Long live Qt 4.5!

13 files changed, 1344 insertions, 0 deletions

diff --git a/examples/network/network-chat/chatdialog.cpp b/examples/network/network-chat/chatdialog.cpp
new file mode 100644
index 0000000..7e88e5b
--- /dev/null
+++ b/examples/network/network-chat/chatdialog.cpp
@@ -0,0 +1,141 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "chatdialog.h"
+
+ChatDialog::ChatDialog(QWidget *parent)
+    : QDialog(parent)
+{
+    setupUi(this);
+
+    lineEdit->setFocusPolicy(Qt::StrongFocus);
+    textEdit->setFocusPolicy(Qt::NoFocus);
+    textEdit->setReadOnly(true);
+    listWidget->setFocusPolicy(Qt::NoFocus);
+
+    connect(lineEdit, SIGNAL(returnPressed()), this, SLOT(returnPressed()));
+    connect(&client, SIGNAL(newMessage(const QString &, const QString &)),
+            this, SLOT(appendMessage(const QString &, const QString &)));
+    connect(&client, SIGNAL(newParticipant(const QString &)),
+            this, SLOT(newParticipant(const QString &)));
+    connect(&client, SIGNAL(participantLeft(const QString &)),
+            this, SLOT(participantLeft(const QString &)));
+
+    myNickName = client.nickName();
+    newParticipant(myNickName);
+    tableFormat.setBorder(0);
+    QTimer::singleShot(10 * 1000, this, SLOT(showInformation()));
+}
+
+void ChatDialog::appendMessage(const QString &from, const QString &message)
+{
+    if (from.isEmpty() || message.isEmpty())
+        return;
+
+    QTextCursor cursor(textEdit->textCursor());
+    cursor.movePosition(QTextCursor::End);
+    QTextTable *table = cursor.insertTable(1, 2, tableFormat);
+    table->cellAt(0, 0).firstCursorPosition().insertText("<" + from + "> ");
+    table->cellAt(0, 1).firstCursorPosition().insertText(message);
+    QScrollBar *bar = textEdit->verticalScrollBar();
+    bar->setValue(bar->maximum());
+}
+
+void ChatDialog::returnPressed()
+{
+    QString text = lineEdit->text();
+    if (text.isEmpty())
+        return;
+
+    if (text.startsWith(QChar('/'))) {
+        QColor color = textEdit->textColor();
+        textEdit->setTextColor(Qt::red);
+        textEdit->append(tr("! Unknown command: %1")
+                         .arg(text.left(text.indexOf(' '))));
+        textEdit->setTextColor(color);
+    } else {
+        client.sendMessage(text);
+        appendMessage(myNickName, text);
+    }
+
+    lineEdit->clear();
+}
+
+void ChatDialog::newParticipant(const QString &nick)
+{
+    if (nick.isEmpty())
+        return;
+
+    QColor color = textEdit->textColor();
+    textEdit->setTextColor(Qt::gray);
+    textEdit->append(tr("* %1 has joined").arg(nick));
+    textEdit->setTextColor(color);
+    listWidget->addItem(nick);
+}
+
+void ChatDialog::participantLeft(const QString &nick)
+{
+    if (nick.isEmpty())
+        return;
+
+    QList<QListWidgetItem *> items = listWidget->findItems(nick,
+                                                           Qt::MatchExactly);
+    if (items.isEmpty())
+        return;
+
+    delete items.at(0);
+    QColor color = textEdit->textColor();
+    textEdit->setTextColor(Qt::gray);
+    textEdit->append(tr("* %1 has left").arg(nick));
+    textEdit->setTextColor(color);
+}
+
+void ChatDialog::showInformation()
+{
+    if (listWidget->count() == 1) {
+        QMessageBox::information(this, tr("Chat"),
+                                 tr("Launch several instances of this "
+                                    "program on your local network and "
+                                    "start chatting!"));
+    }
+}
diff --git a/examples/network/network-chat/chatdialog.h b/examples/network/network-chat/chatdialog.h
new file mode 100644
index 0000000..552d794
--- /dev/null
+++ b/examples/network/network-chat/chatdialog.h
@@ -0,0 +1,70 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CHATDIALOG_H
