About XfconfChannel Object (Brian J. Tarricone)

[ali abdallah]

>
> Message: 2
> Date: Sun, 21 Sep 2008 10:20:47 -0700
> From: "Brian J. Tarricone" <bjt23 at cornell.edu>
> Subject: Re: About XfconfChannel Object (Brian J. Tarricone)
> To: xfce4-dev at xfce.org
> Message-ID: <20080921102047.5d688b68 at kepler>
> Content-Type: text/plain; charset=US-ASCII
>
>
>
> On Sun, 21 Sep 2008 15:37:56 +0200 Stephan Arts wrote:
>
> > On Sun, Sep 21, 2008 at 3:25 PM, ali abdallah
> > <ali.slackware at gmail.com> wrote:
> > >
> > >
> > >> Message: 4
> > >> Date: Sat, 20 Sep 2008 15:54:10 -0700
> > >> From: "Brian J. Tarricone" <bjt23 at cornell.edu>
> > >> Subject: Re: About XfconfChannel Object (Brian J. Tarricone)
> > >> To: xfce4-dev at xfce.org
> > >> Message-ID: <20080920155410.1cd9a786 at kepler>
> > >> Content-Type: text/plain; charset=US-ASCII
> > >>
> > >> On Sat, 20 Sep 2008 23:07:11 +0200 ali abdallah wrote:
> > >>
> > >> > > On Sat, 20 Sep 2008 13:42:12 +0200 ali abdallah wrote:
> > >> > >
> > >> > > > On Sat, Sep 20, 2008 at 12:32 PM, Brian Tarricone wrote:
> > >> > > > > ali abdallah wrote:
> > >> > > > > > Hi,
> > >> > > > > >
> > >> > > > > > Why the XfconfChannel and XfconfChannelClass are defined
> > >> > > > > > in the xfconf-channel.c, i'm asking this question since i
> > >> > > > > > couldn't derive an object
> > >> > > > > > from the XfconfChannel object!
> > >> > > > >
> > >> > > > > Er, why do you want to?  I assumed no one would.
> > >> > > > >
> > >> > > > > Not saying you don't have a valid use-case, but I'd rather
> > >> > > > > not go and change things without a reason.
> > >> > > > >
> > >> > > > I wanted to have an object wish is derived from XfconfChannel
> > >> > > > object and contains more data and functions to be used in my
> > >> > > > application, then i can call the *channel_get* and
> > >> > > > *channel_set* functions by casting the object to
> > >> > > > XfconfChannel type, just like a GtkWidget and GtkButton for
> > >> > > > example.
> > >> > >
> > >> > > So are you actually *extending* the XfconfChannel type?  I
> > >> > > mean, are you actually adding settings-related functionality
> > >> > > to it, or are you just using subclassing as a quick-and-dirty
> > >> > > shortcut to avoid having to carry around an extra pointer?
> > >> > >
> > >> > > If you're actually extending the object, I'd consider making
> > >> > > the class struct public, but otherwise you should just be using
> > >> > > g_object_set_data() to carry around a pointer to the
> > >> > > XfconfChannel, or stuffing it in a struct that has other data
> > >> > > you're passing around.
> > >> > >
> > >> >
> > >> > Yes actually i'm extending the object and i want to add some
> > >> > functions to it, it's not really
> > >> > mandatory since the second solution that you are proposing is
> > >> > always valid, but well having to work
> > >> > with the GObject system for a long time now, i thought it is
> > >> > kind of standard the
> > >> > declaration of the GObjects.
> > >>
> > >> What kind of functions do you want to add?  If you want to add
> > >> normal functions that operate on an XfconfChannel object, you
> > >> don't need to subclass it.  If you want to add *virtual* functions
> > >> to XfconfChannelClass (or rather, subclass it and add vfuncs),
> > >> then yeah, you need to subclass, but I can't think of a reason why
> > >> you need to.
> > >>
> > >> Really, I'm perfectly willing to make the XfconfChannel and
> > >> XfconfChannelClass structs public, and if you have a good use case,
> > >> please do let me know.  This is the perfect time to do it, before
> > >> we have a 'real' release of the library... if there's good reason.
> > >
> > > Well, my idea was to have let's say a conf object derived from the
> > > XfconfChannel object,
> > > and has a callbacks for "property-changed" with the property and
> > > the new value.
> > > i simply didn't want to have the XfconfChannel object in the
> > > private data of the conf
> > > object, since from outside to call *channel_set* and *channel_get*
> > > i have to provide
> > > the XfconfChannel and i don't like to have anything in the conf
> > > public struct
> > > other than the parent and priv.
> > >
> >
> > just to be clear on this: you have heard of xfconf's bind functions,
> > right?!
>
> And... you do know about the property-changed signal on XfconfChannel,
> right?
>
>        -brian
>
>
Yes yes, sure i know about the property-changed signal, i read already the
xfconf reference manual
my example wasn't clear, in fact i have a property if changed another
property should be changed with
respet to it, so when the property-changed signal is emitted on the
XfconfChannel i get the GValue of the callback argument
then i calculate what the second property should be store it and emit a
signal ( conf-property-changed for example ).
anyway i believe i was complicating my life i'm writing already the
application and using XfconfChannel
without subclassing, there is always more than one way to get something
done.

Many thanks,
Best Regards,
Ali.
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