chat.cpp Example File

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  #include <QApplication>
  #include <QMessageBox>

  #include "chat.h"
  #include "chat_adaptor.h"
  #include "chat_interface.h"

  ChatMainWindow::ChatMainWindow()
      : m_nickname(QLatin1String("nickname"))
  {
      setupUi(this);
      sendButton->setEnabled(false);

      connect(messageLineEdit, SIGNAL(textChanged(QString)),
              this, SLOT(textChangedSlot(QString)));
      connect(sendButton, SIGNAL(clicked(bool)), this, SLOT(sendClickedSlot()));
      connect(actionChangeNickname, SIGNAL(triggered(bool)), this, SLOT(changeNickname()));
      connect(actionAboutQt, SIGNAL(triggered(bool)), this, SLOT(aboutQt()));
      connect(qApp, SIGNAL(lastWindowClosed()), this, SLOT(exiting()));

      // add our D-Bus interface and connect to D-Bus
      new ChatAdaptor(this);
      QDBusConnection::sessionBus().registerObject("/", this);

      org::example::chat *iface;
      iface = new org::example::chat(QString(), QString(), QDBusConnection::sessionBus(), this);
      //connect(iface, SIGNAL(message(QString,QString)), this, SLOT(messageSlot(QString,QString)));
      QDBusConnection::sessionBus().connect(QString(), QString(), "org.example.chat", "message", this, SLOT(messageSlot(QString,QString)));
      connect(iface, SIGNAL(action(QString,QString)), this, SLOT(actionSlot(QString,QString)));

      NicknameDialog dialog;
      dialog.cancelButton->setVisible(false);
      dialog.exec();
      m_nickname = dialog.nickname->text().trimmed();
      emit action(m_nickname, QLatin1String("joins the chat"));
  }

  ChatMainWindow::~ChatMainWindow()
  {
  }

  void ChatMainWindow::rebuildHistory()
  {
      QString history = m_messages.join( QLatin1String("\n" ) );
      chatHistory->setPlainText(history);
  }

  void ChatMainWindow::messageSlot(const QString &nickname, const QString &text)
  {
      QString msg( QLatin1String("<%1> %2") );
      msg = msg.arg(nickname, text);
      m_messages.append(msg);

      if (m_messages.count() > 100)
          m_messages.removeFirst();
      rebuildHistory();
  }

  void ChatMainWindow::actionSlot(const QString &nickname, const QString &text)
  {
      QString msg( QLatin1String("* %1 %2") );
      msg = msg.arg(nickname, text);
      m_messages.append(msg);

      if (m_messages.count() > 100)
          m_messages.removeFirst();
      rebuildHistory();
  }

  void ChatMainWindow::textChangedSlot(const QString &newText)
  {
      sendButton->setEnabled(!newText.isEmpty());
  }

  void ChatMainWindow::sendClickedSlot()
  {
      //emit message(m_nickname, messageLineEdit->text());
      QDBusMessage msg = QDBusMessage::createSignal("/", "org.example.chat", "message");
      msg << m_nickname << messageLineEdit->text();
      QDBusConnection::sessionBus().send(msg);
      messageLineEdit->setText(QString());
  }

  void ChatMainWindow::changeNickname()
  {
      NicknameDialog dialog(this);
      if (dialog.exec() == QDialog::Accepted) {
          QString old = m_nickname;
          m_nickname = dialog.nickname->text().trimmed();
          emit action(old, QString("is now known as %1").arg(m_nickname));
      }
  }

  void ChatMainWindow::aboutQt()
  {
      QMessageBox::aboutQt(this);
  }

  void ChatMainWindow::exiting()
  {
      emit action(m_nickname, QLatin1String("leaves the chat"));
  }

  NicknameDialog::NicknameDialog(QWidget *parent)
      : QDialog(parent)
  {
      setupUi(this);
  }

  int main(int argc, char **argv)
  {
      QApplication app(argc, argv);

      if (!QDBusConnection::sessionBus().isConnected()) {
          qWarning("Cannot connect to the D-Bus session bus.\n"
                   "Please check your system settings and try again.\n");
          return 1;
      }

      ChatMainWindow chat;
      chat.show();
      return app.exec();
  }