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Branched from the monolithic repo, Qt master branch, at commit
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1 files changed, 753 insertions, 0 deletions

diff --git a/src/declarative/qml/qdeclarativeworkerscript.cpp b/src/declarative/qml/qdeclarativeworkerscript.cpp
new file mode 100644
index 0000000000..db8a2ae81b
--- /dev/null
+++ b/src/declarative/qml/qdeclarativeworkerscript.cpp
@@ -0,0 +1,753 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "private/qdeclarativeworkerscript_p.h"
+#include "private/qdeclarativelistmodel_p.h"
+#include "private/qdeclarativelistmodelworkeragent_p.h"
+#include "private/qdeclarativeengine_p.h"
+#include "private/qdeclarativeexpression_p.h"
+
+#include <QtCore/qcoreevent.h>
+#include <QtCore/qcoreapplication.h>
+#include <QtCore/qdebug.h>
+#include <QtScript/qscriptengine.h>
+#include <QtCore/qmutex.h>
+#include <QtCore/qwaitcondition.h>
+#include <QtScript/qscriptvalueiterator.h>
+#include <QtCore/qfile.h>
+#include <QtCore/qdatetime.h>
+#include <QtNetwork/qnetworkaccessmanager.h>
+#include <QtDeclarative/qdeclarativeinfo.h>
+#include "qdeclarativenetworkaccessmanagerfactory.h"
+
+
+QT_BEGIN_NAMESPACE
+
+class WorkerDataEvent : public QEvent
+{
+public:
+    enum Type { WorkerData = QEvent::User };
+
+    WorkerDataEvent(int workerId, const QVariant &data);
+    virtual ~WorkerDataEvent();
+
+    int workerId() const;
+    QVariant data() const;
+
+private:
+    int m_id;
+    QVariant m_data;
+};
+
+class WorkerLoadEvent : public QEvent
+{
+public:
+    enum Type { WorkerLoad = WorkerDataEvent::WorkerData + 1 };
+
+    WorkerLoadEvent(int workerId, const QUrl &url);
+
+    int workerId() const;
+    QUrl url() const;
+
+private:
+    int m_id;
+    QUrl m_url;
+};
+
+class WorkerRemoveEvent : public QEvent
+{
+public:
+    enum Type { WorkerRemove = WorkerLoadEvent::WorkerLoad + 1 };
+
+    WorkerRemoveEvent(int workerId);
+
+    int workerId() const;
+
+private:
+    int m_id;
+};
+
+class WorkerErrorEvent : public QEvent
+{
+public:
+    enum Type { WorkerError = WorkerRemoveEvent::WorkerRemove + 1 };
+
+    WorkerErrorEvent(const QDeclarativeError &error);
+
+    QDeclarativeError error() const;
+
+private:
+    QDeclarativeError m_error;
+};
+
+class QDeclarativeWorkerScriptEnginePrivate : public QObject
+{
+    Q_OBJECT
+public:
+    enum WorkerEventTypes {
+        WorkerDestroyEvent = QEvent::User + 100
+    };
+
+    QDeclarativeWorkerScriptEnginePrivate(QDeclarativeEngine *eng);
+
+    struct ScriptEngine : public QDeclarativeScriptEngine
+    {
+        ScriptEngine(QDeclarativeWorkerScriptEnginePrivate *parent) : QDeclarativeScriptEngine(0), p(parent), accessManager(0) {}
+        ~ScriptEngine() { delete accessManager; }
+        QDeclarativeWorkerScriptEnginePrivate *p;
+        QNetworkAccessManager *accessManager;
+
+        virtual QNetworkAccessManager *networkAccessManager() {
+            if (!accessManager) {
+                if (p->qmlengine && p->qmlengine->networkAccessManagerFactory()) {
+                    accessManager = p->qmlengine->networkAccessManagerFactory()->create(this);
+                } else {
+                    accessManager = new QNetworkAccessManager(this);
+                }
+            }
+            return accessManager;
+        }
+    };
+    ScriptEngine *workerEngine;
+    static QDeclarativeWorkerScriptEnginePrivate *get(QScriptEngine *e) {
+        return static_cast<ScriptEngine *>(e)->p;
+    }
+
+    QDeclarativeEngine *qmlengine;
+
+    QMutex m_lock;
+    QWaitCondition m_wait;
+
+    struct WorkerScript {
+        WorkerScript();
+
+        int id;
+        QUrl source;
