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imagecomposer.h Example File
painting/imagecomposition/imagecomposer.h

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 #ifndef IMAGECOMPOSER_H
 #define IMAGECOMPOSER_H

 #include <QPainter>
 #include <QWidget>

 class QComboBox;
 class QLabel;
 class QToolButton;

 class ImageComposer : public QWidget
 {
     Q_OBJECT

 public:
     ImageComposer();

 private slots:
     void chooseSource();
     void chooseDestination();
     void recalculateResult();

 private:
     void addOp(QPainter::CompositionMode mode, const QString &name);
     void chooseImage(const QString &title, QImage *image, QToolButton *button);
     void loadImage(const QString &fileName, QImage *image, QToolButton *button);
     QPainter::CompositionMode currentMode() const;
     QPoint imagePos(const QImage &image) const;

     QToolButton *sourceButton;
     QToolButton *destinationButton;
     QComboBox *operatorComboBox;
     QLabel *equalLabel;
     QLabel *resultLabel;

     QImage sourceImage;
     QImage destinationImage;
     QImage resultImage;
 };

 #endif