[Qt-interest] Event Filter

[Atlant Schmidt]

Phil:

  If it were my design, I'd catch the valueChanged signal,
  coerce the value to the "nearest 5", and setValue on the
  spin box, taking care that I don't get stuck in a loop
  of valueChanged signals.

  This lets the user use the keyboard but forces the values
  to be as you want them *AND* gives the user immediate
  visual feedback that you're looking for a "nearest 5"
  sort of value.

                        Atlant

-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of phil prentice
Sent: Wednesday, August 11, 2010 12:01 PM
To: qt-interest at trolltech.com
Subject: [Qt-interest] Event Filter

Hi

  I've been using QT for many years now, but I still consider myself a bit of
a novice.  I am wondering if its better(more efficient) to use an
event-filter or to sub-class widgets and catch events that way.

  Basically I have an integer spin-box which increments in blocks of 5.  Only
5,10,15,....are valid inputs.  I dont want the user to be able to type in 6
or 7 etc.  I dont know what the standard method is to do this, but my
thinking is that the user should only be allowed to use the up&down arrows
and keys to drive it.  So I thought that I might just stop keyboard numeric
input.  I could sub-class or use an event filter.  Which would be best?

  Secondly I have some other sub-classed frame objects that I need to detect
if the mouse has been selected inside of them.  I could use the
mousePressEvent() for those objects
or
I could again use the same event-filter (especially if I already have one
available from above), but this time catching mouse events.  If I did'nt have
the event-filter from above I would probably stick with the
mousePressEvent().

What would you all recommend?

Thanks for any suggestions
Phil
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