[Qt-interest] Derived custom widgets

[Neville Dastur]

> 1) I am using a fudge factor of 24 to account for the combobox drop down
>
> arrow button. I can't find a pixel metric for it. Is there a better way
> of getting the width
>    
> Its part of the style.  I cant remember off the top of my head, but
> there is an enum that you can query the style for to get its pixel width
> for combo boxes
>
>    
Amongst all the QStyle::PM_... enum values 
(http://doc.qt.nokia.com/4.6/qstyle.html#PixelMetric-enum) I can't find 
one that relates
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