QML ListModel for interaction with C++

[shock]

You have QDeclarativeItem instances all over your code, just take a look.

This is the structure that works for me by now:

class QMLPtrAbstractItem : public QObject
{
	Q_OBJECT
public:
    virtual ~QMLPtrAbstractItem() { }
 
    virtual bool setData(int role, const QVariant &value) = 0;
    virtual QVariant getData(int role) const = 0;
 
    virtual int getUID() const = 0;
    virtual void setUID(int uid) = 0;
};
 
class EmpData : public QMLPtrAbstractItem
{
    Q_OBJECT
public:
    enum EmpRoles {
        Name = Qt::UserRole + 1,
        UID,
		Qualification
    };
 
    static QHash<int, QByteArray> getQMLRoles(){
        QHash<int, QByteArray> roles;
        roles[Name]				= "name";
        roles[UID]				= "uid";
        roles[Qualification]    = "qualification";
        return roles;
    }
 
    EmpData()  {}
 
    virtual QVariant getData(int role) const {
        if (role == Name)
            return getName();
        else if (role == UID)
            return getUID();
        else if (role == Qualification)
            return getQualification();
        return QVariant();
    }
 
    virtual bool setData(int role, const QVariant &value) {
        bool changed = false;
        if (role == Name){
            changed = true;
            setName(value.toString());
        }
        else if (role == UID){
            changed = true;
            setUID(value.toInt());
        }
        else if (role == Qualification){
            changed = true;
            setQualification(value.toString());
        }
        return changed;
    }
 
private:
.....
};
 
class TaskData : public QMLPtrAbstractItem
{
    Q_OBJECT
 
public:
    enum TaskRoles {
        UID = Qt::UserRole + 1,
        Name,
        BgColor1,
        BgColor2,
        XPos,
        YPos,
        Length,
        CreationUser,
        OrderType,
        Active,
        Index
    };
 
    static QHash<int, QByteArray> getQMLRoles(){
        QHash<int, QByteArray> roles;
        roles[UID]          = "uid";
        roles[Name]         = "name";
        roles[BgColor1]     = "bgColor1";
        roles[BgColor2]     = "bgColor2";
        roles[XPos]         = "xPos";
        roles[YPos]         = "yPos";
        roles[Length]       = "length";
        roles[CreationUser] = "creationuser";
        roles[OrderType]    = "orderType";
        roles[Active]       = "active";
        roles[Index]        = "index";
        return roles;
    }
 
    TaskData()  {
        _bgcolor1 = "#FEFEFE";
        _bgcolor2 = "#ededeb";
        _active = false;
    }
    virtual ~TaskData() { }
 
.....
 
    QVariant getData(int role) const {
        if (role == UID)
            return getUID();
        else if (role == Name)
            return getName();
        else if (role == BgColor1)
            return getBgColor1();
        else if (role == BgColor2)
            return getBgColor2();
        else if (role == XPos)
            return getXPos();
        else if (role == YPos)
            return getYPos();
        else if (role == Length)
            return getLength();
        else if (role == CreationUser)
            return getCreationUser();
        else if (role == OrderType)
            return getOrderType();
        else if (role == Active)
            return isActive();
        else if (role == Index)
            return getIndex();
        return QVariant();
    }
 
    bool setData(int role, const QVariant &value) {
        bool changed = false;
        if (role == UID){
            changed = true;
            setUID(value.toInt());
        }
        else if (role == Name){
            changed = true;
            setName(value.toString());
        }
        else if (role == BgColor1){
            changed = true;
            setBgColor1(value.toString());
        }
        else if (role == BgColor2){
            changed = true;
            setBgColor2(value.toString());
        }
        else if (role == XPos){
            changed = true;
            setXPos(value.toInt());
        }
        else if (role == YPos){
            changed = true;
            setYPos(value.toInt());
        }
        else if (role == Length){
            changed = true;
            setLength(value.toInt());
        }
        else if (role == CreationUser){
            changed = true;
            setCreationUser(value.toInt());
        }
        else if (role == OrderType){
            changed = true;
            setOrderType(value.toInt());
        }
        else if (role == Active){
            changed = true;
            setActive(value.toInt());
        }
        else if (role == Index){
            changed = true;
            setIndex(value.toInt());
        }
        return changed;
    }
 
