[Qt-interest] class composition & communication in Qt

[Markus Franke]

Hi pm,

a signal-slot connection is in most cases the best solution as it provides 
a loose coupling between the parent and the child widget.

You should not use parentWidget() in a child widget (including a 
corresponding cast) and expect to get what you want. 
This would force the child widget always to be used within the same parent 
widget.

Hope this helps,
Markus


qt-interest-bounces at trolltech.com schrieb am 29.09.2010 16:48:05:

> Hi all,
>  
> I have a MainWindow and a widget member class.
>  
> The widget,  while painting, needs information from MainWindow. So what 
> is the best way to access information from the member class to the 
> holding class? Is there an usual pattern in Qt or GOF for this problem?
>  
> thanks
> pm
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