mainwindow.h Example File
itemviews/editabletreemodel/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>
 #include <QModelIndex>

 #include "ui_mainwindow.h"

 class QAction;
 class QTreeView;
 class QWidget;

 class MainWindow : public QMainWindow, private Ui::MainWindow
 {
     Q_OBJECT

 public:
     MainWindow(QWidget *parent = 0);

 public slots:
     void updateActions();

 private slots:
     void insertChild();
     bool insertColumn(const QModelIndex &parent = QModelIndex());
     void insertRow();
     bool removeColumn(const QModelIndex &parent = QModelIndex());
     void removeRow();
 };

 #endif