Re: [Vala] Genie, subclassing and some help!

[Abderrahim Kitouni <a kitouni gmail com>]

Hi,

2010/6/25 Andrew <rugby471 gmail com>:
> On 25/06/10 09:00, Abderrahim Kitouni wrote:
> > Hi,
> >
> > 2010/6/25 Andrew <rugby471 gmail com>:
> > > Thankyou for your help.
> > >
> > > I tried the first method but it didn't work (it is a Gtk object and so I
> > > doubted it would due to what you said above). I then tried to do the
> > > second method but I didn't really understand what to do.
> > >
> > > Could you do an example with this
> > > http://people.canonical.com/~ted/libappindicator/current/AppIndicator.html#app-indicator-new
> > > ?
> >
> > Take a look at the properties section [1], the "construct only"
> > properties cannot be changed afterwards and so need to be passed to
> > Object(...) if you don't want the default value. The other is
> > icon-name (which becomes icon_name in Vala/Genie).
> >
> > What we notice here is that the "usually" part in my past message
> > doesn't work : category is passed to the creation method as an enum
> > but is stored in the property as a string. I'm not sure how to do the
> > mapping, you may need to look at the source of app_indicator_new
> >
> > HTH,
> > Abderrahim
> >
> > [1] http://people.canonical.com/~ted/libappindicator/current/AppIndicator.html#AppIndicator.properties
>
> Sorry maybe I didn't explain, I am using Genie for the VERY FIRST time
> and so what you are saying doesn't really mean anything to me.
>
> Could you give me an example that I could learn off of?

I assumed you knew a bit of C and GObject to look at the source [1],
you need to do something similar to this function in your construct

(be careful to reindent correctly when copy-pasting)

construct (id: string, icon: string, category: AppIndicatorCategory)
  Object(id: id, icon_name: icon, category: category_from_enum(category))

def category_from_enum (category: AppIndicatorCategory): string
  var categ_cls = (EnumClass) typeof(AppIndicatorCategory).class_ref()
  return categ_class.get_value(category).value_nick

I didn't test this code but it should work.
It's not always that difficult with Genie/Vala (Object(id: id,
icon_name: icon, category: category) should be enough), it's just that
this library is a bit weird (the value is an enum in the constructor
and internally, but is exposed as a string to gobject). I think you
should report this.

HTH,
Abderrahim

[1] 
http://bazaar.launchpad.net/~indicator-applet-developers/indicator-application/trunk/annotate/head:/src/app-indicator.c#L1009