QScroller merge, part 1

This merge consists of the actual kinetic scroller implementation, its
autotests plus a few examples.  QAbstractScrollArea and QAbstractItemView
have been extended to support the new scroll events.

The complete history is in
http://scm.dev.nokia.troll.no/projects/qt/repos/rgriebls-qt-flickgesture/logs/4.7-flickgesture

(part 2 is the QML Flickable replacement / part 3 is QWebView support)

Task-number: QTBUG-9054
Reviewed-by: Ralf Engels

10 files changed, 3861 insertions, 0 deletions

diff --git a/src/gui/util/qflickgesture.cpp b/src/gui/util/qflickgesture.cpp
new file mode 100644
index 0000000..fa04754
--- /dev/null
+++ b/src/gui/util/qflickgesture.cpp
@@ -0,0 +1,677 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 "qgesture.h"
+#include "qcoreapplication.h"
+#include "qevent.h"
+#include "qwidget.h"
+#include "qgraphicsitem.h"
+#include "qgraphicsscene.h"
+#include "qgraphicssceneevent.h"
+#include "qgraphicsview.h"
+#include "qscroller.h"
+#include "private/qevent_p.h"
+#include "private/qflickgesture_p.h"
+#include "qdebug.h"
+
+#ifndef QT_NO_GESTURES
+
+QT_BEGIN_NAMESPACE
+
+//#define QFLICKGESTURE_DEBUG
+
+#ifdef QFLICKGESTURE_DEBUG
+#  define qFGDebug  qDebug
+#else
+#  define qFGDebug  while (false) qDebug
+#endif
+
+extern bool qt_sendSpontaneousEvent(QObject *receiver, QEvent *event);
+
+static QMouseEvent *copyMouseEvent(QEvent *e)
+{
+    switch (e->type()) {
+    case QEvent::MouseButtonPress:
+    case QEvent::MouseButtonRelease:
+    case QEvent::MouseMove: {
+        QMouseEvent *me = static_cast<QMouseEvent *>(e);
+        return new QMouseEvent(me->type(), QPoint(0, 0), me->globalPos(), me->button(), me->buttons(), me->modifiers());
+    }
+    case QEvent::GraphicsSceneMousePress:
+    case QEvent::GraphicsSceneMouseRelease:
+    case QEvent::GraphicsSceneMouseMove: {
+        QGraphicsSceneMouseEvent *me = static_cast<QGraphicsSceneMouseEvent *>(e);
+#if 1
+        QEvent::Type met = me->type() == QEvent::GraphicsSceneMousePress ? QEvent::MouseButtonPress :
+                           (me->type() == QEvent::GraphicsSceneMouseRelease ? QEvent::MouseButtonRelease : QEvent::MouseMove);
+        return new QMouseEvent(met, QPoint(0, 0), me->screenPos(), me->button(), me->buttons(), me->modifiers());
+#else
+        QGraphicsSceneMouseEvent *copy = new QGraphicsSceneMouseEvent(me->type());
+        copy->setPos(me->pos());
+        copy->setScenePos(me->scenePos());
+        copy->setScreenPos(me->screenPos());
+        for (int i = 0x1; i <= 0x10; i <<= 1) {
+            Qt::MouseButton button = Qt::MouseButton(i);
+            copy->setButtonDownPos(button, me->buttonDownPos(button));
+            copy->setButtonDownScenePos(button, me->buttonDownScenePos(button));
+            copy->setButtonDownScreenPos(button, me->buttonDownScreenPos(button));
+        }
+        copy->setLastPos(me->lastPos());
+        copy->setLastScenePos(me->lastScenePos());
+        copy->setLastScreenPos(me->lastScreenPos());
+        copy->setButtons(me->buttons());
+        copy->setButton(me->button());
+        copy->setModifiers(me->modifiers());
+        return copy;
+#endif
+    }
+    default:
+        return 0;
+    }
+}
+
+class PressDelayHandler : public QObject
+{
+private:
+    PressDelayHandler(QObject *parent = 0)
+        : QObject(parent)
+        , pressDelayTimer(0)
+        , sendingEvent(false)
+        , mouseButton(Qt::NoButton)
+        , mouseTarget(0)
+    { }
+
+    static PressDelayHandler *inst;
+
+public:
+    enum {
+        UngrabMouseBefore = 1,
+        RegrabMouseAfterwards = 2
+    };
+
+    static PressDelayHandler *instance()
+    {
+        static PressDelayHandler *inst = 0;
+        if (!inst)
+            inst = new PressDelayHandler(QCoreApplication::instance());
+        return inst;
+    }
+
+    bool shouldEventBeIgnored(QEvent *) const
+    {
+        return sendingEvent;
+    }
+
+    bool isDelaying() const
+    {
+        return !pressDelayEvent.isNull();
+    }
+
+    void pressed(QEvent *e, int delay)
+    {
+        if (!pressDelayEvent) {
+            pressDelayEvent.reset(copyMouseEvent(e));
+            pressDelayTimer = startTimer(delay);
+            mouseTarget = QApplication::widgetAt(pressDelayEvent->globalPos());
+            mouseButton = pressDelayEvent->button();
+            qFGDebug() << "QFG: consuming/delaying mouse press";
+        } else {
+            qFGDebug() << "QFG: NOT consuming/delaying mouse press";
+        }
+        e->setAccepted(true);
+    }
+
+    bool released(QEvent *e, bool scrollerWasActive, bool scrollerIsActive)
+    {
+        // consume this event if the scroller was or is active
+        bool result = scrollerWasActive || scrollerIsActive;
+
+        // stop the timer
+        if (pressDelayTimer) {
+            killTimer(pressDelayTimer);
+            pressDelayTimer = 0;
+        }
+        // we still haven't even sent the press, so do it now
+        if (pressDelayEvent && mouseTarget && !scrollerIsActive) {
+            QScopedPointer<QMouseEvent> releaseEvent(copyMouseEvent(e));
+
+            qFGDebug() << "QFG: re-sending mouse press (due to release) for " << mouseTarget;
+            sendMouseEvent(pressDelayEvent.data(), UngrabMouseBefore);
+
+            qFGDebug() << "QFG: faking mouse release (due to release) for " << mouseTarget;
+            sendMouseEvent(releaseEvent.data());
+
+            result = true; // consume this event
+        } else if (mouseTarget && scrollerIsActive) {
+            // we grabbed the mouse expicitly when the scroller became active, so undo that now
+            sendMouseEvent(0, UngrabMouseBefore);
+        }
+        pressDelayEvent.reset(0);
+        mouseTarget = 0;
+        return result;
+    }
+
+    void scrollerWasIntercepted()
+    {
+        qFGDebug() << "QFG: deleting delayed mouse press, since scroller was only intercepted";
+        if (pressDelayEvent) {
+            // we still haven't even sent the press, so just throw it away now
+            if (pressDelayTimer) {
+                killTimer(pressDelayTimer);
+                pressDelayTimer = 0;
+            }
+            pressDelayEvent.reset(0);
+        }
+        mouseTarget = 0;
+    }
+
+    void scrollerBecameActive()
+    {
+        if (pressDelayEvent) {
+            // we still haven't even sent the press, so just throw it away now
+            qFGDebug() << "QFG: deleting delayed mouse press, since scroller is active now";
+            if (pressDelayTimer) {
+                killTimer(pressDelayTimer);
+                pressDelayTimer = 0;
+            }
+            pressDelayEvent.reset(0);
+            mouseTarget = 0;
+        } else if (mouseTarget) {
+            // we did send a press, so we need to fake a release now
+            Qt::MouseButtons mouseButtons = QApplication::mouseButtons();
+
+            // release all pressed mouse buttons
+            /*for (int i = 0; i < 32; ++i) {
+                if (mouseButtons & (1 << i)) {
+                    Qt::MouseButton b = static_cast<Qt::MouseButton>(1 << i);
+                    mouseButtons &= ~b;
+                    QPoint farFarAway(-QWIDGETSIZE_MAX, -QWIDGETSIZE_MAX);
+
+                    qFGDebug() << "QFG: sending a fake mouse release at far-far-away to " << mouseTarget;
+                    QMouseEvent re(QEvent::MouseButtonRelease, QPoint(), farFarAway,
+                                   b, mouseButtons, QApplication::keyboardModifiers());
+                    sendMouseEvent(&re);
+                }
+            }*/
+
+            QPoint farFarAway(-QWIDGETSIZE_MAX, -QWIDGETSIZE_MAX);
+
+            qFGDebug() << "QFG: sending a fake mouse release at far-far-away to " << mouseTarget;
+            QMouseEvent re(QEvent::MouseButtonRelease, QPoint(), farFarAway,
+                           mouseButton, QApplication::mouseButtons() & ~mouseButton,
+                           QApplication::keyboardModifiers());
+            sendMouseEvent(&re, RegrabMouseAfterwards);
+            // don't clear the mouseTarget just yet, since we need to explicitly ungrab the mouse on release!
