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) Q_DECL_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