private:
 ....
};
 
class OrderData : public TaskData
{
    Q_OBJECT
 ....
}
 
class EventData : public TaskData
{
    Q_OBJECT
...
}
 
class QMLPtrNotificationModel : public QAbstractListModel
{
    Q_OBJECT
....
}
 
QVariant QMLPtrNotificationModel::data(const QModelIndex &index, int role) const
{
    if (index.row() < 0 || index.row() > lst.size())
        return QVariant();
 
    const QMLPtrAbstractItem * const ptrItem = lst[index.row()];
 
    return ptrItem->getData(role);
}
 
bool QMLPtrNotificationModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (index.row() >= 0 && index.row() < lst.size()) {
 
        QMLPtrAbstractItem * const ptrItem = lst.at(index.row());
        if(ptrItem){
            bool changed = ptrItem->setData(role, value);
 
            if(changed)
                emit dataChanged(index, index);
            return changed;
        }
        return false;
    }else
        qDebug() << "QMLPtrNotificationModel::setData( " << role << ")";
 
    return false;
}

class QMLPtrAbstractItem : public QObject
{
	Q_OBJECT
public:
    virtual ~QMLPtrAbstractItem() { }

    virtual bool setData(int role, const QVariant &value) = 0;
    virtual QVariant getData(int role) const = 0;

    virtual int getUID() const = 0;
    virtual void setUID(int uid) = 0;
};

class EmpData : public QMLPtrAbstractItem
{
    Q_OBJECT
public:
    enum EmpRoles {
        Name = Qt::UserRole + 1,
        UID,
		Qualification
    };

    static QHash<int, QByteArray> getQMLRoles(){
        QHash<int, QByteArray> roles;
        roles[Name]				= "name";
        roles[UID]				= "uid";
        roles[Qualification]    = "qualification";
        return roles;
    }

    EmpData()  {}

    virtual QVariant getData(int role) const {
        if (role == Name)
            return getName();
        else if (role == UID)
            return getUID();
        else if (role == Qualification)
            return getQualification();
        return QVariant();
    }

    virtual bool setData(int role, const QVariant &value) {
        bool changed = false;
        if (role == Name){
            changed = true;
            setName(value.toString());
        }
        else if (role == UID){
            changed = true;
            setUID(value.toInt());
        }
        else if (role == Qualification){
            changed = true;
            setQualification(value.toString());
        }
        return changed;
    }

private:
.....
};

class TaskData : public QMLPtrAbstractItem
{
    Q_OBJECT

public:
    enum TaskRoles {
        UID = Qt::UserRole + 1,
        Name,
        BgColor1,
        BgColor2,
        XPos,
        YPos,
        Length,
        CreationUser,
        OrderType,
        Active,
        Index
    };

    static QHash<int, QByteArray> getQMLRoles(){
        QHash<int, QByteArray> roles;
        roles[UID]          = "uid";
        roles[Name]         = "name";
        roles[BgColor1]     = "bgColor1";
        roles[BgColor2]     = "bgColor2";
        roles[XPos]         = "xPos";
        roles[YPos]         = "yPos";
        roles[Length]       = "length";
        roles[CreationUser] = "creationuser";
        roles[OrderType]    = "orderType";
        roles[Active]       = "active";
        roles[Index]        = "index";
        return roles;
    }

    TaskData()  {
        _bgcolor1 = "#FEFEFE";
        _bgcolor2 = "#ededeb";
        _active = false;
    }
    virtual ~TaskData() { }

.....

