[Qt-interest] QGridLayout addWidget

[Pradeep K V]

Hi,

This works for me ( Qt 4.6.3 / Windows 7 ):

#include <QApplication>
#include <QGridLayout>
#include <QHash>
#include <QLabel>

class W : public QWidget
{
public:
   W( QWidget* parent = NULL )
       : QWidget( parent )
   {
       for( int i = 0; i < 9; ++i )
           mQHash.insert( i, new QLabel( "Label:" + QString::number(
i + 1 ), this ) );

       QGridLayout* gridLayout = new QGridLayout( this );
       int key = 0;
       for( int i = 0; i < 3; ++i )
           for( int j = 0; j < 3; ++ j )
               gridLayout->addWidget( mQHash.value( key++ ), i, j );
   }

private:
   QHash<int, QWidget*> mQHash;
};

int main( int argc, char* argv[] )
{
   QApplication a( argc, argv );
   W w;
   w.show();
   return a.exec();
}

Regards,
Pradeep K Vijayan

On 29 September 2010 12:48, Leonardo M. Ramé <l.rame at griensu.com> wrote:
> Thanks Alex, indeed, I was using a QHash<int, QMyWidget *>.
>
> Why don't you think it's a good idea to make a QHash? I need a
> collection-like object where I can search items by an identifier, and
> QHash seems to be doing the job.
>
> Anyway, the SigSegv is still there :(.
>
> --
> Leonardo M. Ramé
> http://leonardorame.blogspot.com
>
> On 2010-09-27 18:31:28 -0700, Malyushytsky, Alex wrote:
>> Your code look suspicious.
>>
>> First You can't insert pointer (obtained  from  new QMyWidget() )  into
>> QHash<int, QMyWidget>, second I don't think it is a good idea to make QHash from the QObject.
>>
>> You may try to use QHash<int, QMyWidget*> as a storage.
>> If you already done so find the reason you get SigSegv.
>>
>> Alex
>>
>>
>>
>> -----Original Message-----
>> From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Leonardo M. Ramé
>> Sent: Monday, September 27, 2010 12:12 PM
>> To: Qt Interest
>> Subject: [Qt-interest] QGridLayout addWidget
>>
>> Hi, I'm trying to replace the widget of a "cell" in a QGridLayout,
>> but if I use the code below, I get a SigSegv:
>>
>> myLayout->addWidget(m_widgets.value(0), row, col);
>>
>> m_widgets is a QHash<int, QMyWidget>, where I have inserted one item
>> using insert(0, new QMyWidget()).
>>
>> The layout is a 3x3 grid, so I want to replace the cell (row, col) with
>> a different widget.
>>
>> How can I do this?.
>>
>> --
>> Leonardo M. Ramé
>> http://leonardorame.blogspot.com
>>
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