1 | /**************************************************************************** |
2 | ** |
3 | ** Copyright (C) 2017 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 | #include <QtNetwork> |
53 | |
54 | #include "client.h" |
55 | |
56 | //! [0] |
57 | Client::Client(QWidget *parent) |
58 | : QDialog(parent) |
59 | , hostCombo(new QComboBox) |
60 | , portLineEdit(new QLineEdit) |
61 | , getFortuneButton(new QPushButton(tr(s: "Get Fortune" ))) |
62 | , tcpSocket(new QTcpSocket(this)) |
63 | { |
64 | setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); |
65 | //! [0] |
66 | hostCombo->setEditable(true); |
67 | // find out name of this machine |
68 | QString name = QHostInfo::localHostName(); |
69 | if (!name.isEmpty()) { |
70 | hostCombo->addItem(atext: name); |
71 | QString domain = QHostInfo::localDomainName(); |
72 | if (!domain.isEmpty()) |
73 | hostCombo->addItem(atext: name + QChar('.') + domain); |
74 | } |
75 | if (name != QLatin1String("localhost" )) |
76 | hostCombo->addItem(atext: QString("localhost" )); |
77 | // find out IP addresses of this machine |
78 | QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses(); |
79 | // add non-localhost addresses |
80 | for (int i = 0; i < ipAddressesList.size(); ++i) { |
81 | if (!ipAddressesList.at(i).isLoopback()) |
82 | hostCombo->addItem(atext: ipAddressesList.at(i).toString()); |
83 | } |
84 | // add localhost addresses |
85 | for (int i = 0; i < ipAddressesList.size(); ++i) { |
86 | if (ipAddressesList.at(i).isLoopback()) |
87 | hostCombo->addItem(atext: ipAddressesList.at(i).toString()); |
88 | } |
89 | |
90 | portLineEdit->setValidator(new QIntValidator(1, 65535, this)); |
91 | |
92 | auto hostLabel = new QLabel(tr(s: "&Server name:" )); |
93 | hostLabel->setBuddy(hostCombo); |
94 | auto portLabel = new QLabel(tr(s: "S&erver port:" )); |
95 | portLabel->setBuddy(portLineEdit); |
96 | |
97 | statusLabel = new QLabel(tr(s: "This examples requires that you run the " |
98 | "Fortune Server example as well." )); |
99 | |
100 | getFortuneButton->setDefault(true); |
101 | getFortuneButton->setEnabled(false); |
102 | |
103 | auto quitButton = new QPushButton(tr(s: "Quit" )); |
104 | |
105 | auto buttonBox = new QDialogButtonBox; |
106 | buttonBox->addButton(button: getFortuneButton, role: QDialogButtonBox::ActionRole); |
107 | buttonBox->addButton(button: quitButton, role: QDialogButtonBox::RejectRole); |
108 | |
109 | //! [1] |
110 | in.setDevice(tcpSocket); |
111 | in.setVersion(QDataStream::Qt_4_0); |
112 | //! [1] |
113 | |
114 | connect(sender: hostCombo, signal: &QComboBox::editTextChanged, |
115 | receiver: this, slot: &Client::enableGetFortuneButton); |
116 | connect(sender: portLineEdit, signal: &QLineEdit::textChanged, |
117 | receiver: this, slot: &Client::enableGetFortuneButton); |
118 | connect(sender: getFortuneButton, signal: &QAbstractButton::clicked, |
119 | receiver: this, slot: &Client::requestNewFortune); |
120 | connect(sender: quitButton, signal: &QAbstractButton::clicked, receiver: this, slot: &QWidget::close); |
121 | //! [2] //! [3] |
122 | connect(sender: tcpSocket, signal: &QIODevice::readyRead, receiver: this, slot: &Client::readFortune); |
123 | //! [2] //! [4] |
124 | connect(sender: tcpSocket, signal: &QAbstractSocket::errorOccurred, |
125 | //! [3] |
126 | receiver: this, slot: &Client::displayError); |
127 | //! [4] |
128 | |
129 | QGridLayout *mainLayout = nullptr; |
130 | if (QGuiApplication::styleHints()->showIsFullScreen() || QGuiApplication::styleHints()->showIsMaximized()) { |
