into the 
> new style but it seems to work just fine with only the above changes.
>
> Regards,
> Gerald.