+#define CHATDIALOG_H
+
+#include "ui_chatdialog.h"
+#include "client.h"
+
+class ChatDialog : public QDialog, private Ui::ChatDialog
+{
+    Q_OBJECT
+
+public:
+    ChatDialog(QWidget *parent = 0);
+
+public slots:
+    void appendMessage(const QString &from, const QString &message);
+
+private slots:
+    void returnPressed();
+    void newParticipant(const QString &nick);
+    void participantLeft(const QString &nick);
+    void showInformation();
+
+private:
+    Client client;
+    QString myNickName;
+    QTextTableFormat tableFormat;
+};
+
+#endif
diff --git a/examples/network/network-chat/chatdialog.ui b/examples/network/network-chat/chatdialog.ui
new file mode 100644
index 0000000..c85e0d0
--- /dev/null
+++ b/examples/network/network-chat/chatdialog.ui
@@ -0,0 +1,79 @@
+<ui version="4.0" >
+ <class>ChatDialog</class>
+ <widget class="QDialog" name="ChatDialog" >
+  <property name="geometry" >
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>513</width>
+    <height>349</height>
+   </rect>
+  </property>
+  <property name="windowTitle" >
+   <string>Chat</string>
+  </property>
+  <layout class="QVBoxLayout" >
+   <property name="margin" >
+    <number>9</number>
+   </property>
+   <property name="spacing" >
+    <number>6</number>
+   </property>
+   <item>
+    <layout class="QHBoxLayout" >
+     <property name="margin" >
+      <number>0</number>
+     </property>
+     <property name="spacing" >
+      <number>6</number>
+     </property>
+     <item>
+      <widget class="QTextEdit" name="textEdit" >
+       <property name="focusPolicy" >
+        <enum>Qt::NoFocus</enum>
+       </property>
+       <property name="readOnly" >
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QListWidget" name="listWidget" >
+       <property name="maximumSize" >
+        <size>
+         <width>180</width>
+         <height>16777215</height>
+        </size>
+       </property>
+       <property name="focusPolicy" >
+        <enum>Qt::NoFocus</enum>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" >
+     <property name="margin" >
+      <number>0</number>
+     </property>
+     <property name="spacing" >
+      <number>6</number>
+     </property>
+     <item>
+      <widget class="QLabel" name="label" >
+       <property name="text" >
+        <string>Message:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLineEdit" name="lineEdit" />
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/examples/network/network-chat/client.cpp b/examples/network/network-chat/client.cpp
new file mode 100644
index 0000000..d5931a6
--- /dev/null
+++ b/examples/network/network-chat/client.cpp
@@ -0,0 +1,140 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtNetwork>
+
+#include "client.h"
+#include "connection.h"
+#include "peermanager.h"
+
+Client::Client()
+{
+    peerManager = new PeerManager(this);
+    peerManager->setServerPort(server.serverPort());
+    peerManager->startBroadcasting();
+
+    QObject::connect(peerManager, SIGNAL(newConnection(Connection *)),
+                     this, SLOT(newConnection(Connection *)));
+    QObject::connect(&server, SIGNAL(newConnection(Connection *)),
+                     this, SLOT(newConnection(Connection *)));
+}
+
+void Client::sendMessage(const QString &message)
+{
+    if (message.isEmpty())
+        return;
+
+    QList<Connection *> connections = peers.values();
+    foreach (Connection *connection, connections)
+        connection->sendMessage(message);
+}
+
+QString Client::nickName() const
+{
+    return QString(peerManager->userName()) + "@" + QHostInfo::localHostName()
+           + ":" + QString::number(server.serverPort());
+}
+
+bool Client::hasConnection(const QHostAddress &senderIp, int senderPort) const