+        }
+    }
+
+protected:
+    void timerEvent(QTimerEvent *e)
+    {
+        if (e->timerId() == pressDelayTimer) {
+            if (pressDelayEvent && mouseTarget) {
+                qFGDebug() << "QFG: timer event: re-sending mouse press to " << mouseTarget;
+                sendMouseEvent(pressDelayEvent.data(), UngrabMouseBefore);
+            }
+            pressDelayEvent.reset(0);
+
+            if (pressDelayTimer) {
+                killTimer(pressDelayTimer);
+                pressDelayTimer = 0;
+            }
+        }
+    }
+
+    void sendMouseEvent(QMouseEvent *me, int flags = 0)
+    {
+        if (mouseTarget) {
+            sendingEvent = true;
+
+            QGraphicsItem *grabber = 0;
+            if (mouseTarget->parentWidget()) {
+                if (QGraphicsView *gv = qobject_cast<QGraphicsView *>(mouseTarget->parentWidget())) {
+                    if (gv->scene())
+                        grabber = gv->scene()->mouseGrabberItem();
+                }
+            }
+
+            if (grabber && (flags & UngrabMouseBefore)) {
+                // GraphicsView Mouse Handling Workaround #1:
+                // we need to ungrab the mouse before re-sending the press,
+                // since the scene had already set the mouse grabber to the
+                // original (and consumed) event's receiver
+                qFGDebug() << "QFG: ungrabbing" << grabber;
+                grabber->ungrabMouse();
+            }
+
+            if (me) {
+                QMouseEvent copy(me->type(), mouseTarget->mapFromGlobal(me->globalPos()), me->globalPos(), me->button(), me->buttons(), me->modifiers());
+                qt_sendSpontaneousEvent(mouseTarget, &copy);
+            }
+
+            if (grabber && (flags & RegrabMouseAfterwards)) {
+                // GraphicsView Mouse Handling Workaround #2:
+                // we need to re-grab the mouse after sending a faked mouse
+                // release, since we still need the mouse moves for the gesture
+                // (the scene will clear the item's mouse grabber status on
+                // release).
+                qFGDebug() << "QFG: re-grabbing" << grabber;
+                grabber->grabMouse();
+            }
+            sendingEvent = false;
+        }
+    }
+
+
+private:
+    int pressDelayTimer;
+    QScopedPointer<QMouseEvent> pressDelayEvent;
+    bool sendingEvent;
+    Qt::MouseButton mouseButton;
+    QPointer<QWidget> mouseTarget;
+};
+
+
+/*!
+    \internal
+    \class QFlickGesture
+    \since 4.8
+    \brief The QFlickGesture class describes a flicking gesture made by the user.
+    \ingroup gestures
+    The QFlickGesture is more complex than the QPanGesture that uses QScroller and QScrollerProperties
+    to decide if it is triggered.
+    This gesture is reacting on touch event as compared to the QMouseFlickGesture.
+
+    \sa {Gestures Programming}, QScroller, QScrollerProperties, QMouseFlickGesture
+*/
+
+/*!
+    \internal
+*/
+QFlickGesture::QFlickGesture(QObject *receiver, Qt::MouseButton button, QObject *parent)
+    : QGesture(*new QFlickGesturePrivate, parent)
+{
+    d_func()->q_ptr = this;
+    d_func()->receiver = receiver;
+    d_func()->receiverScroller = (receiver && QScroller::hasScroller(receiver)) ? QScroller::scroller(receiver) : 0;
+    d_func()->button = button;
+}
+
+QFlickGesture::~QFlickGesture()
+{ }
+
+QFlickGesturePrivate::QFlickGesturePrivate()
+    : receiverScroller(0), button(Qt::NoButton), macIgnoreWheel(false)
+{ }
+
+
+//
+// QFlickGestureRecognizer
+//
+
+
+QFlickGestureRecognizer::QFlickGestureRecognizer(Qt::MouseButton button)
+{
+    this->button = button;
+}
+
+/*! \reimp
+ */
+QGesture *QFlickGestureRecognizer::create(QObject *target)
+{
+    QGraphicsObject *go = qobject_cast<QGraphicsObject*>(target);
+    if (go && button == Qt::NoButton) {
+        go->setAcceptTouchEvents(true);
+    }
+    return new QFlickGesture(target, button);
+}
+
+/*! \internal
+    The recognize function detects a touch event suitable to start the attached QScroller.
+    The QFlickGesture will be triggered as soon as the scroller is no longer in the state
+    QScroller::Inactive or QScroller::Pressed. It will be finished or canceled
+    at the next QEvent::TouchEnd.
+    Note that the QScroller might continue scrolling (kinetically) at this point.
+ */
+QGestureRecognizer::Result QFlickGestureRecognizer::recognize(QGesture *state,
+                                                              QObject *watched,
+                                                              QEvent *event)
+{
+    Q_UNUSED(watched);
+
+    static QElapsedTimer monotonicTimer;
+    if (!monotonicTimer.isValid())
+        monotonicTimer.start();
+
+    QFlickGesture *q = static_cast<QFlickGesture *>(state);
+    QFlickGesturePrivate *d = q->d_func();
+
+    QScroller *scroller = d->receiverScroller;
+    if (!scroller)
+        return Ignore; // nothing to do without a scroller?
+
+    QWidget *receiverWidget = qobject_cast<QWidget *>(d->receiver);
+    QGraphicsObject *receiverGraphicsObject = qobject_cast<QGraphicsObject *>(d->receiver);
+
+    // this is only set for events that we inject into the event loop via sendEvent()
+    if (PressDelayHandler::instance()->shouldEventBeIgnored(event)) {
+        //qFGDebug() << state << "QFG: ignored event: " << event->type();
+        return Ignore;
+    }
+
+    const QMouseEvent *me = 0;
+    const QGraphicsSceneMouseEvent *gsme = 0;
+    const QTouchEvent *te = 0;
+    QPoint globalPos;
+
+    // qFGDebug() << "FlickGesture "<<state<<"watched:"<<watched<<"receiver"<<d->receiver<<"event"<<event->type()<<"button"<<button;
+
+    switch (event->type()) {
+    case QEvent::MouseButtonPress:
+    case QEvent::MouseButtonRelease:
+    case QEvent::MouseMove:
+        if (!receiverWidget)
+            return Ignore;
+        if (button != Qt::NoButton) {
+            me = static_cast<const QMouseEvent *>(event);
+            globalPos = me->globalPos();
+        }
+        break;
+    case QEvent::GraphicsSceneMousePress:
+    case QEvent::GraphicsSceneMouseRelease:
+    case QEvent::GraphicsSceneMouseMove:
+        if (!receiverGraphicsObject)
+            return Ignore;
+        if (button != Qt::NoButton) {
+            gsme = static_cast<const QGraphicsSceneMouseEvent *>(event);
+            globalPos = gsme->screenPos();
+        }
+        break;
+    case QEvent::TouchBegin:
+    case QEvent::TouchEnd:
+    case QEvent::TouchUpdate:
+        if (button == Qt::NoButton) {
+            te = static_cast<const QTouchEvent *>(event);
+            if (!te->touchPoints().isEmpty())
+                globalPos = te->touchPoints().at(0).screenPos().toPoint();
+        }
+        break;
+
+#if defined(Q_WS_MAC)
+    // the only way to distinguish between real mouse wheels and wheel
+    // events generated by the native 2 finger swipe gesture is to listen
+    // for these events (according to Apple's Cocoa Event-Handling Guide)
+
+    case QEvent::NativeGesture: {
+        QNativeGestureEvent *nge = static_cast<QNativeGestureEvent *>(event);
+        if (nge->gestureType == QNativeGestureEvent::GestureBegin)
+            d->macIgnoreWheel = true;
+        else if (nge->gestureType == QNativeGestureEvent::GestureEnd)
+            d->macIgnoreWheel = false;
+        break;
+    }
+#endif
+
+    // consume all wheel events if the scroller is active
+    case QEvent::Wheel:
+        if (d->macIgnoreWheel || (scroller->state() != QScroller::Inactive))
+            return Ignore | ConsumeEventHint;
+        break;
+
+    // consume all dbl click events if the scroller is active
+    case QEvent::MouseButtonDblClick:
+        if (scroller->state() != QScroller::Inactive)
+            return Ignore | ConsumeEventHint;
+        break;
+
+    default:
+        break;
+    }
+
+    if (!me && !gsme && !te) // Neither mouse nor touch
+        return Ignore;
+
+    // get the current pointer position in local coordinates.