+        bool initialized;
+        QDeclarativeWorkerScript *owner;
+        QScriptValue object;
+
+        QScriptValue callback;
+    };
+
+    QHash<int, WorkerScript *> workers;
+    QScriptValue getWorker(int);
+
+    int m_nextId;
+
+    static QVariant scriptValueToVariant(const QScriptValue &);
+    static QScriptValue variantToScriptValue(const QVariant &, QScriptEngine *);
+
+    static QScriptValue onMessage(QScriptContext *ctxt, QScriptEngine *engine);
+    static QScriptValue sendMessage(QScriptContext *ctxt, QScriptEngine *engine);
+
+signals:
+    void stopThread();
+
+protected:
+    virtual bool event(QEvent *);
+
+private:
+    void processMessage(int, const QVariant &);
+    void processLoad(int, const QUrl &);
+    void reportScriptException(WorkerScript *);
+};
+
+QDeclarativeWorkerScriptEnginePrivate::QDeclarativeWorkerScriptEnginePrivate(QDeclarativeEngine *engine)
+: workerEngine(0), qmlengine(engine), m_nextId(0)
+{
+}
+
+QScriptValue QDeclarativeWorkerScriptEnginePrivate::onMessage(QScriptContext *ctxt, QScriptEngine *engine)
+{
+    QDeclarativeWorkerScriptEnginePrivate *p = QDeclarativeWorkerScriptEnginePrivate::get(engine);
+
+    int id = ctxt->thisObject().data().toVariant().toInt();
+
+    WorkerScript *script = p->workers.value(id);
+    if (!script)
+        return engine->undefinedValue();
+
+    if (ctxt->argumentCount() >= 1) 
+        script->callback = ctxt->argument(0);
+
+    return script->callback;
+}
+
+QScriptValue QDeclarativeWorkerScriptEnginePrivate::sendMessage(QScriptContext *ctxt, QScriptEngine *engine)
+{
+    if (!ctxt->argumentCount())
+        return engine->undefinedValue();
+
+    QDeclarativeWorkerScriptEnginePrivate *p = QDeclarativeWorkerScriptEnginePrivate::get(engine);
+
+    int id = ctxt->thisObject().data().toVariant().toInt();
+
+    WorkerScript *script = p->workers.value(id);
+    if (!script)
+        return engine->undefinedValue();
+
+    QMutexLocker(&p->m_lock);
+
+    if (script->owner)
+        QCoreApplication::postEvent(script->owner,
+                                    new WorkerDataEvent(0, scriptValueToVariant(ctxt->argument(0))));
+
+    return engine->undefinedValue();
+}
+
+QScriptValue QDeclarativeWorkerScriptEnginePrivate::getWorker(int id)
+{
+    QHash<int, WorkerScript *>::ConstIterator iter = workers.find(id);
+
+    if (iter == workers.end())
+        return workerEngine->nullValue();
+
+    WorkerScript *script = *iter;
+    if (!script->initialized) {
+
+        script->initialized = true;
+        script->object = workerEngine->newObject();
+
+        QScriptValue api = workerEngine->newObject();
+        api.setData(script->id);
+
+        api.setProperty(QLatin1String("onMessage"), workerEngine->newFunction(onMessage),
+                        QScriptValue::PropertyGetter | QScriptValue::PropertySetter);
+        api.setProperty(QLatin1String("sendMessage"), workerEngine->newFunction(sendMessage));
+
+        script->object.setProperty(QLatin1String("WorkerScript"), api);
+    }
+
+    return script->object;
+}
+
+bool QDeclarativeWorkerScriptEnginePrivate::event(QEvent *event)
+{
+    if (event->type() == (QEvent::Type)WorkerDataEvent::WorkerData) {
+        WorkerDataEvent *workerEvent = static_cast<WorkerDataEvent *>(event);
+        processMessage(workerEvent->workerId(), workerEvent->data());
+        return true;
+    } else if (event->type() == (QEvent::Type)WorkerLoadEvent::WorkerLoad) {
+        WorkerLoadEvent *workerEvent = static_cast<WorkerLoadEvent *>(event);
+        processLoad(workerEvent->workerId(), workerEvent->url());
+        return true;
+    } else if (event->type() == (QEvent::Type)WorkerDestroyEvent) {
+        emit stopThread();
