[sane-devel] Scanner buttons (kind of RFC)

[mh]

Hi,
would it be possible, to add an option called "button-state" to saneopts.h ? 
"button-state" is an option of SANE_TYPE_INT with SANE_UNIT_NONE and 
SANE_CONSTRAINT_NONE and capability SANE_CAP_SOFT_DETECT (i.e. a read-only 
option).

If a frontend detects such an option, it can use a timer to query the option 
value repeatedly. The possible return value is one of the following values:

#define SANE_BUTTON_STATE_NONE  0
#define SANE_BUTTON_STATE_SCAN  1
#define SANE_BUTTON_STATE_OCR   2
#define SANE_BUTTON_STATE_EMAIL 3
#define SANE_BUTTON_STATE_COPY  4
...<and others if required>

Or is there a better/an easier way to make the scanner buttons work? (Or is 
this already possible, and I'm just missing something :-/)

Comments please :-)

bb
Michael