Re: maintaining both gtk2 and 3 compatibility

["Jasper St. Pierre" <jstpierre mecheye net>]

On Wed, Nov 9, 2011 at 1:24 PM, Curtis C. Hovey <sinzui is verizon net> wrote:
> Hi Richard.
>
> On 11/09/2011 11:54 AM, Richard Henwood wrote:
>> Is it feasible to keep backward compatibility with gtk2 (gnome2) or should I rip out all the wnck2 packages (below) and maintain two separate code trees?
>
>> richard@wc-hp:~/tools/skype-record$ dpkg -l '*wnck*'
>> Desired=Unknown/Install/Remove/Purge/Hold
>> | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
>> |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
>> ||/ Name               Version            Description
>> +++-==================-==================-====================================================
>> ii  gir1.2-wnck-3.0    3.2.0-0ubuntu1     GObject introspection data for the WNCK library
>> ii  libwnck-3-0        3.2.0-0ubuntu1     Window Navigator Construction Kit - runtime files
>> ii  libwnck-3-common   3.2.0-0ubuntu1     Window Navigator Construction Kit - common files
>> ii  libwnck-3-dev      3.2.0-0ubuntu1     Window Navigator Construction Kit - development file
>> ii  libwnck-common     1:2.30.7-0ubuntu1  Window Navigator Construction Kit - common files
>> un  libwnck-dev        <none>             (no description available)
>> ii  libwnck22          1:2.30.7-0ubuntu1  Window Navigator Construction Kit - runtime files
>> ii  python-wnck        2.32.0-0ubuntu6    Python bindings for the WNCK library
>> un  wncksyncdaemon     <none>             (no description available)
>
> Yes, it is feasible, but it is a burden to maintain. I am maintaining
> two trees for my python projects because the API changes are
> substantial. GTK enums are incompatible, so you may want to trees once
> you are using them.  I reccomend Trunk is gtk3, I backport some changes
> to older gtk2 releases.
>
> I have one case where the API is pretty similar and I decided to delay
> the split. You can alias your imports so that most of the code thinks it
> is working with GTK3.
>
> try:
>    from gi.repository import GObject
>    from gi.repository import Gtk
>    from gi.repository import WebKit
> except ImportError:
>    import pygtk
>    pygtk.require("2.0")
>    import glib as GObject
>    import gtk as Gtk
>    import webkit as WebKit

import glib as GObject?

> You may also need to check for cases of API change:
> # Check for available API, avoid hasattr because it
> # swallows keyboard and system interrupts.
> method = getattr(thing, 'method_name', None)
> if method is not None:
>    method(arg1)
>
>
> --
>
> __C U R T I S  C.  H O V E Y_______
> Guilty of stealing everything I am.
>
>
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>



-- 
  Jasper