+        return true;
+    } else {
+        return QObject::event(event);
+    }
+}
+
+void QDeclarativeWorkerScriptEnginePrivate::processMessage(int id, const QVariant &data)
+{
+    WorkerScript *script = workers.value(id);
+    if (!script)
+        return;
+
+    if (script->callback.isFunction()) {
+        QScriptValue args = workerEngine->newArray(1);
+        args.setProperty(0, variantToScriptValue(data, workerEngine));
+
+        script->callback.call(script->object, args);
+
+        if (workerEngine->hasUncaughtException()) {
+            reportScriptException(script);
+            workerEngine->clearExceptions();
+        }
+    }
+}
+
+void QDeclarativeWorkerScriptEnginePrivate::processLoad(int id, const QUrl &url)
+{
+    if (url.isRelative())
+        return;
+
+    QString fileName = QDeclarativeEnginePrivate::urlToLocalFileOrQrc(url);
+
+    QFile f(fileName);
+    if (f.open(QIODevice::ReadOnly)) {
+        QByteArray data = f.readAll();
+        QString sourceCode = QString::fromUtf8(data);
+
+        QScriptValue activation = getWorker(id);
+
+        QScriptContext *ctxt = QScriptDeclarativeClass::pushCleanContext(workerEngine);
+        QScriptValue urlContext = workerEngine->newObject();
+        urlContext.setData(QScriptValue(workerEngine, url.toString()));
+        ctxt->pushScope(urlContext);
+        ctxt->pushScope(activation);
+        ctxt->setActivationObject(activation);
+        QDeclarativeScriptParser::extractPragmas(sourceCode);
+
+        workerEngine->baseUrl = url;
+        workerEngine->evaluate(sourceCode);
+
+        WorkerScript *script = workers.value(id);
+        if (script) {
+            script->source = url;
+            if (workerEngine->hasUncaughtException()) {
+                reportScriptException(script);
+                workerEngine->clearExceptions();
+            }
+        }
+
+        workerEngine->popContext();
+    } else {
+        qWarning().nospace() << "WorkerScript: Cannot find source file " << url.toString();
+    }
+}
+
+void QDeclarativeWorkerScriptEnginePrivate::reportScriptException(WorkerScript *script)
+{
+    if (!script || !workerEngine->hasUncaughtException())
+        return;
+
+    QDeclarativeError error;
+    QDeclarativeExpressionPrivate::exceptionToError(workerEngine, error);
+    error.setUrl(script->source);
+
+    QDeclarativeWorkerScriptEnginePrivate *p = QDeclarativeWorkerScriptEnginePrivate::get(workerEngine);
+
+    QMutexLocker(&p->m_lock);
+    if (script->owner)
+        QCoreApplication::postEvent(script->owner, new WorkerErrorEvent(error));
+}
+
+QVariant QDeclarativeWorkerScriptEnginePrivate::scriptValueToVariant(const QScriptValue &value)
+{
+    if (value.isBool()) {
+        return QVariant(value.toBool());
+    } else if (value.isString()) {
+        return QVariant(value.toString());
+    } else if (value.isNumber()) {
+        return QVariant((qreal)value.toNumber());
+    } else if (value.isDate()) {
+        return QVariant(value.toDateTime());
+#ifndef QT_NO_REGEXP
+    } else if (value.isRegExp()) {
+        return QVariant(value.toRegExp());
+#endif
+    } else if (value.isArray()) {
+        QVariantList list;
+
+        quint32 length = (quint32)value.property(QLatin1String("length")).toNumber();
+
+        for (quint32 ii = 0; ii < length; ++ii) {
+            QVariant v = scriptValueToVariant(value.property(ii));
+            list << v;
+        }
+
+        return QVariant(list);
+    } else if (value.isQObject()) {
+        QDeclarativeListModel *lm = qobject_cast<QDeclarativeListModel *>(value.toQObject());
+        if (lm) {
+            QDeclarativeListModelWorkerAgent *agent = lm->agent();
+            if (agent) {
