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