+    QPointF point;
+    QScroller::Input inputType = (QScroller::Input) 0;
+
+    switch (event->type()) {
+    case QEvent::MouseButtonPress:
+        if (me && me->button() == button && me->buttons() == button) {
+            point = me->globalPos();
+            inputType = QScroller::InputPress;
+        } else if (me) {
+            scroller->stop();
+            return CancelGesture;
+        }
+        break;
+    case QEvent::MouseButtonRelease:
+        if (me && me->button() == button) {
+            point = me->globalPos();
+            inputType = QScroller::InputRelease;
+        }
+        break;
+    case QEvent::MouseMove:
+#ifdef Q_OS_SYMBIAN
+        // Qt on Symbian tracks the button state internally, while Qt on Win/Mac/Unix
+        // relies on the windowing system to report the current buttons state.
+        if (me && (me->buttons() == button || !me->buttons())) {
+#else
+        if (me && me->buttons() == button) {
+#endif
+            point = me->globalPos();
+            inputType = QScroller::InputMove;
+        }
+        break;
+
+    case QEvent::GraphicsSceneMousePress:
+        if (gsme && gsme->button() == button && gsme->buttons() == button) {
+            point = gsme->scenePos();
+            inputType = QScroller::InputPress;
+        } else if (gsme) {
+            scroller->stop();
+            return CancelGesture;
+        }
+        break;
+    case QEvent::GraphicsSceneMouseRelease:
+        if (gsme && gsme->button() == button) {
+            point = gsme->scenePos();
+            inputType = QScroller::InputRelease;
+        }
+        break;
+    case QEvent::GraphicsSceneMouseMove:
+#ifdef Q_OS_SYMBIAN
+        // Qt on Symbian tracks the button state internally, while Qt on Win/Mac/Unix
+        // relies on the windowing system to report the current buttons state.
+        if (gsme && (gsme->buttons() == button || !me->buttons())) {
+#else
+        if (gsme && gsme->buttons() == button) {
+#endif
+            point = gsme->scenePos();
+            inputType = QScroller::InputMove;
+        }
+        break;
+
+    case QEvent::TouchBegin:
+        inputType = QScroller::InputPress;
+        // fall through
+    case QEvent::TouchEnd:
+        if (!inputType)
+            inputType = QScroller::InputRelease;
+        // fallthrough
+    case QEvent::TouchUpdate:
+        if (!inputType)
+            inputType = QScroller::InputMove;
+
+        if (te->deviceType() == QTouchEvent::TouchPad) {
+            if (te->touchPoints().count() != 2)  // 2 fingers on pad
+                return Ignore;
+
+            point = te->touchPoints().at(0).startScenePos() +
+                    ((te->touchPoints().at(0).scenePos() - te->touchPoints().at(0).startScenePos()) +
+                     (te->touchPoints().at(1).scenePos() - te->touchPoints().at(1).startScenePos())) / 2;
+        } else { // TouchScreen
+            if (te->touchPoints().count() != 1) // 1 finger on screen
+                return Ignore;
+
+            point = te->touchPoints().at(0).scenePos();
+        }
+        break;
+
+    default:
+        break;
+    }
+
+    // Check for an active scroller at globalPos
+    if (inputType == QScroller::InputPress) {
+        foreach (QScroller *as, QScroller::activeScrollers()) {
+            if (as != scroller) {
+                QRegion scrollerRegion;
+
+                if (QWidget *w = qobject_cast<QWidget *>(as->target())) {
+                    scrollerRegion = QRect(w->mapToGlobal(QPoint(0, 0)), w->size());
+                } else if (QGraphicsObject *go = qobject_cast<QGraphicsObject *>(as->target())) {
+                    if (go->scene() && !go->scene()->views().isEmpty()) {
+                        foreach (QGraphicsView *gv, go->scene()->views())
+                            scrollerRegion |= gv->mapFromScene(go->mapToScene(go->boundingRect()))
+                                              .translated(gv->mapToGlobal(QPoint(0, 0)));
+                    }
+                }
+                // active scrollers always have priority
+                if (scrollerRegion.contains(globalPos))
+                    return Ignore;
+            }
+        }
+    }
+
+    bool scrollerWasDragging = (scroller->state() == QScroller::Dragging);
+    bool scrollerWasScrolling = (scroller->state() == QScroller::Scrolling);
+
+    if (inputType) {
+        if (QWidget *w = qobject_cast<QWidget *>(d->receiver))
+            point = w->mapFromGlobal(point.toPoint());
+        else if (QGraphicsObject *go = qobject_cast<QGraphicsObject *>(d->receiver))
+            point = go->mapFromScene(point);
+
+        // inform the scroller about the new event
+        scroller->handleInput(inputType, point, monotonicTimer.elapsed());
+    }
+
+    // depending on the scroller state return the gesture state
+    Result result(0);
+    bool scrollerIsActive = (scroller->state() == QScroller::Dragging ||
+                             scroller->state() == QScroller::Scrolling);
+
+    // Consume all mouse events while dragging or scrolling to avoid nasty
+    // side effects with Qt's standard widgets.
+    if ((me || gsme) && scrollerIsActive)
+        result |= ConsumeEventHint;
+
+    // The only problem with this approach is that we consume the
+    // MouseRelease when we start the scrolling with a flick gesture, so we
+    // have to fake a MouseRelease "somewhere" to not mess with the internal
+    // states of Qt's widgets (a QPushButton would stay in 'pressed' state
+    // forever, if it doesn't receive a MouseRelease).
