mainwindow.h Example File

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QDir>
 #include <QMainWindow>
 #include <QStringList>

 class QAction;
 class QActionGroup;
 class QMenu;
 class QScrollArea;

 class PaintArea;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

 private slots:
     void open();
     bool saveAs();
     void brushColor();
     void brushWidth();
     void changeBrush();
     void insertShape();
     void applyFilter();
     void about();
     void aboutPlugins();

 private:
     typedef void (MainWindow::*Member)();

     void createActions();
     void createMenus();
     void loadPlugins();
     void populateMenus(QObject *plugin);
     void addToMenu(QObject *plugin, const QStringList &texts, QMenu *menu,
                    Member member, QActionGroup *actionGroup = nullptr);

     PaintArea *paintArea = nullptr;
     QScrollArea *scrollArea = nullptr;
     QDir pluginsDir;
     QStringList pluginFileNames;

     QMenu *fileMenu = nullptr;
     QMenu *brushMenu = nullptr;
     QMenu *shapesMenu = nullptr;
     QMenu *filterMenu = nullptr;
     QMenu *helpMenu = nullptr;
     QActionGroup *brushActionGroup = nullptr;
     QAction *openAct = nullptr;
     QAction *saveAsAct = nullptr;
     QAction *exitAct = nullptr;
     QAction *brushWidthAct = nullptr;
     QAction *brushColorAct = nullptr;
     QAction *aboutAct = nullptr;
     QAction *aboutQtAct = nullptr;
     QAction *aboutPluginsAct = nullptr;
 };

 #endif