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

/****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
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** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
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** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
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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


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Qt 4.2.0-rc1