Modify QAbstractListModel List from Qml

[fireghostea]

this is my code

devicemodel.h

class Device
{
public:
    Device(const int &nodeId ,const QString &type, const int &lampVoltage);
//![0]

    QString type() const;
    int lampVoltage() const;
    int nodeId() const;
public:
    QString m_type;
    int m_lampVoltage;
    int m_nodeId;
//![1]


};

class DeviceModel : public QAbstractListModel
{
    Q_OBJECT
public:
    enum DeviceRoles {
        NodeIdRole = Qt::UserRole + 1,
        TypeRole ,
        LampVoltageRole

    };

    DeviceModel(QObject *parent = 0);
//![1]

    void addDevice(const Device &Device);

    int rowCount(const QModelIndex & parent = QModelIndex()) const;

    QVariant data(const QModelIndex & index, int role = Qt::DisplayRole) const;

protected:
    QHash<int, QByteArray> roleNames() const;
private:
    QList<Device> m_Devices;
//![2]

public slots :
    void callFromQml(int index);

};

devicemodel.cpp

Device::Device(const int &nodeId ,const QString &type, const int &lampVoltage)
    : m_nodeId(nodeId) , m_type(type), m_lampVoltage(lampVoltage)
{
}

QString Device::type() const
{
    return m_type;
}

int Device::nodeId() const
{
    return m_nodeId;
}

int Device::lampVoltage() const
{
    return m_lampVoltage;
}

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



void DeviceModel::callFromQml(int index){

   Device k= m_Devices.at(index);
   qDebug() << k.type() << k.lampVoltage();
   k.m_lampVoltage = 5;
    emit dataChanged(createIndex(index,0), createIndex(index,0), {0,1,2} );
}

void DeviceModel::addDevice(const Device &Device)
{
    beginInsertRows(QModelIndex(), rowCount(), rowCount());
    m_Devices << Device;
    endInsertRows();
}

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

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

    const Device &Device = m_Devices[index.row()];
    if (role == NodeIdRole)
        return Device.nodeId();
    else if (role == TypeRole)
        return Device.type();
    else if (role == LampVoltageRole)
        return Device.lampVoltage();
    return QVariant();
}

//![0]
QHash<int, QByteArray> DeviceModel::roleNames() const {
    QHash<int, QByteArray> roles;
    roles[NodeIdRole] = "nodeId";
    roles[TypeRole] = "type";
    roles[LampVoltageRole] = "lampVoltage";
    return roles;
}

main.qml

ListView {
    width: 200; height: 250
    spacing: 10
    model: myModel
    delegate:
        Text { text: "my values :: " + type + ", " + lampVoltage

        MouseArea {
            anchors.fill: parent
            onClicked: {
                console.log("egwegweg");
                myModel.callFromQml(index);
                //lampVoltage = 10;

               // myModel.setData(index , 10 , 2);
            }
        }
    }
}

main.cpp

QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;
    DeviceModel model;
    model.addDevice(Device(1, "Medium" , 200));
    model.addDevice(Device(1, "Medium" , 200));
    model.addDevice(Device(1, "Medium" , 200));
    QQmlContext *ctxt = engine.rootContext();
    ctxt->setContextProperty("myModel", &model);
    engine.load(QUrl(QLatin1String("qrc:/main.qml")));

    model.addDevice(Device(1, "Medium" , 200));
    model.addDevice(Device(1, "Medium" , 200));
    model.addDevice(Device(1, "Medium" , 200));

    return app.exec();

want modify my item values from Qml i wrote a slot named callFromQml and pass index of item from qml to c++ code and want update the values from it but can not do it i don not know emit signal works or not and do not know pass index to it correctly or not and don not

[Eeli K]

@fireghostea I think you should use index() instead of createIndex().

[fireghostea]

@Eeli-K base on documentation type of firs parameter is Qmodelindex

[Eeli K]

@fireghostea Yes, but did you check what index(int) returns?

[fireghostea]

@Eeli-K yes
does not compile

[Eeli K]

@fireghostea What's the error message?

[fireghostea]

@Eeli-K no matching function for call to ‘DeviceModel::dataChanged(int&, int&, <brace-enclosed initializer list>)’
emit dataChanged(index, index, {0,1,2} );
^

[fireghostea]

This post is deleted!

[fireghostea]

@Eeli-K i find out my problem with index is just because my parameter name is index
i rename it and my code now is

Device *k= &m_Devices[inxd];
qDebug() << k->type() << k->lampVoltage();
k->m_lampVoltage = 5;
 emit dataChanged(index(inxd), index(inxd), {0,1,2} );

my parameter name is "inxd"