+    if (me || gsme) {
+        if (!scrollerWasDragging && !scrollerWasScrolling && scrollerIsActive)
+            PressDelayHandler::instance()->scrollerBecameActive();
+        else if (scrollerWasScrolling && (scroller->state() == QScroller::Dragging || scroller->state() == QScroller::Inactive))
+            PressDelayHandler::instance()->scrollerWasIntercepted();
+    }
+
+    if (!inputType) {
+        result |= Ignore;
+    } else {
+        switch (event->type()) {
+        case QEvent::MouseButtonPress:
+        case QEvent::GraphicsSceneMousePress:
+            if (scroller->state() == QScroller::Pressed) {
+                int pressDelay = int(1000 * scroller->scrollerProperties().scrollMetric(QScrollerProperties::MousePressEventDelay).toReal());
+                if (pressDelay > 0) {
+                    result |= ConsumeEventHint;
+
+                    PressDelayHandler::instance()->pressed(event, pressDelay);
+                    event->accept();
+                }
+            }
+            // fall through
+        case QEvent::TouchBegin:
+            q->setHotSpot(globalPos);
+            result |= scrollerIsActive ? TriggerGesture : MayBeGesture;
+            break;
+
+        case QEvent::MouseMove:
+        case QEvent::GraphicsSceneMouseMove:
+            if (PressDelayHandler::instance()->isDelaying())
+                result |= ConsumeEventHint;
+            // fall through
+        case QEvent::TouchUpdate:
+            result |= scrollerIsActive ? TriggerGesture : Ignore;
+            break;
+
+        case QEvent::GraphicsSceneMouseRelease:
+        case QEvent::MouseButtonRelease:
+            if (PressDelayHandler::instance()->released(event, scrollerWasDragging || scrollerWasScrolling, scrollerIsActive))
+                result |= ConsumeEventHint;
+            // fall through
+        case QEvent::TouchEnd:
+            result |= scrollerIsActive ? FinishGesture : CancelGesture;
+            break;
+
+        default:
+            result |= Ignore;
+            break;
+        }
+    }
+    return result;
+}
+
+
+/*! \reimp
+ */
+void QFlickGestureRecognizer::reset(QGesture *state)
+{
+    QGestureRecognizer::reset(state);
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GESTURES
diff --git a/src/gui/util/qflickgesture_p.h b/src/gui/util/qflickgesture_p.h
new file mode 100644
index 0000000..c3c263b
--- /dev/null
+++ b/src/gui/util/qflickgesture_p.h
@@ -0,0 +1,113 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QFLICKGESTURE_P_H
+#define QFLICKGESTURE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qevent.h"
+#include "qgesturerecognizer.h"
+#include "private/qgesture_p.h"
+#include "qscroller.h"
+#include "qscopedpointer.h"
+
+#ifndef QT_NO_GESTURES
+
+QT_BEGIN_NAMESPACE
+
+class QFlickGesturePrivate;
+class QGraphicsItem;
+
+class Q_GUI_EXPORT QFlickGesture : public QGesture
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(QFlickGesture)
+
+public:
+    QFlickGesture(QObject *receiver, Qt::MouseButton button, QObject *parent = 0);
+    ~QFlickGesture();
+
+    friend class QFlickGestureRecognizer;
+};
+
+class PressDelayHandler;
+
+class QFlickGesturePrivate : public QGesturePrivate
+{
+    Q_DECLARE_PUBLIC(QFlickGesture)
+public:
+    QFlickGesturePrivate();
+
+    QPointer<QObject> receiver;
+    QScroller *receiverScroller;
+    Qt::MouseButton button; // NoButton == Touch
+    bool macIgnoreWheel;
+    static PressDelayHandler *pressDelayHandler;
+};
+
+class QFlickGestureRecognizer : public QGestureRecognizer
+{
+public:
+    QFlickGestureRecognizer(Qt::MouseButton button);
+
+    QGesture *create(QObject *target);
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
+    void reset(QGesture *state);
+
+private:
+    Qt::MouseButton button; // NoButton == Touch
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GESTURES
+
+#endif // QFLICKGESTURE_P_H
diff --git a/src/gui/util/qscroller.cpp b/src/gui/util/qscroller.cpp
new file mode 100644
index 0000000..d6b7aaf
--- /dev/null
+++ b/src/gui/util/qscroller.cpp
@@ -0,0 +1,1984 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 "qevent.h"
+#include "qwidget.h"
+#include "qscroller.h"
+#include "private/qflickgesture_p.h"
+#include "private/qscroller_p.h"
+#include "qscrollerproperties.h"
+#include "private/qscrollerproperties_p.h"
+#include "qnumeric.h"
+#include "math.h"
+
+#include <QTime>
+#include <QElapsedTimer>
+#include <QMap>
+#include <QApplication>
+#include <QAbstractScrollArea>
+#include <QGraphicsObject>
+#include <QGraphicsScene>
+#include <QGraphicsView>
+#include <QDesktopWidget>
+#include <QtCore/qmath.h>
+#include <QtGui/qevent.h>
+#include <qnumeric.h>
+
+#include <QtDebug>
+
+
+QT_BEGIN_NAMESPACE
+
+bool qt_sendSpontaneousEvent(QObject *receiver, QEvent *event);
+
+//#define QSCROLLER_DEBUG
+
+#ifdef QSCROLLER_DEBUG
+#  define qScrollerDebug  qDebug
+#else
+#  define qScrollerDebug  while (false) qDebug
+#endif
+
+QDebug &operator<<(QDebug &dbg, const QScrollerPrivate::ScrollSegment &s)
+{
+    dbg << "\n  Time: start:" << s.startTime << " duration:" << s.deltaTime;
+    dbg << "\n  Pos: start:" << s.startPos << " delta:" << s.deltaPos;
+    dbg << "\n  Curve: type:" << s.curve.type() << " max progress:" << s.maxProgress << "\n";
+    return dbg;
+}
+
+
+// a few helper operators to make the code below a lot more readable:
+// otherwise a lot of ifs would have to be multi-line to check both the x
+// and y coordinate separately.
+
+// returns true only if the abs. value of BOTH x and y are <= f
+inline bool operator<=(const QPointF &p, qreal f)
+{
+    return (qAbs(p.x()) <= f) && (qAbs(p.y()) <= f);
+}
+
+// returns true only if the abs. value of BOTH x and y are < f
+inline bool operator<(const QPointF &p, qreal f)
+{
+    return (qAbs(p.x()) < f) && (qAbs(p.y()) < f);
+}
+
+// returns true if the abs. value of EITHER x or y are >= f
+inline bool operator>=(const QPointF &p, qreal f)
+{
+    return (qAbs(p.x()) >= f) || (qAbs(p.y()) >= f);
+}
+
+// returns true if the abs. value of EITHER x or y are > f
+inline bool operator>(const QPointF &p, qreal f)
+{
+    return (qAbs(p.x()) > f) || (qAbs(p.y()) > f);
+}
+
+// returns a new point with both coordinates having the abs. value of the original one
+inline QPointF qAbs(const QPointF &p)
+{
+    return QPointF(qAbs(p.x()), qAbs(p.y()));
+}
+
+// returns a new point with all components of p1 multiplied by the corresponding components of p2
+inline QPointF operator*(const QPointF &p1, const QPointF &p2)
+{
+    return QPointF(p1.x() * p2.x(), p1.y() * p2.y());
+}
+
+// returns a new point with all components of p1 divided by the corresponding components of p2
+inline QPointF operator/(const QPointF &p1, const QPointF &p2)
+{
+    return QPointF(p1.x() / p2.x(), p1.y() / p2.y());
+}
+
+inline QPointF clampToRect(const QPointF &p, const QRectF &rect)
+{
+    qreal x = qBound(rect.left(), p.x(), rect.right());
+    qreal y = qBound(rect.top(), p.y(), rect.bottom());
+    return QPointF(x, y);
+}
+
+// returns -1, 0 or +1 according to r being <0, ==0 or >0
+inline int qSign(qreal r)
+{
+    return (r < 0) ? -1 : ((r > 0) ? 1 : 0);
+}
+
+// this version is not mathematically exact, but it just works for every
+// easing curve type (even custom ones)
+
+static qreal differentialForProgress(const QEasingCurve &curve, qreal pos)
+{
+    const qreal dx = 0.01;
+    qreal left = (pos < qreal(0.5)) ? pos : pos - qreal(dx);
+    qreal right = (pos >= qreal(0.5)) ? pos : pos + qreal(dx);
+    qreal d = (curve.valueForProgress(right) - curve.valueForProgress(left)) / qreal(dx);
+
+    //qScrollerDebug() << "differentialForProgress(type: " << curve.type() << ", pos: " << pos << ") = " << d;
+
+    return d;
+}
+
+// this version is not mathematically exact, but it just works for every
+// easing curve type (even custom ones)
+
+static qreal progressForValue(const QEasingCurve &curve, qreal value)
+{
+    if (curve.type() >= QEasingCurve::InElastic &&
+        curve.type() < QEasingCurve::Custom) {
+        qWarning("progressForValue(): QEasingCurves of type %d do not have an inverse, since they are not injective.", curve.type());
+        return value;
+    }
+    if (value < qreal(0) || value > qreal(1))
+        return value;
+
+    qreal progress = value, left(0), right(1);
+    for (int iterations = 6; iterations; --iterations) {
+        qreal v = curve.valueForProgress(progress);
+        if (v < value)
+            left = progress;
+        else if (v > value)
+            right = progress;
+        else
+            break;
+        progress = (left + right) / qreal(2);
+    }
+    return progress;
+}
+
+
+class QScrollTimer : public QAbstractAnimation
+{
+public:
+    QScrollTimer(QScrollerPrivate *_d)
+        : d(_d), ignoreUpdate(false), skip(0)
+    { }
+
+    int duration() const
+    {
+        return -1;
+    }
+
+    void start()
+    {
+        // QAbstractAnimation::start() will immediately call
+        // updateCurrentTime(), but our state is not set correctly yet
+        ignoreUpdate = true;
+        QAbstractAnimation::start();
+        ignoreUpdate = false;
+        skip = 0;
+    }
+
+protected:
+    void updateCurrentTime(int /*currentTime*/)
+   {
+        if (!ignoreUpdate) {
+            if (++skip >= d->frameRateSkip()) {
+                skip = 0;
+                d->timerTick();
+            }
+        }
+    }
+
+private:
+    QScrollerPrivate *d;
+    bool ignoreUpdate;
+    int skip;
+};
+
+/*!
