mainwindow.cpp

基于QT4图形库的BT下载客户端源码

    connect(client, SIGNAL(peerInfoUpdated()), this, SLOT(updatePeerInfo()));
    connect(client, SIGNAL(progressUpdated(int)), this, SLOT(updateProgress(int)));
    connect(client, SIGNAL(downloadRateUpdated(int)), this, SLOT(updateDownloadRate(int)));
    connect(client, SIGNAL(uploadRateUpdated(int)), this, SLOT(updateUploadRate(int)));
    connect(client, SIGNAL(stopped()), this, SLOT(torrentStopped()));
    connect(client, SIGNAL(error(TorrentClient::Error)), this, SLOT(torrentError(TorrentClient::Error)));

    // Add the client to the list of downloading jobs.
    Job job;
    job.client = client;
    job.torrentFileName = fileName;
    job.destinationDirectory = destinationFolder;
    jobs << job;

    // Create and add a row in the torrent view for this download.
    QTreeWidgetItem *item = new QTreeWidgetItem(torrentView);

    QString baseFileName = QFileInfo(fileName).fileName();
    if (baseFileName.toLower().endsWith(".torrent"))
        baseFileName.remove(baseFileName.size() - 8);

    item->setText(0, baseFileName);
    item->setToolTip(0, tr("Torrent: %1<br>Destination: %2")
                     .arg(baseFileName).arg(destinationFolder));
    item->setText(1, tr("0/0"));
    item->setText(2, "0");
    item->setText(3, "0.0 KB/s");
    item->setText(4, "0.0 KB/s");
    item->setText(5, tr("Idle"));
    item->setFlags(item->flags() & ~Qt::ItemIsEditable);
    item->setTextAlignment(1, Qt::AlignHCenter);

    if (!saveChanges) {
        saveChanges = true;
        QTimer::singleShot(5000, this, SLOT(saveSettings()));
    }
    client->start();
    return true;
}

void MainWindow::saveSettings()
{
    if (!saveChanges)
      return;
    saveChanges = false;

    // Prepare and reset the settings
    QSettings settings("Trolltech", "Torrent");
    settings.clear();

    settings.setValue("LastDirectory", lastDirectory);
    settings.setValue("UploadLimit", uploadLimitSlider->value());
    settings.setValue("DownloadLimit", downloadLimitSlider->value());

    // Store data on all known torrents
    settings.beginWriteArray("Torrents");
    for (int i = 0; i < jobs.size(); ++i) {
        settings.setArrayIndex(i);
        settings.setValue("sourceFileName", jobs.at(i).torrentFileName);
        settings.setValue("destinationFolder", jobs.at(i).destinationDirectory);
        settings.setValue("uploadedBytes", jobs.at(i).client->uploadedBytes());
        settings.setValue("downloadedBytes", jobs.at(i).client->downloadedBytes());
        settings.setValue("resumeState", jobs.at(i).client->dumpedState());
    }
    settings.endArray();
    settings.sync();
}

void MainWindow::updateState(TorrentClient::State)
{
    // Update the state string whenever the client's state changes.
    TorrentClient *client = qobject_cast<TorrentClient *>(sender());
    int row = rowOfClient(client);
    QTreeWidgetItem *item = torrentView->topLevelItem(row);
    if (item) {
        item->setToolTip(0, tr("Torrent: %1<br>Destination: %2<br>State: %3")
                         .arg(jobs.at(row).torrentFileName)
                         .arg(jobs.at(row).destinationDirectory)
                         .arg(client->stateString()));

        item->setText(5, client->stateString());
    }
    setActionsEnabled();
}

void MainWindow::updatePeerInfo()
{
    // Update the number of connected, visited, seed and leecher peers.
    TorrentClient *client = qobject_cast<TorrentClient *>(sender());
    int row = rowOfClient(client);

    QTreeWidgetItem *item = torrentView->topLevelItem(row);
    item->setText(1, tr("%1/%2").arg(client->connectedPeerCount())
                  .arg(client->seedCount()));
}

void MainWindow::updateProgress(int percent)
{
    TorrentClient *client = qobject_cast<TorrentClient *>(sender());
    int row = rowOfClient(client);

