[Solved]QTreeView based on MVC Pattern

[Peggy]

Hello everyone,

I read some articles about MVC, better to say MV, design pattern in Qt and used the Simple Tree Model example which is existed as an example in Qt_Examples in my program.

My proram is a MainWindow with different parts and functions. I put the Tree in the QTabWidget:
@
QTabWidget tabWidget = new QTabWidget;
tabWidget->addTab(new GeneralTab(), tr("General"));

//The writen code in GeneralTab class
QFile file(":/default.txt");
file.open(QIODevice::ReadOnly);
TreeModel model(file.readAll());
file.close();

QTreeView* treeView = new QTreeView;
treeView->setModel(&model);

QVBoxLayout* treeLayout = new QVBoxLayout;
treeLayout->addWidget(treeView);

 setLayout( treeLayout);

@

The problem is nothing will be showen, in my tab!!! even no error message!

I am looking forward to the suggestions esp. solutions:)

[giesbert]

Hi,

your model is a stack variable, which means, it will be deleted on method end.
Make it a heap object created with new :-)

[andre]

Don't worry, it's a classic mistake :-)

[Peggy]

Thank you. It works now:)