Merge branch 'kinetic-declarativeui' of git@scm.dev.nokia.troll.no:qt/kinetic into kinetic-declarativeui

Conflicts:
	src/declarative/qml/qmlmetatype.cpp

33 files changed, 641 insertions, 286 deletions

diff --git a/examples/declarative/loader/loader.pro b/examples/declarative/loader/loader.pro
index edd6267..84b2d21 100644
--- a/examples/declarative/loader/loader.pro
+++ b/examples/declarative/loader/loader.pro
@@ -1,5 +1,5 @@
 SOURCES = main.cpp qmlfolderlistmodel.cpp
-HEADERS = qmlfolderlistmodel.h qlistmodelinterface.h
+HEADERS = qmlfolderlistmodel.h
 RESOURCES = loader.qrc
 
 QT += script declarative network
diff --git a/examples/declarative/loader/qlistmodelinterface.h b/examples/declarative/loader/qlistmodelinterface.h
deleted file mode 100644
index 738378e..0000000
--- a/examples/declarative/loader/qlistmodelinterface.h
+++ /dev/null
@@ -1,85 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
-** Beta Release License Agreement.
-**
-** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
-** package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you are unsure which license is appropriate for your use, please
-** contact the sales department at qt-sales@nokia.com.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QLISTMODELINTERFACE_H
-#define QLISTMODELINTERFACE_H
-
-#include <QtCore/QHash>
-#include <QtCore/QVariant>
-
-
-QT_BEGIN_HEADER
-
-QT_BEGIN_NAMESPACE
-
-QT_MODULE(Declarative)
-
-class Q_DECLARATIVE_EXPORT QListModelInterface : public QObject
-{
-    Q_OBJECT
- public:
-    QListModelInterface(QObject *parent = 0) : QObject(parent) {}
-    virtual ~QListModelInterface() {}
-
-    virtual int count() const = 0;
-    virtual QHash<int,QVariant> data(int index, const QList<int>& roles = QList<int>()) const = 0;
-    virtual bool setData(int index, const QHash<int,QVariant>& values)
-    { Q_UNUSED(index); Q_UNUSED(values); return false; }
-
-    virtual QList<int> roles() const = 0;
-    virtual QString toString(int role) const = 0;
-
- Q_SIGNALS:
-    void itemsInserted(int index, int count);
-    void itemsRemoved(int index, int count);
-    void itemsMoved(int from, int to, int count);
-    void itemsChanged(int index, int count, const QList<int> &roles);
-
- protected:
-    QListModelInterface(QObjectPrivate &dd, QObject *parent) 
-        : QObject(dd, parent) {}
-};
-
-
-QT_END_NAMESPACE
-
-QT_END_HEADER
-#endif //QTREEMODELINTERFACE_H
diff --git a/examples/declarative/loader/qmlfolderlistmodel.h b/examples/declarative/loader/qmlfolderlistmodel.h
index f50719a..ac9568f 100644
--- a/examples/declarative/loader/qmlfolderlistmodel.h
+++ b/examples/declarative/loader/qmlfolderlistmodel.h
@@ -43,7 +43,7 @@
 #define QMLFOLDERLISTMODEL_H
 
 #include <qml.h>
-#include "qlistmodelinterface.h"
+#include "../../../src/declarative/3rdparty/qlistmodelinterface_p.h"
 
 class QmlContext;
 class QModelIndex;
diff --git a/examples/declarative/workerscript/workerscript.js b/examples/declarative/workerscript/workerscript.js
index 060c04a..f76471f 100644
--- a/examples/declarative/workerscript/workerscript.js
+++ b/examples/declarative/workerscript/workerscript.js
@@ -1,5 +1,15 @@
-onmessage = function(message) {
-    print ("You clicked the " + message.rectangle + " rectangle.");
-    print ("The coordinates were: " + message.x + "," + message.y);
+var lastx = 0;
+var lasty = 0;
+
+WorkerScript.onMessage = function(message) {
+    var ydiff = message.y - lasty;
+    var xdiff = message.x - lastx;
+
+    var total = Math.sqrt(ydiff * ydiff + xdiff * xdiff);
+
+    lastx = message.x;
+    lasty = message.y;
+
+    WorkerScript.sendMessage( {xmove: xdiff, ymove: ydiff, move: total} );
 }
 
diff --git a/examples/declarative/workerscript/workerscript.qml b/examples/declarative/workerscript/workerscript.qml
index 3729022..e36d4d4 100644
--- a/examples/declarative/workerscript/workerscript.qml
+++ b/examples/declarative/workerscript/workerscript.qml
@@ -6,6 +6,12 @@ Rectangle {
     WorkerScript {
         id: myWorker
         source: "workerscript.js"
+
+        onMessage: {
+            print("Moved " + messageObject.xmove + " along the X axis.");
+            print("Moved " + messageObject.ymove + " along the Y axis.");
+            print("Moved " + messageObject.move + " pixels.");
+        }
     }
 
