bool DesignerExternalEditor::startEditor(const QString &fileName, QString *errorMessage)
{
EditorLaunchData data;
// Find the editor binary
if (!getEditorLaunchData(fileName, &QtSupport::BaseQtVersion::designerCommand,
QLatin1String(designerBinaryC),
QStringList(), false, &data, errorMessage)) {
return false;
}
// Known one?
const ProcessCache::iterator it = m_processCache.find(data.binary);
if (it != m_processCache.end()) {
// Process is known, write to its socket to cause it to open the file
if (debug)
qDebug() << Q_FUNC_INFO << "\nWriting to socket:" << data.binary << fileName;
QTcpSocket *socket = it.value();
if (!socket->write(fileName.toUtf8() + '\n')) {
*errorMessage = tr("Qt Designer is not responding (%1).").arg(socket->errorString());
return false;
}
return true;
}
// No process yet. Create socket & launch the process
QTcpServer server;
if (!server.listen(QHostAddress::LocalHost)) {
*errorMessage = tr("Unable to create server socket: %1").arg(server.errorString());
return false;
}
const quint16 port = server.serverPort();
if (debug)
qDebug() << Q_FUNC_INFO << "\nLaunching server:" << port << data.binary << fileName;
// Start first one with file and socket as '-client port file'
// Wait for the socket listening
data.arguments.push_front(QString::number(port));
data.arguments.push_front(QLatin1String("-client"));
if (!startEditorProcess(data, errorMessage))
return false;
// Set up signal mapper to track process termination via socket
if (!m_terminationMapper) {
m_terminationMapper = new QSignalMapper(this);
connect(m_terminationMapper, SIGNAL(mapped(QString)), this, SLOT(processTerminated(QString)));
}
// Insert into cache if socket is created, else try again next time
if (server.waitForNewConnection(3000)) {
QTcpSocket *socket = server.nextPendingConnection();
socket->setParent(this);
m_processCache.insert(data.binary, socket);
m_terminationMapper->setMapping(socket, data.binary);
connect(socket, SIGNAL(disconnected()), m_terminationMapper, SLOT(map()));
connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), m_terminationMapper, SLOT(map()));
}
return true;
}
void DesignerExternalEditor::processTerminated(const QString &binary)
{
const ProcessCache::iterator it = m_processCache.find(binary);
if (it == m_processCache.end())
return;
// Make sure socket is closed and cleaned, remove from cache
QTcpSocket *socket = it.value();
m_processCache.erase(it); // Note that closing will cause the slot to be retriggered
if (debug)
qDebug() << Q_FUNC_INFO << '\n' << binary << socket->state();
if (socket->state() == QAbstractSocket::ConnectedState)
socket->close();
socket->deleteLater();
}