QDockWidget: Debugging crash

[MarkoSan]

Did you insert Q_CHECK_PTR as I said?

[axeljaeger]

I still think that the parent() of the QDockWidget is 0.

[MarkoSan]

So, the code:

m_dockWin =  new QDockWidget("test");

m_dockWin =  new QDockWidget("test");

To copy to clipboard, switch view to plain text mode 

should be:

m_dockWin=new QDockWidget(QString("test"), this);

m_dockWin=new QDockWidget(QString("test"), this);

To copy to clipboard, switch view to plain text mode 

[axeljaeger]

Either this or the dock widgets should be added later using addDockWidget. I think this sets the parent too.

[carsten]

This is the current code, still crashing. As soon as I make the m_dockWin a child of "this" it is *in* the mainwindow. So that cannot be right.

m_dockWin = new QDockWidget("test");
    Q_CHECK_PTR( m_dockWin );
 
    m_toolbox = new QToolBox( this );
    Q_CHECK_PTR( m_toolbox );
 
    m_dockWin->setWidget( m_toolbox );
    m_dockWin->setAllowedAreas( Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea );

m_dockWin = new QDockWidget("test");
    Q_CHECK_PTR( m_dockWin );

    m_toolbox = new QToolBox( this );
    Q_CHECK_PTR( m_toolbox );

    m_dockWin->setWidget( m_toolbox );
    m_dockWin->setAllowedAreas( Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea );

To copy to clipboard, switch view to plain text mode 

I noticed this in the shell when executing Kalzium

QLayout::addChildWidget: QToolBox "" in wrong parent; moved to correct parent

class Kalzium is:

Kalzium::Kalzium()
    : KMainWindow( 0, "Kalzium" )
{

Kalzium::Kalzium()
    : KMainWindow( 0, "Kalzium" )
{

To copy to clipboard, switch view to plain text mode 

I don't know the check-pointer-macro, but I don't see any information in the shell. Is this supposed to help in gdb?

[MarkoSan]

Like axeljaeger said, you should also use addDockWidget().

[carsten]

Ok, I just debugged a little more. The problem seems to be that KMainWindow does *not* inherit from QMainWindow but from Q3MainWindow. And Q3MainWindow doesn't know anything about QDockWidget but only about QDockWindow. Therefore, somewhere in the Q3Compatlib it crashes.
So somebody needs to port KMainWindow of KDE4 first.