Hi, On Wed, May 22, 2002 at 05:27:49PM -0700, Dave Close wrote: > It is possible to define a backend option as SANE_CAP_SOFT_DETECT only. > Such options are essentially read-only information sources for a frontend. > Xsane reads the value of such an option and displays it in a grayed-out > form. That seems natural and correct to me. > > But the value of such an option may change over time. Is there any way to > cause Xsane to re-read the option and display the new value? Preferably, > without having to initiate a scan or other physical action?
In sane_control_option, you can set *info = SANE_INFO_RELOAD_OPTIONS whenever any option is set or read. If your value can change even if no other option is changed, the user must force a reload by pressing is button (option type SANE_TYPE_BUTTON). The backend can set SANE_INFO_RELOAD_OPTIONS when this option is set. Bye, Henning
