Qt 4.0: blockingclient.cpp Example File (network/blockingfortuneclient/blockingclient.cpp)

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# blockingclient.cpp Example File
network/blockingfortuneclient/blockingclient.cpp

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        ** This file is part of the documentation of the Qt Toolkit.
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    ** and appearing in the file LICENSE.GPL included in the packaging of
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        #include <QtGui>
        #include <QtNetwork>

        #include "blockingclient.h"

        BlockingClient::BlockingClient(QWidget *parent)
            : QDialog(parent)
        {
            hostLabel = new QLabel(tr("&Server name:"));
            portLabel = new QLabel(tr("S&erver port:"));

            hostLineEdit = new QLineEdit("Localhost");
            portLineEdit = new QLineEdit;
            portLineEdit->setValidator(new QIntValidator(1, 65535, this));

            hostLabel->setBuddy(hostLineEdit);
            portLabel->setBuddy(portLineEdit);

            statusLabel = new QLabel(tr("This examples requires that you run the "
                                        "Fortune Server example as well."));

            getFortuneButton = new QPushButton(tr("Get Fortune"));
            getFortuneButton->setDefault(true);
            getFortuneButton->setEnabled(false);

            quitButton = new QPushButton(tr("Quit"));

            connect(hostLineEdit, SIGNAL(textChanged(const QString &)),
                    this, SLOT(enableGetFortuneButton()));
            connect(portLineEdit, SIGNAL(textChanged(const QString &)),
                    this, SLOT(enableGetFortuneButton()));
            connect(getFortuneButton, SIGNAL(clicked()),
                    this, SLOT(requestNewFortune()));
            connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
            connect(&thread, SIGNAL(newFortune(const QString &)),
                    this, SLOT(showFortune(const QString &)));
            connect(&thread, SIGNAL(error(int, const QString &)),
                    this, SLOT(displayError(int, const QString &)));

            QHBoxLayout *buttonLayout = new QHBoxLayout;
            buttonLayout->addStretch(1);
            buttonLayout->addWidget(getFortuneButton);
            buttonLayout->addWidget(quitButton);

            QGridLayout *mainLayout = new QGridLayout;
            mainLayout->addWidget(hostLabel, 0, 0);
            mainLayout->addWidget(hostLineEdit, 0, 1);
            mainLayout->addWidget(portLabel, 1, 0);
            mainLayout->addWidget(portLineEdit, 1, 1);
            mainLayout->addWidget(statusLabel, 2, 0, 1, 2);
            mainLayout->addLayout(buttonLayout, 3, 0, 1, 2);
            setLayout(mainLayout);

            setWindowTitle(tr("Blocking Fortune Client"));
            portLineEdit->setFocus();
        }

        void BlockingClient::requestNewFortune()
        {
            getFortuneButton->setEnabled(false);
            thread.requestNewFortune(hostLineEdit->text(),
                                     portLineEdit->text().toInt());
        }

        void BlockingClient::showFortune(const QString &nextFortune)
        {
            if (nextFortune == currentFortune) {
                requestNewFortune();
                return;
            }

            currentFortune = nextFortune;
            statusLabel->setText(currentFortune);
            getFortuneButton->setEnabled(true);
        }

        void BlockingClient::displayError(int socketError, const QString &message)
        {
            switch (socketError) {
            case QAbstractSocket::HostNotFoundError:
                QMessageBox::information(this, tr("Blocking Fortune Client"),
                                         tr("The host was not found. Please check the "
                                            "host and port settings."));
                break;
            case QAbstractSocket::ConnectionRefusedError:
                QMessageBox::information(this, tr("Blocking Fortune Client"),
                                         tr("The connection was refused by the peer. "
                                            "Make sure the fortune server is running, "
                                            "and check that the host name and port "
                                            "settings are correct."));
                break;
            default:
                QMessageBox::information(this, tr("Blocking Fortune Client"),
                                         tr("The following error occurred: %1.")
                                         .arg(message));
            }

            getFortuneButton->setEnabled(true);
        }

        void BlockingClient::enableGetFortuneButton()
        {
            getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()
                                         && !portLineEdit->text().isEmpty());
        }