saving/restoring session in kded module

[David Faure]

On Saturday 16 April 2011, Andriy Rysin wrote:
> On 03/05/2011 11:32 AM, Andriy Rysin wrote:
> > There seems to be plenty info on saving/restoring sessions for
> > applications (i.e. the features in KApplication and KMainWindow
> > classes) but I'd like to save/restore some information in KDED module
> > (keyboard layouts to be exact) but only if restore session on login is
> > set to true (I'd like not to introduce another option in keyboard kcm
> > but rather reuse system-wide session handing option).
> > 
> > So far the solution I've found is this:
> > save/restore session in module dtor/ctor checking if in "ksmserverrc"
> > the "loginMode" parameter is set to "restoreSavedSession".
> > This is not very nice as I have to read some other module's config and
> > compare some string values, though I could not find an exposed native
> > or DBUS API from ksmserver. Also I noticed that at least two plasma
> > applets in kde-workspace do exactly that.
> 
> So I've ended up doing something like the code below, but I was
> wandering if we should do this at KDEDModule level, i.e.
> KDEDModule::saveSession()
> KDEDModule::restoreSession()
> which would be overridden if necessary and called if session is to be
> restored so that kded daemons can easily save/restore state, and
> something like
> KDEDModule::getSessionStoreDir()
> to return base directory to store kded module session info so that
> there's some standard location for this and modules don't have to invent
> things.

I like the idea, but we can't add virtual methods to an existing public class 
like KDEDModule, that would be BIC.

This would have to be done with a slot call (invokeMethod).

I don't know if there's a better way than reading ksmserverrc, that's a 
question for Ossi I guess.

But, hmm, to think back about this.... does it really matter if the keyboard 
layout is "the last one the user chose", even when the user said "do not 
restore session on login"? Surely plenty of other configuration options are 
saved by kde applications (e.g. window sizes etc.) and restored the next time 
you run KDE, independently from the "restore session on login" option.
IMHO that options is about re-opening old windows, not about ignoring any 
saved settings.

-- 
David Faure, faure at kde.org, http://www.davidfaure.fr
Sponsored by Nokia to work on KDE, incl. Konqueror (http://www.konqueror.org).