+    \class QScroller
+    \brief The QScroller class enables kinetic scrolling for any scrolling widget or graphics item.
+    \since 4.8
+
+    With kinetic scrolling, the user can push the widget in a given
+    direction and it will continue to scroll in this direction until it is
+    stopped either by the user or by friction.  Aspects of inertia, friction
+    and other physical concepts can be changed in order to fine-tune an
+    intuitive user experience.
+
+    The QScroller object is the object that stores the current position and
+    speed of the scrolling and takes care of updates.
+    QScroller can be triggered by a flick gesture
+
+    \code
+        QWidget *w = ...;
+        QScroller::grabGesture(w, QScroller::LeftMouseButtonGesture);
+    \endcode
+
+    or directly like this:
+
+    \code
+        QWidget *w = ...;
+        QScroller *scroller = QScroller::scroller(w);
+        scroller->scrollTo(QPointF(100, 100));
+    \endcode
+
+    The scrolled QObjects will be receive a QScrollPrepareEvent whenever the scroller needs to
+    update its geometry information and a QScrollEvent whenever the content of the object should
+    actually be scrolled.
+
+    The scroller uses the global QAbstractAnimation timer to generate its QScrollEvents, but this
+    can be slowed down with QScrollerProperties::FrameRate on a per-QScroller basis.
+
+    Several examples in the \c scroller examples directory show how QScroller,
+    QScrollEvent and the scroller gesture can be used.
+
+    Even though this kinetic scroller has a huge number of settings available via
+    QScrollerProperties, we recommend that you leave them all at their default, platform optimized
+    values. In case you really want to change them you can experiment with the \c plot example in
+    the \c scroller examples directory first.
+
+    \sa QScrollEvent, QScrollPrepareEvent, QScrollerProperties
+*/
+
+
+QMap<QObject *, QScroller *> QScrollerPrivate::allScrollers;
+QSet<QScroller *> QScrollerPrivate::activeScrollers;
+
+/*!
+    Returns \c true if a QScroller object was already created for \a target; \c false otherwise.
+
+    \sa scroller()
+*/
+bool QScroller::hasScroller(QObject *target)
+{
+    return (QScrollerPrivate::allScrollers.value(target));
+}
+
+/*!
+    Returns the scroller for the given \a target.
+    As long as the object exist this function will always return the same QScroller.
+    If a QScroller does not exist yet for the \a target, it will implicitly be created.
+    At no point will two QScrollers be active on one object.
+
+    \sa hasScroller(), target()
+*/
+QScroller *QScroller::scroller(QObject *target)
+{
+    if (!target) {
+        qWarning("QScroller::scroller() was called with a null target.");
+        return 0;
+    }
+
+    if (QScrollerPrivate::allScrollers.contains(target))
+        return QScrollerPrivate::allScrollers.value(target);
+
+    QScroller *s = new QScroller(target);
+    QScrollerPrivate::allScrollers.insert(target, s);
+    return s;
+}
+
+/*!
+    \overload
+    This is the const version of scroller().
+*/
+const QScroller *QScroller::scroller(const QObject *target)
+{
+    return scroller(const_cast<QObject*>(target));
+}
+
+/*!
+    Returns an application wide list of currently active, i.e. state() !=
+    QScroller::Inactive, QScroller objects.
+    This routine is mostly useful when writing your own gesture recognizer.
+*/
+QList<QScroller *> QScroller::activeScrollers()
+{
+    return QScrollerPrivate::activeScrollers.toList();
+}
+
+/*!
+    Returns the target object of this scroller.
+    \sa hasScroller(), scroller()
+ */
+QObject *QScroller::target() const
+{
+    Q_D(const QScroller);
+    return d->target;
+}
+
+/*!
+    \fn QScroller::scrollerPropertiesChanged(const QScrollerProperties &newProperties);
+
+    QScroller emits this signal whenever its scroller properties have been
+    changed. \a newProperties are the new scroller properties.
+
+    \sa scrollerProperties
+*/
+
+
+/*! \property QScroller::scrollerProperties
+    \brief The scroller properties of this scroller.
+    The properties will be used by the QScroller to determine its scrolling behaviour.
+*/
+QScrollerProperties QScroller::scrollerProperties() const
+{
+    Q_D(const QScroller);
+    return d->properties;
+}
+
+void QScroller::setScrollerProperties(const QScrollerProperties &sp)
+{
+    Q_D(QScroller);
+    if (d->properties != sp) {
+        d->properties = sp;
+        emit scrollerPropertiesChanged(sp);
+
+        // we need to force the recalculation here, since the overshootPolicy may have changed and
+        // exisiting segments may include an overshoot animation.
+        d->recalcScrollingSegments(true);
+    }
+}
+
+
+/*!
+    Registers a custom scroll gesture recognizer and grabs it for the \a
+    target and returns the resulting gesture type.  If \a scrollGestureType is
+    set to TouchGesture the gesture will trigger on touch events - if set to
+    one of LeftMouseButtonGesture, RightMouseButtonGesture or
+    MiddleMouseButtonGesture it will trigger on mouse events of the
+    corresponding button.
+
+    Only one scroll gesture can be active on a single object at the same
+    time, so if you call this function twice on the same object, it will
+    ungrab the existing gesture before grabbing the new one.
+
+    Please note: To avoid nasty side-effects, all mouse events will be
+    consumed while the gesture is triggered.  Since the mouse press event is
+    not consumed, the gesture needs to also send a fake mouse release event
+    at the global position \c{(INT_MIN, INT_MIN)} to make sure that it
+    doesn't mess with the internal states of the widget that received the
+    mouse press in the first place (which could e.g.  be a QPushButton
+    inside a QScrollArea).
+*/
+Qt::GestureType QScroller::grabGesture(QObject *target, ScrollerGestureType scrollGestureType)
+{
+    // ensure that a scroller for target is created
+    QScroller *s = scroller(target);
+    if (!s)
+        return Qt::GestureType(0);
+
+    QScrollerPrivate *sp = s->d_ptr;
+    if (sp->recognizer)
+        ungrabGesture(target); // ungrab the old gesture
+
+    Qt::MouseButton button;
+    switch (scrollGestureType) {
+    case LeftMouseButtonGesture  : button = Qt::LeftButton; break;
+    case RightMouseButtonGesture : button = Qt::RightButton; break;
+    case MiddleMouseButtonGesture: button = Qt::MiddleButton; break;
+    default                      :
+    case TouchGesture            : button = Qt::NoButton; break; // NoButton == Touch
+    }
+
+    sp->recognizer = new QFlickGestureRecognizer(button);
+    sp->recognizerType = QGestureRecognizer::registerRecognizer(sp->recognizer);
+
+    if (target->isWidgetType()) {
+        QWidget *widget = static_cast<QWidget *>(target);
+        widget->grabGesture(sp->recognizerType);
+        if (scrollGestureType == TouchGesture)
+            widget->setAttribute(Qt::WA_AcceptTouchEvents);
+
+    } else if(QGraphicsObject *go = qobject_cast<QGraphicsObject*>(target)) {
+        if (scrollGestureType == TouchGesture)
+            go->setAcceptTouchEvents(true);
+        go->grabGesture(sp->recognizerType);
+    }
+    return sp->recognizerType;
+}
+
+/*!
+    Returns the gesture type currently grabbed for the \a target or 0 if no
+    gesture is grabbed.
+*/
+Qt::GestureType QScroller::grabbedGesture(QObject *target)
+{
+    QScroller *s = scroller(target);
+    if (s && s->d_ptr)
+        return s->d_ptr->recognizerType;
+    else
+        return Qt::GestureType(0);
+}
+
+/*!
+    Ungrabs the gesture for the \a target.
+*/
+void QScroller::ungrabGesture(QObject *target)
+{
+    QScroller *s = scroller(target);
+    if (!s)
+        return;
+
+    QScrollerPrivate *sp = s->d_ptr;
+    if (!sp->recognizer)
+        return; // nothing to do
+
+    if (target->isWidgetType()) {
+        QWidget *widget = static_cast<QWidget *>(target);
+        widget->ungrabGesture(sp->recognizerType);
+
+    } else if(QGraphicsObject *go = qobject_cast<QGraphicsObject*>(target)) {
+        go->ungrabGesture(sp->recognizerType);
+    }
+
+    QGestureRecognizer::unregisterRecognizer(sp->recognizerType);
+    // do not delete the recognizer. The QGestureManager is doing this.