+{
+    if (senderPort == -1)
+        return peers.contains(senderIp);
+
+    if (!peers.contains(senderIp))
+        return false;
+
+    QList<Connection *> connections = peers.values(senderIp);
+    foreach (Connection *connection, connections) {
+        if (connection->peerPort() == senderPort)
+            return true;
+    }
+
+    return false;
+}
+
+void Client::newConnection(Connection *connection)
+{
+    connection->setGreetingMessage(peerManager->userName());
+
+    connect(connection, SIGNAL(error(QAbstractSocket::SocketError)),
+            this, SLOT(connectionError(QAbstractSocket::SocketError)));
+    connect(connection, SIGNAL(disconnected()), this, SLOT(disconnected()));
+    connect(connection, SIGNAL(readyForUse()), this, SLOT(readyForUse()));
+}
+
+void Client::readyForUse()
+{
+    Connection *connection = qobject_cast<Connection *>(sender());
+    if (!connection || hasConnection(connection->peerAddress(),
+                                     connection->peerPort()))
+        return;
+
+    connect(connection, SIGNAL(newMessage(const QString &, const QString &)),
+            this, SIGNAL(newMessage(const QString &, const QString &)));
+
+    peers.insert(connection->peerAddress(), connection);
+    QString nick = connection->name();
+    if (!nick.isEmpty())
+        emit newParticipant(nick);
+}
+
+void Client::disconnected()
+{
+    if (Connection *connection = qobject_cast<Connection *>(sender()))
+        removeConnection(connection);
+}
+
+void Client::connectionError(QAbstractSocket::SocketError /* socketError */)
+{
+    if (Connection *connection = qobject_cast<Connection *>(sender()))
+        removeConnection(connection);
+}
+
+void Client::removeConnection(Connection *connection)
+{
+    if (peers.contains(connection->peerAddress())) {
+        peers.remove(connection->peerAddress());
+        QString nick = connection->name();
+        if (!nick.isEmpty())
+            emit participantLeft(nick);
+    }
+    connection->deleteLater();
+}
diff --git a/examples/network/network-chat/client.h b/examples/network/network-chat/client.h
new file mode 100644
index 0000000..307df46
--- /dev/null
+++ b/examples/network/network-chat/client.h
@@ -0,0 +1,83 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CLIENT_H
+#define CLIENT_H
+
+#include <QAbstractSocket>
+#include <QHash>
+#include <QHostAddress>
+
+#include "server.h"
+
+class PeerManager;
+
+class Client : public QObject
+{
+    Q_OBJECT
+
+public:
+    Client();
+
+    void sendMessage(const QString &message);
+    QString nickName() const;
+    bool hasConnection(const QHostAddress &senderIp, int senderPort = -1) const;
+
+signals:
+    void newMessage(const QString &from, const QString &message);
+    void newParticipant(const QString &nick);
+    void participantLeft(const QString &nick);
+
+private slots:
+    void newConnection(Connection *connection);
+    void connectionError(QAbstractSocket::SocketError socketError);
+    void disconnected();
+    void readyForUse();
+
+private:
+    void removeConnection(Connection *connection);
+
+    PeerManager *peerManager;
+    Server server;
+    QMultiHash<QHostAddress, Connection *> peers;
+};
+
+#endif
diff --git a/examples/network/network-chat/connection.cpp b/examples/network/network-chat/connection.cpp
new file mode 100644
index 0000000..116ca3a
--- /dev/null
+++ b/examples/network/network-chat/connection.cpp
@@ -0,0 +1,276 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "connection.h"
+
+#include <QtNetwork>
+
+static const int TransferTimeout = 30 * 1000;
+static const int PongTimeout = 60 * 1000;
+static const int PingInterval = 5 * 1000;
+static const char SeparatorToken = ' ';
+
+Connection::Connection(QObject *parent)