    // Update the progressbar.
    QTreeWidgetItem *item = torrentView->topLevelItem(row);
    if (item)
        item->setText(2, QString::number(percent));
}

void MainWindow::setActionsEnabled()
{
    // Find the view item and client for the current row, and update
    // the states of the actions.
    QTreeWidgetItem *item = 0;
    if (!torrentView->selectedItems().isEmpty())
        item = torrentView->selectedItems().first();
    TorrentClient *client = item ? jobs.at(torrentView->indexOfTopLevelItem(item)).client : 0;
    bool pauseEnabled = client && ((client->state() == TorrentClient::Paused)
                                       ||  (client->state() > TorrentClient::Preparing));

    removeTorrentAction->setEnabled(item != 0);
    pauseTorrentAction->setEnabled(item != 0 && pauseEnabled);

    if (client && client->state() == TorrentClient::Paused) {
        pauseTorrentAction->setIcon(QIcon(":/icons/player_play.png"));
        pauseTorrentAction->setText(tr("Resume torrent"));
    } else {
        pauseTorrentAction->setIcon(QIcon(":/icons/player_pause.png"));
        pauseTorrentAction->setText(tr("Pause torrent"));
    }

    int row = torrentView->indexOfTopLevelItem(item);
    upActionTool->setEnabled(item && row != 0);
    downActionTool->setEnabled(item && row != jobs.size() - 1);
}

void MainWindow::updateDownloadRate(int bytesPerSecond)
{
    // Update the download rate.
    TorrentClient *client = qobject_cast<TorrentClient *>(sender());
    int row = rowOfClient(client);
    QString num;
    num.sprintf("%.1f KB/s", bytesPerSecond / 1024.0);
    torrentView->topLevelItem(row)->setText(3, num);

    if (!saveChanges) {
        saveChanges = true;
        QTimer::singleShot(5000, this, SLOT(saveSettings()));
    }
}

void MainWindow::updateUploadRate(int bytesPerSecond)
{
    // Update the upload rate.
    TorrentClient *client = qobject_cast<TorrentClient *>(sender());
    int row = rowOfClient(client);
    QString num;
    num.sprintf("%.1f KB/s", bytesPerSecond / 1024.0);
    torrentView->topLevelItem(row)->setText(4, num);

    if (!saveChanges) {
        saveChanges = true;
        QTimer::singleShot(5000, this, SLOT(saveSettings()));
    }
}

void MainWindow::pauseTorrent()
{
    // Pause or unpause the current torrent.
    int row = torrentView->indexOfTopLevelItem(torrentView->currentItem());
    TorrentClient *client = jobs.at(row).client;
    client->setPaused(client->state() != TorrentClient::Paused);
    setActionsEnabled();
}

void MainWindow::moveTorrentUp()
{
    QTreeWidgetItem *item = torrentView->currentItem();
    int row = torrentView->indexOfTopLevelItem(item);
    if (row == 0)
        return;

    Job tmp = jobs.at(row - 1);
    jobs[row - 1] = jobs[row];
    jobs[row] = tmp;

    QTreeWidgetItem *itemAbove = torrentView->takeTopLevelItem(row - 1);
    torrentView->insertTopLevelItem(row, itemAbove);
    setActionsEnabled();
}

void MainWindow::moveTorrentDown()
{
    QTreeWidgetItem *item = torrentView->currentItem();
    int row = torrentView->indexOfTopLevelItem(item);
    if (row == jobs.size() - 1)
        return;

    Job tmp = jobs.at(row + 1);
    jobs[row + 1] = jobs[row];
    jobs[row] = tmp;

