mainwindow.h Example File

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QtGui/QMainWindow>
 #include <QDeclarativeView>

 #include <QApplication>
 #include <QDeclarativeView>
 #include <QDeclarativeContext>
 #include <QGraphicsObject>
 #include <QMouseEvent>
 #include <QPluginLoader>

 #include "myeventfilter.h"

 class GameEngine;
 class LevelPluginInterface;

 class MainWindow : public QDeclarativeView
 {
     Q_OBJECT

 public:
     MainWindow(QWidget *parent = 0);
     ~MainWindow();

 public slots:
     void levelActivated(int);
     void activationChangeFiltered();

 private:
     void printObjectTree(QObject* parent);
     void loadLevelPlugins();
     bool loadPlugins(QString drive, QString pluginDir);
     void createPlugin(int index = -1);

 private:
     GameEngine*             m_gameEngine;
     LevelPluginInterface*   m_levelPlugin;
     QList<QPluginLoader*>   m_plugins;

     MyEventFilter*          m_eventFilter;
 };

 #endif // MAINWINDOW_H