+    : QTcpSocket(parent)
+{
+    greetingMessage = tr("undefined");
+    username = tr("unknown");
+    state = WaitingForGreeting;
+    currentDataType = Undefined;
+    numBytesForCurrentDataType = -1;
+    transferTimerId = 0;
+    isGreetingMessageSent = false;
+    pingTimer.setInterval(PingInterval);
+
+    QObject::connect(this, SIGNAL(readyRead()), this, SLOT(processReadyRead()));
+    QObject::connect(this, SIGNAL(disconnected()), &pingTimer, SLOT(stop()));
+    QObject::connect(&pingTimer, SIGNAL(timeout()), this, SLOT(sendPing()));
+    QObject::connect(this, SIGNAL(connected()),
+                     this, SLOT(sendGreetingMessage()));
+}
+
+QString Connection::name() const
+{
+    return username;
+}
+
+void Connection::setGreetingMessage(const QString &message)
+{
+    greetingMessage = message;
+}
+
+bool Connection::sendMessage(const QString &message)
+{
+    if (message.isEmpty())
+        return false;
+
+    QByteArray msg = message.toUtf8();
+    QByteArray data = "MESSAGE " + QByteArray::number(msg.size()) + " " + msg;
+    return write(data) == data.size();
+}
+
+void Connection::timerEvent(QTimerEvent *timerEvent)
+{
+    if (timerEvent->timerId() == transferTimerId) {
+        abort();
+        killTimer(transferTimerId);
+        transferTimerId = 0;
+    }
+}
+
+void Connection::processReadyRead()
+{
+    if (state == WaitingForGreeting) {
+        if (!readProtocolHeader())
+            return;
+        if (currentDataType != Greeting) {
+            abort();
+            return;
+        }
+        state = ReadingGreeting;
+    }
+
+    if (state == ReadingGreeting) {
+        if (!hasEnoughData())
+            return;
+
+        buffer = read(numBytesForCurrentDataType);
+        if (buffer.size() != numBytesForCurrentDataType) {
+            abort();
+            return;
+        }
+
+        username = QString(buffer) + "@" + peerAddress().toString() + ":"
+                   + QString::number(peerPort());
+        currentDataType = Undefined;
+        numBytesForCurrentDataType = 0;
+        buffer.clear();
+
+        if (!isValid()) {
+            abort();
+            return;
+        }
+
+        if (!isGreetingMessageSent)
+            sendGreetingMessage();
+
+        pingTimer.start();
+        pongTime.start();
+        state = ReadyForUse;
+        emit readyForUse();
+    }
+
+    do {
+        if (currentDataType == Undefined) {
+            if (!readProtocolHeader())
+                return;
+        }
+        if (!hasEnoughData())
+            return;
+        processData();
+    } while (bytesAvailable() > 0);
+}
+
+void Connection::sendPing()
+{
+    if (pongTime.elapsed() > PongTimeout) {
+        abort();
+        return;
+    }
+
+    write("PING 1 p");
+}
+
+void Connection::sendGreetingMessage()
+{
+    QByteArray greeting = greetingMessage.toUtf8();
+    QByteArray data = "GREETING " + QByteArray::number(greeting.size()) + " " + greeting;
+    if (write(data) == data.size())
+        isGreetingMessageSent = true;
+}
+
+int Connection::readDataIntoBuffer(int maxSize)
+{
+    if (maxSize > MaxBufferSize)
+        return 0;
+
+    int numBytesBeforeRead = buffer.size();
+    if (numBytesBeforeRead == MaxBufferSize) {
+        abort();
+        return 0;
+    }
+
+    while (bytesAvailable() > 0 && buffer.size() < maxSize) {
+        buffer.append(read(1));
+        if (buffer.endsWith(SeparatorToken))
+            break;
+    }
+    return buffer.size() - numBytesBeforeRead;
+}
+
+int Connection::dataLengthForCurrentDataType()
+{
+    if (bytesAvailable() <= 0 || readDataIntoBuffer() <= 0
+            || !buffer.endsWith(SeparatorToken))
+        return 0;
+
+    buffer.chop(1);
+    int number = buffer.toInt();
+    buffer.clear();
+    return number;