131 | auto outerVerticalLayout = new QVBoxLayout(this); |
132 | outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding)); |
133 | auto outerHorizontalLayout = new QHBoxLayout; |
134 | outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored)); |
135 | auto groupBox = new QGroupBox(QGuiApplication::applicationDisplayName()); |
136 | mainLayout = new QGridLayout(groupBox); |
137 | outerHorizontalLayout->addWidget(groupBox); |
138 | outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored)); |
139 | outerVerticalLayout->addLayout(layout: outerHorizontalLayout); |
140 | outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding)); |
141 | } else { |
142 | mainLayout = new QGridLayout(this); |
143 | } |
144 | mainLayout->addWidget(hostLabel, row: 0, column: 0); |
145 | mainLayout->addWidget(hostCombo, row: 0, column: 1); |
146 | mainLayout->addWidget(portLabel, row: 1, column: 0); |
147 | mainLayout->addWidget(portLineEdit, row: 1, column: 1); |
148 | mainLayout->addWidget(statusLabel, row: 2, column: 0, rowSpan: 1, columnSpan: 2); |
149 | mainLayout->addWidget(buttonBox, row: 3, column: 0, rowSpan: 1, columnSpan: 2); |
150 | |
151 | setWindowTitle(QGuiApplication::applicationDisplayName()); |
152 | portLineEdit->setFocus(); |
153 | //! [5] |
154 | } |
155 | //! [5] |
156 | |
157 | //! [6] |
158 | void Client::requestNewFortune() |
159 | { |
160 | getFortuneButton->setEnabled(false); |
161 | tcpSocket->abort(); |
162 | //! [7] |
163 | tcpSocket->connectToHost(hostName: hostCombo->currentText(), |
164 | port: portLineEdit->text().toInt()); |
165 | //! [7] |
166 | } |
167 | //! [6] |
168 | |
169 | //! [8] |
170 | void Client::readFortune() |
171 | { |
172 | in.startTransaction(); |
173 | |
174 | QString nextFortune; |
175 | in >> nextFortune; |
176 | |
177 | if (!in.commitTransaction()) |
178 | return; |
179 | |
180 | if (nextFortune == currentFortune) { |
181 | QTimer::singleShot(interval: 0, receiver: this, slot: &Client::requestNewFortune); |
182 | return; |
183 | } |
184 | |
185 | currentFortune = nextFortune; |
186 | statusLabel->setText(currentFortune); |
187 | getFortuneButton->setEnabled(true); |
188 | } |
189 | //! [8] |
190 | |
191 | //! [13] |
192 | void Client::displayError(QAbstractSocket::SocketError socketError) |
193 | { |
194 | switch (socketError) { |
195 | case QAbstractSocket::RemoteHostClosedError: |
196 | break; |
197 | case QAbstractSocket::HostNotFoundError: |
198 | QMessageBox::information(parent: this, title: tr(s: "Fortune Client" ), |
199 | text: tr(s: "The host was not found. Please check the " |
200 | "host name and port settings." )); |
201 | break; |
202 | case QAbstractSocket::ConnectionRefusedError: |
203 | QMessageBox::information(parent: this, title: tr(s: "Fortune Client" ), |
204 | text: tr(s: "The connection was refused by the peer. " |
205 | "Make sure the fortune server is running, " |
206 | "and check that the host name and port " |
207 | "settings are correct." )); |
208 | break; |
209 | default: |
210 | QMessageBox::information(parent: this, title: tr(s: "Fortune Client" ), |
211 | text: tr(s: "The following error occurred: %1." ) |
212 | .arg(a: tcpSocket->errorString())); |
213 | } |
214 | |
215 | getFortuneButton->setEnabled(true); |
216 | } |
217 | //! [13] |
218 | |
219 | void Client::enableGetFortuneButton() |
220 | { |
221 | getFortuneButton->setEnabled(!hostCombo->currentText().isEmpty() && |
222 | !portLineEdit->text().isEmpty()); |
223 | |
224 | } |
225 | |