+                QDeclarativeListModelWorkerAgent::VariantRef v(agent);
+                return QVariant::fromValue(v);
+            } else {
+                return QVariant();
+            }
+        } else {
+            // No other QObject's are allowed to be sent
+            return QVariant();
+        }
+    } else if (value.isObject()) {
+        QVariantHash hash;
+
+        QScriptValueIterator iter(value);
+
+        while (iter.hasNext()) {
+            iter.next();
+            hash.insert(iter.name(), scriptValueToVariant(iter.value()));
+        }
+
+        return QVariant(hash);
+    }
+
+    return QVariant();
+
+}
+
+QScriptValue QDeclarativeWorkerScriptEnginePrivate::variantToScriptValue(const QVariant &value, QScriptEngine *engine)
+{
+    if (value.userType() == QVariant::Bool) {
+        return QScriptValue(value.toBool());
+    } else if (value.userType() == QVariant::String) {
+        return QScriptValue(value.toString());
+    } else if (value.userType() == QMetaType::QReal) {
+        return QScriptValue(value.toReal());
+    } else if (value.userType() == QVariant::DateTime) {
+        return engine->newDate(value.toDateTime());
+#ifndef QT_NO_REGEXP
+    } else if (value.userType() == QVariant::RegExp) {
+        return engine->newRegExp(value.toRegExp());
+#endif
+    } else if (value.userType() == qMetaTypeId<QDeclarativeListModelWorkerAgent::VariantRef>()) {
+        QDeclarativeListModelWorkerAgent::VariantRef vr = qvariant_cast<QDeclarativeListModelWorkerAgent::VariantRef>(value);
+        if (vr.a->scriptEngine() == 0)
+            vr.a->setScriptEngine(engine);
+        else if (vr.a->scriptEngine() != engine)
+            return engine->nullValue();
+        QScriptValue o = engine->newQObject(vr.a);
+        o.setData(engine->newVariant(value)); // Keeps the agent ref so that it is cleaned up on gc
+        return o;
+    } else if (value.userType() == QMetaType::QVariantList) {
+        QVariantList list = qvariant_cast<QVariantList>(value);
+        QScriptValue rv = engine->newArray(list.count());
+
+        for (quint32 ii = 0; ii < quint32(list.count()); ++ii)
+            rv.setProperty(ii, variantToScriptValue(list.at(ii), engine));
+
+        return rv;
+    } else if (value.userType() == QMetaType::QVariantHash) {
+
+        QVariantHash hash = qvariant_cast<QVariantHash>(value);
+
+        QScriptValue rv = engine->newObject();
+
+        for (QVariantHash::ConstIterator iter = hash.begin(); iter != hash.end(); ++iter)
+            rv.setProperty(iter.key(), variantToScriptValue(iter.value(), engine));
+
+        return rv;
+    } else {
+        return engine->nullValue();
+    }
+}
+
+WorkerDataEvent::WorkerDataEvent(int workerId, const QVariant &data)
+: QEvent((QEvent::Type)WorkerData), m_id(workerId), m_data(data)
+{
+}
+
+WorkerDataEvent::~WorkerDataEvent()
+{
+}
+
+int WorkerDataEvent::workerId() const
+{
+    return m_id;
+}
+
+QVariant WorkerDataEvent::data() const
+{
+    return m_data;
+}
+
+WorkerLoadEvent::WorkerLoadEvent(int workerId, const QUrl &url)
+: QEvent((QEvent::Type)WorkerLoad), m_id(workerId), m_url(url)
+{
+}
+
+int WorkerLoadEvent::workerId() const
+{
+    return m_id;
+}
+
+QUrl WorkerLoadEvent::url() const
+{
+    return m_url;
+}
+
+WorkerRemoveEvent::WorkerRemoveEvent(int workerId)
+: QEvent((QEvent::Type)WorkerRemove), m_id(workerId)
+{
+}
+
+int WorkerRemoveEvent::workerId() const
+{
+    return m_id;
+}
+
+WorkerErrorEvent::WorkerErrorEvent(const QDeclarativeError &error)
+: QEvent((QEvent::Type)WorkerError), m_error(error)
+{
+}
+
+QDeclarativeError WorkerErrorEvent::error() const
+{
+    return m_error;
+}
+