+}
+
+bool Connection::readProtocolHeader()
+{
+    if (transferTimerId) {
+        killTimer(transferTimerId);
+        transferTimerId = 0;
+    }
+
+    if (readDataIntoBuffer() <= 0) {
+        transferTimerId = startTimer(TransferTimeout);
+        return false;
+    }
+
+    if (buffer == "PING ") {
+        currentDataType = Ping;
+    } else if (buffer == "PONG ") {
+        currentDataType = Pong;
+    } else if (buffer == "MESSAGE ") {
+        currentDataType = PlainText;
+    } else if (buffer == "GREETING ") {
+        currentDataType = Greeting;
+    } else {
+        currentDataType = Undefined;
+        abort();
+        return false;
+    }
+
+    buffer.clear();
+    numBytesForCurrentDataType = dataLengthForCurrentDataType();
+    return true;
+}
+
+bool Connection::hasEnoughData()
+{
+    if (transferTimerId) {
+        QObject::killTimer(transferTimerId);
+        transferTimerId = 0;
+    }
+
+    if (numBytesForCurrentDataType <= 0)
+        numBytesForCurrentDataType = dataLengthForCurrentDataType();
+
+    if (bytesAvailable() < numBytesForCurrentDataType
+            || numBytesForCurrentDataType <= 0) {
+        transferTimerId = startTimer(TransferTimeout);
+        return false;
+    }
+
+    return true;
+}
+
+void Connection::processData()
+{
+    buffer = read(numBytesForCurrentDataType);
+    if (buffer.size() != numBytesForCurrentDataType) {
+        abort();
+        return;
+    }
+
+    switch (currentDataType) {
+    case PlainText:
+        emit newMessage(username, QString::fromUtf8(buffer));
+        break;
+    case Ping:
+        write("PONG 1 p");
+        break;
+    case Pong:
+        pongTime.restart();
+        break;
+    default:
+        break;
+    }
+
+    currentDataType = Undefined;
+    numBytesForCurrentDataType = 0;
+    buffer.clear();
+}
diff --git a/examples/network/network-chat/connection.h b/examples/network/network-chat/connection.h
new file mode 100644
index 0000000..0784154
--- /dev/null
+++ b/examples/network/network-chat/connection.h
@@ -0,0 +1,108 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CONNECTION_H
+#define CONNECTION_H
+
+#include <QHostAddress>
+#include <QString>
+#include <QTcpSocket>
+#include <QTime>
+#include <QTimer>
+
+static const int MaxBufferSize = 1024000;
+
+class Connection : public QTcpSocket
+{
+    Q_OBJECT
+
+public:
+    enum ConnectionState {
+        WaitingForGreeting,
+        ReadingGreeting,
+        ReadyForUse
+    };
+    enum DataType {
+        PlainText,
+        Ping,
+        Pong,
+        Greeting,
+        Undefined
+    };
+
+    Connection(QObject *parent = 0);
+
+    QString name() const;
+    void setGreetingMessage(const QString &message);
+    bool sendMessage(const QString &message);
+
+signals:
+    void readyForUse();
+    void newMessage(const QString &from, const QString &message);
+
+protected:
+    void timerEvent(QTimerEvent *timerEvent);
+
+private slots:
+    void processReadyRead();
+    void sendPing();
+    void sendGreetingMessage();
+
+private:
+    int readDataIntoBuffer(int maxSize = MaxBufferSize);
+    int dataLengthForCurrentDataType();
+    bool readProtocolHeader();
+    bool hasEnoughData();
+    void processData();
+
+    QString greetingMessage;
+    QString username;
+    QTimer pingTimer;
+    QTime pongTime;
+    QByteArray buffer;
+    ConnectionState state;
+    DataType currentDataType;
+    int numBytesForCurrentDataType;
+    int transferTimerId;
+    bool isGreetingMessageSent;
+};
+
+#endif
diff --git a/examples/network/network-chat/main.cpp b/examples/network/network-chat/main.cpp
new file mode 100644
index 0000000..ffe28c9
--- /dev/null
+++ b/examples/network/network-chat/main.cpp
@@ -0,0 +1,52 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QApplication>
