> > > 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 > r...@rocklinux.org r...@rocklinux-consulting.de > http://www.rocklinux.org http://www.rocklinux-consulting.de > > > -- > sane-devel mailing list: sane-devel@lists.alioth.debian.org > http://lists.alioth.debian.org/mailman/listinfo/sane-devel > Unsubscribe: Send mail with subject "unsubscribe your_password" > to sane-devel-requ...@lists.alioth.debian.org > -- "so don't tell us it can't be done, putting down what you don't know. money isn't our god, integrity will free our souls" - Max Cavalera
