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How to set qml listview model in C++

  • Hi,

    I dynamically create a custom qml listview in my C++ and it works great, but I can't set the model. Like others listview properties, I tried with "setProperty" but at runtime it can't find the model roles :
    const MyListModel* myModel = new MyListModel();
    myListView->setProperty("model", myModel);

    Someone has an idea ?


  • When you say you dynamically create a custom qml listview, do you have a ListView component in your qml file and creating an instance of it in your c++ code?? I don't see you using QDeclarativeCompoenent to load the component and create an object out of it?

    Generally this is how it is done.
    QDeclarativeView view;
    QDeclarativeEngine *engine = view.engine();
    QDeclarativeComponent component(engine, QUrl::fromLocalFile("listview.qml"));

    QObject *myObject = component.create();

  • Yes I do this, but my problem is that the model roles can't be found at runtime.
    Which type of model do you use in your example ?
    For my part, I use a derived class of QAbstractListModel.

  • Ok.. I had a QList<QObject*> which I have set as model.

    contactsList.append(new contactDetails(firstName, phoneNumber));

    ctxt->setContextProperty("favouritesModel", QVariant::fromValue(contactsList));

    where contactsList is

    @QList<QObject*> contactsList;

    and contactDetails is a QObject derived class with two properties contactName and contactNumber.

    I have not tried to set QAbstractListModel as a model.

  • You should have the roles set to your c++ model using setRoles. In QML simply specify the rolename in the model delegate

    ListView {
    id : myListView;
    deletegate: myDelegate;

    Component {
    id: myDelegate;
    Text {
    id: myText
    text: myCustomTextRole // this is the name of the role you should handle in data() of model class

  • I solved my problem, I was trying to set directly a pointer to the "model" property of the qml listview but it can't be done like this. The solution is to use the QDeclarativeContext :
    QDeclarativeEngine *engine = new QDeclarativeEngine();
    QDeclarativeContext context = engine->rootContext();
    myModel = new MyListModel();
    context->setContextProperty("myModelName", myModel);
    myQMLListView->setProperty("model", context->contextProperty("myModelName"));

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