Two way WorkerScript communications

7 files changed, 257 insertions, 156 deletions

diff --git a/src/declarative/qml/qmlengine.cpp b/src/declarative/qml/qmlengine.cpp
index 864d07e..8429232 100644
--- a/src/declarative/qml/qmlengine.cpp
+++ b/src/declarative/qml/qmlengine.cpp
@@ -226,6 +226,7 @@ void QmlEnginePrivate::init()
     Q_Q(QmlEngine);
     qRegisterMetaType<QVariant>("QVariant");
     qRegisterMetaType<QmlScriptString>("QmlScriptString");
+    qRegisterMetaType<QScriptValue>("QScriptValue");
 
     scriptEngine.installTranslatorFunctions();
     contextClass = new QmlContextScriptClass(q);
diff --git a/src/declarative/qml/qmlmetatype.cpp b/src/declarative/qml/qmlmetatype.cpp
index 5fb2f50..46d967b 100644
--- a/src/declarative/qml/qmlmetatype.cpp
+++ b/src/declarative/qml/qmlmetatype.cpp
@@ -58,6 +58,7 @@
 #include <qlocale.h>
 #include <ctype.h>
 #include <QtCore/qcryptographichash.h>
+#include <QtScript/qscriptvalue.h>
 #include <private/qmlcustomparser_p.h>
 
 #ifdef QT_BOOTSTRAPPED
@@ -929,6 +930,7 @@ QList<QmlType*> QmlMetaType::qmlTypes()
 #include <QtGui/qvector3d.h>
 #include <QtGui/qvector4d.h>
 #include <QtGui/qquaternion.h>
+Q_DECLARE_METATYPE(QScriptValue);
 
 /*!
     Copies \a copy into \a data, assuming they both are of type \a type.  If
@@ -1138,6 +1140,9 @@ bool QmlMetaType::copy(int type, void *data, const void *copy)
             if (type == qMetaTypeId<QVariant>()) {
                 *static_cast<NS(QVariant) *>(data) = *static_cast<const NS(QVariant)*>(copy);
                 return true;
+            } else if (type == qMetaTypeId<QScriptValue>()) {
+                *static_cast<NS(QScriptValue) *>(data) = *static_cast<const NS(QScriptValue)*>(copy);
+                return true;
             } else if (typeCategory(type) != Unknown) {
                 *static_cast<void **>(data) = *static_cast<void* const *>(copy);
                 return true;
@@ -1340,6 +1345,9 @@ bool QmlMetaType::copy(int type, void *data, const void *copy)
             if (type == qMetaTypeId<QVariant>()) {
                 *static_cast<NS(QVariant) *>(data) = NS(QVariant)();
                 return true;
+            } else if (type == qMetaTypeId<QScriptValue>()) {
+                *static_cast<NS(QScriptValue) *>(data) = NS(QScriptValue)();
+                return true;
             } else if (typeCategory(type) != Unknown) {
                 *static_cast<void **>(data) = 0;
                 return true;
diff --git a/src/declarative/qml/qmlobjectscriptclass.cpp b/src/declarative/qml/qmlobjectscriptclass.cpp
index 1a6f724..f78a12a 100644
--- a/src/declarative/qml/qmlobjectscriptclass.cpp
+++ b/src/declarative/qml/qmlobjectscriptclass.cpp
@@ -229,12 +229,16 @@ QScriptValue QmlObjectScriptClass::property(QObject *obj, const Identifier &name
         } else if (lastData->flags & QmlPropertyCache::Data::IsQmlList) {
             return enginePriv->listClass->newList(obj, lastData->coreIndex, 
                                                   QmlListScriptClass::QmlListPtr);
-        } if (lastData->flags & QmlPropertyCache::Data::IsQObjectDerived) {
+        } else if (lastData->flags & QmlPropertyCache::Data::IsQObjectDerived) {
             QObject *rv = 0;
             void *args[] = { &rv, 0 };
             QMetaObject::metacall(obj, QMetaObject::ReadProperty, lastData->coreIndex, args);
-
             return newQObject(rv, lastData->propType);
+        } else if (lastData->flags & QmlPropertyCache::Data::IsQScriptValue) {
+            QScriptValue rv = scriptEngine->nullValue();
+            void *args[] = { &rv, 0 };
+            QMetaObject::metacall(obj, QMetaObject::ReadProperty, lastData->coreIndex, args);
+            return rv;
         } else {
             QVariant var = obj->metaObject()->property(lastData->coreIndex).read(obj);
             return enginePriv->scriptValueFromVariant(var);
diff --git a/src/declarative/qml/qmlpropertycache.cpp b/src/declarative/qml/qmlpropertycache.cpp
index b7a5fad..ff4991c 100644
--- a/src/declarative/qml/qmlpropertycache.cpp
+++ b/src/declarative/qml/qmlpropertycache.cpp
@@ -45,6 +45,8 @@
 
