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

    /****************************************************************************
    **
    ** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #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!"));
        }
    }