[Qt-qml] QAbstractItemModel and setData / setProperty

[vineeth]

Thanks a lot for pointing this out. I could directly declare a q_invokable
method in the model data and get this working.
--vineeth


On Tue, May 24, 2011 at 5:57 PM, Stephen Kelly <steveire at gmail.com> wrote:

> vineeth wrote:
>
> > Hello,
> >   I am using a C++ QAbstractItemModel as a model for a ListView and have
> > implemented the setData
> > <http://doc.trolltech.com/4.7.1/qabstractitemmodel.html#setData>and
> > items<http://doc.trolltech.com/4.7.1/qabstractitemmodel.html#flags>as
> > indicated in the documentation to make the items editable.
> >   However, if I call, model.setProperty( ... ) from the delegate I get
> > TypeError:
> > Result of expression 'model.setProperty' [undefined] is not a function.
> >  I get the same error, even for model.setData(...) call.
> >    calling model.<rolename> = <new role value>  from delegate throws
> > read-only error.
>
> setProperty comes from QObject. It doesn't have anything to do with the
> model API. setData is what you want if using C++.
>
> For QML, QAbstractItemModel::setData is not supported.
>
> >
> >   What is the right procedure to set a role value of a abstract item
> model
> > from a QML delegate?
>
> Currently you have to do something yourself. You don't want to couple your
> view to the model, so consider creating an additional QObject for QML with
> an API like
>
> class ModelDataSetter : public QObject
> {
>  ...
>  Q_INVOKABLE void setModelData(QAbstractItemModel *model,
>                        int row,
>                        int role,
>                        QVariant &data)
>  {
>    model->setData(model->index(row, 0), role, data);
>  }
> }
>
> Which you then use in QML:
>
> onClicked : _modelDataSetter.setModelData(ListView.view.model, model.index,
> someRole, someElement.text);
>
> or something similar.
>
> >
> >   Has anybody experienced this error and pls let me know your inputs in
> > solving it.
> >   ( I have reproduced this error in the AnimalModel
> > example<http://doc.trolltech.com/4.7.1/declarative-modelviews-
> abstractitemmodel.html>,
> > and attached the Qt Pro.)
> >   Kindly share your insights.
> >
> > Thanks.
> > --vineeth
>
>
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