To: alan.schmitt at inria.fr
Cc: lablgtk at kaba.or.jp
Subject: Re: setting the "upper" value of an adjustment
In-Reply-To: <20011209180210.A11954 at alan-schm1p>
References: <20011209180210.A11954 at alan-schm1p>
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Message-Id: <20011210151319H.garrigue at kurims.kyoto-u.ac.jp>
Date: Mon, 10 Dec 2001 15:13:19 +0900
From: Jacques Garrigue <garrigue at kurims.kyoto-u.ac.jp>
Lines: 27

From: Alan Schmitt <alan.schmitt@inria.fr>

> I'm still converting my old GTK program, and I'm trying to deal with
> this code:
>   GTK_ADJUSTMENT(delay_adjustment) -> upper = minutes_span;
> which basically modifies the "upper" field of an adjustment.

I have a strong feeling that it is not a good thing to do.
What if you end up with "value" being greater than "upper"?

Except special cases, you're not supposed to modify directly the
members of a gtk object.

> So I'm wondering if this is possible with lablgtk (looking at gData.mli,
> it does not seem possible), or if the only choice consists of creating a
> new adjustment (and thanking the GC for not having to deal with the old
> one ;-)

Since there is no function to change the bounds of an adjustment in in
GTK+ itself, this would seem to be the right thing to do.

Yet, this doesn't seem that clear: the documentation says that this is
OK for the owner of an adjustment to change the bounds, then calling
the "changed" signal. Does it mean that I should add a set_bounds
functions, eventhough there is no such thing in GTK+ ?

Jacques