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# addtorrentdialog.cpp Example File
network/torrent/addtorrentdialog.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 "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();
    }