     Rectangle {
diff --git a/src/declarative/graphicsitems/qmlgraphicsflickable.cpp b/src/declarative/graphicsitems/qmlgraphicsflickable.cpp
index e010081..d827cda 100644
--- a/src/declarative/graphicsitems/qmlgraphicsflickable.cpp
+++ b/src/declarative/graphicsitems/qmlgraphicsflickable.cpp
@@ -162,6 +162,7 @@ QmlGraphicsFlickablePrivate::QmlGraphicsFlickablePrivate()
     , interactive(true), deceleration(500), maxVelocity(5000), reportedVelocitySmoothing(100)
     , delayedPressEvent(0), delayedPressTarget(0), pressDelay(0)
     , horizontalVelocity(this), verticalVelocity(this), vTime(0), visibleArea(0)
+    , flickDirection(QmlGraphicsFlickable::AutoFlickDirection)
 {
     fixupXEvent = QmlTimeLineEvent::timeLineEvent<QmlGraphicsFlickablePrivate, &QmlGraphicsFlickablePrivate::fixupX>(&_moveX, this);
     fixupYEvent = QmlTimeLineEvent::timeLineEvent<QmlGraphicsFlickablePrivate, &QmlGraphicsFlickablePrivate::fixupY>(&_moveY, this);
@@ -576,6 +577,36 @@ QmlGraphicsFlickableVisibleArea *QmlGraphicsFlickable::visibleArea()
     return d->visibleArea;
 }
 
+/*!
+    \qmlproperty enumeration Flickable::flickDirection
+
+    This property determines which directions the view can be flicked.
+
+    \list
+    \o AutoFlickDirection (default) - allows flicking vertically if the
+    \e viewportHeight is not equal to the \e height of the Flickable.
+    Allows flicking horizontally if the \e viewportWidth is not equal
+    to the \e width of the Flickable.
+    \o HorizontalFlick - allows flicking horizontally.
+    \o VerticalFlick - allows flicking vertically.
+    \o HorizontalAndVerticalFlick - allows flicking in both directions.
+    \endlist
+*/
+QmlGraphicsFlickable::FlickDirection QmlGraphicsFlickable::flickDirection() const
+{
+    Q_D(const QmlGraphicsFlickable);
+    return d->flickDirection;
+}
+
+void QmlGraphicsFlickable::setFlickDirection(FlickDirection direction)
+{
+    Q_D(QmlGraphicsFlickable);
+    if (direction != d->flickDirection) {
+        d->flickDirection = direction;
+        emit flickDirectionChanged();
+    }
+}
+
 void QmlGraphicsFlickablePrivate::handleMousePressEvent(QGraphicsSceneMouseEvent *event)
 {
     if (interactive && timeline.isActive() && (qAbs(velocityX) > 10 || qAbs(velocityY) > 10))
@@ -1039,12 +1070,18 @@ qreal QmlGraphicsFlickable::vHeight() const
 
 bool QmlGraphicsFlickable::xflick() const
 {
-    return vWidth() != width();
+    Q_D(const QmlGraphicsFlickable);
+    if (d->flickDirection == QmlGraphicsFlickable::AutoFlickDirection)
+        return vWidth() != width();
+    return d->flickDirection & QmlGraphicsFlickable::HorizontalFlick;
 }
 
 bool QmlGraphicsFlickable::yflick() const
 {
-    return vHeight() !=  height();
+    Q_D(const QmlGraphicsFlickable);
+    if (d->flickDirection == QmlGraphicsFlickable::AutoFlickDirection)
+        return vHeight() !=  height();
+    return d->flickDirection & QmlGraphicsFlickable::VerticalFlick;
 }
 
 bool QmlGraphicsFlickable::sendMouseEvent(QGraphicsSceneMouseEvent *event)
diff --git a/src/declarative/graphicsitems/qmlgraphicsflickable_p.h b/src/declarative/graphicsitems/qmlgraphicsflickable_p.h
index 50248e1..9610ac1 100644
--- a/src/declarative/graphicsitems/qmlgraphicsflickable_p.h
+++ b/src/declarative/graphicsitems/qmlgraphicsflickable_p.h
@@ -70,6 +70,7 @@ class Q_DECLARATIVE_EXPORT QmlGraphicsFlickable : public QmlGraphicsItem
     Q_PROPERTY(qreal flickDeceleration READ flickDeceleration WRITE setFlickDeceleration)
     Q_PROPERTY(bool moving READ isMoving NOTIFY movingChanged)
     Q_PROPERTY(bool flicking READ isFlicking NOTIFY flickingChanged)
+    Q_PROPERTY(FlickDirection flickDirection READ flickDirection WRITE setFlickDirection NOTIFY flickDirectionChanged)
 
     Q_PROPERTY(bool interactive READ isInteractive WRITE setInteractive)
     Q_PROPERTY(int pressDelay READ pressDelay WRITE setPressDelay)
@@ -85,6 +86,8 @@ class Q_DECLARATIVE_EXPORT QmlGraphicsFlickable : public QmlGraphicsItem
     Q_PROPERTY(QmlList<QmlGraphicsItem *>* flickableChildren READ flickableChildren)
     Q_CLASSINFO("DefaultProperty", "flickableData")
 
