I was wrong in previous emails. All these scrollbars are the full 600
height, so I don't think the ±15 is the issue.
In any case, the documentation is utterly lacking as to what "viewsize"
means. Investigation would likely be punching in different values and seeing
what happens.
Avi
On Tue, Sep 8, 2009 at 2:51 PM, Mark Mentovai <m...@chromium.org> wrote:
> Avi Drissman wrote:
> > Screw #2: The actual scrollbar is drawn just a wee bit shorter. Cocoa
> sizes
> > scrollbar thumbs with a proportion value ([0..1]) while HITheme uses a
> > "viewsize" value related to the physical size of the scrollbar. The
> precise
> > formula Cocoa uses to turn the view size into its proportion value is
> > unknown and would either have to be coaxed out of Apple or
> > reverse-engineered. But even if you could fix both of these screws, you'd
> > have to deal with...
>
> This all sounds reasonable to me. I'd still like to know a little bit
> more about "screw #2" because it seems like something that we should
> understand a bit better before we decide to establish our own
> baselines for these tests.
>
> I wonder what happens when the viewsize or one of the other parameters
> is changed by ±15. Maybe Cocoa is accounting for the "other"
> scrollbar's presence or absence differently.
>
> Mark
>
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