Transforming argument from signal to slot

Hi!

I read the signals-and-slots documention already and ask me know if it's 
possible to transform the argument from the signal-function to the 
slot-function. I didn't find anything yet.

One Example:

I create a select-element

<select name="foo">
   <option value="hotel">hotel</option>
   <option value="plane">plane</option>
   <option value="car">car</option>
</select>

and I create a Layer which should also be only visible if "car" is selected.

Both elements are single objects which don't know anything from each 
other. The select-element has a property "selection" which set/get the 
current selection. The Layer has a property "display", which is equal to 
the so named css-property. My simple thought was that I am able to 
connect the "setSelection" function to the "setDisplay" function and 
transform the value on the way:

selection:
hotel       => none
plane       => none
car         => block

Is something like this possible or planned? Some mapping of values or 
real transformation (math, ...).

Many thanks and best regards,

Sebastian Werner

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