imageviewer.h Example File
^{widgets/imageviewer/imageviewer.h}

    /****************************************************************************
    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
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    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
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    ** http://www.trolltech.com/products/qt/opensource.html
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    ** review the following information:
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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;

        QPrinter printer;

        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