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

32 files changed, 536 insertions, 339 deletions

diff --git a/src/corelib/kernel/qmetaobject.cpp b/src/corelib/kernel/qmetaobject.cpp
index f98c449..10eb955 100644
--- a/src/corelib/kernel/qmetaobject.cpp
+++ b/src/corelib/kernel/qmetaobject.cpp
@@ -2237,7 +2237,10 @@ bool QMetaProperty::write(QObject *object, const QVariant &value) const
     // -1 (unchanged): normal qt_metacall, result stored in argv[0]
     // changed: result stored directly in value, return the value of status
     int status = -1;
-    void *argv[] = { 0, &v, &status };
+    // the flags variable is used by the declarative module to implement
+    // interception of property writes.
+    int flags = 0;
+    void *argv[] = { 0, &v, &status, &flags };
     if (t == QVariant::LastType)
         argv[0] = &v;
     else
diff --git a/src/declarative/extra/qmlbehavior.cpp b/src/declarative/extra/qmlbehavior.cpp
index 7784ef5..e30bd39 100644
--- a/src/declarative/extra/qmlbehavior.cpp
+++ b/src/declarative/extra/qmlbehavior.cpp
@@ -44,180 +44,77 @@
 #include "qmltransition.h"
 #include "qmlbehavior.h"
 #include <QtDeclarative/qmlcontext.h>
+#include <QtDeclarative/qmlinfo.h>
 #include <QtCore/qparallelanimationgroup.h>
 
 QT_BEGIN_NAMESPACE
 
 QML_DEFINE_TYPE(Qt,4,6,(QT_VERSION&0x00ff00)>>8,Behavior,QmlBehavior)
 
-class QmlBehaviorData : public QObject
-{
-Q_OBJECT
-public:
-    QmlBehaviorData(QObject *parent)
-        : QObject(parent) {}
-
-    Q_PROPERTY(QVariant endValue READ endValue NOTIFY valuesChanged)
-    Q_PROPERTY(QVariant startValue READ startValue NOTIFY valuesChanged)
-    QVariant endValue() const { return e; }
-    QVariant startValue() const { return s; }
-
-    QVariant e;
-    QVariant s;
-
-Q_SIGNALS:
-    void valuesChanged();
-
-private:
-    friend class QmlBehavior;
-};
-
 class QmlBehaviorPrivate : public QObjectPrivate
 {
+    Q_DECLARE_PUBLIC(QmlBehavior)
 public:
-    QmlBehaviorPrivate() : operations(this) {}
+    QmlBehaviorPrivate() : animation(0) {}
+
     QmlMetaProperty property;
     QVariant currentValue;
-
-    QVariant fromValue;
-    QVariant toValue;
-    class AnimationList : public QmlConcreteList<QmlAbstractAnimation *>
-    {
-    public:
-        AnimationList(QmlBehaviorPrivate *parent) : _parent(parent) {}
-        virtual void append(QmlAbstractAnimation *a)
-        {
-            QmlConcreteList<QmlAbstractAnimation *>::append(a);
-            _parent->group->addAnimation(a->qtAnimation());
-            if (_parent->property.isValid()) {
-                a->setTarget(_parent->property);
-            }
-        }
-        virtual void clear() {  QmlConcreteList<QmlAbstractAnimation *>::clear(); } //###
-    private:
-        QmlBehaviorPrivate *_parent;
-    };
-    AnimationList operations;
-    QParallelAnimationGroup *group;
+    QmlAbstractAnimation *animation;
 };
 
-/*!
-    \qmlclass Behavior QmlBehavior
-    \brief The Behavior element allows you to specify a default animation for a property change.
-
-    In example below, the rect will use a bounce easing curve over 200 millisecond for any changes to its y property:
-    \code
-    Rectangle {
-        width: 20; height: 20
-        color: "#00ff00"
-        y: 200  //initial value
-        y: Behavior {
-            NumberAnimation {
-                easing: "easeOutBounce(amplitude:100)"
-                duration: 200
-            }
-        }
-    }
-    \endcode
-*/
-
 QmlBehavior::QmlBehavior(QObject *parent)
-: QObject(*(new QmlBehaviorPrivate), parent)
-{
-    Q_D(QmlBehavior);
-    d->group = new QParallelAnimationGroup;
-    QFx_setParent_noEvent(d->group, this);
-}
-
-/*!
-    \qmlproperty QVariant Behavior::from
-    This property holds a selector specifying a starting value for the behavior.
-
-    If you only want the behavior to apply when the change starts at a
-    specific value you can specify fromValue. This selector is used in conjunction
-    with the to selector.
-*/
-
-QVariant QmlBehavior::fromValue() const
+    : QObject(*(new QmlBehaviorPrivate), parent)
 {
-    Q_D(const QmlBehavior);
-    return d->fromValue;
 }
 
-void QmlBehavior::setFromValue(const QVariant &v)
+QmlAbstractAnimation *QmlBehavior::animation()
 {
     Q_D(QmlBehavior);
-    d->fromValue = v;
+    return d->animation;
 }
 
-/*!
-    \qmlproperty QVariant Behavior::to
-    This property holds a selector specifying a ending value for the behavior.
-
-    If you only want the behavior to apply when the change ends at a
-    specific value you can specify toValue. This selector is used in conjunction
-    with the from selector.
-*/
-
-QVariant QmlBehavior::toValue() const
-{
-    Q_D(const QmlBehavior);
-    return d->toValue;
-}
-
-void QmlBehavior::setToValue(const QVariant &v)
+void QmlBehavior::setAnimation(QmlAbstractAnimation *animation)
 {
     Q_D(QmlBehavior);
-    d->toValue = v;
-}
+    if (d->animation) {
+        qmlInfo(this) << "Can't change the animation assigned to a Behavior.";
+        return;
+    }
 
-QmlList<QmlAbstractAnimation *>* QmlBehavior::operations()
-{
-    Q_D(QmlBehavior);
-    return &d->operations;
+    d->animation = animation;
+    if (d->animation)
+        d->animation->setTarget(d->property);
 }
 
 QmlBehavior::~QmlBehavior()
 {
-    //### do we need any other cleanup here?
 }
 
-bool QmlBehavior::_ignore = false;
-void QmlBehavior::propertyValueChanged()
+void QmlBehavior::write(const QVariant &value)
 {
     Q_D(QmlBehavior);
-    if (_ignore)
+    if (!d->animation) {
+        d->property.write(value, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
         return;
+    }
 
-    QVariant newValue = d->property.read();
-
-    if ((!fromValue().isValid() || fromValue() == d->currentValue) &&
-       (!toValue().isValid() || toValue() == newValue)) {
-
-        //### does this clean up everything needed?
-        d->group->stop();
-
-        QmlStateOperation::ActionList actions;
-        Action action;
-        action.property = d->property;
-        action.fromValue = d->currentValue;
-        action.toValue = newValue;
-        actions << action;
+    d->currentValue = d->property.read();
 
-        _ignore = true;
-        d->property.write(d->currentValue);
+    d->animation->qtAnimation()->stop();
 
-        QList<QmlMetaProperty> after;
-        for (int ii = 0; ii < d->operations.count(); ++ii) {
-            d->operations.at(ii)->transition(actions, after, QmlAbstractAnimation::Forward);
-        }
-        d->group->start();
-        if (!after.contains(d->property))
-            d->property.write(newValue);
-        _ignore = false;
-    }
+    QmlStateOperation::ActionList actions;
+    Action action;
+    action.property = d->property;
+    action.fromValue = d->currentValue;
+    action.toValue = value;
+    actions << action;
 
-    d->currentValue = newValue;
+    QList<QmlMetaProperty> after;
+    if (d->animation)
+        d->animation->transition(actions, after, QmlAbstractAnimation::Forward);
+    d->animation->qtAnimation()->start();
+    if (!after.contains(d->property))
+        d->property.write(value, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
 }
 
 void QmlBehavior::setTarget(const QmlMetaProperty &property)
@@ -225,12 +122,8 @@ void QmlBehavior::setTarget(const QmlMetaProperty &property)
     Q_D(QmlBehavior);
     d->property = property;
     d->currentValue = property.read();
-    d->property.connectNotifier(this, SLOT(propertyValueChanged()));
-    for (int ii = 0; ii < d->operations.count(); ++ii) {
-        d->operations.at(ii)->setTarget(property);
-    }
+    if (d->animation)
+        d->animation->setTarget(property);
 }
 
 QT_END_NAMESPACE
-
-#include "qmlbehavior.moc"
diff --git a/src/declarative/extra/qmlbehavior.h b/src/declarative/extra/qmlbehavior.h
index a4a0679..994d85c 100644
--- a/src/declarative/extra/qmlbehavior.h
+++ b/src/declarative/extra/qmlbehavior.h
@@ -43,6 +43,7 @@
 #define QMLBEHAVIOR_H
 
 #include <QtDeclarative/qmlpropertyvaluesource.h>
+#include <QtDeclarative/qmlpropertyvalueinterceptor.h>
 #include <QtDeclarative/qml.h>
 #include <QtDeclarative/qmlstate.h>
 
@@ -54,32 +55,23 @@ QT_MODULE(Declarative)
 
 class QmlAbstractAnimation;
 class QmlBehaviorPrivate;
-class Q_DECLARATIVE_EXPORT QmlBehavior : public QObject, public QmlPropertyValueSource
+class Q_DECLARATIVE_EXPORT QmlBehavior : public QObject, public QmlPropertyValueInterceptor
 {
     Q_OBJECT
     Q_DECLARE_PRIVATE(QmlBehavior)
 
-    Q_PROPERTY(QVariant from READ fromValue WRITE setFromValue)
-    Q_PROPERTY(QVariant to READ toValue WRITE setToValue)
-    Q_CLASSINFO("DefaultProperty", "operations")
-    Q_PROPERTY(QmlList<QmlAbstractAnimation *>* operations READ operations)
+    Q_CLASSINFO("DefaultProperty", "animation")
+    Q_PROPERTY(QmlAbstractAnimation *animation READ animation WRITE setAnimation)
 
 public:
     QmlBehavior(QObject *parent=0);
     ~QmlBehavior();
 
-    QVariant fromValue() const;
-    void setFromValue(const QVariant &);
-    QVariant toValue() const;
-    void setToValue(const QVariant &);
     virtual void setTarget(const QmlMetaProperty &);
+    virtual void write(const QVariant &value);
 
-    QmlList<QmlAbstractAnimation *>* operations();
-
-    static bool _ignore;
-
-private Q_SLOTS:
-    void propertyValueChanged();
+    QmlAbstractAnimation *animation();
+    void setAnimation(QmlAbstractAnimation *);
 };
 
