Trolltech Home | Qt-interest Home | Recent Threads | All Threads | Author | Date
All threads index page 5

Qt-interest Archive, May 2007
Qt layout Q.

Message 1 in thread

Hello, everybody.

I've just encountered a problem and can't find a quick and easy solution (Qt 4.2.3/Win32)

Short description:
I have QWidget *w, already populated with nested child controls and layouts.

I want to insert MyCoolWidget *cw in top part of widget w (of course,
this required new v-box layout for w, managing cw and "old" layout).

Unfortunatelly, i can't do this in a simple manner:

        QVBoxLayout *nl = new QVBoxLayout;
        nl->setMargin(0);
        nl->setSpacing(0);
        nl->addWidget( cw );
        QLayout *cl = w->layout();

        QLayout *ll = 0;
        if ( cl->inherits( "QVBoxLayout" ) )
                ll = new QVBoxLayout;
        else if ( cl->inherits( "QHBoxLayout" ) )
                ll = new QHBoxLayout;
        else
                Q_ASSERT( false );

        ll->setMargin( cl->margin() );
        ll->setSpacing( cl->spacing() );
        while ( cl->count() > 0 )
        {
                QLayoutItem *li = cl->takeAt(0);
                ll->addItem( li );
                qDebug( "Transfer layout item %p\n", li );
        }
        Q_ASSERT( cl->count() == 0 );
        nl->addItem( ll );

        delete cl;

        w->setLayout( nl );

This code crashes at last line (setting new layout)
Call stack:

G2.exe!QLayoutPrivate::reparentChildWidgets(QWidget * mw=0x0012fcdc)  Line 747 + 0xb    C++
G2.exe!QLayoutPrivate::reparentChildWidgets(QWidget * mw=0x0012fcdc)  Line 760  C++
G2.exe!QWidget::setLayout(QLayout * l=0x01401a50)  Line 6936    C++

Any suggestions?

-- 
 [ signature omitted ]