+    Q_ENUMS(FlickDirection)
+
 public:
     QmlGraphicsFlickable(QmlGraphicsItem *parent=0);
     ~QmlGraphicsFlickable();
@@ -135,6 +138,10 @@ public:
 
     QmlGraphicsItem *viewport();
 
+    enum FlickDirection { AutoFlickDirection=0x00, HorizontalFlick=0x01, VerticalFlick=0x02, HorizontalAndVerticalFlick=0x03 };
+    FlickDirection flickDirection() const;
+    void setFlickDirection(FlickDirection);
+
 Q_SIGNALS:
     void viewportWidthChanged();
     void viewportHeightChanged();
@@ -151,6 +158,7 @@ Q_SIGNALS:
     void verticalVelocityChanged();
     void isAtBoundaryChanged();
     void pageChanged();
+    void flickDirectionChanged();
 
 protected:
     virtual bool sceneEventFilter(QGraphicsItem *, QEvent *);
diff --git a/src/declarative/graphicsitems/qmlgraphicsflickable_p_p.h b/src/declarative/graphicsitems/qmlgraphicsflickable_p_p.h
index 210052e..104769d 100644
--- a/src/declarative/graphicsitems/qmlgraphicsflickable_p_p.h
+++ b/src/declarative/graphicsitems/qmlgraphicsflickable_p_p.h
@@ -134,6 +134,7 @@ public:
     int vTime;
     QmlTimeLine velocityTimeline;
     QmlGraphicsFlickableVisibleArea *visibleArea;
+    QmlGraphicsFlickable::FlickDirection flickDirection;
 
     void handleMousePressEvent(QGraphicsSceneMouseEvent *);
     void handleMouseMoveEvent(QGraphicsSceneMouseEvent *);
diff --git a/src/declarative/graphicsitems/qmlgraphicsgridview.cpp b/src/declarative/graphicsitems/qmlgraphicsgridview.cpp
index f223413..cb6e675 100644
--- a/src/declarative/graphicsitems/qmlgraphicsgridview.cpp
+++ b/src/declarative/graphicsitems/qmlgraphicsgridview.cpp
@@ -327,6 +327,7 @@ void QmlGraphicsGridViewPrivate::init()
     q->setFlag(QGraphicsItem::ItemIsFocusScope);
     QObject::connect(q, SIGNAL(widthChanged()), q, SLOT(sizeChange()));
     QObject::connect(q, SIGNAL(heightChanged()), q, SLOT(sizeChange()));
+    q->setFlickDirection(QmlGraphicsFlickable::VerticalFlick);
 }
 
 void QmlGraphicsGridViewPrivate::clear()
@@ -1014,10 +1015,13 @@ void QmlGraphicsGridView::setFlow(Flow flow)
     Q_D(QmlGraphicsGridView);
     if (d->flow != flow) {
         d->flow = flow;
-        if (d->flow == LeftToRight)
+        if (d->flow == LeftToRight) {
             setViewportWidth(-1);
-        else
+            setFlickDirection(QmlGraphicsFlickable::VerticalFlick);
+        } else {
             setViewportHeight(-1);
+            setFlickDirection(QmlGraphicsFlickable::HorizontalFlick);
+        }
         d->clear();
         d->updateGrid();
         refill();
diff --git a/src/declarative/graphicsitems/qmlgraphicslistview.cpp b/src/declarative/graphicsitems/qmlgraphicslistview.cpp
index c4edbb7..eb7a026 100644
--- a/src/declarative/graphicsitems/qmlgraphicslistview.cpp
+++ b/src/declarative/graphicsitems/qmlgraphicslistview.cpp
@@ -490,6 +490,7 @@ void QmlGraphicsListViewPrivate::init()
     QObject::connect(q, SIGNAL(heightChanged()), q, SLOT(refill()));
     QObject::connect(q, SIGNAL(widthChanged()), q, SLOT(refill()));
     QObject::connect(q, SIGNAL(movementEnded()), q, SLOT(animStopped()));
+    q->setFlickDirection(QmlGraphicsFlickable::VerticalFlick);
 }
 
 void QmlGraphicsListViewPrivate::clear()
@@ -1667,10 +1668,13 @@ void QmlGraphicsListView::setOrientation(QmlGraphicsListView::Orientation orient
     Q_D(QmlGraphicsListView);
     if (d->orient != orientation) {
         d->orient = orientation;
-        if (d->orient == QmlGraphicsListView::Vertical)
+        if (d->orient == QmlGraphicsListView::Vertical) {
             setViewportWidth(-1);
-        else
+            setFlickDirection(VerticalFlick);
+        } else {
             setViewportHeight(-1);
+            setFlickDirection(HorizontalFlick);
+        }
         d->clear();
         refill();
         emit orientationChanged();
@@ -2131,6 +2135,8 @@ void QmlGraphicsListView::trackedPositionChanged()
                     pos = d->startPosition();
                 } else if (d->trackedItem->endPosition() > d->endPosition() - d->size() + d->highlightRangeEnd) {
                     pos = d->endPosition() - d->size();
+                    if (pos < d->startPosition())
+                        pos = d->startPosition();
                 } else {
                     if (trackedPos < viewPos + d->highlightRangeStart) {
                         pos = trackedPos - d->highlightRangeStart;
diff --git a/src/declarative/qml/qmlboundsignal.cpp b/src/declarative/qml/qmlboundsignal.cpp
index 4a0577a..78bcd49 100644
--- a/src/declarative/qml/qmlboundsignal.cpp
+++ b/src/declarative/qml/qmlboundsignal.cpp
@@ -93,7 +93,7 @@ QmlAbstractBoundSignal::~QmlAbstractBoundSignal()
 
