Properties in data for subclass of QAbstractListModel

dxm_surfer

Hi there,
I want to have a custom ListModel, so I extended QAbstractListModel. My Data has a property and so it has to be a subclass of QObject.
This is the code of the four files:

#ifndef SIMPLEDATA_H
#define SIMPLEDATA_H

#include <QObject>

class SimpleData : public QObject {

    Q_OBJECT
    Q_PROPERTY(QString value READ value WRITE setValue NOTIFY valueChanged)

public:
    SimpleData(QObject *parent = 0);
    ~SimpleData();

    void setValue(const QString &value);
    QString value() const;

signals:
    void valueChanged(QString);

private:
    QString m_value;
};

#endif // SIMPLEDATA_H

#include "simpledata.h"

SimpleData::SimpleData(QObject *parent) : QObject(parent) { }

SimpleData::~SimpleData() { }

void SimpleData::setValue(const QString &value) {
    m_value = value;
    emit valueChanged(m_value);
}

QString SimpleData::value() const {
    return m_value;
}

#ifndef SIMPLEMODEL_H
#define SIMPLEMODEL_H

#include <QAbstractListModel>
#include "simpledata.h"

class SimpleModel : public QAbstractListModel {

    Q_OBJECT

public:
    enum SimpleDataRoles {
        ValueRole = Qt::UserRole + 1
    };

    SimpleModel(QObject *parent = 0);

    void addData(const SimpleData &data);
    int rowCount(const QModelIndex &parent = QModelIndex()) const;
    QVariant data(const QModelIndex &index, int role) const;


protected:
    QHash<int, QByteArray> roleNames() const;

private:
    QList<SimpleData> m_data;
};

#endif // SIMPLEMODEL_H

#include "simplemodel.h"

SimpleModel::SimpleModel(QObject *parent) : QAbstractListModel(parent) { }

void SimpleModel::addData(const SimpleData &data) {
    beginInsertRows(QModelIndex(), rowCount(), rowCount());
    m_data << data;
    endInsertRows();
}

int SimpleModel::rowCount(const QModelIndex &parent) const {
    Q_UNUSED(parent);
    return m_data.count();
}

QVariant SimpleModel::data(const QModelIndex &index, int role) const {
    if(index.row() < 0 || index.row() >= m_data.count()) return QVariant();

    const SimpleData &data = m_data[index.row()];
    if(role == ValueRole) return data.value();

    return QVariant();
}

QHash<int, QByteArray> SimpleModel::roleNames() const {
    QHash<int, QByteArray> roles;
    roles[ValueRole] = "value";

    return roles;
}

I'm sorry I can't give you less code, but I don't have any clue about the source of the error. The compiler says:

/home/xxx/Qt/5.7/gcc_64/include/QtCore/qlist.h:431: error: use of deleted function 'SimpleData::SimpleData(const SimpleData&)'
     if (QTypeInfo<T>::isLarge || QTypeInfo<T>::isStatic) n->v = new T(t);

Additionally, there are several errors about private constructors of QObject.
Can you explain me where I made the mistake and why those errors occur?
Thanks

mrjj

@dxm_surfer said:

QList<SimpleData> m_data;

Hi and welcome
Due to signals and design, QObject based classes are not allowed to be copied .

So
QList<SimpleData> m_data;
should be
QList<SimpleData *> m_data;
please see
http://doc.qt.io/qt-5/qobject.html
section
No Copy Constructor or Assignment Operator

VRonin

QObjects can't be copied.
if you can remove the NOTIFY from the property and hence the signal you can remove the QObject inheritance and change Q_OBJECT to Q_GADGET otherwise you'll have to save a pointer to the QObject not the Qobject itself

dxm_surfer

Thanks, I think I got it. I don't feel that comfortable with C++ though...