 QT_END_NAMESPACE
diff --git a/src/declarative/qml/qml.pri b/src/declarative/qml/qml.pri
index a2e2050..2e62a3b 100644
--- a/src/declarative/qml/qml.pri
+++ b/src/declarative/qml/qml.pri
@@ -10,6 +10,7 @@ SOURCES += qml/qmlparser.cpp \
     qml/qmlcontext.cpp \
     qml/qmlcustomparser.cpp \
     qml/qmlpropertyvaluesource.cpp \
+    qml/qmlpropertyvalueinterceptor.cpp \
     qml/qmlproxymetaobject.cpp \
     qml/qmlvme.cpp \
     qml/qmlcompiler.cpp \
@@ -59,6 +60,7 @@ HEADERS += qml/qmlparser_p.h \
     qml/qmlcustomparser_p.h \
     qml/qmlcustomparser_p_p.h \
     qml/qmlpropertyvaluesource.h \
+    qml/qmlpropertyvalueinterceptor.h \
     qml/qmlboundsignal_p.h \
     qml/qmlparserstatus.h \
     qml/qmlproxymetaobject_p.h \
diff --git a/src/declarative/qml/qmlbinding.cpp b/src/declarative/qml/qmlbinding.cpp
index 58ce02c..2435c40 100644
--- a/src/declarative/qml/qmlbinding.cpp
+++ b/src/declarative/qml/qmlbinding.cpp
@@ -97,7 +97,7 @@ QmlMetaProperty QmlBinding::property() const
    return d->bindingData()->property; 
 }
 
-void QmlBinding::update()
+void QmlBinding::update(QmlMetaProperty::WriteFlags flags)
 {
     Q_D(QmlBinding);
 
@@ -119,17 +119,17 @@ void QmlBinding::update()
             int idx = data->property.coreIndex();
             Q_ASSERT(idx != -1);
 
-            void *a[1];
+
             QmlBinding *t = this;
-            a[0] = (void *)&t;
-            QMetaObject::metacall(data->property.object(), 
+            int status = -1;
+            void *a[] = { &t, 0, &status, &flags };
+            QMetaObject::metacall(data->property.object(),
                                   QMetaObject::WriteProperty,
                                   idx, a);
 
         } else {
-
             QVariant value = this->value();
-            data->property.write(value, QmlMetaProperty::Binding);
+            data->property.write(value, flags);
         }
 
         data->updating = false;
@@ -146,17 +146,17 @@ void QmlBinding::valueChanged()
     update();
 }
 
-void QmlBinding::setEnabled(bool e)
+void QmlBinding::setEnabled(bool e, QmlMetaProperty::WriteFlags flags)
 {
     Q_D(QmlBinding);
     d->bindingData()->enabled = e;
     setTrackChange(e);
 
-    QmlAbstractBinding::setEnabled(e);
+    QmlAbstractBinding::setEnabled(e, flags);
 
     if (e) {
         addToObject(d->bindingData()->property.object());
-        update();
+        update(flags);
     } else {
         removeFromObject();
     }
@@ -231,7 +231,7 @@ QString QmlAbstractBinding::expression() const
     return QLatin1String("<Unknown>");
 }
 
-void QmlAbstractBinding::setEnabled(bool e)
+void QmlAbstractBinding::setEnabled(bool e, QmlMetaProperty::WriteFlags)
 {
     if (e) m_mePtr = 0;
 }
diff --git a/src/declarative/qml/qmlbinding.h b/src/declarative/qml/qmlbinding.h
index 1c0ccf1..6a3e92a 100644
--- a/src/declarative/qml/qmlbinding.h
+++ b/src/declarative/qml/qmlbinding.h
@@ -47,6 +47,7 @@
 #include <QtDeclarative/qml.h>
 #include <QtDeclarative/qmlpropertyvaluesource.h>
 #include <QtDeclarative/qmlexpression.h>
+#include <QtCore/QMetaProperty>
 
 QT_BEGIN_HEADER
 
@@ -62,10 +63,12 @@ public:
 
     virtual QString expression() const;
 
-    virtual void setEnabled(bool) = 0;
+    void setEnabled(bool e) { setEnabled(e, QmlMetaProperty::DontRemoveBinding); }
+    virtual void setEnabled(bool, QmlMetaProperty::WriteFlags) = 0;
     virtual int propertyIndex() = 0;
 
-    virtual void update() = 0;
+    void update() { update(QmlMetaProperty::DontRemoveBinding); }
+    virtual void update(QmlMetaProperty::WriteFlags) = 0;
 
     void addToObject(QObject *);
     void removeFromObject();
@@ -100,12 +103,13 @@ public:
     bool enabled() const;
 
     // Inherited from  QmlAbstractBinding
-    virtual void setEnabled(bool);
+    virtual void setEnabled(bool, QmlMetaProperty::WriteFlags flags);
     virtual int propertyIndex();
+    virtual void update(QmlMetaProperty::WriteFlags flags);
     virtual QString expression() const;
 
 public Q_SLOTS:
-    void update();
+    void update() { update(QmlMetaProperty::DontRemoveBinding); }
 
 protected:
     virtual void valueChanged();
diff --git a/src/declarative/qml/qmlbindingoptimizations.cpp b/src/declarative/qml/qmlbindingoptimizations.cpp
index e4ca358..6dc221e 100644
--- a/src/declarative/qml/qmlbindingoptimizations.cpp
+++ b/src/declarative/qml/qmlbindingoptimizations.cpp
@@ -69,16 +69,16 @@ QmlBinding_Id::~QmlBinding_Id()
     removeFromContext();
 }
 
-void QmlBinding_Id::setEnabled(bool e)
+void QmlBinding_Id::setEnabled(bool e, QmlMetaProperty::WriteFlags flags)
 {
     if (e) {
         addToObject(m_object);
-        update();
+        update(flags);
     } else {
         removeFromObject();
     }
 
-    QmlAbstractBinding::setEnabled(e);
+    QmlAbstractBinding::setEnabled(e, flags);
 }
 
 int QmlBinding_Id::propertyIndex()
@@ -86,7 +86,7 @@ int QmlBinding_Id::propertyIndex()
     return m_propertyIdx;
 }
 
-void QmlBinding_Id::update()
+void QmlBinding_Id::update(QmlMetaProperty::WriteFlags flags)
 {
     QmlContextPrivate *ctxtPriv = 
         static_cast<QmlContextPrivate *>(QObjectPrivate::get(context()));
@@ -102,7 +102,8 @@ void QmlBinding_Id::update()
         }
 
         QObject *o = ctxtPriv->idValues[m_id].data();
-        void *a[] = { &o, 0 };
+        int status = -1;
+        void *a[] = { &o, 0, &status, &flags };
         QMetaObject::metacall(m_object, QMetaObject::WriteProperty, 
                               m_propertyIdx, a);
     } 
@@ -123,7 +124,9 @@ void QmlBinding_Id::reset()
     removeFromContext();
 
     QObject *o = 0;
-    void *a[] = { &o, 0 };
+    int status = -1;
+    QmlMetaProperty::WriteFlags flags = QmlMetaProperty::DontRemoveBinding;
+    void *a[] = { &o, 0, &status, &flags };
     QMetaObject::metacall(m_object, QMetaObject::WriteProperty, 
                           m_propertyIdx, a);
 }
@@ -150,17 +153,17 @@ QmlBinding_ObjProperty::QmlBinding_ObjProperty(QObject *object, int propertyIdx,
 {
 }
 
-void QmlBinding_ObjProperty::setEnabled(bool e)
+void QmlBinding_ObjProperty::setEnabled(bool e, QmlMetaProperty::WriteFlags flags)
 {
     m_enabled = e;
     if (e) {
         addToObject(m_object);
-        update();
+        update(flags);
     } else {
         removeFromObject();
     }
 
-    QmlAbstractBinding::setEnabled(e);
+    QmlAbstractBinding::setEnabled(e, flags);
 }
 
 int QmlBinding_ObjProperty::propertyIndex()
@@ -168,21 +171,24 @@ int QmlBinding_ObjProperty::propertyIndex()
     return m_propertyIdx;
 }
 
-void QmlBinding_ObjProperty::update()
+void QmlBinding_ObjProperty::update(QmlMetaProperty::WriteFlags flags)
 {
     if (!m_enabled)
         return;
 
     QObject *value = 0;
-    void *a[] = { &value, 0 };
+    int status = -1;
+    void *ra[] = { &value, 0, &status };
 
     // Read
     QMetaObject::metacall(m_context, QMetaObject::ReadProperty, 
-                          m_contextIdx, a);
+                          m_contextIdx, ra);
+
+    void *wa[] = { &value, 0, &status, &flags };
 
     // Write
     QMetaObject::metacall(m_object, QMetaObject::WriteProperty, 
-                          m_propertyIdx, a);
+                          m_propertyIdx, wa);
 
     // Connect notify if needed.  Only need to connect once, so we set
     // m_notifyIdx back to -1 afterwards
diff --git a/src/declarative/qml/qmlbindingoptimizations_p.h b/src/declarative/qml/qmlbindingoptimizations_p.h
index 4862007..d0a4df4 100644
--- a/src/declarative/qml/qmlbindingoptimizations_p.h
+++ b/src/declarative/qml/qmlbindingoptimizations_p.h
@@ -69,9 +69,9 @@ public:
     virtual ~QmlBinding_Id();
 
     // Inherited from QmlAbstractBinding
-    virtual void setEnabled(bool);
+    virtual void setEnabled(bool, QmlMetaProperty::WriteFlags flags);
     virtual int propertyIndex();
-    virtual void update();
+    virtual void update(QmlMetaProperty::WriteFlags flags);
 
     void reset();
 
@@ -96,11 +96,12 @@ public:
                            QObject *context, int contextIdx, int notifyIdx);
 
     // Inherited from QmlAbstractBinding
-    virtual void setEnabled(bool);
+    virtual void setEnabled(bool, QmlMetaProperty::WriteFlags flags);
     virtual int propertyIndex();
+    virtual void update(QmlMetaProperty::WriteFlags flags);
 
 private Q_SLOTS:
-    virtual void update();
+    void update() { update(QmlMetaProperty::DontRemoveBinding); }
 
 private:
     bool m_enabled;
diff --git a/src/declarative/qml/qmlcompiler.cpp b/src/declarative/qml/qmlcompiler.cpp
index 8856892..6fad513 100644
--- a/src/declarative/qml/qmlcompiler.cpp
+++ b/src/declarative/qml/qmlcompiler.cpp
@@ -1531,6 +1531,24 @@ void QmlCompiler::genPropertyAssignment(QmlParser::Property *prop,
             store.assignValueSource.castValue = valueType->propertyValueSourceCast();
             output->bytecode << store;
 