+    sp->recognizer = 0;
+}
+
+/*!
+    \internal
+*/
+QScroller::QScroller(QObject *target)
+    : d_ptr(new QScrollerPrivate(this, target))
+{
+    Q_ASSERT(target); // you can't create a scroller without a target in any normal way
+    Q_D(QScroller);
+    d->init();
+}
+
+/*!
+    \internal
+*/
+QScroller::~QScroller()
+{
+    Q_D(QScroller);
+    QGestureRecognizer::unregisterRecognizer(d->recognizerType);
+    // do not delete the recognizer. The QGestureManager is doing this.
+    d->recognizer = 0;
+    QScrollerPrivate::allScrollers.remove(d->target);
+    QScrollerPrivate::activeScrollers.remove(this);
+
+    delete d_ptr;
+}
+
+
+/*!
+    \fn QScroller::stateChanged(QScroller::State newState);
+
+    QScroller emits this signal whenever the state changes. \a newState is the new State.
+
+    \sa state
+*/
+
+/*!
+    \property QScroller::state
+    \brief the state of the scroller
+
+    \sa QScroller::State
+*/
+QScroller::State QScroller::state() const
+{
+    Q_D(const QScroller);
+    return d->state;
+}
+
+/*!
+    Stops the scroller and resets the state back to Inactive.
+*/
+void QScroller::stop()
+{
+    Q_D(QScroller);
+    if (d->state != Inactive) {
+        QPointF here = clampToRect(d->contentPosition, d->contentPosRange);
+        qreal snapX = d->nextSnapPos(here.x(), 0, Qt::Horizontal);
+        qreal snapY = d->nextSnapPos(here.y(), 0, Qt::Vertical);
+        QPointF snap = here;
+        if (!qIsNaN(snapX))
+            snap.setX(snapX);
+        if (!qIsNaN(snapY))
+            snap.setY(snapY);
+        d->contentPosition = snap;
+        d->overshootPosition = QPointF(0, 0);
+
+        d->setState(Inactive);
+    }
+}
+
+/*!
+    \brief Returns the pixel per meter metric for the scrolled widget.
+
+    The value is reported for both the x and y axis separately by using a QPointF.
+
+    \note Please note that this value should be physically correct, while the actual DPI settings
+    that Qt returns for the display may be reported wrongly (on purpose) by the underlying
+    windowing system (e.g. Mac OS X or Maemo 5).
+*/
+QPointF QScroller::pixelPerMeter() const
+{
+    Q_D(const QScroller);
+    QPointF ppm = d->pixelPerMeter;
+
+    if (QGraphicsObject *go = qobject_cast<QGraphicsObject *>(d->target)) {
+        QTransform viewtr;
+        //TODO: the first view isn't really correct - maybe use an additional field in the prepare event?
+        if (go->scene() && !go->scene()->views().isEmpty())
+            viewtr = go->scene()->views().first()->viewportTransform();
+        QTransform tr = go->deviceTransform(viewtr);
+        if (tr.isScaling()) {
+            QPointF p0 = tr.map(QPointF(0, 0));
+            QPointF px = tr.map(QPointF(1, 0));
+            QPointF py = tr.map(QPointF(0, 1));
+            ppm.rx() /= QLineF(p0, px).length();
+            ppm.ry() /= QLineF(p0, py).length();
+        }
+    }
+    return ppm;
+}
+
+/*!
+    \brief Returns the current velocity of the scroller.
+
+    Returns the current scrolling velocity in meter per second when in the state Scrolling.
+    Returns a null velocity otherwise.
+
+    The velocity is reported for both the x and y axis separately by using a QPointF.
+
+    \sa pixelPerMeter()
+*/
+QPointF QScroller::velocity() const
+{
+    Q_D(const QScroller);
+    const QScrollerPropertiesPrivate *sp = d->properties.d.data();
+
+     switch (state()) {
+     case Dragging:
+        return d->releaseVelocity;
+     case Scrolling: {
+        QPointF vel;
+        qint64 now = d->monotonicTimer.elapsed();
+
+        if (!d->xSegments.isEmpty()) {
+            const QScrollerPrivate::ScrollSegment &s = d->xSegments.head();
+            qreal progress = qreal(now - s.startTime) / (qreal(s.deltaTime) / s.maxProgress);
+            qreal v = qSign(s.deltaPos) * qreal(s.deltaTime) / s.maxProgress / qreal(1000) * sp->decelerationFactor * qreal(0.5) * differentialForProgress(s.curve, progress);
+            vel.setX(v);
+        }
+
+        if (!d->ySegments.isEmpty()) {
+            const QScrollerPrivate::ScrollSegment &s = d->ySegments.head();
+            qreal progress = qreal(now - s.startTime) / (qreal(s.deltaTime) / s.maxProgress);
+            qreal v = qSign(s.deltaPos) * qreal(s.deltaTime) / s.maxProgress / qreal(1000) * sp->decelerationFactor * qreal(0.5) * differentialForProgress(s.curve, progress);
+            vel.setY(v);
+        }
+        //qScrollerDebug() << "Velocity: " << vel;
+        return vel;
+     }
+     default:
+         return QPointF(0, 0);
+     }
+}
+
+/*!
+    \brief Returns the target position for the scroll movement.
+
+    Returns the planned final position for the current scroll movement or the current
+    position if the scroller is not in the scrolling state.
+    The result is undefined when the scroller is in the inactive state.
+
+    The target position is in pixel.
+
+    \sa pixelPerMeter(), scrollTo()
+*/
+QPointF QScroller::finalPosition() const
+{
+    Q_D(const QScroller);
+    return QPointF(d->scrollingSegmentsEndPos(Qt::Horizontal),
+                   d->scrollingSegmentsEndPos(Qt::Vertical));
+}
+
+/*!
+    Starts scrolling the widget so that point \a pos is at the top-left position in
+    the viewport.
+
+    The behaviour when scrolling outside the valid scroll area is undefined.
+    In this case the scroller might or might not overshoot.
+
+    The scrolling speed will be calculated so that the given position will
+    be reached after a platform-defined time span (e.g. 1 second for Maemo 5).
+
+    \a pos is given in viewport coordinates.
+
+    \sa ensureVisible()
+*/
+void QScroller::scrollTo(const QPointF &pos)
+{
+    // we could make this adjustable via QScrollerProperties
+    scrollTo(pos, 300);
+}
+
+/*! \overload
+
+    This version will reach its destination position in \a scrollTime milli seconds.
+*/
+void QScroller::scrollTo(const QPointF &pos, int scrollTime)
+{
+    Q_D(QScroller);
+
+    if (d->state == Pressed || d->state == Dragging )
+        return;
+
+    // no need to resend a prepare event if we are already scrolling
+    if (d->state == Inactive && !d->prepareScrolling(QPointF()))
+        return;
+
+    QPointF newpos = clampToRect(pos, d->contentPosRange);
+    qreal snapX = d->nextSnapPos(newpos.x(), 0, Qt::Horizontal);
+    qreal snapY = d->nextSnapPos(newpos.y(), 0, Qt::Vertical);
+    if (!qIsNaN(snapX))
+        newpos.setX(snapX);
+    if (!qIsNaN(snapY))
+        newpos.setY(snapY);
+
+    qScrollerDebug() << "QScroller::scrollTo(req:" << pos << " [pix] / snap:" << newpos << ", " << scrollTime << " [ms])";
+
+    if (newpos == d->contentPosition + d->overshootPosition)
+        return;
+
+    QPointF vel = velocity();
+
+    if (scrollTime < 0)
+        scrollTime = 0;
+    qreal time = qreal(scrollTime) / 1000;
+
+    d->createScrollToSegments(vel.x(), time, newpos.x(), Qt::Horizontal, QScrollerPrivate::ScrollTypeScrollTo);
+    d->createScrollToSegments(vel.y(), time, newpos.y(), Qt::Vertical, QScrollerPrivate::ScrollTypeScrollTo);
+
+    if (!scrollTime)
+        d->setContentPositionHelperScrolling();
+    d->setState(scrollTime ? Scrolling : Inactive);
+}
+
+/*!
