show() in central main window

[ufo-vl]

Hello,

QDialog dlg( this );
dlg.show();

QDialog dlg( this );
dlg.show();

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as result dialog window showed in random place,
can I show the dialog in main window central position?

now, for this task I use the following code:

QDialog dlg( this );
moveToCenter( &dlg );
 
void SMainWindow::moveToCenter( QWidget* child )
{
    if ( child->parentWidget( ) )
    {
        QSize szParent = child->parentWidget( )->size( );
        QPoint ptChild = QPoint( ( szParent.width( ) - child->size( ).width( ) ) / 2,
                ( szParent.height( ) - child->size( ).height( ) ) / 2 );
        child->move( ptChild );
    }
}

QDialog dlg( this );
moveToCenter( &dlg );

void SMainWindow::moveToCenter( QWidget* child )
{
    if ( child->parentWidget( ) )
    {
        QSize szParent = child->parentWidget( )->size( );
        QPoint ptChild = QPoint( ( szParent.width( ) - child->size( ).width( ) ) / 2,
                ( szParent.height( ) - child->size( ).height( ) ) / 2 );
        child->move( ptChild );
    }
}

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There are other ways?