 QmlBoundSignal::QmlBoundSignal(QObject *scope, const QMetaMethod &signal, 
                                QObject *parent)
-: m_expression(0), m_idx(signal.methodIndex()), m_params(0)
+: m_expression(0), m_signal(signal), m_paramsValid(false), m_params(0)
 {
     // A cached evaluation of the QmlExpression::value() slot index.
     //
@@ -103,16 +103,13 @@ QmlBoundSignal::QmlBoundSignal(QObject *scope, const QMetaMethod &signal,
     if (evaluateIdx == -1) evaluateIdx = metaObject()->methodCount();
 
     QmlGraphics_setParent_noEvent(this, parent);
-    QMetaObject::connect(scope, m_idx, this, evaluateIdx);
-
-    if (!signal.parameterTypes().isEmpty())
-        m_params = new QmlBoundSignalParameters(signal, this);
+    QMetaObject::connect(scope, m_signal.methodIndex(), this, evaluateIdx);
 }
 
 QmlBoundSignal::QmlBoundSignal(QmlContext *ctxt, const QString &val, 
                                QObject *scope, const QMetaMethod &signal,
                                QObject *parent)
-: m_expression(0), m_idx(signal.methodIndex()), m_params(0)
+: m_expression(0), m_signal(signal), m_paramsValid(false), m_params(0)
 {
     // A cached evaluation of the QmlExpression::value() slot index.
     //
@@ -122,13 +119,10 @@ QmlBoundSignal::QmlBoundSignal(QmlContext *ctxt, const QString &val,
     if (evaluateIdx == -1) evaluateIdx = metaObject()->methodCount();
 
     QmlGraphics_setParent_noEvent(this, parent);
-    QMetaObject::connect(scope, m_idx, this, evaluateIdx);
+    QMetaObject::connect(scope, m_signal.methodIndex(), this, evaluateIdx);
 
     m_expression = new QmlExpression(ctxt, val, scope);
     m_expression->setTrackChange(false);
-
-    if (!signal.parameterTypes().isEmpty())
-        m_params = new QmlBoundSignalParameters(signal, this);
 }
 
 QmlBoundSignal::~QmlBoundSignal()
@@ -139,7 +133,7 @@ QmlBoundSignal::~QmlBoundSignal()
 
 int QmlBoundSignal::index() const 
 { 
-    return m_idx; 
+    return m_signal.methodIndex();
 }
 
 /*!
@@ -174,6 +168,12 @@ QmlBoundSignal *QmlBoundSignal::cast(QObject *o)
 int QmlBoundSignal::qt_metacall(QMetaObject::Call c, int id, void **a)
 {
     if (c == QMetaObject::InvokeMetaMethod && id == evaluateIdx) {
+        if (!m_paramsValid) {
+            if (!m_signal.parameterTypes().isEmpty())
+                m_params = new QmlBoundSignalParameters(m_signal, this);
+            m_paramsValid = true;
+        }
+
         if (m_params) m_params->setValues(a);
         if (m_expression) {
             QmlExpressionPrivate::get(m_expression)->value(m_params);
diff --git a/src/declarative/qml/qmlboundsignal_p.h b/src/declarative/qml/qmlboundsignal_p.h
index e801892..53a5a6b 100644
--- a/src/declarative/qml/qmlboundsignal_p.h
+++ b/src/declarative/qml/qmlboundsignal_p.h
@@ -55,6 +55,7 @@
 
 #include <qmlexpression.h>
 #include <private/qobject_p.h>
+#include <QtCore/qmetaobject.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -87,7 +88,8 @@ protected:
 
 private:
     QmlExpression *m_expression;
-    int m_idx;
+    QMetaMethod m_signal;
+    bool m_paramsValid;
     QmlBoundSignalParameters *m_params;
 };
 
diff --git a/src/declarative/qml/qmlcompileddata.cpp b/src/declarative/qml/qmlcompileddata.cpp
index 44d2745..9b931c5 100644
--- a/src/declarative/qml/qmlcompileddata.cpp
+++ b/src/declarative/qml/qmlcompileddata.cpp
@@ -167,7 +167,8 @@ QmlCompiledData::~QmlCompiledData()
     if (importCache)
         importCache->release();
 
-    qDeleteAll(programs);
+    qDeleteAll(cachedPrograms);
+    qDeleteAll(cachedClosures);
 }
 
