Qt 4.0: ftpwindow.cpp Example File (network/ftp/ftpwindow.cpp)

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# ftpwindow.cpp Example File
network/ftp/ftpwindow.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
    ** http://www.trolltech.com/products/qt/licensing.html or contact the
    ** sales department at sales@trolltech.com.
        **
        ** 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 <QtNetwork>

        #include "ftpwindow.h"

        FtpWindow::FtpWindow(QWidget *parent)
            : QDialog(parent)
        {
            ftpServerLabel = new QLabel(tr("Ftp &server:"));
            ftpServerLineEdit = new QLineEdit("ftp.trolltech.com");
            ftpServerLabel->setBuddy(ftpServerLineEdit);

            statusLabel = new QLabel(tr("Please enter the name of an FTP server."));

            fileList = new QListWidget;

            connectButton = new QPushButton(tr("Connect"));
            connectButton->setDefault(true);

            downloadButton = new QPushButton(tr("Download"));
            downloadButton->setEnabled(false);

            cdToParentButton = new QPushButton;
            cdToParentButton->setIcon(QPixmap(":/images/cdtoparent.png"));
            cdToParentButton->setEnabled(false);

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

            ftp = new QFtp(this);

            progressDialog = new QProgressDialog(this);

            connect(ftpServerLineEdit, SIGNAL(textChanged(const QString &)),
                    this, SLOT(enableConnectButton()));
            connect(fileList, SIGNAL(itemDoubleClicked(QListWidgetItem *)),
                    this, SLOT(processItem(QListWidgetItem *)));
            connect(fileList, SIGNAL(itemEntered(QListWidgetItem *)),
                    this, SLOT(processItem(QListWidgetItem *)));
            connect(fileList, SIGNAL(itemSelectionChanged()),
                    this, SLOT(enableDownloadButton()));
            connect(ftp, SIGNAL(commandFinished(int, bool)),
                    this, SLOT(ftpCommandFinished(int, bool)));
            connect(ftp, SIGNAL(listInfo(const QUrlInfo &)),
                    this, SLOT(addToList(const QUrlInfo &)));
            connect(ftp, SIGNAL(dataTransferProgress(qint64, qint64)),
                    this, SLOT(updateDataTransferProgress(qint64, qint64)));
            connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));
            connect(connectButton, SIGNAL(clicked()), this, SLOT(connectToFtpServer()));
            connect(cdToParentButton, SIGNAL(clicked()), this, SLOT(cdToParent()));
            connect(downloadButton, SIGNAL(clicked()), this, SLOT(downloadFile()));
            connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

            QHBoxLayout *topLayout = new QHBoxLayout;
            topLayout->addWidget(ftpServerLabel);
            topLayout->addWidget(ftpServerLineEdit);
            topLayout->addWidget(cdToParentButton);

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

            QVBoxLayout *mainLayout = new QVBoxLayout;
            mainLayout->addLayout(topLayout);
            mainLayout->addWidget(fileList);
            mainLayout->addWidget(statusLabel);
            mainLayout->addLayout(buttonLayout);
            setLayout(mainLayout);

            setWindowTitle(tr("FTP"));
        }

        void FtpWindow::connectToFtpServer()
        {
            QApplication::setOverrideCursor(Qt::WaitCursor);
            ftp->connectToHost(ftpServerLineEdit->text());
            ftp->login();
            ftp->list();
            statusLabel->setText(tr("Connecting to FTP server %1...")
                                 .arg(ftpServerLineEdit->text()));
        }

        void FtpWindow::downloadFile()
        {
            QString fileName = fileList->currentItem()->text();

            if (QFile::exists(fileName)) {
                QMessageBox::information(this, tr("FTP"),
                                         tr("There already exists a file called %1 in "
                                            "the current directory.")
                                         .arg(fileName));
                return;
            }