+        } else if (v->type == Value::ValueInterceptor) {
+            genObject(v->object);
+
+            QmlInstruction store;
+            store.type = QmlInstruction::StoreValueInterceptor;
+            store.line = v->object->location.start.line;
+            if (valueTypeProperty) {
+                store.assignValueInterceptor.property = QmlMetaPropertyPrivate::saveValueType(valueTypeProperty->index, prop->index);
+                store.assignValueInterceptor.owner = 1;
+            } else {
+                store.assignValueInterceptor.property =
+                    QmlMetaPropertyPrivate::saveProperty(prop->index);
+                store.assignValueInterceptor.owner = 0;
+            }
+            QmlType *valueType = QmlMetaType::qmlType(v->object->metatype);
+            store.assignValueInterceptor.castValue = valueType->propertyValueInterceptorCast();
+            output->bytecode << store;
+
         } else if (v->type == Value::PropertyBinding) {
 
             genBindingAssignment(v, prop, obj, valueTypeProperty);
@@ -1635,7 +1653,7 @@ bool QmlCompiler::buildAttachedProperty(QmlParser::Property *prop,
 //     font.pointSize: 12
 //     font.family: "Helvetica"
 // }
-// font is a nested property.  size and family are not.
+// font is a nested property.  pointSize and family are not.
 bool QmlCompiler::buildGroupedProperty(QmlParser::Property *prop,
                                        QmlParser::Object *obj,
                                        const BindingContext &ctxt)
@@ -1648,7 +1666,7 @@ bool QmlCompiler::buildGroupedProperty(QmlParser::Property *prop,
             static_cast<QmlEnginePrivate *>(QObjectPrivate::get(engine));
         if (ep->valueTypes[prop->type]) {
             COMPILE_CHECK(buildValueTypeProperty(ep->valueTypes[prop->type],
-                                                 prop->value, ctxt.incr()));
+                                                 prop->value, obj, ctxt.incr()));
             obj->addValueTypeProperty(prop);
         } else {
             COMPILE_EXCEPTION(prop, "Invalid property access");
@@ -1672,6 +1690,7 @@ bool QmlCompiler::buildGroupedProperty(QmlParser::Property *prop,
 
 bool QmlCompiler::buildValueTypeProperty(QObject *type,
                                          QmlParser::Object *obj,
+                                         QmlParser::Object *baseObj,
                                          const BindingContext &ctxt)
 {
     if (obj->defaultProperty)
@@ -1693,13 +1712,16 @@ bool QmlCompiler::buildValueTypeProperty(QObject *type,
 
         if (value->object) {
             bool isPropertyValue = output->types.at(value->object->type).type->propertyValueSourceCast() != -1;
-            if (!isPropertyValue) {
+            bool isPropertyInterceptor = output->types.at(value->object->type).type->propertyValueInterceptorCast() != -1;
+            if (!isPropertyValue && !isPropertyInterceptor) {
                 COMPILE_EXCEPTION(prop, "Invalid property use");
             } else {
                 COMPILE_CHECK(buildObject(value->object, ctxt));
-                value->type = Value::ValueSource;
-            }
 
+                if (isPropertyInterceptor && prop->parent->synthdata.isEmpty())
+                    buildDynamicMeta(baseObj, ForceCreation);
+                value->type = isPropertyValue ? Value::ValueSource : Value::ValueInterceptor;
+            }
         } else if (value->value.isScript()) {
             // ### Check for writability
             BindingReference reference;
@@ -1864,8 +1886,12 @@ bool QmlCompiler::buildPropertyObjectAssignment(QmlParser::Property *prop,
 
         // Will be true if the assigned type inherits QmlPropertyValueSource
         bool isPropertyValue = false;
-        if (QmlType *valueType = QmlMetaType::qmlType(v->object->metatype))
+        // Will be true if the assigned type inherits QmlPropertyValueInterceptor
+        bool isPropertyInterceptor = false;
+        if (QmlType *valueType = QmlMetaType::qmlType(v->object->metatype)) {
             isPropertyValue = valueType->propertyValueSourceCast() != -1;
+            isPropertyInterceptor = valueType->propertyValueInterceptorCast() != -1;
+        }
 
         // We want to raw metaObject here as the raw metaobject is the
         // actual property type before we applied any extensions that might
@@ -1902,11 +1928,13 @@ bool QmlCompiler::buildPropertyObjectAssignment(QmlParser::Property *prop,
             component->getDefaultProperty()->addValue(componentValue);
             v->object = component;
             COMPILE_CHECK(buildPropertyObjectAssignment(prop, obj, v, ctxt));
-        } else if (isPropertyValue) {
+        } else if (isPropertyValue || isPropertyInterceptor) {
             // Assign as a property value source
             COMPILE_CHECK(buildObject(v->object, ctxt));
 
-            v->type = Value::ValueSource;
+            if (isPropertyInterceptor && prop->parent->synthdata.isEmpty())
+                   buildDynamicMeta(prop->parent, ForceCreation);
+            v->type = isPropertyValue ? Value::ValueSource : Value::ValueInterceptor;
         } else {
             COMPILE_EXCEPTION(v->object, "Cannot assign object to property");
         }
@@ -2012,7 +2040,8 @@ bool QmlCompiler::buildDynamicMeta(QmlParser::Object *obj, DynamicMetaMode mode)
     Q_ASSERT(obj);
     Q_ASSERT(obj->metatype);
 
-    if (obj->dynamicProperties.isEmpty() &&
+    if (mode != ForceCreation &&
+        obj->dynamicProperties.isEmpty() &&
         obj->dynamicSignals.isEmpty() &&
         obj->dynamicSlots.isEmpty())
         return true;
diff --git a/src/declarative/qml/qmlcompiler_p.h b/src/declarative/qml/qmlcompiler_p.h
index 1d27342..3a35d58 100644
--- a/src/declarative/qml/qmlcompiler_p.h
+++ b/src/declarative/qml/qmlcompiler_p.h
@@ -191,6 +191,7 @@ private:
                               const BindingContext &ctxt);
     bool buildValueTypeProperty(QObject *type, 
                                 QmlParser::Object *obj, 
+                                QmlParser::Object *baseObj,
                                 const BindingContext &ctxt);
     bool buildListProperty(QmlParser::Property *prop,
                            QmlParser::Object *obj,
@@ -209,7 +210,7 @@ private:
     bool doesPropertyExist(QmlParser::Property *prop, QmlParser::Object *obj);
     bool testLiteralAssignment(const QMetaProperty &prop, 
                                QmlParser::Value *value);
-    enum DynamicMetaMode { IgnoreAliases, ResolveAliases };
+    enum DynamicMetaMode { IgnoreAliases, ResolveAliases, ForceCreation };
     bool mergeDynamicMetaProperties(QmlParser::Object *obj);
     bool buildDynamicMeta(QmlParser::Object *obj, DynamicMetaMode mode);
     bool checkDynamicMeta(QmlParser::Object *obj);
diff --git a/src/declarative/qml/qmlcomponent.cpp b/src/declarative/qml/qmlcomponent.cpp
index 5b1cbeb..9a761b2 100644
--- a/src/declarative/qml/qmlcomponent.cpp
+++ b/src/declarative/qml/qmlcomponent.cpp
@@ -573,7 +573,7 @@ void QmlComponentPrivate::completeCreate()
                     bindValues.at(ii);
                 for (int jj = 0; jj < bv.count; ++jj) {
                     if(bv.at(jj)) 
-                        bv.at(jj)->setEnabled(true);
+                        bv.at(jj)->setEnabled(true, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
                 }
                 QmlEnginePrivate::clear(bv);
             }
diff --git a/src/declarative/qml/qmlinstruction.cpp b/src/declarative/qml/qmlinstruction.cpp
index 18439f4..a465445 100644
--- a/src/declarative/qml/qmlinstruction.cpp
+++ b/src/declarative/qml/qmlinstruction.cpp
@@ -149,6 +149,9 @@ void QmlCompiledData::dump(QmlInstruction *instr, int idx)
     case QmlInstruction::StoreValueSource:
         qWarning() << idx << "\t" << line << "\t" << "STORE_VALUE_SOURCE\t" << instr->assignValueSource.property << "\t" << instr->assignValueSource.castValue;
         break;
+    case QmlInstruction::StoreValueInterceptor:
+        qWarning() << idx << "\t" << line << "\t" << "STORE_VALUE_INTERCEPTOR\t" << instr->assignValueInterceptor.property << "\t" << instr->assignValueInterceptor.castValue;
+        break;
     case QmlInstruction::BeginObject:
         qWarning() << idx << "\t" << line << "\t" << "BEGIN\t\t\t" << instr->begin.castValue;
         break;
diff --git a/src/declarative/qml/qmlinstruction_p.h b/src/declarative/qml/qmlinstruction_p.h
index 0da40c3..5265d42 100644
--- a/src/declarative/qml/qmlinstruction_p.h
+++ b/src/declarative/qml/qmlinstruction_p.h
@@ -130,6 +130,7 @@ public:
         StoreIdOptBinding,        /* assignIdOptBinding */
         StoreObjPropBinding,      /* assignObjPropBinding */
         StoreValueSource,         /* assignValueSource */
+        StoreValueInterceptor,    /* assignValueInterceptor */
 
         BeginObject,              /* begin */
 
@@ -190,6 +191,11 @@ public:
         } assignValueSource;
         struct {
             int property;
+            int owner;
+            int castValue;
+        } assignValueInterceptor;   //### merge with above
+        struct {
+            int property;
             int value;
             short context;
             short owner;
diff --git a/src/declarative/qml/qmlmetaproperty.cpp b/src/declarative/qml/qmlmetaproperty.cpp
index a43f6c3..8643301 100644
--- a/src/declarative/qml/qmlmetaproperty.cpp
+++ b/src/declarative/qml/qmlmetaproperty.cpp
@@ -559,17 +559,17 @@ QmlAbstractBinding *QmlMetaProperty::binding() const
     is assumed by the caller.
 */
 QmlAbstractBinding *
-QmlMetaProperty::setBinding(QmlAbstractBinding *newBinding) const
+QmlMetaProperty::setBinding(QmlAbstractBinding *newBinding, QmlMetaProperty::WriteFlags flags) const
 {
     if (!isProperty() || (type() & Attached) || !d->object)
         return 0;
 
-    return d->setBinding(d->object, d->core, newBinding);
+    return d->setBinding(d->object, d->core, newBinding, flags);
 }
 
 QmlAbstractBinding *
 QmlMetaPropertyPrivate::setBinding(QObject *object, const QmlPropertyCache::Data &core, 
-                                   QmlAbstractBinding *newBinding)
+                                   QmlAbstractBinding *newBinding, QmlMetaProperty::WriteFlags flags)
 {
     QmlDeclarativeData *data = QmlDeclarativeData::get(object, 0 != newBinding);
 
@@ -581,7 +581,7 @@ QmlMetaPropertyPrivate::setBinding(QObject *object, const QmlPropertyCache::Data
                 binding->setEnabled(false);
 
                 if (newBinding) 
-                    newBinding->setEnabled(true);
+                    newBinding->setEnabled(true, flags);
 
                 return binding; // ### QmlAbstractBinding;
             }
@@ -591,7 +591,7 @@ QmlMetaPropertyPrivate::setBinding(QObject *object, const QmlPropertyCache::Data
     } 
 
     if (newBinding)
-        newBinding->setEnabled(true);
+        newBinding->setEnabled(true, flags);
 
     return 0;
 }
@@ -728,11 +728,52 @@ QVariant QmlMetaPropertyPrivate::readValueProperty()
     }
 }
 
