treemodel.h Example File

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 #ifndef TREEMODEL_H
 #define TREEMODEL_H

 #include <QAbstractItemModel>
 #include <QModelIndex>
 #include <QVariant>

 class TreeItem;

 class TreeModel : public QAbstractItemModel
 {
     Q_OBJECT

 public:
     TreeModel(const QStringList &headers, const QString &data,
               QObject *parent = 0);
     ~TreeModel();

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

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

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

     Qt::ItemFlags flags(const QModelIndex &index) const override;
     bool setData(const QModelIndex &index, const QVariant &value,
                  int role = Qt::EditRole) override;
     bool setHeaderData(int section, Qt::Orientation orientation,
                        const QVariant &value, int role = Qt::EditRole) override;

     bool insertColumns(int position, int columns,
                        const QModelIndex &parent = QModelIndex()) override;
     bool removeColumns(int position, int columns,
                        const QModelIndex &parent = QModelIndex()) override;
     bool insertRows(int position, int rows,
                     const QModelIndex &parent = QModelIndex()) override;
     bool removeRows(int position, int rows,
                     const QModelIndex &parent = QModelIndex()) override;

 private:
     void setupModelData(const QStringList &lines, TreeItem *parent);
     TreeItem *getItem(const QModelIndex &index) const;

     TreeItem *rootItem;
 };

 #endif // TREEMODEL_H