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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.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** 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);
        }
    }