KComboBox in designer WAS Re: kartesio

[Orestes Mas]

El Dimecres, 8 de maig de 2013, en/na Albert Astals Cid va escriure: 
> El Dimecres, 8 de maig de 2013, a les 14:18:43, Orestes Mas va escriure:
> > To fix it it's enough to use a KComboBox in designer, but the point is I
> > cannot do that because I want this combo act as an own-derived class
> > (myaudiocombo) and to do that I've to *promote* the standard combo in
> > designer to my combo class, but designer only allows me to promote Qt
> > classes, not KDE ones.
> > 
> > Do you know which is the proper way to handle this (pretty common, I
> > presume) situation?
> 
> My suggestion, don't inherit from Q/KComboBox, don't think you really need
> it.
> 
> I've looked at your class the only think i can see is you hijacking the
> polish event, but you can totally do that with an eventFilter if you need
> to. The rest just seems like would totally work with "have a KComboBox"
> instead of "is a KComboBox".
> 

My reasoning was: I've a ComboBox letting user choose between ALSA or 
PulseAudio sound systems. If user changes current combo selection, I want a 
second combo (the one we are speaking of) to ask gstreamer for a list of audio 
devices in the new selected sound system, and to fill itself with these values.

As this operation requires a bit more intelligence than a standard combo, my 
idea was to derive a class implementing the suitable functionality.

So, if I understand you correctly, your advice is to transfer all this 
behaviour from my custom combo to the class containing it, am I right? For 
instance, let the widget containing the combo (in my cas is a customized 
settings dialog) detect changes in the first combo and updating the second one 
accordingly.

Would you reccomend this? This will certainly solve the problem, but on that I 
should object that having some more widgets with similar needs on the same 
dialog would lead to long source file for the dialog class. I'd like to keep 
source files manageable, but if there's no other solution...

-- 
Orestes Mas.