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#include <QtWidgets>
52
53class Notepad : public QMainWindow
54{
55 Q_OBJECT
56
57public:
58 Notepad();
59
60private slots:
61 void open();
62 void save();
63
64private:
65 QTextEdit *textEdit;
66
67 QAction *openAction;
68 QAction *saveAction;
69 QAction *exitAction;
70
71 QMenu *fileMenu;
72};
73
74Notepad::Notepad()
75{
76 openAction = new QAction(tr(s: "&Load"), this);
77 saveAction = new QAction(tr(s: "&Save"), this);
78 exitAction = new QAction(tr(s: "E&xit"), this);
79
80 connect(sender: openAction, signal: &QAction::triggered,
81 receiver: this, slot: &Notepad::open);
82 connect(sender: saveAction, signal: &QAction::triggered,
83 receiver: this, slot: &Notepad::save);
84 connect(sender: exitAction, signal: &QAction::triggered,
85 qApp, slot: &QApplication::quit);
86
87 fileMenu = menuBar()->addMenu(title: tr(s: "&File"));
88 fileMenu->addAction(action: openAction);
89 fileMenu->addAction(action: saveAction);
90 fileMenu->addSeparator();
91 fileMenu->addAction(action: exitAction);
92
93 textEdit = new QTextEdit;
94 setCentralWidget(textEdit);
95
96 setWindowTitle(tr(s: "Notepad"));
97}
98
99void Notepad::open()
100{
101 QString fileName = QFileDialog::getOpenFileName(parent: this, caption: tr(s: "Open File"), dir: "",
102 filter: tr(s: "Text Files (*.txt);;C++ Files (*.cpp *.h)"));
103
104 if (!fileName.isEmpty()) {
105 QFile file(fileName);
106 if (!file.open(flags: QIODevice::ReadOnly)) {
107 QMessageBox::critical(parent: this, title: tr(s: "Error"), text: tr(s: "Could not open file"));
108 return;
109 }
110 QTextStream in(&file);
111 textEdit->setText(in.readAll());
112 file.close();
113 }
114}
115
116void Notepad::save()
117{
118
119 QString fileName = QFileDialog::getSaveFileName(parent: this, caption: tr(s: "Save File"), dir: "",
120 filter: tr(s: "Text Files (*.txt);;C++ Files (*.cpp *.h)"));
121
122 if (!fileName.isEmpty()) {
123 QFile file(fileName);
124 if (!file.open(flags: QIODevice::WriteOnly)) {
125 // error message
126 } else {
127 QTextStream stream(&file);
128 stream << textEdit->toPlainText();
129 stream.flush();
130 file.close();
131 }
132 }
133}
134
135int main(int argc, char **argv)
136{
137 QApplication app(argc, argv);
138
139 Notepad notepad;
140 notepad.show();
141
142 return app.exec();
143}
144
145#include "main.moc"
146
147

source code of qtbase/examples/widgets/tutorials/gettingStarted/gsQt/part5/main.cpp