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# addtorrentdialog.cpp Example File
network/torrent/addtorrentdialog.cpp

     /****************************************************************************
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     ** Contact: Qt Software Information (qt-info@nokia.com)
     **
     ** This file is part of the example classes of the Qt Toolkit.
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     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License versions 2.0 or 3.0 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
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     #include "addtorrentdialog.h"
     #include "metainfo.h"

     #include <QFile>
     #include <QFileDialog>
     #include <QLineEdit>
     #include <QMetaObject>

     static QString stringNumber(qint64 number)
     {
         QString tmp;
         if (number > (1024 * 1024 * 1024))
             tmp.sprintf("%.2fGB", number / (1024.0 * 1024.0 * 1024.0));
         else if (number > (1024 * 1024))
             tmp.sprintf("%.2fMB", number / (1024.0 * 1024.0));
         else if (number > (1024))
             tmp.sprintf("%.2fKB", number / (1024.0));
         else
             tmp.sprintf("%d bytes", int(number));
         return tmp;
     }

     AddTorrentDialog::AddTorrentDialog(QWidget *parent)
       : QDialog(parent, Qt::Sheet)
     {
         ui.setupUi(this);

         connect(ui.browseTorrents, SIGNAL(clicked()),
                 this, SLOT(selectTorrent()));
         connect(ui.browseDestination, SIGNAL(clicked()),
                 this, SLOT(selectDestination()));
         connect(ui.torrentFile, SIGNAL(textChanged(const QString &)),
                 this, SLOT(setTorrent(const QString &)));

         ui.destinationFolder->setText(destinationDirectory = QDir::current().path());
         ui.torrentFile->setFocus();
     }

     void AddTorrentDialog::selectTorrent()
     {
         QString fileName = QFileDialog::getOpenFileName(this, tr("Choose a torrent file"),
                                                         lastDirectory,
                                                         tr("Torrents (*.torrent);; All files (*.*)"));
         if (fileName.isEmpty())
             return;
         lastDirectory = QFileInfo(fileName).absolutePath();
         setTorrent(fileName);
     }

     void AddTorrentDialog::selectDestination()
     {
         QString dir = QFileDialog::getExistingDirectory(this, tr("Choose a destination directory"),
                                                         lastDestinationDirectory);
         if (dir.isEmpty())
             return;
         lastDestinationDirectory = destinationDirectory = dir;
         ui.destinationFolder->setText(destinationDirectory);
         enableOkButton();
     }

     void AddTorrentDialog::enableOkButton()
     {
         ui.okButton->setEnabled(!ui.destinationFolder->text().isEmpty()
                                 && !ui.torrentFile->text().isEmpty());
     }

     void AddTorrentDialog::setTorrent(const QString &torrentFile)
     {
         if (torrentFile.isEmpty()) {
             enableOkButton();
             return;
         }

         ui.torrentFile->setText(torrentFile);
         if (!torrentFile.isEmpty())
             lastDirectory = QFileInfo(torrentFile).absolutePath();

         if (lastDestinationDirectory.isEmpty())
             lastDestinationDirectory = lastDirectory;

         MetaInfo metaInfo;
         QFile torrent(torrentFile);
         if (!torrent.open(QFile::ReadOnly) || !metaInfo.parse(torrent.readAll())) {
             enableOkButton();
             return;
         }

         ui.torrentFile->setText(torrentFile);
         ui.announceUrl->setText(metaInfo.announceUrl());
         if (metaInfo.comment().isEmpty())
             ui.commentLabel->setText("<unknown>");
         else
             ui.commentLabel->setText(metaInfo.comment());
         if (metaInfo.createdBy().isEmpty())
             ui.creatorLabel->setText("<unknown>");
         else
             ui.creatorLabel->setText(metaInfo.createdBy());
         ui.sizeLabel->setText(stringNumber(metaInfo.totalSize()));
         if (metaInfo.fileForm() == MetaInfo::SingleFileForm) {
             ui.torrentContents->setHtml(metaInfo.singleFile().name);
         } else {
             QString html;
             foreach (MetaInfoMultiFile file, metaInfo.multiFiles()) {
                 QString name = metaInfo.name();
                 if (!name.isEmpty()) {
                     html += name;
                     if (!name.endsWith('/'))
                         html += '/';
                 }
                 html += file.path + "<br>";
             }
             ui.torrentContents->setHtml(html);
         }

         QFileInfo info(torrentFile);
         ui.destinationFolder->setText(info.absolutePath());

         enableOkButton();
     }

     QString AddTorrentDialog::torrentFileName() const
     {
         return ui.torrentFile->text();
     }

     QString AddTorrentDialog::destinationFolder() const
     {
         return ui.destinationFolder->text();
     }