mainwindow.h Example File

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>

 class MdiChild;
 class QAction;
 class QMenu;
 class QMdiArea;
 class QMdiSubWindow;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

     bool openFile(const QString &fileName);

 protected:
     void closeEvent(QCloseEvent *event) override;

 private slots:
     void newFile();
     void open();
     void save();
     void saveAs();
     void updateRecentFileActions();
     void openRecentFile();
 #ifndef QT_NO_CLIPBOARD
     void cut();
     void copy();
     void paste();
 #endif
     void about();
     void updateMenus();
     void updateWindowMenu();
     MdiChild *createMdiChild();
     void switchLayoutDirection();

 private:
     enum { MaxRecentFiles = 5 };

     void createActions();
     void createStatusBar();
     void readSettings();
     void writeSettings();
     bool loadFile(const QString &fileName);
     static bool hasRecentFiles();
     void prependToRecentFiles(const QString &fileName);
     void setRecentFilesVisible(bool visible);
     MdiChild *activeMdiChild() const;
     QMdiSubWindow *findMdiChild(const QString &fileName) const;

     QMdiArea *mdiArea;

     QMenu *windowMenu;
     QAction *newAct;
     QAction *saveAct;
     QAction *saveAsAct;
     QAction *recentFileActs[MaxRecentFiles];
     QAction *recentFileSeparator;
     QAction *recentFileSubMenuAct;
 #ifndef QT_NO_CLIPBOARD
     QAction *cutAct;
     QAction *copyAct;
     QAction *pasteAct;
 #endif
     QAction *closeAct;
     QAction *closeAllAct;
     QAction *tileAct;
     QAction *cascadeAct;
     QAction *nextAct;
     QAction *previousAct;
     QAction *windowMenuSeparatorAct;
 };

 #endif