Store GtkRadioButtonGroup "value" in GSettings

[Geert Janssens <info kobaltwit be>]

I'm in the process of converting GnuCash from GConf to GSettings.

I found the g_settings_bind to be an invaluable convenience function to bind checkboxes, 
spinbuttons and entries to gsettings values. This function has reduced a lot of our Gconf glue 
code.

I am looking at doing something similar for our gtkradiobuttons, but I have some difficulties in 
finding the most elegant way to go about it.

At present we have defined one gconf setting per radio group. So if we have three 
radiobuttons "Foo","Bar" and "Baz" in one radio group called "FooGroup", there is one 
associated Gconf setting named "FooGroup", which can have a value of "Foo","Bar" or "Baz". 
Obviously, with this configuration I don't have one single object property to bind to so that 
g_settings_bind can do its magic.

Searching for gsettings gtkradiobutton or variants doesn't turn up much information on this.

So how should this be set up ? Is it possible to keep one gsettings parameter to work for three 
radio buttons ? Or should I go for 3 gsettings parameters to match on on one with the radio 
buttons ?

The latter option will certainly make it more difficult to migrate settings from the old gconf 
database to the new gsettings backend.

Geert