Negative number

[MariaJsn]

I want to start my slider from -100 to 100.
I can set the -100 on slider but when I try to slide bubble not show negative numbers.
Is it possible to work with negative numbers?

[pirogman]

the fraction goes from 0.0 to 1.0, so you can just say your resulting value = fraction * 200 - 100 and have a needed display range