[Qt-interest] Fwd: QMainWindow centralWidget issue..

[Nikos Gerontidis]

---------- Forwarded message ----------
From: Andre Somers <andre at familiesomers.nl>
Date: Fri, Jan 29, 2010 at 11:56 AM
Subject: Re: [Qt-interest] QMainWindow centralWidget issue..
To: Qt-interest <qt-interest at trolltech.com>


Nikos Gerontidis wrote:
> Hi list,
>
> I create 2 widgets and /append/ them in a /QList/ object,
How? I hope you're creating them on the heap, right? Not on the stack?
> which is a member of
> my /CustomMainWindow/ class. While in run time, I set the central widget
> with the /setCentralWidget(QWidget*)/ function. My application crashes
> when I
> set twice the same widget as a central widget.
>
> Is it a problem related to the fact that QMainWindow takes ownership
> of the widget, when this widget is being set as a central widget.
> Any ideas? Thanks in advance.
Are you sure your widget still exists when you set it again? Put a
breakpoint in the destructor of your widget, or generate some debut
output there to check.

The question is of course, why are you changing what widget is the
central widget in the first place? Would a QStackedWidget not be a
better candidate to manage what's visisble in your application?

André


Thank you for your instant responses..
Before setting a new widget in the *on_setNewWidget *function
I check if pWidget is NULL with
*QWidget *pWidget = listOfCentralWidgets.at(0); // this is the list containg
the cetral* widgets
*if (pWidget)
    setCentralWidget(pointerToAnotherWidget);*
the if statement passes normally and then the application crashes..
It is strange at the moment. I ll debug it and check it better.

I will use the QStackedWidget, which I believe is a solution to my issue.

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-- 
Best Regards
Nikos Gerontidis
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