chatdialog.cpp Example File

network-chat/chatdialog.cpp
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#include <QtWidgets> #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(lineEdit, SIGNAL(returnPressed()), this, SLOT(returnPressed())); connect(&client, SIGNAL(newMessage(QString,QString)), this, SLOT(appendMessage(QString,QString))); connect(&client, SIGNAL(newParticipant(QString)), this, SLOT(newParticipant(QString))); connect(&client, SIGNAL(participantLeft(QString)), this, SLOT(participantLeft(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!")); } }