[Qt-interest] Custom Data by subclassing the QMimeData

[Sajjad]

Hello forum,

I have customized the QMimeData by sub classing it and the customized class
contains QHash<QString,QString> to contain those information. While reading
the database the node name, its field name and type are loaded into each of
the customized mime object. I have re-implemented the following functions
and they are as follows:


*************************************************

  QStringList H3DNodeData::formats() const

{

    return QMimeData::formats() << "NodeData/Node-Properties";

}

 bool H3DNodeData::hasFormat(const QString &mimetype) const

{

    return formats().contains(mimetype);

}

 QVariant H3DNodeData::retrieveData(const QString &mimetype,
QVariant::Type preferredType) const

{

   //not sure what this function should contain

 }




************************************************


And the class has the following structure:


*************************************************

class NodeData : public QMimeData

{

    Q_OBJECT

public:

    NodeData();

    ~NodeData();

     QStringList formats() const;

    bool hasFormat(const QString &mimetype) const;

     /////////////////////////////////////////////////////////////

    inline QString getNodeStr() const

    {

         return m_nodeName;

    }

     inline QHash<QString,QString> getFieldAndTypeStr() const

    {

         return m_fieldAndTypeName;

    }

     inline bool getAbstract() const

    {

        return m_isAbstract;

    }

     inline void setNodeStr(const QString &_l_nodeStr)

    {

         m_nodeName = _l_nodeStr;

    }

     inline void setFieldAndTypeStr(const QHash<QString,QString>
&_l_fieldAndTypeStr)

    {

         m_fieldAndTypeName = _l_fieldAndTypeStr;

    }

     inline void setAbstract(bool abs)

    {

        m_isAbstract = abs;

    }

     /////////////////////////////////////////////////////////////

 protected:

     QVariant retrieveData(const QString &mimetype, QVariant::Type
preferredType) const;

 private:

     //the string contains the node name

    QString m_nodeName;

     //each node contains fields and its type

    //and they are stored in the hash table

    QHash<QString,QString> m_fieldAndTypeName;

     //a boolean flag to mention

    //if the node is an abstract one or not

    bool m_isAbstract;

 };



*************************************************



Any hint on the retrieveData(...) function ?



Regards
Sajjad
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