 QObject *QmlCompiledData::TypeReference::createInstance(QmlContext *ctxt, const QBitField &bindings) const
diff --git a/src/declarative/qml/qmlcompiler.cpp b/src/declarative/qml/qmlcompiler.cpp
index ee0c484..8edf023 100644
--- a/src/declarative/qml/qmlcompiler.cpp
+++ b/src/declarative/qml/qmlcompiler.cpp
@@ -2529,12 +2529,26 @@ bool QmlCompiler::completeComponentBuild()
 
             // Pre-rewrite the expression
             QString expression = binding.expression.asScript();
+
+            // ### Optimize
+            QmlRewrite::SharedBindingTester sharableTest;
+            bool isSharable = sharableTest.isSharable(expression);
+            
             QmlRewrite::RewriteBinding rewriteBinding;
             expression = rewriteBinding(expression);
 
             quint32 length = expression.length();
-            quint32 pc = output->programs.length();
-            output->programs.append(0);
+            quint32 pc; 
+            
+            if (isSharable) {
+                pc = output->cachedClosures.count();
+                pc |= 0x80000000;
+                output->cachedClosures.append(0);
+            } else {
+                pc = output->cachedPrograms.length();
+                output->cachedPrograms.append(0);
+            }
+
             binding.compiledData =
                 QByteArray((const char *)&pc, sizeof(quint32)) +
                 QByteArray((const char *)&length, sizeof(quint32)) +
diff --git a/src/declarative/qml/qmlcompiler_p.h b/src/declarative/qml/qmlcompiler_p.h
index 6b41a5f..991ae81 100644
--- a/src/declarative/qml/qmlcompiler_p.h
+++ b/src/declarative/qml/qmlcompiler_p.h
@@ -113,7 +113,8 @@ public:
     QList<QByteArray> datas;
     QList<QmlParser::Location> locations;
     QList<QmlInstruction> bytecode;
-    QList<QScriptProgram *> programs;
+    QList<QScriptProgram *> cachedPrograms;
+    QList<QScriptValue *> cachedClosures;
     QList<QmlPropertyCache *> propertyCaches;
     QList<QmlIntegerCache *> contextCaches;
     QList<QmlParser::Object::ScriptBlock> scripts;
diff --git a/src/declarative/qml/qmlcomponent.cpp b/src/declarative/qml/qmlcomponent.cpp
index 1e03557..2e8e4ce 100644
--- a/src/declarative/qml/qmlcomponent.cpp
+++ b/src/declarative/qml/qmlcomponent.cpp
@@ -705,7 +705,7 @@ void QmlComponentPrivate::completeCreate()
             QmlEnginePrivate::SimpleList<QmlParserStatus> ps = 
                 parserStatus.at(ii);
 
-            for (int jj = 0; jj < ps.count; ++jj) {
+            for (int jj = ps.count - 1; jj >= 0; --jj) {
                 QmlParserStatus *status = ps.at(jj);
                 if (status && status->d) {
                     status->d = 0;
diff --git a/src/declarative/qml/qmlcontextscriptclass.cpp b/src/declarative/qml/qmlcontextscriptclass.cpp
index acf6203..c740ce7 100644
--- a/src/declarative/qml/qmlcontextscriptclass.cpp
+++ b/src/declarative/qml/qmlcontextscriptclass.cpp
@@ -47,9 +47,27 @@
 QT_BEGIN_NAMESPACE
 
 struct ContextData : public QScriptDeclarativeClass::Object {
-    ContextData(QmlContext *c, QObject *o) : context(c), scopeObject(o) {}
+    ContextData() : isSharedContext(true) {}
+    ContextData(QmlContext *c, QObject *o) : context(c), scopeObject(o), isSharedContext(false) {}
     QGuard<QmlContext> context;
     QGuard<QObject> scopeObject;
+    bool isSharedContext;
+
+    QmlContext *getContext(QmlEngine *engine) {
+        if (isSharedContext) {
+            return QmlEnginePrivate::get(engine)->sharedContext;
+        } else {
+            return context.data();
+        }
+    }
+
+    QObject *getScope(QmlEngine *engine) {
+        if (isSharedContext) {
+            return QmlEnginePrivate::get(engine)->sharedScope;
+        } else {
+            return scopeObject.data();
+        }
+    }
 };
 
 /*
@@ -73,13 +91,20 @@ QScriptValue QmlContextScriptClass::newContext(QmlContext *context, QObject *sco
     return newObject(scriptEngine, this, new ContextData(context, scopeObject));
 }
 
+QScriptValue QmlContextScriptClass::newSharedContext()
+{
+    QScriptEngine *scriptEngine = QmlEnginePrivate::getScriptEngine(engine);
+
+    return newObject(scriptEngine, this, new ContextData());
+}
+
 QmlContext *QmlContextScriptClass::contextFromValue(const QScriptValue &v)
 {
     if (scriptClass(v) != this)
         return 0;
 
     ContextData *data = (ContextData *)object(v);
-    return data->context;
+    return data->getContext(engine);
 }
 
 QScriptClass::QueryFlags 
@@ -94,8 +119,8 @@ QmlContextScriptClass::queryProperty(Object *object, const Identifier &name,
     lastPropertyIndex = -1;
     lastDefaultObject = -1;
 
