Re: saving/restoring session in kded module

[Andriy Rysin]

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.

Regards,
Andriy

bool LayoutMemoryPersister::save(const QString& moduleName)
{
    KConfigGroup c(KSharedConfig::openConfig("ksmserverrc", 
KConfig::NoGlobals), "General");
    kDebug() << "loginMode:" << c.readEntry("loginMode");
    QString loginMode = c.readEntry("loginMode");
    if ( loginMode != "default" && loginMode != "restoreSavedSession" ) 
{    // we don't know how to restore saved session - only previous one
        QString relPath = moduleName + "/keyboard/layout_memory.xml";
        QFile file(KStandardDirs::locateLocal("data", relPath));
        return saveToFile(file);
    }
    return false;
}

bool LayoutMemoryPersister::restore(const QString& moduleName)
{
    KConfigGroup c(KSharedConfig::openConfig("ksmserverrc", 
KConfig::NoGlobals), "General");
    kDebug() << "loginMode:" << c.readEntry("loginMode");
    QString loginMode = c.readEntry("loginMode");
    if ( loginMode != "default" && loginMode != "restoreSavedSession" ) 
{    // we don't know how to restore saved session - only previous one
        QString relPath = moduleName + "/keyboard/layout_memory.xml";
        QFile file(KStandardDirs::locateLocal("data", relPath));
        return restoreFromFile(file);
    }
    return false;
}