mainwindow.cpp Example File
network/torrent/mainwindow.cpp
#include <QtGui>
#include "addtorrentdialog.h"
#include "mainwindow.h"
#include "ratecontroller.h"
#include "torrentclient.h"
TorrentView extends QTreeWidget to allow drag and drop.
class TorrentView : public QTreeWidget
{
Q_OBJECT
public:
TorrentView(QWidget *parent = 0);
signals:
void fileDropped(const QString &fileName);
protected:
void dragMoveEvent(QDragMoveEvent *event);
void dropEvent(QDropEvent *event);
};
TorrentViewDelegate is used to draw the progress bars.
class TorrentViewDelegate : public QItemDelegate
{
Q_OBJECT
public:
inline TorrentViewDelegate(MainWindow *mainWindow) : QItemDelegate(mainWindow) {}
inline void paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index ) const
{
if (index.column() != 2) {
QItemDelegate::paint(painter, option, index);
return;
}
Set up a QStyleOptionProgressBar to precisely mimic the
environment of a progress bar.
QStyleOptionProgressBar progressBarOption;
progressBarOption.state = QStyle::State_Enabled;
progressBarOption.direction = QApplication::layoutDirection();
progressBarOption.rect = option.rect;
progressBarOption.fontMetrics = QApplication::fontMetrics();
progressBarOption.minimum = 0;
progressBarOption.maximum = 100;
progressBarOption.textAlignment = Qt::AlignCenter;
progressBarOption.textVisible = true;
Set the progress and text values of the style option.
int progress = qobject_cast<MainWindow *>(parent())->clientForRow(index.row())->progress();
progressBarOption.progress = progress < 0 ? 0 : progress;
progressBarOption.text = QString().sprintf("%d%%", progressBarOption.progress);
Draw the progress bar onto the view.
QApplication::style()->drawControl(QStyle::CE_ProgressBar, &progressBarOption, painter);
}
};
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), quitDialog(0), saveChanges(false)
{
Initialize some static strings
QStringList headers;
headers << tr("Torrent") << tr("Peers/Seeds") << tr("Progress")
<< tr("Down rate") << tr("Up rate") << tr("Status");
Main torrent list
torrentView = new TorrentView(this);
torrentView->setItemDelegate(new TorrentViewDelegate(this));
torrentView->setHeaderLabels(headers);
torrentView->setSelectionBehavior(QAbstractItemView::SelectRows);
torrentView->setAlternatingRowColors(true);
torrentView->setRootIsDecorated(false);
setCentralWidget(torrentView);
Set header resize modes and initial section sizes
QFontMetrics fm = fontMetrics();
QHeaderView *header = torrentView->header();
header->resizeSection(0, fm.width("typical-name-for-a-torrent.torrent"));
header->resizeSection(1, fm.width(headers.at(1) + " "));
header->resizeSection(2, fm.width(headers.at(2) + " "));
header->resizeSection(3, qMax(fm.width(headers.at(3) + " "), fm.width(" 1234.0 KB/s ")));
header->resizeSection(4, qMax(fm.width(headers.at(4) + " "), fm.width(" 1234.0 KB/s ")));
header->resizeSection(5, qMax(fm.width(headers.at(5) + " "), fm.width(tr("Downloading") + " ")));
Create common actions
QAction *newTorrentAction = new QAction(QIcon(":/icons/bottom.png"), tr("Add &new torrent"), this);
pauseTorrentAction = new QAction(QIcon(":/icons/player_pause.png"), tr("&Pause torrent"), this);
removeTorrentAction = new QAction(QIcon(":/icons/player_stop.png"), tr("&Remove torrent"), this);
File menu
QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(newTorrentAction);
fileMenu->addAction(pauseTorrentAction);
fileMenu->addAction(removeTorrentAction);
fileMenu->addSeparator();