-    QmlContext *bindContext = ((ContextData *)object)->context.data();
-    QObject *scopeObject = ((ContextData *)object)->scopeObject.data();
+    QmlContext *bindContext = ((ContextData *)object)->getContext(engine);
+    QObject *scopeObject = ((ContextData *)object)->getScope(engine);
     if (!bindContext)
         return 0;
 
diff --git a/src/declarative/qml/qmlcontextscriptclass_p.h b/src/declarative/qml/qmlcontextscriptclass_p.h
index cf91242..d24dfa6 100644
--- a/src/declarative/qml/qmlcontextscriptclass_p.h
+++ b/src/declarative/qml/qmlcontextscriptclass_p.h
@@ -68,6 +68,7 @@ public:
     ~QmlContextScriptClass();
 
     QScriptValue newContext(QmlContext *, QObject * = 0);
+    QScriptValue newSharedContext();
 
     QmlContext *contextFromValue(const QScriptValue &);
 
diff --git a/src/declarative/qml/qmlengine.cpp b/src/declarative/qml/qmlengine.cpp
index 0221458..f136017 100644
--- a/src/declarative/qml/qmlengine.cpp
+++ b/src/declarative/qml/qmlengine.cpp
@@ -110,7 +110,7 @@ struct StaticQtMetaObject : public QObject
 
 QmlEnginePrivate::QmlEnginePrivate(QmlEngine *e)
 : rootContext(0), currentExpression(0),
-  isDebugging(false), contextClass(0), objectClass(0), valueTypeClass(0), globalClass(0),
+  isDebugging(false), contextClass(0), sharedContext(0), sharedScope(0), objectClass(0), valueTypeClass(0), globalClass(0),
   nodeListClass(0), namedNodeMapClass(0), sqlQueryClass(0), cleanup(0), erroredBindings(0), 
   inProgressCreations(0), scriptEngine(this), workerScriptEngine(0), componentAttacheds(0), 
   rootComponent(0), networkAccessManager(0), typeManager(e), uniqueId(1)
@@ -160,6 +160,10 @@ QmlEnginePrivate::QmlEnginePrivate(QmlEngine *e)
     scriptEngine.globalObject().setProperty(QLatin1String("createComponent"),
             scriptEngine.newFunction(QmlEnginePrivate::createComponent, 1));
 
+    // translation functions need to be installed
+    // before the global script class is constructed (QTBUG-6437)
+    scriptEngine.installTranslatorFunctions();
+
     globalClass = new QmlGlobalScriptClass(&scriptEngine);
 }
 
@@ -226,8 +230,8 @@ void QmlEnginePrivate::init()
     Q_Q(QmlEngine);
     qRegisterMetaType<QVariant>("QVariant");
     qRegisterMetaType<QmlScriptString>("QmlScriptString");
+    qRegisterMetaType<QScriptValue>("QScriptValue");
 
-    scriptEngine.installTranslatorFunctions();
     contextClass = new QmlContextScriptClass(q);
     objectClass = new QmlObjectScriptClass(q);
     valueTypeClass = new QmlValueTypeScriptClass(q);
diff --git a/src/declarative/qml/qmlengine_p.h b/src/declarative/qml/qmlengine_p.h
index 93fe4a7..9267a66 100644
--- a/src/declarative/qml/qmlengine_p.h
+++ b/src/declarative/qml/qmlengine_p.h
@@ -126,6 +126,8 @@ public:
 
     struct ImportedNamespace;
     QmlContextScriptClass *contextClass;
+    QmlContext *sharedContext;
+    QObject *sharedScope;
     QmlObjectScriptClass *objectClass;
     QmlValueTypeScriptClass *valueTypeClass;
     QmlTypeNameScriptClass *typeNameClass;
diff --git a/src/declarative/qml/qmlexpression.cpp b/src/declarative/qml/qmlexpression.cpp
index d2d60ee..2239d77 100644
--- a/src/declarative/qml/qmlexpression.cpp
+++ b/src/declarative/qml/qmlexpression.cpp
@@ -55,7 +55,7 @@ QT_BEGIN_NAMESPACE
 
 QmlExpressionData::QmlExpressionData()
 : expressionFunctionValid(false), expressionRewritten(false), me(0), 
-  trackChange(true), line(-1), guardList(0), guardListLength(0)
+  trackChange(true), isShared(false), line(-1), guardList(0), guardListLength(0)
 {
 }
 
