- Qt 5.5
- Qt Widgets
- Image Viewer Example
- imageviewer.h Example File
- Qt 5.5.1 Reference Documentation

# imageviewer.h Example File

widgets/imageviewer/imageviewer.h

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    **
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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    #ifndef IMAGEVIEWER_H
    #define IMAGEVIEWER_H

    #include <QMainWindow>
    #ifndef QT_NO_PRINTER
    #include <QPrinter>
    #endif

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

    class ImageViewer : public QMainWindow
    {
        Q_OBJECT

    public:
        ImageViewer();
        bool loadFile(const QString &);

    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