[sane-devel] scanner buttons

[m. allan noah]

> > > i think we need a polling capability, though that would mean changes to
> > > front-ends....
> > 
> > Yes I also think so! We should add this to the current stuff!
> > I also think we need some callback stuff for warmup notification.
> 
> Hm - maybe callback stuff are too much changes for 1.x - maybe we
> should finally start working on SANE 2?

can we do callbacks via options? thinking about a gui front-end:

what about an 'led' that is red while the lamp is off, yellow when 
warming, and green when it is hot. this could be done via a read-only 
option that has a polling capability set. the front end could just loop 
thru all the options with poll set, and change the interface. if you gave 
that option a well-known name, like 'lamp-status' then the front-ends 
could do majic things like wait for it to become ready before displaying 
the scan button.

> 
> In my last mail I already wrote that the HP 74xx have buttons to
> change the scan mode and copy count - this are also use cases where
> the "option changed" callbacks come handy.
> 

can you think of a case where a call-back is required? (i want to avoid 
them, if possible.)

allan

> Sincerely yours,
>   René Rebe
>     - ROCK Linux stable release maintainer
> 
> --  
> René Rebe - Europe/Germany/Berlin
>   rene@rocklinux.org rene@rocklinux-consulting.de
> http://www.rocklinux.org http://www.rocklinux-consulting.de
> 
> 
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