+QDeclarativeWorkerScriptEngine::QDeclarativeWorkerScriptEngine(QDeclarativeEngine *parent)
+: QThread(parent), d(new QDeclarativeWorkerScriptEnginePrivate(parent))
+{
+    d->m_lock.lock();
+    connect(d, SIGNAL(stopThread()), this, SLOT(quit()), Qt::DirectConnection);
+    start(QThread::IdlePriority);
+    d->m_wait.wait(&d->m_lock);
+    d->moveToThread(this);
+    d->m_lock.unlock();
+}
+
+QDeclarativeWorkerScriptEngine::~QDeclarativeWorkerScriptEngine()
+{
+    d->m_lock.lock();
+    qDeleteAll(d->workers);
+    d->workers.clear();
+    QCoreApplication::postEvent(d, new QEvent((QEvent::Type)QDeclarativeWorkerScriptEnginePrivate::WorkerDestroyEvent));
+    d->m_lock.unlock();
+
+    wait();
+    d->deleteLater();
+}
+
+QDeclarativeWorkerScriptEnginePrivate::WorkerScript::WorkerScript()
+: id(-1), initialized(false), owner(0)
+{
+}
+
+int QDeclarativeWorkerScriptEngine::registerWorkerScript(QDeclarativeWorkerScript *owner)
+{
+    QDeclarativeWorkerScriptEnginePrivate::WorkerScript *script = new QDeclarativeWorkerScriptEnginePrivate::WorkerScript;
+    script->id = d->m_nextId++;
+    script->owner = owner;
+
+    d->m_lock.lock();
+    d->workers.insert(script->id, script);
+    d->m_lock.unlock();
+
+    return script->id;
+}
+
+void QDeclarativeWorkerScriptEngine::removeWorkerScript(int id)
+{
+    QCoreApplication::postEvent(d, new WorkerRemoveEvent(id));
+}
+
+void QDeclarativeWorkerScriptEngine::executeUrl(int id, const QUrl &url)
+{
+    QCoreApplication::postEvent(d, new WorkerLoadEvent(id, url));
+}
+
+void QDeclarativeWorkerScriptEngine::sendMessage(int id, const QVariant &data)
+{
+    QCoreApplication::postEvent(d, new WorkerDataEvent(id, data));
+}
+
+void QDeclarativeWorkerScriptEngine::run()
+{
+    d->m_lock.lock();
+
+    d->workerEngine = new QDeclarativeWorkerScriptEnginePrivate::ScriptEngine(d);
+
+    d->m_wait.wakeAll();
+
+    d->m_lock.unlock();
+
+    exec();
+
+    delete d->workerEngine; d->workerEngine = 0;
+}
+
+
+/*!
+    \qmlclass WorkerScript QDeclarativeWorkerScript
+    \ingroup qml-utility-elements
+    \brief The WorkerScript element enables the use of threads in QML.
+
+    Use WorkerScript to run operations in a new thread.
+    This is useful for running operations in the background so
+    that the main GUI thread is not blocked.
+
+    Messages can be passed between the new thread and the parent thread
+    using \l sendMessage() and the \l {WorkerScript::onMessage}{onMessage()} handler.
+
+    An example:
+
+    \snippet doc/src/snippets/declarative/workerscript.qml 0
+
+    The above worker script specifies a JavaScript file, "script.js", that handles
+    the operations to be performed in the new thread. Here is \c script.js:
+
+    \quotefile doc/src/snippets/declarative/script.js
+
+    When the user clicks anywhere within the rectangle, \c sendMessage() is
+    called, triggering the \tt WorkerScript.onMessage() handler in
+    \tt script.js. This in turn sends a reply message that is then received
+    by the \tt onMessage() handler of \tt myWorker.
+
+
+    \section3 Restrictions
+
+    Since the \c WorkerScript.onMessage() function is run in a separate thread, the
+    JavaScript file is evaluated in a context separate from the main QML engine. This means
+    that unlike an ordinary JavaScript file that is imported into QML, the \c script.js
+    in the above example cannot access the properties, methods or other attributes
+    of the QML item, nor can it access any context properties set on the QML object
+    through QDeclarativeContext.
+
+    Additionally, there are restrictions on the types of values that can be passed to and
+    from the worker script. See the sendMessage() documentation for details.
