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Re: Gtk scrollbar: thumb too short
From: |
Stefan Monnier |
Subject: |
Re: Gtk scrollbar: thumb too short |
Date: |
Mon, 07 Apr 2003 12:57:02 -0400 |
> > > 3. Make the GTK scrollbar more customizable so that it can optionally
> > > handle a character based approach and hence behave, within Emacs,
> > > more like the native scrollbar than the pixel based variant of the
> > > GTK scrollbar.
> >
> > I think this is the only reasonable solution.
> >
> > I agree with Miles--this is the only right way.
> >
> > Owen, would you please implement this facility in the GTK scroll bar?
>
> I don't think there has been a satisfactory explanation of how you
> are going to deal with minimum size issues; which for some themes
> occur on quite moderately sized buffers. (As I said earlier, for
> Red Hat's default theme, the minimum scrollbar thumb size is
> ~30 pixels)
IIUC, the scrollbar widget has the following:
total-size
minimum thumb size
thumb size
thumb position
Where minimum-thumb-size is (for all intents and purposes here) a constant.
Let's simplify things and subtract minimum thumb size from the current
thumb size and from the total, we get:
total-size
thumb size
thumb position
where
0 <= thumb-size <= total-size
thumb-size + thumb-position <= total-size
What we need is that when the mouse is moved such that
thumb-size+thumb-position would become larger than total-size,
[the scrollbar should behave as if] thumb-size is reduced to
total-size - thumb-position.
> I also am not convinced that the behavior is right from the point of
> view of a user; the ends of the scrollbar should be the ends
> of the scrollbar.
Total agreement ;-) : the user shouldn't be prevented from moving the
thumb-position to the end (i.e. to toal-size) just because the thumb-size
is currently non-zero.
> However, I was reminded this morning that a facility that allows
> you to implement your desired behavior was actually added prior
> to GTK+-2.2.
>
> If you connect to the "adjust_bounds" signal on GtkRange (the
> base class for GtkScrollbar), this gives you the chance, when
> the user clicks the arrows or drags the thumb, to adjust
> the bounds and/or page size *before* GTK+ clamps the position.
>
> So, it should be pretty trivial to make the thumb shrink as the
> user drags past the end position of the scrollbar.
That sounds like it might indeed do the trick.
Stefan
- Re: Gtk scrollbar: thumb too short, (continued)
- Re: Gtk scrollbar: thumb too short, Miles Bader, 2003/04/01
- Re: Gtk scrollbar: thumb too short, Luc Teirlinck, 2003/04/01
- Re: Gtk scrollbar: thumb too short, Miles Bader, 2003/04/01
- Re: Gtk scrollbar: thumb too short, Kai Großjohann, 2003/04/02
- Re: Gtk scrollbar: thumb too short, Luc Teirlinck, 2003/04/02
- Re: Gtk scrollbar: thumb too short, Kai Großjohann, 2003/04/02
- Re: Gtk scrollbar: thumb too short, Luc Teirlinck, 2003/04/02
- Re: Gtk scrollbar: thumb too short, Kai Großjohann, 2003/04/02
- Re: Gtk scrollbar: thumb too short, Richard Stallman, 2003/04/03
- Re: Gtk scrollbar: thumb too short, Owen Taylor, 2003/04/07
- Re: Gtk scrollbar: thumb too short,
Stefan Monnier <=
- Re: Gtk scrollbar: thumb too short, Owen Taylor, 2003/04/07
- Re: Gtk scrollbar: thumb too short, Stefan Monnier, 2003/04/07
- Re: Gtk scrollbar: thumb too short, Owen Taylor, 2003/04/07
- Re: Gtk scrollbar: thumb too short, Stefan Monnier, 2003/04/07
- Re: Gtk scrollbar: thumb too short, Owen Taylor, 2003/04/07
- Re: Gtk scrollbar: thumb too short, Stefan Monnier, 2003/04/07
- Re: Gtk scrollbar: thumb too short, Richard Stallman, 2003/04/07
- Re: Gtk scrollbar: thumb too short, Owen Taylor, 2003/04/08
- Re: Gtk scrollbar: thumb too short, Miles Bader, 2003/04/08
- Re: Gtk scrollbar: thumb too short, Richard Stallman, 2003/04/08