mainwindow.h Example File
tools/plugandpaint/mainwindow.h

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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:
     void createActions();
     void createMenus();
     void loadPlugins();
     void populateMenus(QObject *plugin);
     void addToMenu(QObject *plugin, const QStringList &texts, QMenu *menu,
                    const char *member, QActionGroup *actionGroup = 0);

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

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

 #endif