[Qt-interest] qspinbox

[phil prentice]

Hi
  I am using some QSpinBoxes in a dialog.  These spinboxes have valid ranges.
Ideally I would like to disable the Ok box if the user has completely deleted 
all the characters in the spinbox.  Although I would be happy to check for 
this case on the Ok slot itself if I cant disable Ok.

  I've tryed all the obvious things like the valueChanged signals etc, but at 
the moment it seems to end up with the last correct value i.e. 
QAbstractSpinBox::CorrectToPreviousValue.
I cant seem to detect that the curent text in the spinbox is null.

Is there any nice way to do this (without deriving from QSpinBox)?

Thanks for your help

Phil