            file = new QFile(fileName);
            if (!file->open(QIODevice::WriteOnly)) {
                QMessageBox::information(this, tr("FTP"),
                                         tr("Unable to save the file %1: %2.")
                                         .arg(fileName).arg(file->errorString()));
                delete file;
                return;
            }

            ftp->get(fileList->currentItem()->text(), file);

            progressDialog->setLabelText(tr("Downloading %1...").arg(fileName));
            progressDialog->show();
            downloadButton->setEnabled(false);
        }

        void FtpWindow::cancelDownload()
        {
            ftp->abort();
        }

        void FtpWindow::ftpCommandFinished(int, bool error)
        {
            if (ftp->currentCommand() == QFtp::ConnectToHost) {
                if (error) {
                    QApplication::restoreOverrideCursor();
                    QMessageBox::information(this, tr("FTP"),
                                             tr("Unable to connect to the FTP server "
                                                "at %1. Please check that the host "
                                                "name is correct.")
                                             .arg(ftpServerLineEdit->text()));
                    return;
                }

                statusLabel->setText(tr("Logged onto %1.")
                                     .arg(ftpServerLineEdit->text()));
                fileList->setFocus();
                connectButton->setEnabled(false);
                downloadButton->setDefault(true);
                return;
            }

            if (ftp->currentCommand() == QFtp::Get) {
                QApplication::restoreOverrideCursor();
                if (error) {
                    statusLabel->setText(tr("Canceled download of %1.")
                                         .arg(file->fileName()));
                    file->close();
                    file->remove();
                } else {
                    statusLabel->setText(tr("Downloaded %1 to current directory.")
                                         .arg(file->fileName()));
                    file->close();
                }
                delete file;
                enableDownloadButton();
            } else if (ftp->currentCommand() == QFtp::List) {
                QApplication::restoreOverrideCursor();
                if (isDirectory.isEmpty()) {
                    fileList->addItem(tr("<empty>"));
                    fileList->setEnabled(false);
                }
            }
        }

        void FtpWindow::addToList(const QUrlInfo &urlInfo)
        {
            QListWidgetItem *item = new QListWidgetItem;
            item->setText(urlInfo.name());
            QPixmap pixmap(urlInfo.isDir() ? ":/images/dir.png" : ":/images/file.png");
            item->setIcon(pixmap);

            isDirectory[urlInfo.name()] = urlInfo.isDir();
            fileList->addItem(item);
            if (!fileList->currentItem()) {
                fileList->setCurrentItem(fileList->item(0));
                fileList->setEnabled(true);
            }
        }

        void FtpWindow::processItem(QListWidgetItem *item)
        {
            QString name = item->text();
            if (isDirectory.value(name)) {
                fileList->clear();
                isDirectory.clear();
                currentPath += "/" + name;
                ftp->cd(name);
                ftp->list();
                cdToParentButton->setEnabled(true);
                QApplication::setOverrideCursor(Qt::WaitCursor);
                return;
            }
        }

        void FtpWindow::cdToParent()
        {
            QApplication::setOverrideCursor(Qt::WaitCursor);
            fileList->clear();
            isDirectory.clear();
            currentPath = currentPath.left(currentPath.lastIndexOf('/'));
            if (currentPath.isEmpty()) {
                cdToParentButton->setEnabled(false);
                ftp->cd("/");
            } else {
                ftp->cd(currentPath);
            }
            ftp->list();
        }

        void FtpWindow::updateDataTransferProgress(qint64 readBytes,
                                                   qint64 totalBytes)
        {
            progressDialog->setMaximum(totalBytes);
            progressDialog->setValue(readBytes);
        }

        void FtpWindow::enableConnectButton()
        {
            connectButton->setEnabled(!ftpServerLineEdit->text().isEmpty());
        }

        void FtpWindow::enableDownloadButton()
        {
            QListWidgetItem *current = fileList->currentItem();
            if (current) {
                QString currentFile = current->text();
                downloadButton->setEnabled(!isDirectory.value(currentFile));
            } else {
                downloadButton->setEnabled(false);
            }
        }