range = lower,upper x = step size up arrow: lower+=x, upper +=x down : lower -= x, upper -= x Just moves range up or down. Changing lower only (either up or down) or upper only (same)?
range = lower,upper
x = step size
up arrow: lower+=x, upper +=x
down : lower -= x, upper -= x
Just moves range up or down.
Changing lower only (either up or down) or upper only (same)?