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

        /****************************************************************************
        **
        ** Copyright (C) 2004-2006 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 "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();
        }