+    Starts scrolling so that the rectangle \a rect is visible inside the
+    viewport with additional margins specified in pixels by \a xmargin and \a ymargin around
+    the rect.
+
+    In cases where it is not possible to fit the rect plus margins inside the viewport the contents
+    are scrolled so that as much as possible is visible from \a rect.
+
+    The scrolling speed will be calculated so that the given position will
+    be reached after a platform-defined time span (e.g. 1 second for Maemo 5).
+
+    This function performs the actual scrolling by calling scrollTo().
+*/
+void QScroller::ensureVisible(const QRectF &rect, qreal xmargin, qreal ymargin)
+{
+    // we could make this adjustable via QScrollerProperties
+    ensureVisible(rect, xmargin, ymargin, 1000);
+}
+
+/*! \overload
+
+    This version will reach its destination position in \a scrollTime milli seconds.
+*/
+void QScroller::ensureVisible(const QRectF &rect, qreal xmargin, qreal ymargin, int scrollTime)
+{
+    Q_D(QScroller);
+
+    if (d->state == Pressed || d->state == Dragging )
+        return;
+
+    if (d->state == Inactive && !d->prepareScrolling(QPointF()))
+        return;
+
+    // -- calculate the current pos (or the position after the current scroll)
+    QPointF startPos = d->contentPosition + d->overshootPosition;
+    startPos = QPointF(d->scrollingSegmentsEndPos(Qt::Horizontal),
+                       d->scrollingSegmentsEndPos(Qt::Vertical));
+
+    QRectF marginRect(rect.x() - xmargin, rect.y() - ymargin,
+                      rect.width() + 2 * xmargin, rect.height() + 2 * ymargin);
+
+    QSizeF visible = d->viewportSize;
+    QRectF visibleRect(startPos, visible);
+
+    qScrollerDebug() << "QScroller::ensureVisible(" << rect << " [pix], " << xmargin << " [pix], " << ymargin << " [pix], " << scrollTime << "[ms])";
+    qScrollerDebug() << "  --> content position:" << d->contentPosition;
+
+    if (visibleRect.contains(marginRect))
+        return;
+
+    QPointF newPos = startPos;
+
+    if (visibleRect.width() < rect.width()) {
+        // at least try to move the rect into view
+        if (rect.left() > visibleRect.left())
+            newPos.setX(rect.left());
+        else if (rect.right() < visibleRect.right())
+            newPos.setX(rect.right() - visible.width());
+
+    } else if (visibleRect.width() < marginRect.width()) {
+        newPos.setX(rect.center().x() - visibleRect.width() / 2);
+    } else if (marginRect.left() > visibleRect.left()) {
+        newPos.setX(marginRect.left());
+    } else if (marginRect.right() < visibleRect.right()) {
+        newPos.setX(marginRect.right() - visible.width());
+    }
+
+    if (visibleRect.height() < rect.height()) {
+        // at least try to move the rect into view
+        if (rect.top() > visibleRect.top())
+            newPos.setX(rect.top());
+        else if (rect.bottom() < visibleRect.bottom())
+            newPos.setX(rect.bottom() - visible.height());
+
+    } else if (visibleRect.height() < marginRect.height()) {
+        newPos.setY(rect.center().y() - visibleRect.height() / 2);
+    } else if (marginRect.top() > visibleRect.top()) {
+        newPos.setY(marginRect.top());
+    } else if (marginRect.bottom() < visibleRect.bottom()) {
+        newPos.setY(marginRect.bottom() - visible.height());
+    }
+
+    // clamp to maximum content position
+    newPos = clampToRect(newPos, d->contentPosRange);
+    if (newPos == startPos)
+        return;
+
+    scrollTo(newPos, scrollTime);
+}
+
+/*! This function resends the QScrollPrepareEvent.
+ *  Calling resendPrepareEvent triggers a QScrollPrepareEvent from the scroller.
+ *  This will allow the receiver to re-set content position and content size while
+ *  scrolling.
+ *  Calling this function while in the Inactive state is useless as the prepare event
+ *  is send again right before scrolling starts.
+ */
+void QScroller::resendPrepareEvent()
+{
+    Q_D(QScroller);
+    d->prepareScrolling(d->pressPosition);
+}
+
+/*! Set the snap positions for the horizontal axis.
+ *  Set the snap positions to a list of \a positions.
+ *  This will overwrite all previously set snap positions and also a previously
+ *  set snapping interval.
+ *  Snapping can be deactivated by setting an empty list of positions.
+ */
+void QScroller::setSnapPositionsX(const QList<qreal> &positions)
+{
+    Q_D(QScroller);
+    d->snapPositionsX = positions;
+    d->snapIntervalX = 0.0;
+
+    d->recalcScrollingSegments();
+}
+
+/*! Set the snap positions for the horizontal axis.
+ *  Set the snap positions to regular spaced intervals.
+ *  The first snap position will be at \a first from the beginning of the list. The next at \a first + \a interval and so on.
+ *  This can be used to implement a list header.
+ *  This will overwrite all previously set snap positions and also a previously
+ *  set snapping interval.
+ *  Snapping can be deactivated by setting an interval of 0.0
+ */
+void QScroller::setSnapPositionsX(qreal first, qreal interval)
+{
+    Q_D(QScroller);
+    d->snapFirstX = first;
+    d->snapIntervalX = interval;
+    d->snapPositionsX.clear();
+
+    d->recalcScrollingSegments();
+}
+
+/*! Set the snap positions for the vertical axis.
+ *  Set the snap positions to a list of \a positions.
+ *  This will overwrite all previously set snap positions and also a previously
+ *  set snapping interval.
+ *  Snapping can be deactivated by setting an empty list of positions.
+ */
+void QScroller::setSnapPositionsY(const QList<qreal> &positions)
+{
+    Q_D(QScroller);
+    d->snapPositionsY = positions;
+    d->snapIntervalY = 0.0;
+
+    d->recalcScrollingSegments();
+}
+
+/*! Set the snap positions for the vertical axis.
+ *  Set the snap positions to regular spaced intervals.
+ *  The first snap position will be at \a first. The next at \a first + \a interval and so on.
+ *  This will overwrite all previously set snap positions and also a previously
+ *  set snapping interval.
+ *  Snapping can be deactivated by setting an interval of 0.0
+ */
+void QScroller::setSnapPositionsY(qreal first, qreal interval)
+{
+    Q_D(QScroller);
+    d->snapFirstY = first;
+    d->snapIntervalY = interval;
+    d->snapPositionsY.clear();
+
+    d->recalcScrollingSegments();
+}
+
+
+
+// -------------- private ------------
+
+QScrollerPrivate::QScrollerPrivate(QScroller *q, QObject *_target)
+    : target(_target)
+    , recognizer(0)
+    , recognizerType(Qt::CustomGesture)
+    , state(QScroller::Inactive)
+    , firstScroll(true)
+    , pressTimestamp(0)
+    , lastTimestamp(0)
+    , snapFirstX(-1.0)
+    , snapIntervalX(0.0)
+    , snapFirstY(-1.0)
+    , snapIntervalY(0.0)
+    , scrollTimer(new QScrollTimer(this))
+    , q_ptr(q)
+{
+    connect(target, SIGNAL(destroyed(QObject*)), this, SLOT(targetDestroyed()));
+}
+
+void QScrollerPrivate::init()
+{
+    setDpiFromWidget(0);
+    monotonicTimer.start();
+}
+
+void QScrollerPrivate::sendEvent(QObject *o, QEvent *e)
+{
+    qt_sendSpontaneousEvent(o, e);
+}
+
+const char *QScrollerPrivate::stateName(QScroller::State state)
+{
+    switch (state) {
+    case QScroller::Inactive:  return "inactive";
+    case QScroller::Pressed:   return "pressed";
+    case QScroller::Dragging:  return "dragging";
+    case QScroller::Scrolling: return "scrolling";
+    default:                   return "(invalid)";
+    }
+}
+
+const char *QScrollerPrivate::inputName(QScroller::Input input)
+{
+    switch (input) {
+    case QScroller::InputPress:   return "press";
+    case QScroller::InputMove:    return "move";
+    case QScroller::InputRelease: return "release";
+    default:                      return "(invalid)";
+    }
+}
+
+void QScrollerPrivate::targetDestroyed()
+{
+    scrollTimer->stop();
+    delete q_ptr;
+}
+
+void QScrollerPrivate::timerTick()
+{
+    struct timerevent {
+        QScroller::State state;
+        typedef void (QScrollerPrivate::*timerhandler_t)();
+        timerhandler_t handler;
+    };
+
+    timerevent timerevents[] = {
+        { QScroller::Dragging, &QScrollerPrivate::timerEventWhileDragging },
+        { QScroller::Scrolling, &QScrollerPrivate::timerEventWhileScrolling },
+    };
+
+    for (int i = 0; i < int(sizeof(timerevents) / sizeof(*timerevents)); ++i) {
+        timerevent *te = timerevents + i;
+
+        if (state == te->state) {
+            (this->*te->handler)();
+            return;
+        }
+    }
+
+    scrollTimer->stop();
+}
+
+/*!
