Re: Unsupportable ATK interfaces??

[Peter Korn <peter korn sun com>]

Hi Padraig,

> This suggestion is different from Peter's in a later email which proposes, in
> essence, that the ATK interface should fail silently (and hopefully 
> gracefully) if an implementation is not provided.
> 
> Marc proposes somthing more ambitious, i.e. that we attempt to tell the caller
> that the interface is not supported. Do we need to do this?

I don't have a strong opinion on this.  The contract needs to be clear, and the
failures obvious.  There is not a whole lot of difference between:

  if ((result = someAtkCall()) == false) {
    return;
  }

and

  if ((result = someAtkCall()) == (void *) 0) {
    return;
  }

Now, if we want to make the return values ints, and have a set of error
conditions that's quite another matter...


Peter

> > Delivered-To: gnome-accessibility-list gnome org
> > X-Sender: mm128299 bes central sun com
> > To: Niall Power - Sun Microsystems Ireland - Desktop Engineer
> <Niall Power Sun COM>, gnome-accessibility-list gnome org
> > Subject: Re: Unsupportable ATK interfaces??
> > Mime-Version: 1.0
> > X-BeenThere: gnome-accessibility-list gnome org
> > X-Loop: gnome-accessibility-list gnome org
> > X-Mailman-Version: 2.0beta5
> > List-Id: GNOME accessibility development <gnome-accessibility-list.gnome.org>
> >
> > I notice that some ATK functions have a void return type.  Should we ensure
> > that all methods return at least a boolean so that we can return an nerror
> > code for unsupported methods?
> >
> > Marc
> >
> > At 03:15 PM 5/23/2001 +0100, Niall Power - Sun Microsystems Ireland -
> > Desktop Engineer wrote:
> > >Does anyone know or have any suggestions on how to
> > >deal with ATK interfaces that cannot be implemented
> > >in the underlying toolkit?
> > >e.g GailCList implements the AtkSelection and AtkTable
> > >interfaces but there are several attributes to AtkTable
> > >that are not applicable to a GtlClist widget:
> > >is_column_selected();
> > >get_selected_columns();
> > >get_column_extent_at();
> > >
> > >These are just a few examples.
> > >
> > >Thanks,
> > >
> > >Niall
> > >
> > >-------------------------------------------
> > >  <O       Niall Power
> > >  ( \      Sun Microsystems Ltd - Ireland
> > >   X       Desktop Engineer. +353-1-8199097
> > >8===D     niall power ireland sun com
> > >-------------------------------------------
> > >
> > >
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