 QT_BEGIN_NAMESPACE
 
+Q_DECLARE_METATYPE(QScriptValue);
+
 void QmlPropertyCache::Data::load(const QMetaProperty &p)
 {
     propType = p.userType();
@@ -61,6 +63,8 @@ void QmlPropertyCache::Data::load(const QMetaProperty &p)
 
     if (propType == qMetaTypeId<QmlBinding *>()) {
         flags |= Data::IsQmlBinding;
+    } else if (propType == qMetaTypeId<QScriptValue>()) {
+        flags |= Data::IsQScriptValue;
     } else if (p.isEnumType()) {
         flags |= Data::IsEnumType;
     } else {
diff --git a/src/declarative/qml/qmlpropertycache_p.h b/src/declarative/qml/qmlpropertycache_p.h
index c2e8abe..8f19a8b 100644
--- a/src/declarative/qml/qmlpropertycache_p.h
+++ b/src/declarative/qml/qmlpropertycache_p.h
@@ -83,7 +83,8 @@ public:
                     IsEnumType        = 0x00000010,
                     IsQmlList         = 0x00000020,
                     IsQList           = 0x00000040,
-                    IsQmlBinding      = 0x00000080 
+                    IsQmlBinding      = 0x00000080,
+                    IsQScriptValue    = 0x00000100
         };
         Q_DECLARE_FLAGS(Flags, Flag)
                         
diff --git a/src/declarative/qml/qmlworkerscript.cpp b/src/declarative/qml/qmlworkerscript.cpp
index a6428dd..d4fcf4a 100644
--- a/src/declarative/qml/qmlworkerscript.cpp
+++ b/src/declarative/qml/qmlworkerscript.cpp
@@ -55,15 +55,15 @@ class WorkerDataEvent : public QEvent
 public:
     enum Type { WorkerData = QEvent::User };
 
-    WorkerDataEvent(int workerId, QmlWorkerScriptEngine::Data *data);
+    WorkerDataEvent(int workerId, const QVariant &data);
     virtual ~WorkerDataEvent();
 
     int workerId() const;
-    QmlWorkerScriptEngine::Data *takeData();
+    QVariant data() const;
 
 private:
     int m_id;
-    QmlWorkerScriptEngine::Data *m_data;
+    QVariant m_data;
 };
 
 class WorkerLoadEvent : public QEvent
@@ -81,31 +81,64 @@ private:
     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 QmlWorkerScriptEnginePrivate : public QObject
 {
 public:
     QmlWorkerScriptEnginePrivate();
 
-    QScriptEngine *workerEngine;
+    struct ScriptEngine : public QScriptEngine 
+    {
+        ScriptEngine(QmlWorkerScriptEnginePrivate *parent) : p(parent) {}
+        QmlWorkerScriptEnginePrivate *p;
+    };
+    ScriptEngine *workerEngine;
+    static QmlWorkerScriptEnginePrivate *get(QScriptEngine *e) {
+        return static_cast<ScriptEngine *>(e)->p;
+    }
 
     QMutex m_lock;
     QWaitCondition m_wait;
 
+    struct WorkerScript {
+        WorkerScript();
+
+        int id;
+        bool initialized;
+        QmlWorkerScript *owner;
+        QScriptValue object;
+
+        QScriptValue callback;
+    };
+
+    QHash<int, WorkerScript *> workers;
     QScriptValue getWorker(int);
 
     int m_nextId;
-    QHash<int, QScriptValue> m_workers;
 
     static QVariant scriptValueToVariant(const QScriptValue &);
     static QScriptValue variantToScriptValue(const QVariant &, QScriptEngine *);
 
