[Icewing-user] "opts_float_create" and "opts_value_set" precision and gtk

[Christian L. <chr...@un...>]

Dear all,

I have a question about the "opts_float_create" and "opts_value_set" 
functions of iceWing. When "opts_float_create" is used to create a 
slider, the given range for the value seems to determine the precision 
of that value implicitly. In case one uses "opts_value_set" with an 
value of higher precision in terms of post decimal positions, the value 
is truncated to that implicitly given precision by the call to 
"opts_value_set". In addition, gtk produces a beep to indicate that 
issue (this is at least my interpretation of the situation).

I attached a small example which shows the described behavior. It can be 
compiled with "g++ -shared `icewing-config --cflags` -o libTestPlug.so 
TestPlug.cpp" and started by "icewing -l ./libTestPlug.so". When the 
slider is set to a value with two post decimal positions, it is not 
changed by the call to "opts_float_create". But if a value with three 
post decimal postions is used, it is truncated to two post decimal 
positions and the "beep" occurs.

My question is now: How exactly is the precision of the value 
determined? I would like to now this to avoid unintended changes in the 
value and also to avoid the "beep" every time a value with too high 
precision is set.

Thank you very much.

Kind regards,
Christian