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Re: Gtk scrollbar: thumb too short
From: |
Owen Taylor |
Subject: |
Re: Gtk scrollbar: thumb too short |
Date: |
07 Apr 2003 15:21:00 -0400 |
On Mon, 2003-04-07 at 15:02, Stefan Monnier wrote:
> > > > > 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
> > > >
> > > > This isn't a "simplification", it is a different algorithm
> > > > from what GTK+ uses. The scrollbar thumb size in GTK+
> > > > is:
> > > >
> > > > MAX (min_size, total_size * document_page_size/document_size)
> > >
> > > [ I assume that total_size = document_size to simplify the discussion ]
> >
> > > So if min_size is 10, total_size is 100 and page_size is 1, how does
> > > the user get to see the last page ?
> >
> > The 0-99 possible values for position in the document are mapped
> > linearly onto the 0-90 possible values for the position of the
> > slider thumb.
>
> My point exactly:
> for all intents and purposes (other than actual drawing on
> the screen which you might care about but we don't), we can
> subtract 10 from all sizes and pretend the total_size is 90
> and minimum_size is 0 (and can thus be ignored).
The difference from your computations and the GTK+ computations
is that GTK+ only subtracts the minimum size from the total
trough size, while you are also subtracting it from the thumb
size.
Regards,
Owen
- Re: Gtk scrollbar: thumb too short, (continued)
- 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, 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,
Owen Taylor <=
- 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
- Re: Gtk scrollbar: thumb too short, Owen Taylor, 2003/04/09
- Re: Gtk scrollbar: thumb too short, Richard Stallman, 2003/04/10
- Re: Gtk scrollbar: thumb too short, Miles Bader, 2003/04/10
- Re: Gtk scrollbar: thumb too short, Richard Stallman, 2003/04/11
- Re: Gtk scrollbar: thumb too short, Jan D., 2003/04/10