    QTreeWidgetItem *itemAbove = torrentView->takeTopLevelItem(row + 1);
    torrentView->insertTopLevelItem(row, itemAbove);
    setActionsEnabled();
}

static int rateFromValue(int value)
{
    int rate = 0;
    if (value >= 0 && value < 250) {
        rate = 1 + int(value * 0.124);
    } else if (value < 500) {
        rate = 32 + int((value - 250) * 0.384);
    } else if (value < 750) {
        rate = 128 + int((value - 500) * 1.536);
    } else {
        rate = 512 + int((value - 750) * 6.1445);
    }
    return rate;
}

void MainWindow::setUploadLimit(int value)
{
    int rate = rateFromValue(value);
    uploadLimitLabel->setText(tr("%1 KB/s").arg(QString().sprintf("%4d", rate)));
    RateController::instance()->setUploadLimit(rate * 1024);
}

void MainWindow::setDownloadLimit(int value)
{
    int rate = rateFromValue(value);
    downloadLimitLabel->setText(tr("%1 KB/s").arg(QString().sprintf("%4d", rate)));
    RateController::instance()->setDownloadLimit(rate * 1024);
}

void MainWindow::about()
{
    QLabel *icon = new QLabel;
    icon->setPixmap(QPixmap(":/icons/peertopeer.png"));

    QLabel *text = new QLabel;
    text->setWordWrap(true);
    text->setText("<p>The <b>Torrent Client</b> example demonstrates how to"
                  " write a complete peer-to-peer file sharing"
                  " application using Qt's network and thread classes.</p>"
                  "<p>This feature complete client implementation of"
                  " the BitTorrent protocol can efficiently"
                  " maintain several hundred network connections"
                  " simultaneously.</p>");

    QPushButton *quitButton = new QPushButton("OK");

    QHBoxLayout *topLayout = new QHBoxLayout;
    topLayout->setMargin(10);
    topLayout->setSpacing(10);
    topLayout->addWidget(icon);
    topLayout->addWidget(text);

    QHBoxLayout *bottomLayout = new QHBoxLayout;
    bottomLayout->addStretch();
    bottomLayout->addWidget(quitButton);
    bottomLayout->addStretch();

    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addLayout(topLayout);
    mainLayout->addLayout(bottomLayout);

    QDialog about(this);
    about.setModal(true);
    about.setWindowTitle(tr("About Torrent Client"));
    about.setLayout(mainLayout);

    connect(quitButton, SIGNAL(clicked()), &about, SLOT(close()));

    about.exec();
}

void MainWindow::acceptFileDrop(const QString &fileName)
{
    // Create and show the "Add Torrent" dialog.
    AddTorrentDialog *addTorrentDialog = new AddTorrentDialog;
    lastDirectory = QFileInfo(fileName).absolutePath();
    addTorrentDialog->setTorrent(fileName);
    addTorrentDialog->deleteLater();
    if (!addTorrentDialog->exec())
        return;

    // Add the torrent to our list of downloads.
    addTorrent(fileName, addTorrentDialog->destinationFolder());
    saveSettings();
}

void MainWindow::closeEvent(QCloseEvent *)
{
    if (jobs.isEmpty())
        return;

    // Save upload / download numbers.
    saveSettings();
    saveChanges = false;

    quitDialog = new QProgressDialog(tr("Disconnecting from trackers"), tr("Abort"), 0, jobsToStop, this);

    // Stop all clients, remove the rows from the view and wait for
    // them to signal that they have stopped.
    jobsToStop = 0;
    jobsStopped = 0;
    foreach (Job job, jobs) {
        ++jobsToStop;
        TorrentClient *client = job.client;
        client->disconnect();
        connect(client, SIGNAL(stopped()), this, SLOT(torrentStopped()));
        client->stop();
        delete torrentView->takeTopLevelItem(0);
    }

    if (jobsToStop > jobsStopped)
        quitDialog->exec();
    quitDialog->deleteLater();
    quitDialog = 0;
}

TorrentView::TorrentView(QWidget *parent)
    : QTreeWidget(parent)
{
    setAcceptDrops(true);
}

void TorrentView::dragMoveEvent(QDragMoveEvent *event)
{
    // Accept file actions with a '.torrent' extension.
    QUrl url(event->mimeData()->text());
    if (url.isValid() && url.scheme().toLower() == "file"
            && url.path().toLower().endsWith(".torrent"))
        event->acceptProposedAction();
}

void TorrentView::dropEvent(QDropEvent *event)
{
    // Accept drops if the file has a '.torrent' extension and it
    // exists.
    QString fileName = QUrl(event->mimeData()->text()).path();
    if (QFile::exists(fileName) && fileName.toLower().endsWith(".torrent"))
        emit fileDropped(fileName);
}

#include "mainwindow.moc"