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diff --git a/src/declarative/util/qmlbehavior.cpp b/src/declarative/util/qmlbehavior.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmlbehavior_p.h"
+
+#include "qmlanimation_p.h"
+#include "qmltransition_p.h"
+
+#include <qmlcontext.h>
+#include <qmlinfo.h>
+
+#include <QtCore/qparallelanimationgroup.h>
+
+#include <private/qobject_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QML_DEFINE_TYPE(Qt,4,6,Behavior,QmlBehavior)
+
+class QmlBehaviorPrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QmlBehavior)
+public:
+    QmlBehaviorPrivate() : animation(0), enabled(true) {}
+
+    QmlMetaProperty property;
+    QVariant currentValue;
+    QmlAbstractAnimation *animation;
+    bool enabled;
+};
+
+/*!
+    \qmlclass Behavior QmlBehavior
+    \brief The Behavior element allows you to specify a default animation for a property change.
+
+    Behaviors provide one way to specify \l{qmlanimation.html}{animations} in QML.
+
+    In the 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
+
+    Currently only a single Behavior may be specified for a property;
+    this Behavior can be enabled and disabled via the \l{enabled} property.
+*/
+
+
+QmlBehavior::QmlBehavior(QObject *parent)
+    : QObject(*(new QmlBehaviorPrivate), parent)
+{
+}
+
+QmlBehavior::~QmlBehavior()
+{
+}
+
+/*!
+    \qmlproperty Animation Behavior::animation
+    \default
+
+    The animation to use when the behavior is triggered.
+*/
+
+QmlAbstractAnimation *QmlBehavior::animation()
+{
+    Q_D(QmlBehavior);
+    return d->animation;
+}
+
+void QmlBehavior::setAnimation(QmlAbstractAnimation *animation)
+{
+    Q_D(QmlBehavior);
+    if (d->animation) {
+        qmlInfo(this) << tr("Can't change the animation assigned to a Behavior.");
+        return;
+    }
+
+    d->animation = animation;
+    if (d->animation)
+        d->animation->setTarget(d->property);
+}
+
+/*!
+    \qmlproperty bool Behavior::enabled
+    Whether the Behavior will be triggered when the property it is tracking changes.
+
+    By default a Behavior is enabled.
+*/
+
+bool QmlBehavior::enabled() const
+{
+    Q_D(const QmlBehavior);
+    return d->enabled;
+}
+
+void QmlBehavior::setEnabled(bool enabled)
+{
+    Q_D(QmlBehavior);
+    if (d->enabled == enabled)
+        return;
+    d->enabled = enabled;
+    emit enabledChanged();
+}
+
+void QmlBehavior::write(const QVariant &value)
+{
+    Q_D(QmlBehavior);
+    if (!d->animation || !d->enabled) {
+        d->property.write(value, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
+        return;
+    }
+
+    d->currentValue = d->property.read();
+
+    d->animation->qtAnimation()->stop();
+
+    QmlStateOperation::ActionList actions;
+    QmlAction action;
+    action.property = d->property;
+    action.fromValue = d->currentValue;
+    action.toValue = value;
+    actions << action;
+
+    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)
+{
+    Q_D(QmlBehavior);
+    d->property = property;
+    d->currentValue = property.read();
+    if (d->animation)
+        d->animation->setTarget(property);
+}
+
+QT_END_NAMESPACE