mainwindow.h Example File
mainwindows/sdi/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>

 class QAction;
 class QMenu;
 class QTextEdit;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();
     MainWindow(const QString &fileName);

 protected:
     void closeEvent(QCloseEvent *event);

 private slots:
     void newFile();
     void open();
     bool save();
     bool saveAs();
     void about();
     void documentWasModified();

 private:
     void init();
     void createActions();
     void createMenus();
     void createToolBars();
     void createStatusBar();
     void readSettings();
     void writeSettings();
     bool maybeSave();
     void loadFile(const QString &fileName);
     bool saveFile(const QString &fileName);
     void setCurrentFile(const QString &fileName);
     QString strippedName(const QString &fullFileName);
     MainWindow *findMainWindow(const QString &fileName);

     QTextEdit *textEdit;
     QString curFile;
     bool isUntitled;

     QMenu *fileMenu;
     QMenu *editMenu;
     QMenu *helpMenu;
     QToolBar *fileToolBar;
     QToolBar *editToolBar;
     QAction *newAct;
     QAction *openAct;
     QAction *saveAct;
     QAction *saveAsAct;
     QAction *closeAct;
     QAction *exitAct;
     QAction *cutAct;
     QAction *copyAct;
     QAction *pasteAct;
     QAction *aboutAct;
     QAction *aboutQtAct;
 };

 #endif