+//###
+//writeEnumProperty MIRRORS the relelvant bit of QMetaProperty::write AND MUST BE KEPT IN SYNC!
+//###
+bool QmlMetaPropertyPrivate::writeEnumProperty(const QMetaProperty &prop, int idx, QObject *object, const QVariant &value, int flags)
+{
+    if (!object || !prop.isWritable())
+        return false;
+
+    QVariant v = value;
+    uint t = QVariant::Invalid;
+    if (prop.isEnumType()) {
+        QMetaEnum menum = prop.enumerator();
+        if (v.type() == QVariant::String
+#ifdef QT3_SUPPORT
+            || v.type() == QVariant::CString
+#endif
+            ) {
+            if (prop.isFlagType())
+                v = QVariant(menum.keysToValue(value.toByteArray()));
+            else
+                v = QVariant(menum.keyToValue(value.toByteArray()));
+        } else if (v.type() != QVariant::Int && v.type() != QVariant::UInt) {
+            int enumMetaTypeId = QMetaType::type(QByteArray(menum.scope()) + "::" + menum.name());
+            if ((enumMetaTypeId == 0) || (v.userType() != enumMetaTypeId) || !v.constData())
+                return false;
+            v = QVariant(*reinterpret_cast<const int *>(v.constData()));
+        }
+        v.convert(QVariant::Int);
+    }
+
+    // the status variable is changed by qt_metacall to indicate what it did
+    // this feature is currently only used by QtDBus and should not be depended
+    // upon. Don't change it without looking into QDBusAbstractInterface first
+    // -1 (unchanged): normal qt_metacall, result stored in argv[0]
+    // changed: result stored directly in value, return the value of status
+    int status = -1;
+    void *argv[] = { v.data(), &v, &status, &flags };
+    QMetaObject::metacall(object, QMetaObject::WriteProperty, idx, argv);
+    return status;
+}
+
 void QmlMetaPropertyPrivate::writeValueProperty(const QVariant &value,
-                                                QmlMetaProperty::WriteSource source)
+                                                QmlMetaProperty::WriteFlags flags)
 {
     // Remove any existing bindings on this property
-    if (source != QmlMetaProperty::Binding) 
+    if (!(flags & QmlMetaProperty::DontRemoveBinding))
         delete q->setBinding(0);
 
     uint type = q->type();
@@ -752,22 +793,23 @@ void QmlMetaPropertyPrivate::writeValueProperty(const QVariant &value,
         QmlPropertyCache::Data data = core;
         data.coreIndex = valueTypeCoreIdx;
         data.propType = valueTypePropType;
-        write(writeBack, data, value, context);
+        write(writeBack, data, value, context, flags);
 
-        writeBack->write(object, core.coreIndex);
+        writeBack->write(object, core.coreIndex, flags);
         if (!ep) delete writeBack;
 
     } else {
 
-        write(object, core, value, context);
+        write(object, core, value, context, flags);
 
     }
 }
 
 void QmlMetaPropertyPrivate::write(QObject *object, const QmlPropertyCache::Data &property, 
-                                   const QVariant &value, QmlContext *context)
+                                   const QVariant &value, QmlContext *context, QmlMetaProperty::WriteFlags flags)
 {
     int coreIdx = property.coreIndex;
+    int status = -1;    //for dbus
 
     if (property.flags & QmlPropertyCache::Data::IsEnumType) {
         QMetaProperty prop = object->metaObject()->property(property.coreIndex);
@@ -779,7 +821,7 @@ void QmlMetaPropertyPrivate::write(QObject *object, const QmlPropertyCache::Data
             if (qFuzzyCompare(fractional, (double)0.0))
                 v.convert(QVariant::Int);
         }
-        prop.write(object, v);
+        writeEnumProperty(prop, coreIdx, object, v, flags);
 
         return;
     }
@@ -812,14 +854,12 @@ void QmlMetaPropertyPrivate::write(QObject *object, const QmlPropertyCache::Data
 
     } else if (vt == t) {
 
-        void *a[1];
-        a[0] = (void *)value.constData();
+        void *a[] = { (void *)value.constData(), 0, &status, &flags };
         QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, a);
 
     } else if (qMetaTypeId<QVariant>() == t) {
 
-        void *a[1];
-        a[0] = (void *)&value;
+        void *a[] = { (void *)&value, 0, &status, &flags };
         QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, a);
 
     } else if (property.flags & QmlPropertyCache::Data::IsQObjectDerived) {
@@ -843,7 +883,7 @@ void QmlMetaPropertyPrivate::write(QObject *object, const QmlPropertyCache::Data
 
         if (valMo || !o) {
 
-            void *args[] = { &o, 0 };
+            void *args[] = { &o, 0, &status, &flags };
             QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, 
                                   args);
 
@@ -909,16 +949,14 @@ void QmlMetaPropertyPrivate::write(QObject *object, const QmlPropertyCache::Data
 
         QVariant v = value;
         if (v.convert((QVariant::Type)t)) {
-            void *a[1];
-            a[0] = (void *)v.constData();
+            void *a[] = { (void *)v.constData(), 0, &status, &flags};
             QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, a);
         } else if ((uint)t >= QVariant::UserType && vt == QVariant::String) {
             QmlMetaType::StringConverter con = QmlMetaType::customStringConverter(t);
             if (con) {
                 QVariant v = con(value.toString());
                 if (v.userType() == t) {
-                    void *a[1];
-                    a[0] = (void *)v.constData();
+                    void *a[] = { (void *)v.constData(), 0, &status, &flags};
                     QMetaObject::metacall(object, QMetaObject::WriteProperty, coreIdx, a);
                 }
             }
@@ -931,17 +969,17 @@ void QmlMetaPropertyPrivate::write(QObject *object, const QmlPropertyCache::Data
 */
 void QmlMetaProperty::write(const QVariant &value) const
 {
-    write(value, Other);
+    write(value, 0);
 }
 
-void QmlMetaProperty::write(const QVariant &value, WriteSource source) const
+void QmlMetaProperty::write(const QVariant &value, QmlMetaProperty::WriteFlags flags) const
 {
     if (!d->object)
         return;
 
     if (type() & Property && d->core.isValid()) {
 
-        d->writeValueProperty(value, source);
+        d->writeValueProperty(value, flags);
 
     }
 }
diff --git a/src/declarative/qml/qmlmetaproperty.h b/src/declarative/qml/qmlmetaproperty.h
index 8c34ece..b0ae28c 100644
--- a/src/declarative/qml/qmlmetaproperty.h
+++ b/src/declarative/qml/qmlmetaproperty.h
@@ -88,8 +88,9 @@ public:
 
     QVariant read() const;
     void write(const QVariant &) const;
-    enum WriteSource { Animation, Binding, Other };
-    void write(const QVariant &, WriteSource) const;
+    enum WriteFlag { BypassInterceptor = 0x01, DontRemoveBinding = 0x02 };
+    Q_DECLARE_FLAGS(WriteFlags, WriteFlag)
+    void write(const QVariant &, QmlMetaProperty::WriteFlags) const;
 
     bool hasChangedNotifier() const;
     bool needsChangedNotifier() const;
@@ -126,7 +127,8 @@ public:
     QMetaProperty property() const;
 
     QmlAbstractBinding *binding() const;
-    QmlAbstractBinding *setBinding(QmlAbstractBinding *) const;
+    QmlAbstractBinding *setBinding(QmlAbstractBinding *,
+                                   QmlMetaProperty::WriteFlags flags = QmlMetaProperty::DontRemoveBinding) const;
 
     QmlExpression *signalExpression() const;
     QmlExpression *setSignalExpression(QmlExpression *) const;
@@ -139,6 +141,7 @@ private:
     QmlMetaPropertyPrivate *d;
 };
 typedef QList<QmlMetaProperty> QmlMetaProperties;
+ Q_DECLARE_OPERATORS_FOR_FLAGS(QmlMetaProperty::WriteFlags)
 
 QT_END_NAMESPACE
 
diff --git a/src/declarative/qml/qmlmetaproperty_p.h b/src/declarative/qml/qmlmetaproperty_p.h
index 4576b71..b74aa2d 100644
--- a/src/declarative/qml/qmlmetaproperty_p.h
+++ b/src/declarative/qml/qmlmetaproperty_p.h
@@ -97,9 +97,12 @@ public:
     QmlMetaProperty::PropertyCategory propertyCategory() const;
 
     QVariant readValueProperty();
-    void writeValueProperty(const QVariant &, QmlMetaProperty::WriteSource);
-    static void write(QObject *, const QmlPropertyCache::Data &, const QVariant &, QmlContext *);
-    static QmlAbstractBinding *setBinding(QObject *, const QmlPropertyCache::Data &, QmlAbstractBinding *);
+    void writeValueProperty(const QVariant &, QmlMetaProperty::WriteFlags);
+    static bool writeEnumProperty(const QMetaProperty &prop, int idx, QObject *object, const QVariant &value, int flags);
+    static void write(QObject *, const QmlPropertyCache::Data &, const QVariant &, QmlContext *,
+                      QmlMetaProperty::WriteFlags flags = 0);
+    static QmlAbstractBinding *setBinding(QObject *, const QmlPropertyCache::Data &, QmlAbstractBinding *,
+                                          QmlMetaProperty::WriteFlags flags = QmlMetaProperty::DontRemoveBinding);
 
     static quint32 saveValueType(int, int);
     static quint32 saveProperty(int);
diff --git a/src/declarative/qml/qmlmetatype.cpp b/src/declarative/qml/qmlmetatype.cpp
index c40232f..5198f9f 100644
--- a/src/declarative/qml/qmlmetatype.cpp
+++ b/src/declarative/qml/qmlmetatype.cpp
@@ -128,6 +128,7 @@ public:
     const QMetaObject *m_attachedPropertiesType;
     int m_parserStatusCast;
     int m_propertyValueSourceCast;
+    int m_propertyValueInterceptorCast;
     QmlPrivate::CreateFunc m_extFunc;
     const QMetaObject *m_extMetaObject;
     int m_index;
@@ -140,8 +141,8 @@ public:
 QmlTypePrivate::QmlTypePrivate()
 : m_isInterface(false), m_iid(0), m_typeId(0), m_listId(0), m_qmlListId(0),
   m_opFunc(0), m_baseMetaObject(0), m_attachedPropertiesFunc(0), m_attachedPropertiesType(0),
-  m_parserStatusCast(-1), m_propertyValueSourceCast(-1), m_extFunc(0), m_extMetaObject(0),
-  m_index(-1), m_customParser(0), m_isSetup(false)
+  m_parserStatusCast(-1), m_propertyValueSourceCast(-1), m_propertyValueInterceptorCast(-1),
+  m_extFunc(0), m_extMetaObject(0), m_index(-1), m_customParser(0), m_isSetup(false)
 {
 }
 
