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imageviewer.h Example File
widgets/imageviewer/imageviewer.h

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 #ifndef IMAGEVIEWER_H
 #define IMAGEVIEWER_H

 #include <QMainWindow>
 #include <QPrinter>

 class QAction;
 class QLabel;
 class QMenu;
 class QScrollArea;
 class QScrollBar;

 class ImageViewer : public QMainWindow
 {
     Q_OBJECT

 public:
     ImageViewer();

 private slots:
     void open();
     void print();
     void zoomIn();
     void zoomOut();
     void normalSize();
     void fitToWindow();
     void about();

 private:
     void createActions();
     void createMenus();
     void updateActions();
     void scaleImage(double factor);
     void adjustScrollBar(QScrollBar *scrollBar, double factor);

     QLabel *imageLabel;
     QScrollArea *scrollArea;
     double scaleFactor;

 #ifndef QT_NO_PRINTER
     QPrinter printer;
 #endif

     QAction *openAct;
     QAction *printAct;
     QAction *exitAct;
     QAction *zoomInAct;
     QAction *zoomOutAct;
     QAction *normalSizeAct;
     QAction *fitToWindowAct;
     QAction *aboutAct;
     QAction *aboutQtAct;

     QMenu *fileMenu;
     QMenu *viewMenu;
     QMenu *helpMenu;
 };

 #endif