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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 <QFileIconProvider>
     #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;
         QFileIconProvider iconProvider;
     };

     #endif