@@ -169,7 +170,8 @@ QmlType::QmlType(int type, int listType, int qmlListType,
                  const QMetaObject *metaObject,
                  QmlAttachedPropertiesFunc attachedPropertiesFunc,
                  const QMetaObject *attachedType,
-                 int parserStatusCast, int propertyValueSourceCast, QmlPrivate::CreateFunc extFunc,
+                 int parserStatusCast, int propertyValueSourceCast, int propertyValueInterceptorCast,
+                 QmlPrivate::CreateFunc extFunc,
                  const QMetaObject *extMetaObject, int index,
                  QmlCustomParser *customParser)
 : d(new QmlTypePrivate)
@@ -187,6 +189,7 @@ QmlType::QmlType(int type, int listType, int qmlListType,
     d->m_attachedPropertiesType = attachedType;
     d->m_parserStatusCast = parserStatusCast;
     d->m_propertyValueSourceCast = propertyValueSourceCast;
+    d->m_propertyValueInterceptorCast = propertyValueInterceptorCast;
     d->m_extFunc = extFunc;
     d->m_index = index;
     d->m_customParser = customParser;
@@ -412,6 +415,11 @@ int QmlType::propertyValueSourceCast() const
     return d->m_propertyValueSourceCast;
 }
 
+int QmlType::propertyValueInterceptorCast() const
+{
+    return d->m_propertyValueInterceptorCast;
+}
+
 QVariant QmlType::fromObject(QObject *obj) const
 {
     QVariant rv;
@@ -467,7 +475,7 @@ int QmlMetaType::registerInterface(const QmlPrivate::MetaTypeIds &id,
 int QmlMetaType::registerType(const QmlPrivate::MetaTypeIds &id, QmlPrivate::Func func,
         const char *uri, int version_maj, int version_min_from, int version_min_to, const char *cname,
         const QMetaObject *mo, QmlAttachedPropertiesFunc attach, const QMetaObject *attachMo,
-        int pStatus, int object, int valueSource, QmlPrivate::CreateFunc extFunc, const QMetaObject *extmo, QmlCustomParser *parser)
+        int pStatus, int object, int valueSource, int valueInterceptor, QmlPrivate::CreateFunc extFunc, const QMetaObject *extmo, QmlCustomParser *parser)
 {
     Q_UNUSED(object);
 
@@ -492,7 +500,7 @@ int QmlMetaType::registerType(const QmlPrivate::MetaTypeIds &id, QmlPrivate::Fun
 
     QmlType *type = new QmlType(id.typeId, id.listId, id.qmlListId,
                                 func, name, version_maj, version_min_from, version_min_to, mo, attach, attachMo, pStatus,
-                                valueSource, extFunc, extmo, index, parser);
+                                valueSource, valueInterceptor, extFunc, extmo, index, parser);
 
     data->types.append(type);
     data->idToType.insert(type->typeId(), type);
@@ -539,6 +547,17 @@ int QmlMetaType::qmlPropertyValueSourceCast(int userType)
         return -1;
 }
 
+int QmlMetaType::qmlPropertyValueInterceptorCast(int userType)
+{
+    QReadLocker lock(metaTypeDataLock());
+    QmlMetaTypeData *data = metaTypeData();
+    QmlType *type = data->idToType.value(userType);
+    if (type && type->typeId() == userType)
+        return type->propertyValueInterceptorCast();
+    else
+        return -1;
+}
+
 QObject *QmlMetaType::toQObject(const QVariant &v)
 {
     if (!isObject(v.userType()))
diff --git a/src/declarative/qml/qmlmetatype.h b/src/declarative/qml/qmlmetatype.h
index 02c817d..42c278c 100644
--- a/src/declarative/qml/qmlmetatype.h
+++ b/src/declarative/qml/qmlmetatype.h
@@ -48,6 +48,7 @@
 #include <QtDeclarative/qmlprivate.h>
 #include <QtDeclarative/qmlparserstatus.h>
 #include <QtDeclarative/qmlpropertyvaluesource.h>
+#include <QtDeclarative/qmlpropertyvalueinterceptor.h>
 
 QT_BEGIN_HEADER
 
@@ -60,7 +61,7 @@ class QmlCustomParser;
 class Q_DECLARATIVE_EXPORT QmlMetaType
 {
 public:
-    static int registerType(const QmlPrivate::MetaTypeIds &, QmlPrivate::Func, const char *, int vmaj, int vmin_from, int vmin_to, const char *qmlName, const QMetaObject *, QmlAttachedPropertiesFunc, const QMetaObject *, int pStatus, int object, int valueSource, QmlPrivate::CreateFunc extFunc, const QMetaObject *extmo, QmlCustomParser *);
+    static int registerType(const QmlPrivate::MetaTypeIds &, QmlPrivate::Func, const char *, int vmaj, int vmin_from, int vmin_to, const char *qmlName, const QMetaObject *, QmlAttachedPropertiesFunc, const QMetaObject *, int pStatus, int object, int valueSource, int valueInterceptor, QmlPrivate::CreateFunc extFunc, const QMetaObject *extmo, QmlCustomParser *);
     static int registerInterface(const QmlPrivate::MetaTypeIds &, QmlPrivate::Func, const char *);
 
     static bool copy(int type, void *data, const void *copy = 0);
@@ -80,6 +81,7 @@ public:
     static QObject *toQObject(const QVariant &);
     static int qmlParserStatusCast(int);
     static int qmlPropertyValueSourceCast(int);
+    static int qmlPropertyValueInterceptorCast(int);
     static int listType(int);
     static bool clear(const QVariant &);
     static bool append(const QVariant &, const QVariant &);
@@ -146,6 +148,7 @@ public:
     QVariant fromObject(QObject *) const;
     const char *interfaceIId() const;
     int propertyValueSourceCast() const;
+    int propertyValueInterceptorCast() const;
 
     int index() const;
 private:
@@ -153,7 +156,7 @@ private:
     friend class QmlTypePrivate;
     friend class QmlMetaTypeData;
     QmlType(int, int, int, QmlPrivate::Func, const char *, int);
-    QmlType(int, int, int, QmlPrivate::Func, const char *, int, int, int, const QMetaObject *, QmlAttachedPropertiesFunc, const QMetaObject *, int, int, QmlPrivate::CreateFunc, const QMetaObject *, int, QmlCustomParser *);
+    QmlType(int, int, int, QmlPrivate::Func, const char *, int, int, int, const QMetaObject *, QmlAttachedPropertiesFunc, const QMetaObject *, int, int, int, QmlPrivate::CreateFunc, const QMetaObject *, int, QmlCustomParser *);
     ~QmlType();
 
     QmlTypePrivate *d;
@@ -176,6 +179,7 @@ int qmlRegisterType(const char *typeName)
             QmlPrivate::StaticCastSelector<T,QmlParserStatus>::cast(), 
             QmlPrivate::StaticCastSelector<T,QObject>::cast(),
             QmlPrivate::StaticCastSelector<T,QmlPropertyValueSource>::cast(),
+            QmlPrivate::StaticCastSelector<T,QmlPropertyValueInterceptor>::cast(),
             0, 0, 0);
 }
 
@@ -196,7 +200,8 @@ int qmlRegisterType(const char *uri, int version_maj, int version_min_from, int
             QmlPrivate::attachedPropertiesMetaObject<T>(),
             QmlPrivate::StaticCastSelector<T,QmlParserStatus>::cast(), 
             QmlPrivate::StaticCastSelector<T,QObject>::cast(), 
-            QmlPrivate::StaticCastSelector<T,QmlPropertyValueSource>::cast(), 
+            QmlPrivate::StaticCastSelector<T,QmlPropertyValueSource>::cast(),
+            QmlPrivate::StaticCastSelector<T,QmlPropertyValueInterceptor>::cast(),
             0, 0, 0);
 }
 
@@ -224,6 +229,7 @@ int qmlRegisterExtendedType(const char *typeName)
             QmlPrivate::StaticCastSelector<T,QmlParserStatus>::cast(), 
             QmlPrivate::StaticCastSelector<T,QObject>::cast(),
             QmlPrivate::StaticCastSelector<T,QmlPropertyValueSource>::cast(),
+            QmlPrivate::StaticCastSelector<T,QmlPropertyValueInterceptor>::cast(),
             &QmlPrivate::CreateParent<E>::create, &E::staticMetaObject, 0);
 }
 
@@ -253,6 +259,7 @@ int qmlRegisterExtendedType(const char *uri, int version_maj, int version_min_fr
             QmlPrivate::StaticCastSelector<T,QmlParserStatus>::cast(), 
             QmlPrivate::StaticCastSelector<T,QObject>::cast(),
             QmlPrivate::StaticCastSelector<T,QmlPropertyValueSource>::cast(),
+            QmlPrivate::StaticCastSelector<T,QmlPropertyValueInterceptor>::cast(),
             &QmlPrivate::CreateParent<E>::create, 
             &E::staticMetaObject, 0);
 }
@@ -290,6 +297,7 @@ int qmlRegisterCustomType(const char *uri, int version_maj, int version_min_from
             QmlPrivate::StaticCastSelector<T,QmlParserStatus>::cast(), 
             QmlPrivate::StaticCastSelector<T,QObject>::cast(),
             QmlPrivate::StaticCastSelector<T,QmlPropertyValueSource>::cast(),
+            QmlPrivate::StaticCastSelector<T,QmlPropertyValueInterceptor>::cast(),
             0, 0, parser);
 }
 