-    static QScriptValue onmessage(QScriptContext *ctxt, QScriptEngine *engine);
+    static QScriptValue onMessage(QScriptContext *ctxt, QScriptEngine *engine);
+    static QScriptValue sendMessage(QScriptContext *ctxt, QScriptEngine *engine);
 
 protected:
     virtual bool event(QEvent *);
 
 private:
-    void processMessage(int, QmlWorkerScriptEngine::Data *);
+    void processMessage(int, const QVariant &);
     void processLoad(int, const QUrl &);
 };
 
@@ -114,34 +147,75 @@ QmlWorkerScriptEnginePrivate::QmlWorkerScriptEnginePrivate()
 {
 }
 
-QScriptValue QmlWorkerScriptEnginePrivate::onmessage(QScriptContext *ctxt, QScriptEngine *engine)
+QScriptValue QmlWorkerScriptEnginePrivate::onMessage(QScriptContext *ctxt, QScriptEngine *engine)
 {
+    QmlWorkerScriptEnginePrivate *p = QmlWorkerScriptEnginePrivate::get(engine);
+
+    int id = ctxt->thisObject().data().toVariant().toInt();
+
+    WorkerScript *script = p->workers.value(id);
+    if (!script)
+        return engine->undefinedValue();
+
     if (ctxt->argumentCount() >= 1) 
-        ctxt->thisObject().setData(ctxt->argument(0));
+        script->callback = ctxt->argument(0);
+
+    return script->callback;
+}
+
+QScriptValue QmlWorkerScriptEnginePrivate::sendMessage(QScriptContext *ctxt, QScriptEngine *engine)
+{
+    if (!ctxt->argumentCount())
+        return engine->undefinedValue();
+
+    QmlWorkerScriptEnginePrivate *p = QmlWorkerScriptEnginePrivate::get(engine);
+
+    int id = ctxt->thisObject().data().toVariant().toInt();
+
+    WorkerScript *script = p->workers.value(id);
+    if (!script) 
+        return engine->undefinedValue();
 
-    return ctxt->thisObject().data();
+    p->m_lock.lock();
+    if (script->owner) 
+        QCoreApplication::postEvent(script->owner, 
+                                    new WorkerDataEvent(0, scriptValueToVariant(ctxt->argument(0))));
+    p->m_lock.unlock();
+
+    return engine->undefinedValue();
 }
 
 QScriptValue QmlWorkerScriptEnginePrivate::getWorker(int id)
 {
-    QHash<int, QScriptValue>::Iterator iter = m_workers.find(id);
-    if (iter == m_workers.end()) {
-        QScriptValue worker = workerEngine->newObject();
+    QHash<int, WorkerScript *>::ConstIterator iter = workers.find(id);
+
+    if (iter == workers.end())
+        return workerEngine->nullValue();
+
+    WorkerScript *script = *iter;
+    if (!script->initialized) {
 
-        worker.setProperty(QLatin1String("onmessage"), workerEngine->newFunction(onmessage), 
-                           QScriptValue::PropertyGetter | QScriptValue::PropertySetter);
+        script->initialized = true;
+        script->object = workerEngine->newObject();
 
-        iter = m_workers.insert(id, worker);
+        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 *iter;
+    return script->object;
 }
 
 bool QmlWorkerScriptEnginePrivate::event(QEvent *event)
 {
     if (event->type() == (QEvent::Type)WorkerDataEvent::WorkerData) {
         WorkerDataEvent *workerEvent = static_cast<WorkerDataEvent *>(event);
-        processMessage(workerEvent->workerId(), workerEvent->takeData());
+        processMessage(workerEvent->workerId(), workerEvent->data());
         return true;
     } else if (event->type() == (QEvent::Type)WorkerLoadEvent::WorkerLoad) {
         WorkerLoadEvent *workerEvent = static_cast<WorkerLoadEvent *>(event);
@@ -152,19 +226,18 @@ bool QmlWorkerScriptEnginePrivate::event(QEvent *event)
     }
 }
 
