mainwindow.h Example File

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  #ifndef MAINWINDOW_H
  #define MAINWINDOW_H

  #include <QMainWindow>

  class QAction;
  class QMenu;

  class Assistant;
  class TextEdit;

  class MainWindow : public QMainWindow
  {
      Q_OBJECT

  public:
      MainWindow();
      void showDocumentation(const QString &file);

  private slots:
      void about();
      void showDocumentation();
      void open();

  protected:
      void closeEvent(QCloseEvent *event) override;

  private:
      void createActions();
      void createMenus();

      Assistant *assistant;
      TextEdit *textViewer;

      QMenu *fileMenu;
      QMenu *helpMenu;

      QAction *assistantAct;
      QAction *clearAct;
      QAction *openAct;
      QAction *exitAct;
      QAction *aboutAct;
      QAction *aboutQtAct;
  };

  #endif