Re: Buttons and AtkValue

[Peter Korn <peter korn sun com>]

Hi Padraig,

> Are we saying that Java's implementation of AccessibleValue on AbstractButton 
> is a mistake?
> 
> I have no difficulty removing AtkValue from GaelToggleButton.

More like overkill than a mistake...  I don't think it's a problem, and again, I
think it's necessary for tri-state check boxes.  But I don't see a good argument
for it being on AbstractButton.

Peter

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> > Hi guys,
> >
> > > I agree with Bill here.  I think the semantics of what it means to have a
> > > value are important (I.E., the idea of having multiple values with a min
> > > and max).
> > >   Exposing a button as having this goes against that idea.
> >
> > Let me join you in agreement, mostly...
> >
> > Two state buttons don't need values, and probably shouldn't implement them.  A
> > number of programs implement tri-state check boxes.  Should those be done with
> > AtkValue?  If not, what are the states exposed for such a check box (certainly
> > not "checked" and "unchecked"...).
> >
> > Peter
> >
> > > From: Bill Haneman <bill haneman ireland sun com>
> > > To: "Padraig O'Briain" <Padraig Obriain Sun COM>
> > > Cc: gnom        e-accessibility-list gnome org
> > > Subject: Re: Buttons and AtkValue
> > > Date: Thu, 26 Apr 2001 11:52:32 +0100
> > > Padraig O'Briain wrote:
> > >  >
> > >  > My excuse here is that I am following Java. AccessibleAbstractButton
> > > implements
> > >  > AccessibleValue to set a button to be selected (or not) and get the
> selected
> > >  > state. I propose to follow the same convention for ATK.
> > >
> > > This still seems broken to me.
> > >
> > > For one thing, it complicates life for the AT since it makes it harder
> > > to detect "range controllers" as opposed to just plain
> > > togglebuttons... a range controller with a range of 0 to 1 and no
> > > intermediate values seems like a degenerate case.  OK, a *truly*
> > > degenerate case would have min==max, we ignore that one ;-)
> > >
> > > It also seems totally unnecessary since a combination of get_state and
> > > do_action entirely duplicates the functionality of AtkValue for this
> > > case.  Usually I like to keep consistent with the Java API but this
> > > might be an exception.
> > >
> > > -Bill
> > >
> > >  > My understanding is that "selected" is equivalent to "checked". I think
> > > I lied
> > >  > in my previous statement about not having an action "toggle". A button
> > > has one
> > >  > action which is to click the button which is probably the same as toggle.
> > >  >
> > >  > Padraig
> > >  >
> > >  > >
> > >  > >
> > >  > > >GtkToggleButton Notes:
> > >  > > >The comments on GtkButton and AtkAction interface also apply here;
> > > i.e. one
> > >  > action on a button. I have
> > >  > > >GaelToggleButton implementing AtkValue interface to set the button to
> > >  > > >active or
> > >  > > >not so I do not have an action "toggle".
> > >  > > >
> > >  > > >***
> > >  > > My understanding of AtkValue is that it is for things which can have a
> > >  > > range of values, and that the "checked" state is for objects which only
> > >  > > have two states.
> > >  > > ***
> > >
> > > --
> > > --------------
> > > Bill Haneman
> > > Gnome Accessibility / Batik SVG Toolkit
> > > Sun Microsystems Ireland
> > >
> > > References:
> > > Buttons and AtkValue
> > > From: Padraig O'Briain
> > > [
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