[Qt-interest] class composition & communication in Qt

[Kustaa Nyholm]

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Kustaa Nyholm
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> From: Markus Franke <Franke.M at sebakmt.com>
> Date: Thu, 30 Sep 2010 14:40:23 +0300
> To: pmqt71 <pmqt71 at gmail.com>
> Cc: <qt-interest at trolltech.com>
> Conversation: [Qt-interest] class composition & communication in Qt
> Subject: Re: [Qt-interest] class composition & communication in Qt
> 
> 
> 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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> 
> 
> 
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