window.h Example File
painting/transformations/window.h

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 #ifndef WINDOW_H
 #define WINDOW_H

 #include <QList>
 #include <QPainterPath>
 #include <QWidget>

 #include "renderarea.h"

 class QComboBox;

 class Window : public QWidget
 {
     Q_OBJECT

 public:
     Window();

 public slots:
     void operationChanged();
     void shapeSelected(int index);

 private:
     void setupShapes();

     enum { NumTransformedAreas = 3 };
     RenderArea *originalRenderArea;
     RenderArea *transformedRenderAreas[NumTransformedAreas];
     QComboBox *shapeComboBox;
     QComboBox *operationComboBoxes[NumTransformedAreas];
     QList<QPainterPath> shapes;
 };

 #endif