[Interest] QAbstractItemModel and Qml - modelData is null

[Pierre-Yves Siret]

2017-10-16 20:11 GMT+02:00 Nuno Santos <nunosantos at imaginando.pt>:

> Hi,
>
> I have for the first time defined a QAbstractItemModel to use on Qml
> because I needed to have a filtered version of this model
> using QSortFilterProxyModel.
>
> I have the documentation here -> http://doc.qt.io/archives/
> qt-5.5/qtquick-modelviewsdata-cppmodels.html and followed the example
> given. I have defined the following roles:
>
> enum PatchRoles {
>     IdRole = Qt::UserRole + 1,
>     NameRole,
>     ModifiedRole,
>     TagsRole,
>     ModelDataRole
> };
>
> And then under data retrieval method:
>
> QVariant IPatchManagerModel::data(const QModelIndex & index, int role)
> const
> {
>     if (index.row() < 0 || index.row() >= _patches.count())
>         return QVariant();
>
>     IPatch* patch = _patches.at(index.row());
>
>     if (role == IdRole)
>         return patch->id();
>     else if (role == NameRole)
>         return patch->nameLabel();
>     else if (role == ModifiedRole)
>         return patch->modified();
>     else if (role == TagsRole)
>         return patch->tags();
>     else if (role == ModelDataRole)
>        * return qVariantFromValue((void *) patch);*
>
>     return QVariant();
> }
>
> Every role works except modelData, whenever I try to access it it gives me
> null on the Qml side.
>
> Does anyone knows what am I doing wrong?
>
> Thanks,
>
> Regards,
>
> Nuno
>
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>
>
I'm gonna go out on a limb and say that the QML engine can't deal with
void* type.
What type is patch? Put it in the variant as a QObject* instead if you can.

Regards
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