Re: Scrollbars.

[Richard Frith-Macdonald]

On 16 Nov 2006, at 19:28, Vaisburd, Haim wrote:

> Marc Brünink wrote:
>
> > Chris Vetter wrote:
> > > or maybe better (IMHO) use it's own User Default,
>
> > If we want good support of themes, this should get its own
> > default. But this is a fundamental decision. Do you want lots of
> > defaults or do you want to be spare. The first case clutters up  
> > the code
> > and the documentation, but allows everyone to configure everything.
> > The second one is easier to use, but isn't as powerful.
> > [...] I advocate for A.
>
> I understand it as
>   (A) 1-step: configure everything right away
>   (B) 2-step: select from pre-defined themes, themes are created  
> elsewhere.
>
> Then I advocate for B - it's easier to understand, easier to use,  
> and gives
> the same power since user can create his own theme.

Experimentally, I Implemented right hand side scrollbars in the  
'themes' branch in svn,
This is using the NSInterfaceStyle system with the  
NSScrollViewInterfaceStyle key and having either  
NSMacintoshInterfaceStyle or NSWindows95InterfaceStyle use scrollers  
on the right and other interface styles use scrollers on the left.
So this can be controlled either by a theme or directly by setting  
the NSScrollViewInterfaceStyle user default.

Reading this thread there seems to be some confusion/misapprehension  
about what NSInterfaceStyle does.
In fact tt allows a global style to be set but also allows key  
specific settings to override the global style (typically a class  
would ask for the interface style for a particular key) and even  
allows individual controls to be set to a particular style  
irrespective of the style of the rest of the UI (though I have no  
idea what that last feature is really good for).
Generally the interface style in use is set via the user defaults  
system, but a theme can set a collection of defaults values, so that  
the user does not need to remember the inbdividual settings (but can  
still manually override the values the theme has set if they wish).