+
+#include "chatdialog.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    ChatDialog dialog;
+    dialog.show();
+    return app.exec();
+}
diff --git a/examples/network/network-chat/network-chat.pro b/examples/network/network-chat/network-chat.pro
new file mode 100644
index 0000000..5d5efea
--- /dev/null
+++ b/examples/network/network-chat/network-chat.pro
@@ -0,0 +1,19 @@
+HEADERS       = chatdialog.h \
+                client.h \
+                connection.h \
+                peermanager.h \
+                server.h
+SOURCES       = chatdialog.cpp \
+                client.cpp \
+                connection.cpp \
+                main.cpp \
+                peermanager.cpp \
+                server.cpp
+FORMS         = chatdialog.ui
+QT           += network
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/network/network-chat
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS network-chat.pro *.chat
+sources.path = $$[QT_INSTALL_EXAMPLES]/network/network-chat
+INSTALLS += target sources
diff --git a/examples/network/network-chat/peermanager.cpp b/examples/network/network-chat/peermanager.cpp
new file mode 100644
index 0000000..4ed4c5a
--- /dev/null
+++ b/examples/network/network-chat/peermanager.cpp
@@ -0,0 +1,170 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtNetwork>
+
+#include "client.h"
+#include "connection.h"
+#include "peermanager.h"
+
+static const qint32 BroadcastInterval = 2000;
+static const unsigned broadcastPort = 45000;
+
+PeerManager::PeerManager(Client *client)
+    : QObject(client)
+{
+    this->client = client;
+
+    QStringList envVariables;
+    envVariables << "USERNAME.*" << "USER.*" << "USERDOMAIN.*"
+                 << "HOSTNAME.*" << "DOMAINNAME.*";
+
+    QStringList environment = QProcess::systemEnvironment();
+    foreach (QString string, envVariables) {
+        int index = environment.indexOf(QRegExp(string));
+        if (index != -1) {
+            QStringList stringList = environment.at(index).split("=");
+            if (stringList.size() == 2) {
+                username = stringList.at(1).toUtf8();
+                break;
+            }
+        }
+    }
+
+    if (username.isEmpty())
+        username = "unknown";
+
+    updateAddresses();
+    serverPort = 0;
+
+    broadcastSocket.bind(QHostAddress::Any, broadcastPort, QUdpSocket::ShareAddress
+                         | QUdpSocket::ReuseAddressHint);
+    connect(&broadcastSocket, SIGNAL(readyRead()),
+            this, SLOT(readBroadcastDatagram()));
+
+    broadcastTimer.setInterval(BroadcastInterval);
+    connect(&broadcastTimer, SIGNAL(timeout()),
+            this, SLOT(sendBroadcastDatagram()));
+}
+
+void PeerManager::setServerPort(int port)
+{
+    serverPort = port;
+}
+
+QByteArray PeerManager::userName() const
+{
+    return username;
+}
+
+void PeerManager::startBroadcasting()
+{
+    broadcastTimer.start();
+}
+
+bool PeerManager::isLocalHostAddress(const QHostAddress &address)
+{
+    foreach (QHostAddress localAddress, ipAddresses) {
+        if (address == localAddress)
+            return true;
+    }
+    return false;
+}
+
+void PeerManager::sendBroadcastDatagram()
+{
+    QByteArray datagram(username);
+    datagram.append('@');
+    datagram.append(QByteArray::number(serverPort));
+
+    bool validBroadcastAddresses = true;
+    foreach (QHostAddress address, broadcastAddresses) {
+        if (broadcastSocket.writeDatagram(datagram, address,
+                                          broadcastPort) == -1)
+            validBroadcastAddresses = false;
+    }
+
+    if (!validBroadcastAddresses)
+        updateAddresses();
+}
+
+void PeerManager::readBroadcastDatagram()
+{
+    while (broadcastSocket.hasPendingDatagrams()) {