-void QmlWorkerScriptEnginePrivate::processMessage(int id, QmlWorkerScriptEngine::Data *data)
+void QmlWorkerScriptEnginePrivate::processMessage(int id, const QVariant &data)
 {
-    QScriptValue worker = getWorker(id);
-    QScriptValue onmessage = worker.data();
+    WorkerScript *script = workers.value(id);
+    if (!script)
+        return;
 
-    if (onmessage.isFunction()) {
+    if (script->callback.isFunction()) {
         QScriptValue args = workerEngine->newArray(1);
-        args.setProperty(0, variantToScriptValue(data->var, workerEngine));
+        args.setProperty(0, variantToScriptValue(data, workerEngine));
 
-        onmessage.call(worker, args);
+        script->callback.call(script->object, args);
     }
-
-    if (data) delete data;
 }
 
 void QmlWorkerScriptEnginePrivate::processLoad(int id, const QUrl &url)
@@ -190,14 +263,80 @@ void QmlWorkerScriptEnginePrivate::processLoad(int id, const QUrl &url)
     }
 }
 
-WorkerDataEvent::WorkerDataEvent(int workerId, QmlWorkerScriptEngine::Data *data)
+QVariant QmlWorkerScriptEnginePrivate::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.isArray()) {
+        QVariantList list;
+
+        quint32 length = (quint32)value.property("length").toNumber();
+
+        for (quint32 ii = 0; ii < length; ++ii) {
+            QVariant v = scriptValueToVariant(ii);
+            list << v;
+        }
+
+        return QVariant(list);
+    } 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 QmlWorkerScriptEnginePrivate::variantToScriptValue(const QVariant &value, QScriptEngine *engine)
+{
+    if (value.type() == QVariant::Bool) {
+        return QScriptValue(value.toBool());
+    } else if (value.type() == QVariant::String) {
+        return QScriptValue(value.toString());
+    } else if (value.type() == (QVariant::Type)QMetaType::QReal) {
+        return QScriptValue(value.toReal());
+    } else if (value.type() == (QVariant::Type)QMetaType::QVariantList) {
+        QVariantList list = qvariant_cast<QVariantList>(value);
+        QScriptValue rv = engine->newArray(list.count());
+
+        for (quint32 ii = 0; ii < list.count(); ++ii) 
+            rv.setProperty(ii, variantToScriptValue(list.at(ii), engine));
+
+        return rv;
+    } else if (value.type() == (QVariant::Type)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()
 {
-    if (m_data) { delete m_data; m_data = 0; }
 }
 
 int WorkerDataEvent::workerId() const
@@ -205,11 +344,9 @@ int WorkerDataEvent::workerId() const
     return m_id;
 }
 
-QmlWorkerScriptEngine::Data *WorkerDataEvent::takeData()
+QVariant WorkerDataEvent::data() const
 {
-    QmlWorkerScriptEngine::Data *rv = m_data;
-    m_data = 0;
-    return rv;
+    return m_data;
 }
 
 WorkerLoadEvent::WorkerLoadEvent(int workerId, const QUrl &url)
@@ -227,6 +364,16 @@ 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;
+}
+
 QmlWorkerScriptEngine::QmlWorkerScriptEngine(QObject *parent)
 : QThread(parent), d(new QmlWorkerScriptEnginePrivate)
 {
@@ -234,6 +381,7 @@ QmlWorkerScriptEngine::QmlWorkerScriptEngine(QObject *parent)
     start(QThread::LowPriority);
     d->m_wait.wait(&d->m_lock);
     d->moveToThread(this);
+    d->m_lock.unlock();
 }
 
 QmlWorkerScriptEngine::~QmlWorkerScriptEngine()
@@ -241,48 +389,44 @@ QmlWorkerScriptEngine::~QmlWorkerScriptEngine()
     delete d; d = 0;
 }
 
-QmlWorkerScriptEngine::WorkerScript::WorkerScript()
-: engine(0), id(0)
+QmlWorkerScriptEnginePrivate::WorkerScript::WorkerScript()
+: id(-1), initialized(false), owner(0)
 {
 }
 
-void QmlWorkerScriptEngine::WorkerScript::executeUrl(const QUrl &url)
+int QmlWorkerScriptEngine::registerWorkerScript(QmlWorkerScript *owner)
 {
-    engine->executeUrl(this, url);
-}
+    QmlWorkerScriptEnginePrivate::WorkerScript *script = new QmlWorkerScriptEnginePrivate::WorkerScript;
+    script->id = d->m_nextId++;
+    script->owner = owner;
 