diff --git a/src/declarative/qml/qmlparser.cpp b/src/declarative/qml/qmlparser.cpp
index 8c46939..bae263a 100644
--- a/src/declarative/qml/qmlparser.cpp
+++ b/src/declarative/qml/qmlparser.cpp
@@ -282,6 +282,9 @@ void QmlParser::Value::dump(int indent) const
     case Value::ValueSource:
         type = "ValueSource";
         break;
+    case Value::ValueInterceptor:
+        type = "ValueInterceptor";
+        break;
     case Value::CreatedObject:
         type = "CreatedObject";
         break;
diff --git a/src/declarative/qml/qmlparser_p.h b/src/declarative/qml/qmlparser_p.h
index d05cc73..88d7d77 100644
--- a/src/declarative/qml/qmlparser_p.h
+++ b/src/declarative/qml/qmlparser_p.h
@@ -275,6 +275,8 @@ namespace QmlParser
             PropertyBinding,
             // This is used as a QmlPropertyValueSource assignment
             ValueSource,
+            // This is used as a QmlPropertyValueInterceptor assignment
+            ValueInterceptor,
             // This is used as a property QObject assignment
             CreatedObject,
             // This is used as a signal object assignment
diff --git a/src/declarative/qml/qmlpropertyvalueinterceptor.cpp b/src/declarative/qml/qmlpropertyvalueinterceptor.cpp
new file mode 100644
index 0000000..86905e6
--- /dev/null
+++ b/src/declarative/qml/qmlpropertyvalueinterceptor.cpp
@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** 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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmlpropertyvalueinterceptor.h"
+#include "qml.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QmlPropertyValueInterceptor
+    \brief The QmlPropertyValueInterceptor class is inherited by property interceptors such as Behavior.
+
+    This class intercepts property writes, allowing for custom handling. For example, Behavior uses this
+    interception to provide a default animation for all changes to a property's value.
+ */
+
+/*!
+    Constructs a QmlPropertyValueInterceptor.
+*/
+QmlPropertyValueInterceptor::QmlPropertyValueInterceptor()
+{
+}
+
+QmlPropertyValueInterceptor::~QmlPropertyValueInterceptor()
+{
+}
+
+/*!
+    \fn void QmlPropertyValueInterceptor::setTarget(const QmlMetaProperty &property)
+    Set the target \a property for the value interceptor.  This method will
+    be called by the QML engine when assigning a value interceptor.
+*/
+
+/*!
+    \fn void QmlPropertyValueInterceptor::write(const QVariant &value)
+    This method will be called when a new \a value is assigned to the property being intercepted.
+*/
+
+QT_END_NAMESPACE
diff --git a/src/declarative/qml/qmlpropertyvalueinterceptor.h b/src/declarative/qml/qmlpropertyvalueinterceptor.h
new file mode 100644
index 0000000..678c12c
--- /dev/null
+++ b/src/declarative/qml/qmlpropertyvalueinterceptor.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** 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 QMLPROPERTYVALUEINTERCEPTOR_H
+#define QMLPROPERTYVALUEINTERCEPTOR_H
+
+#include <QtCore/qobject.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Declarative)
+
+class QmlMetaProperty;
+class Q_DECLARATIVE_EXPORT QmlPropertyValueInterceptor
+{
+public:
+    QmlPropertyValueInterceptor();
+    virtual ~QmlPropertyValueInterceptor();
+    virtual void setTarget(const QmlMetaProperty &property) = 0;
+    virtual void write(const QVariant &value) = 0;
+};
+Q_DECLARE_INTERFACE(QmlPropertyValueInterceptor, "com.trolltech.qml.QmlPropertyValueInterceptor")
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QMLPROPERTYVALUEINTERCEPTOR_H
diff --git a/src/declarative/qml/qmlvaluetype.cpp b/src/declarative/qml/qmlvaluetype.cpp
index 4ae2070..84c9ecb 100644
--- a/src/declarative/qml/qmlvaluetype.cpp
+++ b/src/declarative/qml/qmlvaluetype.cpp
@@ -97,9 +97,10 @@ void QmlPointFValueType::read(QObject *obj, int idx)
     QMetaObject::metacall(obj, QMetaObject::ReadProperty, idx, a);
 }
 
-void QmlPointFValueType::write(QObject *obj, int idx)
+void QmlPointFValueType::write(QObject *obj, int idx, QmlMetaProperty::WriteFlags flags)
 {
-    void *a[] = { &point, 0 };
+    int status = -1;
+    void *a[] = { &point, 0, &status, &flags };
     QMetaObject::metacall(obj, QMetaObject::WriteProperty, idx, a);
 }
 
@@ -144,9 +145,10 @@ void QmlPointValueType::read(QObject *obj, int idx)
     QMetaObject::metacall(obj, QMetaObject::ReadProperty, idx, a);
 }
 
-void QmlPointValueType::write(QObject *obj, int idx)
+void QmlPointValueType::write(QObject *obj, int idx, QmlMetaProperty::WriteFlags flags)
 {
-    void *a[] = { &point, 0 };
+    int status = -1;
+    void *a[] = { &point, 0, &status, &flags };
     QMetaObject::metacall(obj, QMetaObject::WriteProperty, idx, a);
 }
 
@@ -191,9 +193,10 @@ void QmlSizeFValueType::read(QObject *obj, int idx)
     QMetaObject::metacall(obj, QMetaObject::ReadProperty, idx, a);
 }
 
-void QmlSizeFValueType::write(QObject *obj, int idx)
+void QmlSizeFValueType::write(QObject *obj, int idx, QmlMetaProperty::WriteFlags flags)
 {
-    void *a[] = { &size, 0 };
+    int status = -1;
+    void *a[] = { &size, 0, &status, &flags };
     QMetaObject::metacall(obj, QMetaObject::WriteProperty, idx, a);
 }
 
@@ -238,9 +241,10 @@ void QmlSizeValueType::read(QObject *obj, int idx)
     QMetaObject::metacall(obj, QMetaObject::ReadProperty, idx, a);
 }
 
-void QmlSizeValueType::write(QObject *obj, int idx)
+void QmlSizeValueType::write(QObject *obj, int idx, QmlMetaProperty::WriteFlags flags)
 {
-    void *a[] = { &size, 0 };
+    int status = -1;
+    void *a[] = { &size, 0, &status, &flags };
     QMetaObject::metacall(obj, QMetaObject::WriteProperty, idx, a);
 }
 
@@ -285,9 +289,10 @@ void QmlRectFValueType::read(QObject *obj, int idx)
     QMetaObject::metacall(obj, QMetaObject::ReadProperty, idx, a);
 }
 
-void QmlRectFValueType::write(QObject *obj, int idx)
+void QmlRectFValueType::write(QObject *obj, int idx, QmlMetaProperty::WriteFlags flags)
 {
-    void *a[] = { &rect, 0 };
+    int status = -1;
+    void *a[] = { &rect, 0, &status, &flags };
     QMetaObject::metacall(obj, QMetaObject::WriteProperty, idx, a);
 }
 
@@ -352,9 +357,10 @@ void QmlRectValueType::read(QObject *obj, int idx)
     QMetaObject::metacall(obj, QMetaObject::ReadProperty, idx, a);
 }
 
-void QmlRectValueType::write(QObject *obj, int idx)
+void QmlRectValueType::write(QObject *obj, int idx, QmlMetaProperty::WriteFlags flags)
 {
-    void *a[] = { &rect, 0 };
+    int status = -1;
+    void *a[] = { &rect, 0, &status, &flags };
     QMetaObject::metacall(obj, QMetaObject::WriteProperty, idx, a);
 }
 
@@ -419,9 +425,10 @@ void QmlVector3DValueType::read(QObject *obj, int idx)
     QMetaObject::metacall(obj, QMetaObject::ReadProperty, idx, a);
 }
 
-void QmlVector3DValueType::write(QObject *obj, int idx)
+void QmlVector3DValueType::write(QObject *obj, int idx, QmlMetaProperty::WriteFlags flags)
 {
-    void *a[] = { &vector, 0 };
+    int status = -1;
+    void *a[] = { &vector, 0, &status, &flags };
     QMetaObject::metacall(obj, QMetaObject::WriteProperty, idx, a);
 }
 
@@ -476,9 +483,10 @@ void QmlFontValueType::read(QObject *obj, int idx)
     QMetaObject::metacall(obj, QMetaObject::ReadProperty, idx, a);
 }
 
-void QmlFontValueType::write(QObject *obj, int idx)
+void QmlFontValueType::write(QObject *obj, int idx, QmlMetaProperty::WriteFlags flags)
 {
-    void *a[] = { &font, 0 };
+    int status = -1;
+    void *a[] = { &font, 0, &status, &flags };
     QMetaObject::metacall(obj, QMetaObject::WriteProperty, idx, a);
 }
 
diff --git a/src/declarative/qml/qmlvaluetype_p.h b/src/declarative/qml/qmlvaluetype_p.h
index da5e972..d3adf1e 100644
--- a/src/declarative/qml/qmlvaluetype_p.h
+++ b/src/declarative/qml/qmlvaluetype_p.h
@@ -58,6 +58,7 @@
 #include <QtCore/qvariant.h>
 #include <QtGui/qvector3d.h>
 #include <QtGui/qfont.h>
+#include <QmlMetaProperty>
 
 QT_BEGIN_NAMESPACE
 
@@ -67,7 +68,7 @@ class QmlValueType : public QObject
 public:
     QmlValueType(QObject *parent = 0);
     virtual void read(QObject *, int) = 0;
-    virtual void write(QObject *, int) = 0;
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags flags) = 0;
     virtual QVariant value() = 0;
     virtual void setValue(QVariant) = 0;
 };
@@ -92,7 +93,7 @@ public:
     QmlPointFValueType(QObject *parent = 0);
 
     virtual void read(QObject *, int);
-    virtual void write(QObject *, int);
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags);
     virtual QVariant value();
     virtual void setValue(QVariant value);
 
@@ -114,7 +115,7 @@ public:
     QmlPointValueType(QObject *parent = 0);
 
     virtual void read(QObject *, int);
-    virtual void write(QObject *, int);
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags);
     virtual QVariant value();
     virtual void setValue(QVariant value);
 
@@ -136,7 +137,7 @@ public:
     QmlSizeFValueType(QObject *parent = 0);
 
     virtual void read(QObject *, int);
-    virtual void write(QObject *, int);
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags);
     virtual QVariant value();
     virtual void setValue(QVariant value);
 
@@ -158,7 +159,7 @@ public:
     QmlSizeValueType(QObject *parent = 0);
 
     virtual void read(QObject *, int);
-    virtual void write(QObject *, int);
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags);
     virtual QVariant value();
     virtual void setValue(QVariant value);
 
@@ -182,7 +183,7 @@ public:
     QmlRectFValueType(QObject *parent = 0);
 
     virtual void read(QObject *, int);
-    virtual void write(QObject *, int);
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags);
     virtual QVariant value();
     virtual void setValue(QVariant value);
 
@@ -211,7 +212,7 @@ public:
     QmlRectValueType(QObject *parent = 0);
 
     virtual void read(QObject *, int);
-    virtual void write(QObject *, int);
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags);
     virtual QVariant value();
     virtual void setValue(QVariant value);
 
@@ -239,7 +240,7 @@ public:
     QmlVector3DValueType(QObject *parent = 0);
 
     virtual void read(QObject *, int);
-    virtual void write(QObject *, int);
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags);
     virtual QVariant value();
     virtual void setValue(QVariant value);
 
@@ -267,7 +268,7 @@ public:
     QmlFontValueType(QObject *parent = 0);
 
     virtual void read(QObject *, int);
-    virtual void write(QObject *, int);
+    virtual void write(QObject *, int, QmlMetaProperty::WriteFlags);
     virtual QVariant value();
     virtual void setValue(QVariant value);
 
diff --git a/src/declarative/qml/qmlvaluetypescriptclass.cpp b/src/declarative/qml/qmlvaluetypescriptclass.cpp
index 6fd674a..6a7bdeb 100644
--- a/src/declarative/qml/qmlvaluetypescriptclass.cpp
+++ b/src/declarative/qml/qmlvaluetypescriptclass.cpp
@@ -132,7 +132,7 @@ void QmlValueTypeScriptClass::setProperty(QScriptValue &object,
     ref.type->read(ref.object, ref.property);
     QMetaProperty p = ref.type->metaObject()->property(id);
     p.write(ref.type, v);
-    ref.type->write(ref.object, ref.property);
+    ref.type->write(ref.object, ref.property, 0);
 }
 