fileMenu->addAction(QIcon(":/icons/exit.png"), tr("E&xit"), this, SLOT(close()));
Help menu
QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(tr("&About"), this, SLOT(about()));
helpMenu->addAction(tr("About &Qt"), qApp, SLOT(aboutQt()));
Top toolbar
QToolBar *topBar = new QToolBar(tr("Tools"));
addToolBar(Qt::TopToolBarArea, topBar);
topBar->setMovable(false);
topBar->addAction(newTorrentAction);
topBar->addAction(removeTorrentAction);
topBar->addAction(pauseTorrentAction);
topBar->addSeparator();
downActionTool = topBar->addAction(QIcon(tr(":/icons/1downarrow.png")), tr("Move down"));
upActionTool = topBar->addAction(QIcon(tr(":/icons/1uparrow.png")), tr("Move up"));
Bottom toolbar
QToolBar *bottomBar = new QToolBar(tr("Rate control"));
addToolBar(Qt::BottomToolBarArea, bottomBar);
bottomBar->setMovable(false);
downloadLimitSlider = new QSlider(Qt::Horizontal);
downloadLimitSlider->setRange(0, 1000);
bottomBar->addWidget(new QLabel(tr("Max download:")));
bottomBar->addWidget(downloadLimitSlider);
bottomBar->addWidget((downloadLimitLabel = new QLabel(tr("0 KB/s"))));
downloadLimitLabel->setFixedSize(QSize(fm.width(tr("99999 KB/s")), fm.lineSpacing()));
bottomBar->addSeparator();
uploadLimitSlider = new QSlider(Qt::Horizontal);
uploadLimitSlider->setRange(0, 1000);
bottomBar->addWidget(new QLabel(tr("Max upload:")));
bottomBar->addWidget(uploadLimitSlider);
bottomBar->addWidget((uploadLimitLabel = new QLabel(tr("0 KB/s"))));
uploadLimitLabel->setFixedSize(QSize(fm.width(tr("99999 KB/s")), fm.lineSpacing()));
Set up connections
connect(torrentView, SIGNAL(itemSelectionChanged()),
this, SLOT(setActionsEnabled()));
connect(torrentView, SIGNAL(fileDropped(const QString &)),
this, SLOT(acceptFileDrop(const QString &)));
connect(uploadLimitSlider, SIGNAL(valueChanged(int)),
this, SLOT(setUploadLimit(int)));
connect(downloadLimitSlider, SIGNAL(valueChanged(int)),
this, SLOT(setDownloadLimit(int)));
connect(newTorrentAction, SIGNAL(triggered()),
this, SLOT(addTorrent()));
connect(pauseTorrentAction, SIGNAL(triggered()),
this, SLOT(pauseTorrent()));
connect(removeTorrentAction, SIGNAL(triggered()),
this, SLOT(removeTorrent()));
connect(upActionTool, SIGNAL(triggered(bool)),
this, SLOT(moveTorrentUp()));
connect(downActionTool, SIGNAL(triggered(bool)),
this, SLOT(moveTorrentDown()));
Load settings and start
setWindowTitle(tr("Torrent Client"));
setActionsEnabled();
QMetaObject::invokeMethod(this, "loadSettings", Qt::QueuedConnection);
}
QSize MainWindow::sizeHint() const
{
const QHeaderView *header = torrentView->header();
Add up the sizes of all header sections. The last section is
stretched, so its size is relative to the size of the width;
instead of counting it, we count the size of its largest value.
int width = fontMetrics().width(tr("Downloading") + " ");
for (int i = 0; i < header->count() - 1; ++i)
width += header->sectionSize(i);
return QSize(width, QMainWindow::sizeHint().height())
.expandedTo(QApplication::globalStrut());
}
const TorrentClient *MainWindow::clientForRow(int row) const
{
Return the client at the given row.
return jobs.at(row).client;
}
int MainWindow::rowOfClient(TorrentClient *client) const
{
Return the row that displays this client's status, or -1 if the
client is not known.
int row = 0;
foreach (Job job, jobs) {
if (job.client == client)
return row;
++row;
}
return -1;
}
void MainWindow::loadSettings()
{
Load base settings (last working directory, upload/download limits).
