demos/interview/model.h

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/****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the demonstration applications 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:
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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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

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