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# chatdialog.cpp Example File
network/network-chat/chatdialog.cpp

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     #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!"));
         }
     }