-void QmlWorkerScriptEngine::WorkerScript::sendMessage(Data *data)
-{
-    engine->sendMessage(this, data);
+    d->m_lock.lock();
+    d->workers.insert(script->id, script);
+    d->m_lock.unlock();
+
+    return script->id;
 }
 
-void QmlWorkerScriptEngine::executeUrl(WorkerScript *script, const QUrl &data)
+void QmlWorkerScriptEngine::removeWorkerScript(int id)
 {
-    QCoreApplication::postEvent(d, new WorkerLoadEvent(script->id, data));
+    QCoreApplication::postEvent(d, new WorkerRemoveEvent(id));
 }
 
-/*!
-    Ownership of \a data transfers to QmlWorkerScriptEngine.  It can not be modified by 
-    the caller.
-*/
-void QmlWorkerScriptEngine::sendMessage(WorkerScript *script, Data *data)
+void QmlWorkerScriptEngine::executeUrl(int id, const QUrl &url)
 {
-    QCoreApplication::postEvent(d, new WorkerDataEvent(script->id, data));
+    QCoreApplication::postEvent(d, new WorkerLoadEvent(id, url));
 }
 
-QmlWorkerScriptEngine::WorkerScript *QmlWorkerScriptEngine::createWorkerScript()
+void QmlWorkerScriptEngine::sendMessage(int id, const QVariant &data)
 {
-    WorkerScript *rv = new WorkerScript;
-    rv->engine = this;
-    rv->id = d->m_nextId++;
-    return rv;
+    QCoreApplication::postEvent(d, new WorkerDataEvent(id, data));
 }
 
 void QmlWorkerScriptEngine::run()
 {
     d->m_lock.lock();
 
-    d->workerEngine = new QScriptEngine;
+    d->workerEngine = new QmlWorkerScriptEnginePrivate::ScriptEngine(d);
 
     d->m_wait.wakeAll();
 
@@ -294,80 +438,13 @@ void QmlWorkerScriptEngine::run()
 }
 
 QmlWorkerScript::QmlWorkerScript(QObject *parent)
-: QObject(parent), m_script(0)
+: QObject(parent), m_engine(0), m_scriptId(-1)
 {
 }
 
 QmlWorkerScript::~QmlWorkerScript()
 {
-    if (m_script) { delete m_script; m_script = 0; }
-}
-
-QVariant QmlWorkerScriptEnginePrivate::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.isArray()) {
-        QVariantList list;
-
-        quint32 length = (quint32)value.property("length").toNumber();
-
-        for (quint32 ii = 0; ii < length; ++ii) {
-            QVariant v = scriptValueToVariant(ii);
-            list << v;
-        }
-
-        return QVariant(list);
-    } 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 QmlWorkerScriptEnginePrivate::variantToScriptValue(const QVariant &value, QScriptEngine *engine)
-{
-    if (value.type() == QVariant::Bool) {
-        return QScriptValue(value.toBool());
-    } else if (value.type() == QVariant::String) {
-        return QScriptValue(value.toString());
-    } else if (value.type() == (QVariant::Type)QMetaType::QReal) {
-        return QScriptValue(value.toReal());
-    } else if (value.type() == (QVariant::Type)QMetaType::QVariantList) {
-        QVariantList list = qvariant_cast<QVariantList>(value);
-        QScriptValue rv = engine->newArray(list.count());
-
-        for (quint32 ii = 0; ii < list.count(); ++ii) 
-            rv.setProperty(ii, variantToScriptValue(list.at(ii), engine));
-
-        return rv;
-    } else if (value.type() == (QVariant::Type)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();
-    }
+    if (m_scriptId != -1) m_engine->removeWorkerScript(m_scriptId);
 }
 
 QUrl QmlWorkerScript::source() const
@@ -382,37 +459,55 @@ void QmlWorkerScript::setSource(const QUrl &source)
 
     m_source = source;
 
