#include "chatroom.h"ChatRoom::ChatRoom(QWidget *parent)    : QDialog(parent){	Layout();    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()));}ChatRoom::~ChatRoom(){}void ChatRoom::Layout(){	vboxLayout = new QVBoxLayout;    hboxLayout = new QHBoxLayout;    hboxLayout1 = new QHBoxLayout;    listWidget.setMaximumSize(QSize(180, 16777215));    hboxLayout->addWidget(&textEdit);    hboxLayout->addWidget(&listWidget);    vboxLayout->addLayout(hboxLayout);    label.setText(tr("Message:"));    hboxLayout1->addWidget(&label);    hboxLayout1->addWidget(&lineEdit);    vboxLayout->addLayout(hboxLayout1);    lineEdit.setFocusPolicy(Qt::StrongFocus);    textEdit.setFocusPolicy(Qt::NoFocus);    textEdit.setReadOnly(true);    listWidget.setFocusPolicy(Qt::NoFocus);    setLayout(vboxLayout);}void ChatRoom::createActions(){}void ChatRoom::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 ChatRoom::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 ChatRoom::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 ChatRoom::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 ChatRoom::showInformation(){    if (listWidget.count() == 1) {        QMessageBox::information(this, tr("Chat"),                                 tr("Launch several instances of this "                                    "program on your local network and "                                    "start chatting!"));    }}