QSettings settings("Trolltech", "Torrent");
lastDirectory = settings.value("LastDirectory").toString();
if (lastDirectory.isEmpty())
lastDirectory = QDir::currentPath();
int up = settings.value("UploadLimit").toInt();
int down = settings.value("DownloadLimit").toInt();
uploadLimitSlider->setValue(up ? up : 170);
downloadLimitSlider->setValue(down ? down : 550);
Resume all previous downloads.
int size = settings.beginReadArray("Torrents");
for (int i = 0; i < size; ++i) {
settings.setArrayIndex(i);
QByteArray resumeState = settings.value("resumeState").toByteArray();
QString fileName = settings.value("sourceFileName").toString();
QString dest = settings.value("destinationFolder").toString();
if (addTorrent(fileName, dest, resumeState)) {
TorrentClient *client = jobs.last().client;
client->setDownloadedBytes(settings.value("downloadedBytes").toLongLong());
client->setUploadedBytes(settings.value("uploadedBytes").toLongLong());
}
}
}
bool MainWindow::addTorrent()
{
Show the file dialog, let the user select what torrent to start downloading.
QString fileName = QFileDialog::getOpenFileName(this, tr("Choose a torrent file"),
lastDirectory,
tr("Torrents (*.torrent);;"
" All files (*.*)"));
if (fileName.isEmpty())
return false;
lastDirectory = QFileInfo(fileName).absolutePath();
Show the "Add Torrent" dialog.
AddTorrentDialog *addTorrentDialog = new AddTorrentDialog(this);
addTorrentDialog->setTorrent(fileName);
addTorrentDialog->deleteLater();
if (!addTorrentDialog->exec())
return false;
Add the torrent to our list of downloads
addTorrent(fileName, addTorrentDialog->destinationFolder());
if (!saveChanges) {
saveChanges = true;
QTimer::singleShot(1000, this, SLOT(saveSettings()));
}
return true;
}
void MainWindow::removeTorrent()
{
Find the row of the current item, and find the torrent client
for that row.
int row = torrentView->indexOfTopLevelItem(torrentView->currentItem());
TorrentClient *client = jobs.at(row).client;
Stop the client.
client->disconnect();
connect(client, SIGNAL(stopped()), this, SLOT(torrentStopped()));
client->stop();
Remove the row from the view.
delete torrentView->takeTopLevelItem(row);
jobs.removeAt(row);
setActionsEnabled();
saveChanges = true;
saveSettings();
}
void MainWindow::torrentStopped()
{
Schedule the client for deletion.
TorrentClient *client = qobject_cast<TorrentClient *>(sender());
client->deleteLater();
If the quit dialog is shown, update its progress.
if (quitDialog) {
if (++jobsStopped == jobsToStop)
quitDialog->close();
}
}
void MainWindow::torrentError(TorrentClient::Error)
{
Delete the client.
TorrentClient *client = qobject_cast<TorrentClient *>(sender());
int row = rowOfClient(client);
QString fileName = jobs.at(row).torrentFileName;
jobs.removeAt(row);
Display the warning.
QMessageBox::warning(this, tr("Error"),
tr("An error occurred while downloading %0: %1")
.arg(fileName)
.arg(client->errorString()));
delete torrentView->takeTopLevelItem(row);
client->deleteLater();
}
bool MainWindow::addTorrent(const QString &fileName, const QString &destinationFolder,
const QByteArray &resumeState)
{
Check if the torrent is already being downloaded.
foreach (Job job, jobs) {
if (job.torrentFileName == fileName && job.destinationDirectory == destinationFolder) {
QMessageBox::warning(this, tr("Already downloading"),
tr("The torrent file you have selected is "
"already being downloaded."));
return false;
}
}
Create a new torrent client and attempt to parse the torrent data.
TorrentClient *client = new TorrentClient(this);
if (!client->setTorrent(fileName)) {
QMessageBox::warning(this, tr("Error"),
tr("The torrent file you have selected can not be opened."));
delete client;
return false;
}
client->setDestinationFolder(destinationFolder);
client->setDumpedState(resumeState);
Setup the client connections.
connect(client, SIGNAL(stateChanged(TorrentClient::State)), this, SLOT(updateState(TorrentClient::State)));
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"
