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model.h Example File
^{demos/interview/model.h}

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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