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Re: Gtk scrollbar: thumb too short


From: Owen Taylor
Subject: Re: Gtk scrollbar: thumb too short
Date: 07 Apr 2003 14:57:02 -0400

On Mon, 2003-04-07 at 14:38, 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.

Regards,
                                               Owen








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