@@ -108,27 +108,47 @@ void QmlExpressionPrivate::init(QmlContext *ctxt, void *expr, QmlRefCount *rc,
         data->expression = QString::fromRawData((QChar *)(exprData + 3), exprData[2]);
 
         int progIdx = *(exprData + 1);
+        bool isShared = progIdx & 0x80000000;
+        progIdx &= 0x7FFFFFFF;
+
         QmlEngine *engine = ctxt->engine();
         QmlEnginePrivate *ep = QmlEnginePrivate::get(engine);
         QScriptEngine *scriptEngine = QmlEnginePrivate::getScriptEngine(engine);
+
+        if (isShared) {
+
+            if (!dd->cachedClosures.at(progIdx)) {
+                QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);
+                scriptContext->pushScope(ep->contextClass->newSharedContext());
+                dd->cachedClosures[progIdx] = new QScriptValue(scriptEngine->evaluate(data->expression, data->url.toString(), data->line));
+                scriptEngine->popContext();
+            }
+
+            data->expressionFunction = *dd->cachedClosures.at(progIdx);
+            data->isShared = true;
+            data->expressionFunctionValid = true;
+
+        } else {
+
 #if !defined(Q_OS_SYMBIAN) //XXX Why doesn't this work?
-        if (!dd->programs.at(progIdx)) {
-            dd->programs[progIdx] =
-                new QScriptProgram(data->expression, data->url.toString(), data->line);
-        }
+            if (!dd->cachedPrograms.at(progIdx)) {
+                dd->cachedPrograms[progIdx] =
+                    new QScriptProgram(data->expression, data->url.toString(), data->line);
+            }
 #endif
 
-        QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);
-        scriptContext->pushScope(ep->contextClass->newContext(ctxt, me));
+            QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);
+            scriptContext->pushScope(ep->contextClass->newContext(ctxt, me));
 
 #if !defined(Q_OS_SYMBIAN) 
-        data->expressionFunction = scriptEngine->evaluate(*dd->programs[progIdx]);
+            data->expressionFunction = scriptEngine->evaluate(*dd->cachedPrograms.at(progIdx));
 #else
-        data->expressionFunction = scriptEngine->evaluate(data->expression);
+            data->expressionFunction = scriptEngine->evaluate(data->expression);
 #endif
 
-        data->expressionFunctionValid = true;
-        scriptEngine->popContext();
+            data->expressionFunctionValid = true;
+            scriptEngine->popContext();
+        }
     }
 
     data->QmlAbstractExpression::setContext(ctxt);
@@ -328,8 +348,22 @@ QVariant QmlExpressionPrivate::evalQtScript(QObject *secondaryScope, bool *isUnd
         data->expressionFunctionValid = true;
     }
 
+    QmlContext *oldSharedContext = 0;
+    QObject *oldSharedScope = 0;
+    if (data->isShared) {
+        oldSharedContext = ep->sharedContext;
+        oldSharedScope = ep->sharedScope;
+        ep->sharedContext = data->context();
+        ep->sharedScope = data->me;
+    }
+
     QScriptValue svalue = data->expressionFunction.call();
 
+    if (data->isShared) {
+        ep->sharedContext = oldSharedContext;
+        ep->sharedScope = oldSharedScope;
+    }
+
     if (isUndefined)
         *isUndefined = svalue.isUndefined() || scriptEngine->hasUncaughtException();
 
diff --git a/src/declarative/qml/qmlexpression_p.h b/src/declarative/qml/qmlexpression_p.h
index c6ba54d..dbb12ba 100644
--- a/src/declarative/qml/qmlexpression_p.h
+++ b/src/declarative/qml/qmlexpression_p.h
@@ -101,6 +101,8 @@ public:
     QObject *me;
     bool trackChange;
 
+    bool isShared;
+
     QUrl url;
     int line;
 
diff --git a/src/declarative/qml/qmlmetatype.cpp b/src/declarative/qml/qmlmetatype.cpp
index 5172152..06927457 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 "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 5110ea0..7c4ce5b 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 c5cdbaa..0e7da84 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 28dd66d..9265910 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/qmlrewrite.cpp b/src/declarative/qml/qmlrewrite.cpp
index dc90255..5fcebf4d 100644
--- a/src/declarative/qml/qmlrewrite.cpp
+++ b/src/declarative/qml/qmlrewrite.cpp
@@ -49,6 +49,22 @@ DEFINE_BOOL_CONFIG_OPTION(rewriteDump, QML_REWRITE_DUMP);
 
 namespace QmlRewrite {
 
+bool SharedBindingTester::isSharable(const QString &code)
+{
+    Engine engine;
+    NodePool pool(QString(), &engine);
+    Lexer lexer(&engine);
+    Parser parser(&engine);
+    lexer.setCode(code, 0);
+    parser.parseStatement();
+    if (!parser.statement()) 
+        return false;
+
+    _sharable = true;
+    AST::Node::acceptChild(parser.statement(), this);
+    return _sharable;
+}
+
 QString RewriteBinding::operator()(const QString &code, bool *ok)
 {
     Engine engine;
diff --git a/src/declarative/qml/qmlrewrite_p.h b/src/declarative/qml/qmlrewrite_p.h
index a5cb841..a04a0db 100644
--- a/src/declarative/qml/qmlrewrite_p.h
+++ b/src/declarative/qml/qmlrewrite_p.h
@@ -63,6 +63,17 @@ QT_BEGIN_NAMESPACE
 namespace QmlRewrite {
 using namespace QmlJS;
 
