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# model.h Example File
demos/interview/model.h

        /****************************************************************************
        **
        ** Copyright (C) 2004-2006 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
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        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        ****************************************************************************/

        #ifndef MODEL_H
        #define MODEL_H

        #include <QAbstractItemModel>
        #include <QVector>

        class Model : public QAbstractItemModel
        {
            Q_OBJECT

        public:
            Model(int rows, int columns, QObject *parent = 0);
            ~Model();

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

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

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

            bool hasChildren(const QModelIndex &parent) const;
            Qt::ItemFlags flags(const QModelIndex &index) const;
            bool isDragEnabled(const QModelIndex &index) const;

        private:

            struct Node
            {
                Node(Node *parent = 0) : parent(parent), children(0) {}
                ~Node() { delete children; }
                Node *parent;
                QVector<Node> *children;
            };

            Node *node(int row, Node *parent) const;
            Node *parent(Node *child) const;
            int row(Node *node) const;

            int rc, cc;
            QVector<Node> *tree;
        };

        #endif