    QVariant getData(int role) const {
        if (role == UID)
            return getUID();
        else if (role == Name)
            return getName();
        else if (role == BgColor1)
            return getBgColor1();
        else if (role == BgColor2)
            return getBgColor2();
        else if (role == XPos)
            return getXPos();
        else if (role == YPos)
            return getYPos();
        else if (role == Length)
            return getLength();
        else if (role == CreationUser)
            return getCreationUser();
        else if (role == OrderType)
            return getOrderType();
        else if (role == Active)
            return isActive();
        else if (role == Index)
            return getIndex();
        return QVariant();
    }

    bool setData(int role, const QVariant &value) {
        bool changed = false;
        if (role == UID){
            changed = true;
            setUID(value.toInt());
        }
        else if (role == Name){
            changed = true;
            setName(value.toString());
        }
        else if (role == BgColor1){
            changed = true;
            setBgColor1(value.toString());
        }
        else if (role == BgColor2){
            changed = true;
            setBgColor2(value.toString());
        }
        else if (role == XPos){
            changed = true;
            setXPos(value.toInt());
        }
        else if (role == YPos){
            changed = true;
            setYPos(value.toInt());
        }
        else if (role == Length){
            changed = true;
            setLength(value.toInt());
        }
        else if (role == CreationUser){
            changed = true;
            setCreationUser(value.toInt());
        }
        else if (role == OrderType){
            changed = true;
            setOrderType(value.toInt());
        }
        else if (role == Active){
            changed = true;
            setActive(value.toInt());
        }
        else if (role == Index){
            changed = true;
            setIndex(value.toInt());
        }
        return changed;
    }

private:
 ....
};

class OrderData : public TaskData
{
    Q_OBJECT
 ....
}

class EventData : public TaskData
{
    Q_OBJECT
...
}

class QMLPtrNotificationModel : public QAbstractListModel
{
    Q_OBJECT
....
}

QVariant QMLPtrNotificationModel::data(const QModelIndex &index, int role) const
{
    if (index.row() < 0 || index.row() > lst.size())
        return QVariant();

    const QMLPtrAbstractItem * const ptrItem = lst[index.row()];

    return ptrItem->getData(role);
}

bool QMLPtrNotificationModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (index.row() >= 0 && index.row() < lst.size()) {

        QMLPtrAbstractItem * const ptrItem = lst.at(index.row());
        if(ptrItem){
            bool changed = ptrItem->setData(role, value);

            if(changed)
                emit dataChanged(index, index);
            return changed;
        }
        return false;
    }else
        qDebug() << "QMLPtrNotificationModel::setData( " << role << ")";

    return false;
}

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QML looks like that:

Repeater {
        id: tasks
        model: taskModel // is registered via context() - holds OrderData and EventData via virtual binding
        delegate: TaskData { }
    }

Repeater {
        id: tasks
        model: taskModel // is registered via context() - holds OrderData and EventData via virtual binding
        delegate: TaskData { }
    }

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There is no QDeclarativeItem anymore - and it compiles and works

Different model instances of what?

Different Model instances: one for OrderData, one for EventData and one for EmpData

As i think the code will also work if i rename the classes to *Cpp? They just have the same names as the delegates - The QML delegate gets the
Data from the Model provided in the Repeater via accessing the roles of the model?!

TaskData.qml:

Text {
        id: taskName
        anchors.centerIn: parent
        text: name; // sets the name as text -> accesses the given model and executes data() for the role "name" which returns the name !?
         color: "white";
    }

Text {
        id: taskName
        anchors.centerIn: parent
        text: name; // sets the name as text -> accesses the given model and executes data() for the role "name" which returns the name !?
         color: "white";
    }

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Where is my structural error? =(

-------------------

I tried it by renamin the classes to *Cpp - works either

class EmpDataCpp : public QMLPtrAbstractItem { ... }
class TaskDataCpp : public QMLPtrAbstractItem { ... }
class OrderDataCpp : public TaskDataCpp { .. .}
class EventDataCpp : public TaskDataCpp { .. .}

class EmpDataCpp : public QMLPtrAbstractItem { ... }
class TaskDataCpp : public QMLPtrAbstractItem { ... }
class OrderDataCpp : public TaskDataCpp { .. .}
class EventDataCpp : public TaskDataCpp { .. .}

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With Delegates:

Repeater {
                id: empGrid
                model: empModel
                delegate: Employee { }
            }
    Repeater {
        id: tasks
        model: taskModel
        delegate: TaskData { }
    }

Repeater {
                id: empGrid
                model: empModel
                delegate: Employee { }
            }
    Repeater {
        id: tasks
        model: taskModel
        delegate: TaskData { }
    }

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