+
+    \sa {declarative/threading/workerscript}{WorkerScript example},
+        {declarative/threading/threadedlistmodel}{Threaded ListModel example}
+*/
+QDeclarativeWorkerScript::QDeclarativeWorkerScript(QObject *parent)
+: QObject(parent), m_engine(0), m_scriptId(-1), m_componentComplete(true)
+{
+}
+
+QDeclarativeWorkerScript::~QDeclarativeWorkerScript()
+{
+    if (m_scriptId != -1) m_engine->removeWorkerScript(m_scriptId);
+}
+
+/*!
+    \qmlproperty url WorkerScript::source
+
+    This holds the url of the JavaScript file that implements the
+    \tt WorkerScript.onMessage() handler for threaded operations.
+*/
+QUrl QDeclarativeWorkerScript::source() const
+{
+    return m_source;
+}
+
+void QDeclarativeWorkerScript::setSource(const QUrl &source)
+{
+    if (m_source == source)
+        return;
+
+    m_source = source;
+
+    if (engine())
+        m_engine->executeUrl(m_scriptId, m_source);
+
+    emit sourceChanged();
+}
+
+/*!
+    \qmlmethod WorkerScript::sendMessage(jsobject message)
+
+    Sends the given \a message to a worker script handler in another
+    thread. The other worker script handler can receive this message
+    through the onMessage() handler.
+
+    The \c message object may only contain values of the following
+    types:
+
+    \list
+    \o boolean, number, string
+    \o JavaScript objects and arrays
+    \o ListModel objects (any other type of QObject* is not allowed)
+    \endlist
+
+    All objects and arrays are copied to the \c message. With the exception
+    of ListModel objects, any modifications by the other thread to an object
+    passed in \c message will not be reflected in the original object.
+*/
+void QDeclarativeWorkerScript::sendMessage(const QScriptValue &message)
+{
+    if (!engine()) {
+        qWarning("QDeclarativeWorkerScript: Attempt to send message before WorkerScript establishment");
+        return;
+    }
+
+    m_engine->sendMessage(m_scriptId, QDeclarativeWorkerScriptEnginePrivate::scriptValueToVariant(message));
+}
+
+void QDeclarativeWorkerScript::classBegin()
+{
+    m_componentComplete = false;
+}
+
+QDeclarativeWorkerScriptEngine *QDeclarativeWorkerScript::engine()
+{
+    if (m_engine) return m_engine;
+    if (m_componentComplete) {
+        QDeclarativeEngine *engine = qmlEngine(this);
+        if (!engine) {
+            qWarning("QDeclarativeWorkerScript: engine() called without qmlEngine() set");
+            return 0;
+        }
+
+        m_engine = QDeclarativeEnginePrivate::get(engine)->getWorkerScriptEngine();
+        m_scriptId = m_engine->registerWorkerScript(this);
+
+        if (m_source.isValid())
+            m_engine->executeUrl(m_scriptId, m_source);
+
+        return m_engine;
+    }
+    return 0;
+}
+
+void QDeclarativeWorkerScript::componentComplete()
+{
+    m_componentComplete = true;
+    engine(); // Get it started now.
+}
+
+/*!
+    \qmlsignal WorkerScript::onMessage(jsobject msg)
+
+    This handler is called when a message \a msg is received from a worker
+    script in another thread through a call to sendMessage().
+*/
+
+bool QDeclarativeWorkerScript::event(QEvent *event)
+{
+    if (event->type() == (QEvent::Type)WorkerDataEvent::WorkerData) {
+        QDeclarativeEngine *engine = qmlEngine(this);
+        if (engine) {
+            QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine);
+            WorkerDataEvent *workerEvent = static_cast<WorkerDataEvent *>(event);
+            QScriptValue value =
+                QDeclarativeWorkerScriptEnginePrivate::variantToScriptValue(workerEvent->data(), scriptEngine);
+            emit message(value);
+        }
+        return true;
+    } else if (event->type() == (QEvent::Type)WorkerErrorEvent::WorkerError) {
+        WorkerErrorEvent *workerEvent = static_cast<WorkerErrorEvent *>(event);
+        QDeclarativeEnginePrivate::warning(qmlEngine(this), workerEvent->error());
+        return true;
+    } else {
+        return QObject::event(event);
+    }
+}
+
+QT_END_NAMESPACE
+
+#include <qdeclarativeworkerscript.moc>
+