+class SharedBindingTester : protected AST::Visitor
+{
+    bool _sharable;
+public:
+    bool isSharable(const QString &code);
+    
+    virtual bool visit(AST::FunctionDeclaration *) { _sharable = false; return false; }
+    virtual bool visit(AST::FunctionExpression *) { _sharable = false; return false; }
+    virtual bool visit(AST::CallExpression *) { _sharable = false; return false; }
+};
+
 class RewriteBinding: protected AST::Visitor
 {
     unsigned _position;
diff --git a/src/declarative/qml/qmlworkerscript.cpp b/src/declarative/qml/qmlworkerscript.cpp
index 75c67cc..a41d9c5 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 b85238d..96394ae 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);
diff --git a/tests/benchmarks/declarative/qmltime/example.qml b/tests/benchmarks/declarative/qmltime/example.qml
new file mode 100644
index 0000000..68889f0
--- /dev/null
+++ b/tests/benchmarks/declarative/qmltime/example.qml
@@ -0,0 +1,14 @@
+import Qt 4.6
+import QmlTime 1.0 as QmlTime
+
+Item {
+
+    property string name: "Bob Smith"
+
+    QmlTime.Timer {
+        component: Item {
+            Text { text: name }
+        }
+    }
+}
+
diff --git a/tests/benchmarks/declarative/qmltime/qmltime.cpp b/tests/benchmarks/declarative/qmltime/qmltime.cpp
new file mode 100644
index 0000000..27019f4
--- /dev/null
+++ b/tests/benchmarks/declarative/qmltime/qmltime.cpp
@@ -0,0 +1,133 @@
+#include <QmlEngine>
+#include <QmlComponent>
+#include <QDebug>
+#include <QApplication>
+#include <QTime>
+#include <QmlContext>
+
+class Timer : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QmlComponent *component READ component WRITE setComponent);
+
+public:
+    Timer();
+
+    QmlComponent *component() const;
+    void setComponent(QmlComponent *);
+
+    static Timer *timerInstance();
+
+    void run(uint);
+
+private:
+    QmlComponent *m_component;
+    static Timer *m_timer;
+};
+QML_DECLARE_TYPE(Timer);
+QML_DEFINE_TYPE(QmlTime, 1, 0, Timer, Timer);
+
+Timer *Timer::m_timer = 0;
+
+Timer::Timer()
+: m_component(0)
+{
+    if (m_timer)
+        qWarning("Timer: Timer already registered");
+    m_timer = this;
+}
+
+QmlComponent *Timer::component() const
+{
+    return m_component;
+}
+
+void Timer::setComponent(QmlComponent *c)
+{
+    m_component = c;
+}
+
+Timer *Timer::timerInstance()
+{
+    return m_timer;
+}
+
+void Timer::run(uint iterations)
+{
+    QmlContext context(qmlContext(this));
+
+    QTime t;
+    t.start();
+    for (uint ii = 0; ii < iterations; ++ii) {
+        QObject *o = m_component->create(&context);
+        delete o;
+    }
+
+    int e = t.elapsed();
+
+    qWarning() << "Total:" << e << "ms, Per iteration:" << qreal(e) / qreal(iterations) << "ms";
+
+}
+
+void usage(const char *name)
+{
+    qWarning("Usage: %s [-iterations <count>] <qml file>", name);
+    exit(-1);
+}
+
+int main(int argc, char ** argv)
+{
+    QApplication app(argc, argv);
+
+    uint iterations = 1024;
+    QString filename;
+
+    for (int ii = 1; ii < argc; ++ii) {
+        QByteArray arg(argv[ii]);
+
+        if (arg == "-iterations") {
+            if (ii + 1 < argc) {
+                ++ii;
+                QByteArray its(argv[ii]);
+                bool ok = false;
+                iterations = its.toUInt(&ok);
+                if (!ok)
+                    usage(argv[0]);
+            } else {
+                usage(argv[0]);
+            }
+        } else {
+            filename = QLatin1String(argv[ii]);
+        }
+    }
+
+    QmlEngine engine;
+    QmlComponent component(&engine, filename);
+    if (component.isError()) {
+        qWarning() << component.errors();
+        return -1;
+    }
+
+    QObject *obj = component.create();
+    if (!obj) {
+        qWarning() << component.errors();
+        return -1;
+    }
+
+    Timer *timer = Timer::timerInstance();
+    if (!timer) {
+        qWarning() << "A Tester.Timer instance is required.";
+        return -1;
+    }
+
+    if (!timer->component()) {
+        qWarning() << "The timer has no component";
+        return -1;
+    }
+
+    timer->run(iterations);
+
+    return 0;
+}
+
+#include "qmltime.moc"
diff --git a/tests/benchmarks/declarative/qmltime/qmltime.pro b/tests/benchmarks/declarative/qmltime/qmltime.pro
new file mode 100644
index 0000000..b077d1a
--- /dev/null
+++ b/tests/benchmarks/declarative/qmltime/qmltime.pro
@@ -0,0 +1,8 @@
+load(qttest_p4)
+TEMPLATE = app
+TARGET = qmltime
+QT += declarative
+macx:CONFIG -= app_bundle
+
+SOURCES += qmltime.cpp 
+