Q_PROPERTY NOT WORKING PROPERLY

Question

I am developing a bb10 app in cascades. Here is the snippet for the header file

//applicationui.hpp
Q_PROPERTY(int metric READ getMetric WRITE setMetric NOTIFY metricChanged)
public:
    int getMetric();
    void setMetric(int newMetric);

signals:
void metricChanged(int);
private:
    int m_metric;


//applicationui.cpp
ApplicationUI::ApplicationUI(bb::cascades::Application *app) :
    QObject(app)
{
    qml->setContextProperty("_app", this);
    // Set created root object as the application scene
    app->setScene(root);

    m_metric = 1;

}

int ApplicationUI::getMetric(){
    return m_metric;
}

void ApplicationUI::setMetric(int newMetric){
m_metric = newMetric;
emit metricChanged(m_metric);
}

In my main.qml I have a RadioGroup whose selectedIndex I would like to set depending on the metric value

RadioGroup {
                id: distanceMetric
                Option { id: option1; text: "Miles"}
                Option { id: option2; text: "Kilometers"}
                onCreationCompleted: {
                    distanceMetric.selectedIndex = _app.metric
                }
 }

But this doesnt seem to be working as expected. Any suggestions would be appreciated. Thanx

Why is not working as expected? Which results is giving to you and wich results do you expect? — Narkha, Apr 02 '14 at 16:01

score 1 · Answer 1 · answered Apr 02 '14 at 15:52

1

Does you class inherit QObject (I guess it must as it seems to be a widget)?

Did you include the Q_OBJECT macro?

Maybe the doc could help if none of the above solve your issue? I'm not saying RTFM, just sometimes if you are using the website version of the docs, I find it a bit hard to find things.

answered Apr 02 '14 at 15:52

Uflex

1,396
1
13
32

You are giving wrong documentation to the OP. Blackberry 10 is not using Qt 5. – László Papp Apr 05 '14 at 06:50

score 1 · Answer 2 · answered Apr 24 '14 at 22:53

1

I suspect your QML scene is being created before you are setting the metric value to 1. Try changing this:

m_metric = 1;

to this:

setMetric(1);

so that the QML binding can be notified of the change.

answered Apr 24 '14 at 22:53

David

11
1
1

Q_PROPERTY NOT WORKING PROPERLY

2 Answers2