 QVariant QmlValueTypeScriptClass::toVariant(const QScriptValue &val)
diff --git a/src/declarative/qml/qmlvme.cpp b/src/declarative/qml/qmlvme.cpp
index a057f11..d4921b6 100644
--- a/src/declarative/qml/qmlvme.cpp
+++ b/src/declarative/qml/qmlvme.cpp
@@ -155,6 +155,9 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
     QmlEnginePrivate *ep = QmlEnginePrivate::get(ctxt->engine());
     QmlContextPrivate *cp = (QmlContextPrivate *)QObjectPrivate::get(ctxt);
 
+    int status = -1;    //for dbus
+    QmlMetaProperty::WriteFlags flags = QmlMetaProperty::BypassInterceptor;
+
     for (int ii = start; !isError() && ii < (start + count); ++ii) {
         QmlInstruction &instr = comp->bytecode[ii];
 
@@ -275,10 +278,9 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreVariant:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 // XXX - can be more efficient
                 QVariant v = QmlStringConverters::variantFromString(primitives.at(instr.storeString.value));
-                a[0] = (void *)&v;
+                void *a[] = { &v, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeString.propertyIndex, a);
             }
@@ -287,8 +289,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreString:
             {
                 QObject *target = stack.top();
-                void *a[1];
-                a[0] = (void *)&primitives.at(instr.storeString.value);
+                void *a[] = { (void *)&primitives.at(instr.storeString.value), 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeString.propertyIndex, a);
             }
@@ -297,9 +298,8 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreUrl:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QUrl u(primitives.at(instr.storeUrl.value));
-                a[0] = (void *)&u;
+                void *a[] = { &u, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeUrl.propertyIndex, a);
             }
@@ -309,8 +309,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
             {
                 QObject *target = stack.top();
                 float f = instr.storeFloat.value;
-                void *a[1];
-                a[0] = &f;
+                void *a[] = { &f, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty,
                                       instr.storeFloat.propertyIndex, a);
             }
@@ -320,8 +319,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
             {
                 QObject *target = stack.top();
                 double d = instr.storeDouble.value;
-                void *a[1];
-                a[0] = &d;
+                void *a[] = { &d, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty,
                                       instr.storeDouble.propertyIndex, a);
             }
@@ -330,8 +328,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreBool:
             {
                 QObject *target = stack.top();
-                void *a[1];
-                a[0] = (void *)&instr.storeBool.value;
+                void *a[] = { (void *)&instr.storeBool.value, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeBool.propertyIndex, a);
             }
@@ -340,8 +337,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreInteger:
             {
                 QObject *target = stack.top();
-                void *a[1];
-                a[0] = (void *)&instr.storeInteger.value;
+                void *a[] = { (void *)&instr.storeInteger.value, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeInteger.propertyIndex, a);
             }
@@ -350,9 +346,8 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreColor:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QColor c = QColor::fromRgba(instr.storeColor.value);
-                a[0] = (void *)&c;
+                void *a[] = { &c, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeColor.propertyIndex, a);
             }
@@ -361,9 +356,8 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreDate:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QDate d = QDate::fromJulianDay(instr.storeDate.value);
-                a[0] = (void *)&d;
+                void *a[] = { &d, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeDate.propertyIndex, a);
             }
@@ -372,13 +366,12 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreTime:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QTime t;
                 t.setHMS(intData.at(instr.storeTime.valueIndex),
                          intData.at(instr.storeTime.valueIndex+1),
                          intData.at(instr.storeTime.valueIndex+2),
                          intData.at(instr.storeTime.valueIndex+3));
-                a[0] = (void *)&t;
+                void *a[] = { &t, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeTime.propertyIndex, a);
             }
@@ -387,14 +380,13 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreDateTime:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QTime t;
                 t.setHMS(intData.at(instr.storeDateTime.valueIndex+1),
                          intData.at(instr.storeDateTime.valueIndex+2),
                          intData.at(instr.storeDateTime.valueIndex+3),
                          intData.at(instr.storeDateTime.valueIndex+4));
                 QDateTime dt(QDate::fromJulianDay(intData.at(instr.storeDateTime.valueIndex)), t);
-                a[0] = (void *)&dt;
+                void *a[] = { &dt, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty,
                                       instr.storeDateTime.propertyIndex, a);
             }
@@ -403,10 +395,9 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StorePoint:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QPoint p = QPointF(floatData.at(instr.storeRealPair.valueIndex),
                                    floatData.at(instr.storeRealPair.valueIndex+1)).toPoint();
-                a[0] = (void *)&p;
+                void *a[] = { &p, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeRealPair.propertyIndex, a);
             }
@@ -415,10 +406,9 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StorePointF:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QPointF p(floatData.at(instr.storeRealPair.valueIndex),
                           floatData.at(instr.storeRealPair.valueIndex+1));
-                a[0] = (void *)&p;
+                void *a[] = { &p, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeRealPair.propertyIndex, a);
             }
@@ -427,10 +417,9 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreSize:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QSize p = QSizeF(floatData.at(instr.storeRealPair.valueIndex),
                                  floatData.at(instr.storeRealPair.valueIndex+1)).toSize();
-                a[0] = (void *)&p;
+                void *a[] = { &p, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeRealPair.propertyIndex, a);
             }
@@ -439,10 +428,9 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreSizeF:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QSizeF s(floatData.at(instr.storeRealPair.valueIndex),
                          floatData.at(instr.storeRealPair.valueIndex+1));
-                a[0] = (void *)&s;
+                void *a[] = { &s, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeRealPair.propertyIndex, a);
             }
@@ -451,12 +439,11 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreRect:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QRect r = QRectF(floatData.at(instr.storeRect.valueIndex),
                                  floatData.at(instr.storeRect.valueIndex+1),
                                  floatData.at(instr.storeRect.valueIndex+2),
                                  floatData.at(instr.storeRect.valueIndex+3)).toRect();
-                a[0] = (void *)&r;
+                void *a[] = { &r, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeRect.propertyIndex, a);
             }
@@ -465,12 +452,11 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreRectF:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QRectF r(floatData.at(instr.storeRect.valueIndex),
                          floatData.at(instr.storeRect.valueIndex+1),
                          floatData.at(instr.storeRect.valueIndex+2),
                          floatData.at(instr.storeRect.valueIndex+3));
-                a[0] = (void *)&r;
+                void *a[] = { &r, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeRect.propertyIndex, a);
             }
@@ -479,11 +465,10 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::StoreVector3D:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QVector3D p(floatData.at(instr.storeVector3D.valueIndex),
                             floatData.at(instr.storeVector3D.valueIndex+1),
                             floatData.at(instr.storeVector3D.valueIndex+2));
-                a[0] = (void *)&p;
+                void *a[] = { &p, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeVector3D.propertyIndex, a);
             }
@@ -494,9 +479,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
                 QObject *assignObj = stack.pop();
                 QObject *target = stack.top();
 
-                void *a[1];
-                a[0] = (void *)&assignObj;
-
+                void *a[] = { (void *)&assignObj, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeObject.propertyIndex, a);
             }
@@ -506,7 +489,6 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
         case QmlInstruction::AssignCustomType:
             {
                 QObject *target = stack.top();
-                void *a[1];
                 QmlCompiledData::CustomTypeData data = customTypeData.at(instr.assignCustomType.valueIndex);
                 const QString &primitive = primitives.at(data.index);
                 QmlMetaType::StringConverter converter = 
@@ -518,7 +500,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
                 if (v.isNull() || ((int)prop.type() != data.type && prop.userType() != data.type)) 
                     VME_EXCEPTION("Cannot assign value" << primitive << "to property" << prop.name());
 
-                a[0] = (void *)v.data();
+                void *a[] = { (void *)v.data(), 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.assignCustomType.propertyIndex, a);
             }
@@ -655,6 +637,20 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
             }
             break;
 
+        case QmlInstruction::StoreValueInterceptor:
+            {
+                QObject *obj = stack.pop();
+                QmlPropertyValueInterceptor *vi = reinterpret_cast<QmlPropertyValueInterceptor *>(reinterpret_cast<char *>(obj) + instr.assignValueInterceptor.castValue);
+                QObject *target = stack.at(stack.count() - 1 - instr.assignValueInterceptor.owner);
+                QmlMetaProperty prop;
+                prop.restore(instr.assignValueInterceptor.property, target, ctxt);
+                obj->setParent(target);
+                vi->setTarget(prop);
+                QmlVMEMetaObject *mo = static_cast<QmlVMEMetaObject *>((QMetaObject*)target->metaObject());
+                mo->registerInterceptor(prop.coreIndex(), vi);
+            }
+            break;
+
         case QmlInstruction::StoreObjectQmlList:
             {
                 QObject *assign = stack.pop();
@@ -706,8 +702,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
                 QObject *target = stack.top();
 
                 QVariant v = QVariant::fromValue(assign);
-                void *a[1];
-                a[0] = (void *)&v;
+                void *a[] = { &v, 0, &status, &flags };
                 QMetaObject::metacall(target, QMetaObject::WriteProperty, 
                                       instr.storeObject.propertyIndex, a);
             }
@@ -726,8 +721,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
                 if (iid) {
                     void *ptr = assign->qt_metacast(iid);
                     if (ptr) {
-                        void *a[1];
-                        a[0] = &ptr;
+                        void *a[] = { &ptr, 0, &status, &flags };
                         QMetaObject::metacall(target, 
                                               QMetaObject::WriteProperty,
                                               coreIdx, a);
@@ -849,7 +843,7 @@ QObject *QmlVME::run(QStack<QObject *> &stack, QmlContext *ctxt,
                 QmlValueType *valueHandler = 
                     static_cast<QmlValueType *>(stack.pop());
                 QObject *target = stack.top();
-                valueHandler->write(target, instr.fetchValue.property);
+                valueHandler->write(target, instr.fetchValue.property, QmlMetaProperty::BypassInterceptor);
             }
             break;
 
diff --git a/src/declarative/qml/qmlvmemetaobject.cpp b/src/declarative/qml/qmlvmemetaobject.cpp
index f473743..5ef1158 100644
--- a/src/declarative/qml/qmlvmemetaobject.cpp
+++ b/src/declarative/qml/qmlvmemetaobject.cpp
@@ -100,6 +100,24 @@ QmlVMEMetaObject::~QmlVMEMetaObject()
 int QmlVMEMetaObject::metaCall(QMetaObject::Call c, int _id, void **a)
 {
     int id = _id;
+    if(c == QMetaObject::WriteProperty) {
+        int flags = *reinterpret_cast<int*>(a[3]);
+        if (!(flags & QmlMetaProperty::BypassInterceptor)
+            && !aInterceptors.isEmpty()
+            && aInterceptors.testBit(id)) {
+            QmlPropertyValueInterceptor *vi = interceptors.value(id);
+            if (id >= propOffset) {
+                id -= propOffset;
+                if (id < metaData->propertyCount) {
+                    vi->write(QVariant(data[id].type(), a[0]));
+                    return -1;
+                }
+            } else {
+                vi->write(QVariant(property(id).type(), a[0]));
+                return -1;
+            }
+        }
+    }
     if(c == QMetaObject::ReadProperty || c == QMetaObject::WriteProperty) {
         if (id >= propOffset) {
             id -= propOffset;
@@ -253,4 +271,13 @@ void QmlVMEMetaObject::listChanged(int id)
     activate(object, methodOffset + id, 0);
 }
 
