QSortFilterProxyModel* as signal argument is undefined in QML

Diracsbracket

Hi,
I have the following class to be used as model for a QML TableView

class ProcessProxyModel : public QSortFilterProxyModel {
Q_OBJECT
...
signals:
void procModelReady(const ProcessProxyModel* procmodel);

private:
ProcessProxyModel* m_procModel;
}

The class is registered as:

    qmlRegisterUncreatableType<ProcessProxyModel>("com.dirac", 1, 0, "ProcessProxyModel", "Type is not allowed to be instantiated");

When the model is ready, I emit a signal as follows:

emit procModelReady(m_procModel);

In QML however, the object passed is not recognized and reported as undefined.

On the other hand, if I explicitly query for the model via:

Q_INVOKABLE ProcessProxyModel* getProcProxy() const {
   return m_procModel;
}

it works.

To summarize, in QML:

Connections {
        target: sysmon

        function onProcModelReady(model)    {
            console.debug(model)                                 // <--- prints undefined
            console.debug(sysmon.getProcProxy()) //<-- Works correctly
        }

Why is the signal argument's type not recognized?

SGaist

Hi,

Don't you have any runtime message about an unknown type being used in your signal ?

Diracsbracket

@SGaist
Thanks, but no such message appears.

Diracsbracket

The problem was due to the const specifier.

signals:
void procModelReady(const ProcessProxyModel* procmodel);

Changing it to:

signals:
void procModelReady(ProcessProxyModel* procmodel);

works.