[Qt-interest] Question on QAbstractItemView::setModel

[Mathieu Malaterre]

Hi there,

  I am discovering Qt, and in particular QtCreator. I created a simple
GUI with a single TreeView (Model-Based) and I am trying to update
it's content. Following instructions from:

http://doc.trolltech.com/4.5/itemviews-simpletreemodel.html

  I have added the different files to the project. However when I
connect (using a slot) I cannot get anything to appear on the
TreeView. I tried adding a simple:

...
ui->label->setText( "hello");
...

  within my slot and it does appear as expected. So in short:
- My push button trigger the event (I can see the string 'hello'
appearing in textlabel object)
- my project compile and run
- I copy directly the source code from:
qt4-x11-4.7.1/examples/itemviews/simpletreemodel

My slot's code is:

void MainWindow::slot1()
{
    QFile file("/tmp/default.txt");
    file.open(QIODevice::ReadOnly);

    TreeModel model(file.readAll());
    file.close();
    ui->treeView->setModel(&model);
    ui->treeView->update();

   // update a text label just to check:
    ui->label->setText( "coucou");
}

Any suggestion welcome !
-- 
Mathieu