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# treemodel.h Example File
itemviews/editabletreemodel/treemodel.h

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     #ifndef TREEMODEL_H
     #define TREEMODEL_H

     #include <QAbstractItemModel>
     #include <QModelIndex>
     #include <QVariant>

     class TreeItem;

     class TreeModel : public QAbstractItemModel
     {
         Q_OBJECT

     public:
         TreeModel(const QStringList &headers, const QString &data,
                   QObject *parent = 0);
         ~TreeModel();

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

         QModelIndex index(int row, int column,
                           const QModelIndex &parent = QModelIndex()) const;
         QModelIndex parent(const QModelIndex &index) const;

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

         Qt::ItemFlags flags(const QModelIndex &index) const;
         bool setData(const QModelIndex &index, const QVariant &value,
                      int role = Qt::EditRole);
         bool setHeaderData(int section, Qt::Orientation orientation,
                            const QVariant &value, int role = Qt::EditRole);

         bool insertColumns(int position, int columns,
                            const QModelIndex &parent = QModelIndex());
         bool removeColumns(int position, int columns,
                            const QModelIndex &parent = QModelIndex());
         bool insertRows(int position, int rows,
                         const QModelIndex &parent = QModelIndex());
         bool removeRows(int position, int rows,
                         const QModelIndex &parent = QModelIndex());

     private:
         void setupModelData(const QStringList &lines, TreeItem *parent);
         TreeItem *getItem(const QModelIndex &index) const;

         TreeItem *rootItem;
     };

     #endif