model gets not assigned to custom class

themts

Hi guys,

I have a custom component which implements a Q_PROPERTY like this:

class NChartPlotter : public QQuickFramebufferObject
{
    Q_OBJECT
    Q_PROPERTY(NChartAbstractDataModel* dataModel READ dataModel WRITE setDataModel)

In main.cpp I create an instance of a NChartAbstractDataModel derived class and I set it as a contextProperty:

NTestChartDataModel dm; //NTestChartDataModel is a subclass of NChartAbstractDataModel
engine.rootContext()->setContextProperty("charDataModel", &dm);

in QML I want to assign my model to a my view-component:

        ChartPlot {
            id: renderer
            anchors.fill: parent
            textureFollowsItemSize: true
            dataModel: charDataModel
        }

PROBLEM:
setDataModel gets never called.

What am I doing wrong here?
btw. this is my first qml-application.

CU
mts

themts

ok, maybe I should have looked in the application-output earlier...
-> "Unable to assign NTestChartDataModel to [unknown property type]"

I do I let qml know about this class?

EDIT:
ok, I found that I have to use qRegisterMetaType to register my classType but I don't understand why I have to implement a copy-constructor?!
Anyway, even if I implement a copy constructor to make the usage of qRegisterMetaType possible, I still get the "unknown property type" error on runtime.

chrisadams

You need to use qmlRegisterType, not just qRegisterMetaType, for any type which you expose to QML in such a way that you expect property resolution (including method invocation) to occur on an instance of that type.