+void QmlVMEMetaObject::registerInterceptor(int index, QmlPropertyValueInterceptor *interceptor)
+{
+    if (aInterceptors.isEmpty())
+        aInterceptors.resize(propertyCount() + metaData->propertyCount);
+    aInterceptors.setBit(index);
+    interceptors.insert(index, interceptor);
+}
+
+
 QT_END_NAMESPACE
diff --git a/src/declarative/qml/qmlvmemetaobject_p.h b/src/declarative/qml/qmlvmemetaobject_p.h
index 1c26241..d376f4c 100644
--- a/src/declarative/qml/qmlvmemetaobject_p.h
+++ b/src/declarative/qml/qmlvmemetaobject_p.h
@@ -104,6 +104,8 @@ public:
                      QmlRefCount * = 0);
     ~QmlVMEMetaObject();
 
+    void registerInterceptor(int index, QmlPropertyValueInterceptor *interceptor);
+
 protected:
     virtual int metaCall(QMetaObject::Call _c, int _id, void **_a);
 
@@ -117,6 +119,8 @@ private:
 
     QVariant *data;
     QBitArray aConnected;
+    QBitArray aInterceptors;
+    QHash<int, QmlPropertyValueInterceptor*> interceptors;
 
     QAbstractDynamicMetaObject *parent;
 
diff --git a/src/declarative/util/qmlanimation.cpp b/src/declarative/util/qmlanimation.cpp
index 3edbc5f..247e64c 100644
--- a/src/declarative/util/qmlanimation.cpp
+++ b/src/declarative/util/qmlanimation.cpp
@@ -972,7 +972,7 @@ void QmlPropertyAction::setValue(const QVariant &v)
 
 void QmlPropertyActionPrivate::doAction()
 {
-    property.write(value);
+    property.write(value, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
 }
 
 QAbstractAnimation *QmlPropertyAction::qtAnimation()
@@ -1007,9 +1007,7 @@ void QmlPropertyAction::transition(QmlStateActions &actions,
         {
             for (int ii = 0; ii < actions.count(); ++ii) {
                 const Action &action = actions.at(ii);
-                QmlBehavior::_ignore = true;
-                action.property.write(action.toValue);
-                QmlBehavior::_ignore = false;
+                action.property.write(action.toValue, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
             }
         }
     };
@@ -1020,9 +1018,11 @@ void QmlPropertyAction::transition(QmlStateActions &actions,
     if (!d->propertyName.isEmpty() && !props.contains(d->propertyName))
         props.append(d->propertyName);
 
+    bool targetNeedsReset = false;
     if (d->userProperty.isValid() && props.isEmpty() && !target()) {
         props.append(d->userProperty.value.name());
         d->target = d->userProperty.value.object();
+        targetNeedsReset = true;
    }
 
     QmlSetPropertyAnimationAction *data = new QmlSetPropertyAnimationAction;
@@ -1070,6 +1070,8 @@ void QmlPropertyAction::transition(QmlStateActions &actions,
     } else {
         delete data;
     }
+    if (targetNeedsReset)
+        d->target = 0;
 }
 
 QML_DEFINE_TYPE(Qt,4,6,(QT_VERSION&0x00ff00)>>8,PropertyAction,QmlPropertyAction)
@@ -1714,10 +1716,10 @@ void QmlPropertyAnimationPrivate::valueChanged(qreal r)
     }
 
     if (r == 1.) {
-        property.write(to);
+        property.write(to, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
     } else {
         if (interpolator)
-            property.write(interpolator(from.constData(), to.constData(), r));
+            property.write(interpolator(from.constData(), to.constData(), r), QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
     }
 }
 
@@ -1773,9 +1775,8 @@ void QmlPropertyAnimation::transition(QmlStateActions &actions,
             for (int ii = 0; ii < actions.count(); ++ii) {
                 Action &action = actions[ii];
 
-                QmlBehavior::_ignore = true;
                 if (v == 1.)
-                    action.property.write(action.toValue);
+                    action.property.write(action.toValue, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
                 else {
                     if (action.fromValue.isNull()) {
                         action.fromValue = action.property.read();
@@ -1790,9 +1791,8 @@ void QmlPropertyAnimation::transition(QmlStateActions &actions,
                         }
                     }
                     if (interpolator)
-                        action.property.write(interpolator(action.fromValue.constData(), action.toValue.constData(), v));
+                        action.property.write(interpolator(action.fromValue.constData(), action.toValue.constData(), v), QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
                 }
-                QmlBehavior::_ignore = false;
             }
         }
     };
@@ -1805,9 +1805,11 @@ void QmlPropertyAnimation::transition(QmlStateActions &actions,
 
     bool useType = (props.isEmpty() && d->defaultToInterpolatorType) ? true : false;
 
+    bool targetNeedsReset = false;
     if (d->userProperty.isValid() && props.isEmpty() && !target()) {
         props.append(d->userProperty.value.name());
         d->target = d->userProperty.value.object();
+        targetNeedsReset = true;
     }
 
     PropertyUpdater *data = new PropertyUpdater;
@@ -1874,6 +1876,8 @@ void QmlPropertyAnimation::transition(QmlStateActions &actions,
     } else {
         delete data;
     }
+    if (targetNeedsReset)
+        d->target = 0;
 }
 
 QML_DEFINE_TYPE(Qt,4,6,(QT_VERSION&0x00ff00)>>8,PropertyAnimation,QmlPropertyAnimation)
diff --git a/src/declarative/util/qmlpropertychanges.cpp b/src/declarative/util/qmlpropertychanges.cpp
index a5a08bc..b07a79f 100644
--- a/src/declarative/util/qmlpropertychanges.cpp
+++ b/src/declarative/util/qmlpropertychanges.cpp
@@ -230,17 +230,18 @@ void QmlPropertyChangesPrivate::decode()
         ds >> isScript;
         ds >> data;
 
-        if (isScript) {
-            QmlMetaProperty prop = property(name);      //### can we avoid or reuse?
+        QmlMetaProperty prop = property(name);      //### better way to check for signal property?
+        if (prop.type() == QmlMetaProperty::SignalProperty) {
             QmlExpression *expression = new QmlExpression(qmlContext(q), data.toString(), object);
             expression->setTrackChange(false);
-            if (prop.type() == QmlMetaProperty::SignalProperty) {
-                QmlReplaceSignalHandler *handler = new QmlReplaceSignalHandler;
-                handler->property = prop;
-                handler->expression = expression;
-                signalReplacements << handler;
-            } else
-                expressions << qMakePair(name, expression);
+            QmlReplaceSignalHandler *handler = new QmlReplaceSignalHandler;
+            handler->property = prop;
+            handler->expression = expression;
+            signalReplacements << handler;
+        } else if (isScript) {
+            QmlExpression *expression = new QmlExpression(qmlContext(q), data.toString(), object);
+            expression->setTrackChange(false);
+            expressions << qMakePair(name, expression);
         } else {
             properties << qMakePair(name, data);
         }
diff --git a/src/declarative/util/qmlstate.cpp b/src/declarative/util/qmlstate.cpp
index 3c85db7..98facd9 100644
--- a/src/declarative/util/qmlstate.cpp
+++ b/src/declarative/util/qmlstate.cpp
@@ -350,6 +350,7 @@ void QmlState::apply(QmlStateGroup *group, QmlTransition *trans, QmlState *rever
         if (action.event) {
             if (!action.event->isReversable())
                 continue;
+            action.event->saveOriginals();
             for (jj = 0; jj < d->revertList.count(); ++jj) {
                 ActionEvent *event = d->revertList.at(jj).event;
                 if (event && event->typeName() == action.event->typeName()) {
@@ -359,9 +360,6 @@ void QmlState::apply(QmlStateGroup *group, QmlTransition *trans, QmlState *rever
                     }
                 }
             }
-            if (!found)
-                action.event->saveOriginals();
-            //### do we ever need to do saveOriginals when found == true?
         } else {
             action.fromBinding = action.property.binding();
 
diff --git a/src/declarative/util/qmltransitionmanager.cpp b/src/declarative/util/qmltransitionmanager.cpp
index 3e2e05f..7eaccac 100644
--- a/src/declarative/util/qmltransitionmanager.cpp
+++ b/src/declarative/util/qmltransitionmanager.cpp
@@ -144,9 +144,9 @@ void QmlTransitionManager::transition(const QList<Action> &list,
         for (int ii = 0; ii < applyList.size(); ++ii) {
             const Action &action = applyList.at(ii);
             if (action.toBinding) {
-                action.property.setBinding(action.toBinding);
+                action.property.setBinding(action.toBinding, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
             } else if (!action.event) {
-                action.property.write(action.toValue);
+                action.property.write(action.toValue, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
             } else if (action.event->isReversable()) {
                 if (action.reverseEvent)
                     action.event->reverse();
@@ -187,7 +187,7 @@ void QmlTransitionManager::transition(const QList<Action> &list,
             if (action.toBinding)
                 action.property.setBinding(0); // Make sure this is disabled during the transition
 
-            action.property.write(action.fromValue);
+            action.property.write(action.fromValue, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
         }
     }
 
@@ -223,7 +223,7 @@ void QmlTransitionManager::transition(const QList<Action> &list,
     }
 
     // Any actions remaining have not been handled by the transition and should
-    // be applied immediately.  We skip applying transitions, as they are all
+    // be applied immediately.  We skip applying bindings, as they are all
     // applied at the end in applyBindings() to avoid any nastiness mid 
     // transition
     foreach(const Action &action, applyList) {
@@ -232,13 +232,12 @@ void QmlTransitionManager::transition(const QList<Action> &list,
                 action.event->reverse();
             else
                 action.event->execute();
-        } else if (!action.event) {
+        } else if (!action.event && !action.toBinding) {
             action.property.write(action.toValue);
         }
     }
     if (!transition)
         d->applyBindings();
-
 }
 
 void QmlTransitionManager::cancel()