Bug#784619: [creepy] Qt4's WebKit removal

[Dmitry Shachnev]

Hi Petter,

On Sun, Aug 07, 2016 at 12:47:57PM +0200, Petter Reinholdtsen wrote:
> Control: tags -1 + help
>
> We belive we will need help with porting creepy to Qt5.
>
> I got a tip on #debian-gis that
> <URL: https://github.com/qgis/QGIS/blob/master/scripts/2to3 > might
> help.  It is a script to migrate python code from Qt4 to Qt5.

No, that is a script to port from Python 2 to Python 3. This is also a
good thing to do, but has nothing to do with Qt.

The biggest difference between PyQt4 and PyQt5 is that the latter only
supports the new-style connect syntax. Fortunately creepy seems to be
already using it, so your work is much less than it could be.

The three main steps then are:

1) There are Python files in creepy/ui/ directory which are generated
   from .ui files using pyuic4. You need to regenerate them using pyuic5
   (available in pyqt5-dev-tools package).

2) There is creepy/components/creepy_resources_compiled.py file which is
   generated from creepy/include/creepy_resources.qrc file using pyrcc4.
   You need to regenerate it using pyrcc5 (the same package).

3) In the remaining files, replace PyQt4 imports with PyQt5. Note that
   the widgets are no longer in QtGui module, but in a separate QtWidgets
   module.

   So you need to do some imports replacing i.e.:

   from PyQt4.QtGui import QWizard →
   from PyQt5.QtWidgets import QWizard

   from PyQt4.QtWebKit import QWebView →
   from PyQt5.QtWebKitWidgets import QWebView

   Alternatively you can just import all modules from PyQt5.Qt, though maybe
   that would slow down the import a bit:

   from PyQt5.Qt import QWizard, QWebView

If something does not work after doing all these steps, please write to me
and I will try to help you.

-- 
Dmitry Shachnev
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