[Qt-interest] remove buttons from a QVBoxLayout

[Tamas Nagy]

Hello,
 
It says QVBoxLayout has no member named takeFirst().
 
I check takeAt(i) for null, but it crashes too.
 
Tamas
 
> --- On Mon, 5/17/10, Rohan McGovern <rohan.mcgovern at NOKIA.COM>
> wrote:
> 
> > From: Rohan McGovern <rohan.mcgovern at NOKIA.COM>
> > Subject: Re: [Qt-interest] remove buttons from a
> QVBoxLayout
> > To: qt-interest at trolltech.com
> > Cc: "ext Tamas Nagy" <ngy_tms at yahoo.com>,
> "william.crocker at analog.com"
> <william.crocker at analog.com>
> > Date: Monday, May 17, 2010, 9:44 AM
> > On Monday 17 May 2010, Rohan McGovern
> > wrote:
> > > On Monday 17 May 2010, ext Tamas Nagy wrote:
> > > > Hello!
> > > >
> > > > It compiles, but it causes segmentation
> fault.
> > > >
> > > > for(int i = 0; i <
> verticalbox->count();
> > i++)
> > > > 
> >
>    verticalbox->takeAt(i)->widget()->setVisible(false);
> > >
> > > That code is wrong... you're removing items from
> the
> > list while
> > > iterating over it.  You want something more
> > like:
> > >
> > > while (verticalbox->count()) {
> > > 
> >    verticalbox->takeFirst()->...
> > > }
> > 
> > I didn't read the next lines of the message where you
> had
> > something 
> > just like this :-)
> > 
> > You also shouldn't use the return value of widget()
> without
> > checking 
> > for 0 first.
> > 
> > -- 
> > Rohan
> > 
> 
> 
> 
>