QListWidget sharing the same model

Question

If I understood the concept of the Qt models correct, then I can have multiple views, sharing the same model, so that when data is updated in the model, all views using it, will also update their view accordingly right?

Now I have multiple widgets in my application, which should have individual selections, but they should operate on the same underlying data. So when a row is added in one of the panels, the others should be able to display this new row as well.

Since the QListWidget provides all the features that I need, there would be no point in writing my own model and use it with a QListView. But I realized that QListWidget doesn't allow me to change the model, because the setModel()method is made private. So is there some way that I can achieve this, without the need of writing a full model on my own? I'm rather new to Qt so maybe there is a ready made general purpose model, that I can use? But so far I haven't found one.

Answer 1

You are trying to use QListWidget to set your own model which is not possible. You are better off using the MVC pattern the QT imposes. You can refer here on how to use the MVC pattern. This way would be more manageable and correct. Also you can make of the QStandardItemModel or the more general QAbstractListModel or QStringListModel model for lists. You can refer here for more details

But to answer your question yes they is a hack you can use.
Create a QListWidget and treat that widget as your model. For other views create a QListView and set the model that is returned by the QListWidget .
For e.g. refer

QAbstractItemModel* model = listWidget->model();

listView->setModel(model);
listView_2->setModel(model);

Then you can use the listWidget as your model. Any operation (add/delete) performed on the listWidget will also affect the listView and listView_2.

I am still of the opinion that instead of the hack creating your own model would be better and more correct.