Can a QDeclarativeListProperty be accessed directly, instead of as a model?
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I'm trying to use a QDeclarativeListProperty in order to manage a list of parameters, mostly for the purposes of displaying them in a ListView. However, I would also like to be able to directly access the parameters in QML from the QDeclarativeListProperty so that I can display/modify individual parameters on different screens.
My class is called ParameterClass, for which I've created a QList:
@
class SystemData : public QObject
{
Q_OBJECT
Q_PROPERTY(QDeclarativeListProperty<ParameterClass> parameters READ parameters NOTIFY parametersChanged)
QDeclarativeListProperty<ParameterClass> parameters();... QList<ParameterClass *> m_parameterList;}
@
I've also registered the ParameterClass class and set up an instance of my SystemData as a property, which I know is necessary.@
m_context->setContextProperty("SystemData", m_pSystemData);
qmlRegisterType<ParameterClass>();
@Now, what I want to do within QML is something like this:
@
Rectangle {
id: frame
property variant parameter: SystemData.parameters[5]
...
}
@I'm just not getting it to work: I keep getting back [undefined]. Am I wasting my time, or am I missing something?
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I'm not familiar with qt 4.x but I guess you can use "at function":http://harmattan-dev.nokia.com/docs/library/html/qt4/qdeclarativelistproperty.html#AtFunction-typedef directly inside qml as in qt 5.x.
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[quote author="dasun" date="1382849565"]I'm not familiar with qt 4.x but I guess you can use "at function":http://harmattan-dev.nokia.com/docs/library/html/qt4/qdeclarativelistproperty.html#AtFunction-typedef directly inside qml as in qt 5.x.[/quote]
That would work for a QList<QObject*>, but I'm working with a QDeclarativeListProperty.
I now have this working. I think there was one error that I was facing that had to do with something unrelated to what I was trying to do here, but also I was informed "here":http://stackoverflow.com/questions/19503898/can-a-qdeclarativelistproperty-be-accessed-directly-instead-of-as-a-model that I needed to setup my context properties and registered types before loading my source URL. Once I rearranged my code to make that happen, everything did start to work. I don't know if that's a known issue or bug, and if the same goes for Qt 5.x.