-    if (m_script) 
-        m_script->executeUrl(m_source);
+    if (m_engine) 
+        m_engine->executeUrl(m_scriptId, m_source);
 
     emit sourceChanged();
 }
 
 void QmlWorkerScript::sendMessage(const QScriptValue &message)
 {
-    if (!m_script) {
+    if (!m_engine) {
         qWarning("QmlWorkerScript: Attempt to send message before WorkerScript establishment");
         return;
     }
 
-    QmlWorkerScriptEngine::Data *data = new QmlWorkerScriptEngine::Data;
-    data->var = QmlWorkerScriptEnginePrivate::scriptValueToVariant(message);
-    m_script->sendMessage(data);
+    m_engine->sendMessage(m_scriptId, QmlWorkerScriptEnginePrivate::scriptValueToVariant(message));
 }
 
 void QmlWorkerScript::componentComplete()
 {
-    if (!m_script) {
+    if (!m_engine) {
         QmlEngine *engine = qmlEngine(this);
         if (!engine) {
             qWarning("QmlWorkerScript: componentComplete() called without qmlEngine() set");
             return;
         }
-        m_script = QmlEnginePrivate::get(engine)->getWorkerScriptEngine()->createWorkerScript();
+
+        m_engine = QmlEnginePrivate::get(engine)->getWorkerScriptEngine();
+        m_scriptId = m_engine->registerWorkerScript(this);
 
         if (m_source.isValid())
-            m_script->executeUrl(m_source);
+            m_engine->executeUrl(m_scriptId, m_source);
     }
 }
 
+bool QmlWorkerScript::event(QEvent *event)
+{
+    if (event->type() == (QEvent::Type)WorkerDataEvent::WorkerData) {
+        QmlEngine *engine = qmlEngine(this);
+        if (engine) {
+            QScriptEngine *scriptEngine = QmlEnginePrivate::getScriptEngine(engine);
+            WorkerDataEvent *workerEvent = static_cast<WorkerDataEvent *>(event);
+            QScriptValue value = 
+                QmlWorkerScriptEnginePrivate::variantToScriptValue(workerEvent->data(), scriptEngine);
+            emit message(value);
+        }
+        return true;
+    } else {
+        return QObject::event(event);
+    }
+}
+
+
 QML_DEFINE_TYPE(Qt, 4, 6, WorkerScript, QmlWorkerScript);
diff --git a/src/declarative/qml/qmlworkerscript_p.h b/src/declarative/qml/qmlworkerscript_p.h
index 90861f8..b7106c5 100644
--- a/src/declarative/qml/qmlworkerscript_p.h
+++ b/src/declarative/qml/qmlworkerscript_p.h
@@ -59,6 +59,7 @@
 #include <QtScript/qscriptvalue.h>
 #include <QtCore/qurl.h>
 
+class QmlWorkerScript;
 class QmlWorkerScriptEnginePrivate;
 class QmlWorkerScriptEngine : public QThread
 {
@@ -67,26 +68,10 @@ public:
     QmlWorkerScriptEngine(QObject *parent = 0);
     virtual ~QmlWorkerScriptEngine();
 
-    class Data;
-    class WorkerScript {
-    public:
-        void sendMessage(Data *);
-        void executeUrl(const QUrl &);
-
-    private:
-        WorkerScript();
-        friend class QmlWorkerScriptEngine;
-        QmlWorkerScriptEngine *engine;
-        int id;
-    };
-    WorkerScript *createWorkerScript();
-
-    struct Data {
-        QVariant var;
-    };
-
-    void executeUrl(WorkerScript *, const QUrl &);
-    void sendMessage(WorkerScript *, Data *);
+    int registerWorkerScript(QmlWorkerScript *);
+    void removeWorkerScript(int);
+    void executeUrl(int, const QUrl &);
+    void sendMessage(int, const QVariant &);
 
 protected:
     virtual void run();
@@ -112,12 +97,15 @@ public slots:
 
 signals:
     void sourceChanged();
+    void message(const QScriptValue &messageObject);
 
 protected:
     virtual void componentComplete();
+    virtual bool event(QEvent *);
 
 private:
-    QmlWorkerScriptEngine::WorkerScript *m_script;
+    QmlWorkerScriptEngine *m_engine;
+    int m_scriptId;
     QUrl m_source;
 };
 QML_DECLARE_TYPE(QmlWorkerScript);