+        QHostAddress senderIp;
+        quint16 senderPort;
+        QByteArray datagram;
+        datagram.resize(broadcastSocket.pendingDatagramSize());
+        if (broadcastSocket.readDatagram(datagram.data(), datagram.size(),
+                                         &senderIp, &senderPort) == -1)
+            continue;
+
+        QList<QByteArray> list = datagram.split('@');
+        if (list.size() != 2)
+            continue;
+
+        int senderServerPort = list.at(1).toInt();
+        if (isLocalHostAddress(senderIp) && senderServerPort == serverPort)
+            continue;
+
+        if (!client->hasConnection(senderIp)) {
+            Connection *connection = new Connection(this);
+            emit newConnection(connection);
+            connection->connectToHost(senderIp, senderServerPort);
+        }
+    }
+}
+
+void PeerManager::updateAddresses()
+{
+    broadcastAddresses.clear();
+    ipAddresses.clear();
+    foreach (QNetworkInterface interface, QNetworkInterface::allInterfaces()) {
+        foreach (QNetworkAddressEntry entry, interface.addressEntries()) {
+            QHostAddress broadcastAddress = entry.broadcast();
+            if (broadcastAddress != QHostAddress::Null &&
+                entry.ip() != QHostAddress::LocalHost) {
+                broadcastAddresses << broadcastAddress;
+                ipAddresses << entry.ip();
+            }
+        }
+    }
+}
diff --git a/examples/network/network-chat/peermanager.h b/examples/network/network-chat/peermanager.h
new file mode 100644
index 0000000..a729329
--- /dev/null
+++ b/examples/network/network-chat/peermanager.h
@@ -0,0 +1,85 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef PEERMANAGER_H
+#define PEERMANAGER_H
+
+#include <QByteArray>
+#include <QList>
+#include <QObject>
+#include <QTimer>
+#include <QUdpSocket>
+
+class Client;
+class Connection;
+
+class PeerManager : public QObject
+{
+    Q_OBJECT
+
+public:
+    PeerManager(Client *client);
+
+    void setServerPort(int port);
+    QByteArray userName() const;
+    void startBroadcasting();
+    bool isLocalHostAddress(const QHostAddress &address);
+
+signals:
+    void newConnection(Connection *connection);
+
+private slots:
+    void sendBroadcastDatagram();
+    void readBroadcastDatagram();
+
+private:
+    void updateAddresses();
+
+    Client *client;
+    QList<QHostAddress> broadcastAddresses;
+    QList<QHostAddress> ipAddresses;
+    QUdpSocket broadcastSocket;
+    QTimer broadcastTimer;
+    QByteArray username;
+    int serverPort;
+};
+
+#endif
diff --git a/examples/network/network-chat/server.cpp b/examples/network/network-chat/server.cpp
new file mode 100644
index 0000000..26f1e70
--- /dev/null
+++ b/examples/network/network-chat/server.cpp
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtNetwork>
+
+#include "connection.h"
+#include "server.h"
+
+Server::Server(QObject *parent)
+    : QTcpServer(parent)
+{
+    listen(QHostAddress::Any);
+}
+
+void Server::incomingConnection(int socketDescriptor)
+{
+    Connection *connection = new Connection(this);
+    connection->setSocketDescriptor(socketDescriptor);
+    emit newConnection(connection);
+}
diff --git a/examples/network/network-chat/server.h b/examples/network/network-chat/server.h
new file mode 100644
index 0000000..d297693
--- /dev/null
+++ b/examples/network/network-chat/server.h
@@ -0,0 +1,63 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SERVER_H
+#define SERVER_H
+
+#include <QTcpServer>
+
+class Connection;
+
+class Server : public QTcpServer
+{
+    Q_OBJECT
+
+public:
+    Server(QObject *parent = 0);
+
+signals:
+    void newConnection(Connection *connection);
+
+protected:
+    void incomingConnection(int socketDescriptor);
+};
+
+#endif