Problem with MDI framework

[a_m_mukul]

Hi,

I have created one application as like follow:



MainWindow::MainWindow() : QMainWindow()
{
QWorkspace* workspace = new QWorkspace(this);
setCentralWidget(workspace);
workspace->setScrollBarsEnabled(true);

QGraphicsView* view = new QGraphicsView(workspace);
workspace->addWindow(view);
view->showMaximized();
workspace->setActiveWindow(view);

}

Whenever I am minimizing and then restoring the QGraphicsView window,
I am getting following message:

"QCoreApplication:: postEvent: Unexpected null receiver"

Please can any body tell me why this message might be coming.

I am working on Qt4.2.2 and Fedora core-5 application.

[jacek]

QGraphicsView* view = new QGraphicsView(workspace);
workspace->addWindow(graphicsView);
graphicsView->showMaximized();
workspace->setActiveWindow(m_graphicsView);
It seems that you have three graphics views (view, graphicsView and m_graphicsView) instead of one.

[steg90]

Just a point to remember, if you upgrade to Qt4.3, there is better support for MDI using QMdiArea which I believe is a replacement for QWorkspace.

Example :



m_pworkspace = new QMdiArea;
m_pCanView = new CanView( this );
m_pworkspace->addSubWindow( m_pCanView );
m_pCanView->show();



Regards,
Steve

[a_m_mukul]

it was a typo in demo program, actually i have only one graphicsView

[jacek]

Try creating the workspace and the graphics view without specifing their parents.

[a_m_mukul]

I tried but didn't work....i have tried all type of combination of specifying/not-specifying the parents.

[jacek]

Does it occur if you use Qt 4.2.3?

[jpn]

I'd like to see and test something compilable that reproduces the problem.