Qt 4.2: ftpwindow.cpp Example File (network/ftp/ftpwindow.cpp)

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

     /****************************************************************************
     **
     ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes 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), ftp(0)
     {
         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;
         fileList->setEnabled(false);

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

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

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

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

         buttonBox = new QDialogButtonBox;
         buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole);
         buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

         progressDialog = new QProgressDialog(this);

         connect(fileList, SIGNAL(itemActivated(QListWidgetItem *)),
                 this, SLOT(processItem(QListWidgetItem *)));
         connect(fileList, SIGNAL(currentItemChanged(QListWidgetItem *, QListWidgetItem *)),
                 this, SLOT(enableDownloadButton()));
         connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));
         connect(connectButton, SIGNAL(clicked()), this, SLOT(connectOrDisconnect()));
         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);
         topLayout->addWidget(connectButton);

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

         setWindowTitle(tr("FTP"));
     }

     void FtpWindow::connectOrDisconnect()
     {
         if (ftp) {
             ftp->abort();
             ftp->deleteLater();
             ftp = 0;
             fileList->setEnabled(false);
             cdToParentButton->setEnabled(false);
             downloadButton->setEnabled(false);
             connectButton->setEnabled(true);
             connectButton->setText(tr("Connect"));
             setCursor(Qt::ArrowCursor);
             return;
         }

         setCursor(Qt::WaitCursor);

         ftp = new QFtp(this);
         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)));

         fileList->clear();
         currentPath.clear();
         isDirectory.clear();

         ftp->connectToHost(ftpServerLineEdit->text());
         ftp->login();
         ftp->list();

         fileList->setEnabled(true);
         connectButton->setEnabled(false);
         connectButton->setText(tr("Disconnect"));
         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));
         downloadButton->setEnabled(false);
         progressDialog->exec();
     }

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

     void FtpWindow::ftpCommandFinished(int, bool error)
     {
         setCursor(Qt::ArrowCursor);

         if (ftp->currentCommand() == QFtp::ConnectToHost) {
             if (error) {
                 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()));
                 connectOrDisconnect();
                 return;
             }

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

         if (ftp->currentCommand() == QFtp::Get) {
             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) {
             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);
             setCursor(Qt::WaitCursor);
             return;
         }
     }

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