1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#ifndef IMAGEVIEWER_H
52#define IMAGEVIEWER_H
53
54#include <QMainWindow>
55#include <QImage>
56#if defined(QT_PRINTSUPPORT_LIB)
57# include <QtPrintSupport/qtprintsupportglobal.h>
58
59# if QT_CONFIG(printer)
60# include <QPrinter>
61# endif
62#endif
63
64QT_BEGIN_NAMESPACE
65class QAction;
66class QLabel;
67class QMenu;
68class QScrollArea;
69class QScrollBar;
70QT_END_NAMESPACE
71
72//! [0]
73class ImageViewer : public QMainWindow
74{
75 Q_OBJECT
76
77public:
78 ImageViewer(QWidget *parent = nullptr);
79 bool loadFile(const QString &);
80
81private slots:
82 void open();
83 void saveAs();
84 void print();
85 void copy();
86 void paste();
87 void zoomIn();
88 void zoomOut();
89 void normalSize();
90 void fitToWindow();
91 void about();
92
93private:
94 void createActions();
95 void createMenus();
96 void updateActions();
97 bool saveFile(const QString &fileName);
98 void setImage(const QImage &newImage);
99 void scaleImage(double factor);
100 void adjustScrollBar(QScrollBar *scrollBar, double factor);
101
102 QImage image;
103 QLabel *imageLabel;
104 QScrollArea *scrollArea;
105 double scaleFactor = 1;
106
107#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printer)
108 QPrinter printer;
109#endif
110
111 QAction *saveAsAct;
112 QAction *printAct;
113 QAction *copyAct;
114 QAction *zoomInAct;
115 QAction *zoomOutAct;
116 QAction *normalSizeAct;
117 QAction *fitToWindowAct;
118};
119//! [0]
120
121#endif
122

source code of qtbase/examples/widgets/widgets/imageviewer/imageviewer.h