- Qt 5.5
- Qt Network
- Torrent Example
- addtorrentdialog.cpp Example File
- Qt 5.5.1 Reference Documentation

# addtorrentdialog.cpp Example File

torrent/addtorrentdialog.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
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    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #include "addtorrentdialog.h"
    #include "metainfo.h"

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

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

    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(QString)),
                this, SLOT(setTorrent(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();
    }