+    This function is used by gesture recognizers to inform the scroller about a new input event.
+    The scroller will change its internal state() according to the input event and its attached
+    scroller properties.  Since the scroller doesn't care about the actual kind of input device the
+    event came from, you need to decompose the event into the \a input type, a \a position and a
+    milli-second \a timestamp.  The \a position needs to be in the target's coordinate system.
+    The return value is \c true if the event should be consumed by the calling filter or \c false
+    if the event should be forwarded to the control.
+
+    \note Using grabGesture() should be sufficient for most use cases though.
+*/
+bool QScroller::handleInput(Input input, const QPointF &position, qint64 timestamp)
+{
+    Q_D(QScroller);
+
+    qScrollerDebug() << "QScroller::handleInput(" << input << ", " << d->stateName(d->state) << ", " << position << ", " << timestamp << ")";
+    struct statechange {
+        State state;
+        Input input;
+        typedef bool (QScrollerPrivate::*inputhandler_t)(const QPointF &position, qint64 timestamp);
+        inputhandler_t handler;
+    };
+
+    statechange statechanges[] = {
+        { QScroller::Inactive,  InputPress,   &QScrollerPrivate::pressWhileInactive },
+        { QScroller::Pressed,   InputMove,    &QScrollerPrivate::moveWhilePressed },
+        { QScroller::Pressed,   InputRelease, &QScrollerPrivate::releaseWhilePressed },
+        { QScroller::Dragging,  InputMove,    &QScrollerPrivate::moveWhileDragging },
+        { QScroller::Dragging,  InputRelease, &QScrollerPrivate::releaseWhileDragging },
+        { QScroller::Scrolling, InputPress,   &QScrollerPrivate::pressWhileScrolling }
+    };
+
+    for (int i = 0; i < int(sizeof(statechanges) / sizeof(*statechanges)); ++i) {
+        statechange *sc = statechanges + i;
+
+         if (d->state == sc->state && input == sc->input)
+             return (d->*sc->handler)(position - d->overshootPosition, timestamp);
+    }
+    return false;
+}
+
+#ifdef Q_WS_MAEMO_5
+
+QPointF QScrollerPrivate::realDpi(int screen)
+{
+    Q_UNUSED(screen);
+    // The DPI value is hardcoded to 96 on Maemo5:
+    // https://projects.maemo.org/bugzilla/show_bug.cgi?id=152525
+    // This value (260) is only correct for the N900 though, but
+    // there's no way to get the real DPI at run time.
+    return QPointF(260, 260);
+}
+
+#elif defined(Q_WS_MAC)
+
+// implemented in qscroller_mac.mm
+
+#else
+
+QPointF QScrollerPrivate::realDpi(int screen)
+{
+    QWidget *w = QApplication::desktop()->screen(screen);
+    return QPointF(w->physicalDpiX(), w->physicalDpiY());
+}
+
+#endif
+
+/*! \internal
+    Returns the resolution of the used screen.
+*/
+QPointF QScrollerPrivate::dpi() const
+{
+    return pixelPerMeter / qreal(39.3700787);
+}
+
+/*! \internal
+    Sets the resolution used for scrolling.
+    This resolution is only used by the kinetic scroller. If you change this
+    then the scroller will behave quite different as a lot of the values are
+    given in physical distances (millimeter).
+*/
+void QScrollerPrivate::setDpi(const QPointF &dpi)
+{
+    pixelPerMeter = dpi * qreal(39.3700787);
+}
+
+/*! \internal
+    Sets the dpi used for scrolling to the value of the widget.
+*/
+void QScrollerPrivate::setDpiFromWidget(QWidget *widget)
+{
+    QDesktopWidget *dw = QApplication::desktop();
+    setDpi(realDpi(widget ? dw->screenNumber(widget) : dw->primaryScreen()));
+}
+
+/*! \internal
+    Updates the velocity during dragging.
+    Sets releaseVelocity.
+*/
+void QScrollerPrivate::updateVelocity(const QPointF &deltaPixelRaw, qint64 deltaTime)
+{
+    Q_Q(QScroller);
+    QPointF ppm = q->pixelPerMeter();
+    const QScrollerPropertiesPrivate *sp = properties.d.data();
+    QPointF deltaPixel = deltaPixelRaw;
+
+    qScrollerDebug() << "QScroller::updateVelocity(" << deltaPixelRaw << " [delta pix], " << deltaTime << " [delta ms])";
+
+    // faster than 2.5mm/ms seems bogus (that would be a screen height in ~20 ms)
+    if (((deltaPixelRaw / qreal(deltaTime)).manhattanLength() / ((ppm.x() + ppm.y()) / 2) * 1000) > qreal(2.5))
+        deltaPixel = deltaPixelRaw * qreal(2.5) * ppm / 1000 / (deltaPixelRaw / qreal(deltaTime)).manhattanLength();
+
+    qreal inversSmoothingFactor = ((qreal(1) - sp->dragVelocitySmoothingFactor) * qreal(deltaTime) / qreal(1000));
+    QPointF newv = -deltaPixel / qreal(deltaTime) * qreal(1000) / ppm;
+    newv = newv * (qreal(1) - inversSmoothingFactor) + releaseVelocity * inversSmoothingFactor;
+
+    if (deltaPixel.x())
+        releaseVelocity.setX(qBound(-sp->maximumVelocity, newv.x(), sp->maximumVelocity));
+    if (deltaPixel.y())
+        releaseVelocity.setY(qBound(-sp->maximumVelocity, newv.y(), sp->maximumVelocity));
+
+    qScrollerDebug() << "  --> new velocity:" << releaseVelocity;
+}
+
+void QScrollerPrivate::pushSegment(ScrollType type, qreal deltaTime, qreal startPos, qreal endPos, QEasingCurve::Type curve, Qt::Orientation orientation, qreal maxProgress)
+{
+    if (startPos == endPos)
+        return;
+
+    ScrollSegment s;
+    if (orientation == Qt::Horizontal && !xSegments.isEmpty())
+        s.startTime = xSegments.last().startTime + xSegments.last().deltaTime;
+    else if (orientation == Qt::Vertical && !ySegments.isEmpty())
+        s.startTime = ySegments.last().startTime + ySegments.last().deltaTime;
+    else
+        s.startTime = monotonicTimer.elapsed();
+
+    s.startPos = startPos;
+    s.deltaPos = endPos - startPos;
+    s.deltaTime = deltaTime * 1000;
+    s.maxProgress = maxProgress;
+    s.curve.setType(curve);
+    s.type = type;
+
+    if (orientation == Qt::Horizontal)
+        xSegments.enqueue(s);
+    else
+        ySegments.enqueue(s);
+
+    qScrollerDebug() << "+++ Added a new ScrollSegment: " << s;
+}
+
+
+/*! \internal
+    Clears the old segments and recalculates them if the current segments are not longer valid
+*/
+void QScrollerPrivate::recalcScrollingSegments(bool forceRecalc)
+{
+    Q_Q(QScroller);
+    QPointF ppm = q->pixelPerMeter();
+
+    releaseVelocity = q->velocity();
+
+    if (forceRecalc || !scrollingSegmentsValid(Qt::Horizontal))
+        createScrollingSegments(releaseVelocity.x(), contentPosition.x() + overshootPosition.x(), ppm.x(), Qt::Horizontal);
+
+    if (forceRecalc || !scrollingSegmentsValid(Qt::Vertical))
+        createScrollingSegments(releaseVelocity.y(), contentPosition.y() + overshootPosition.y(), ppm.y(), Qt::Vertical);
+}
+
+/*! \internal
+    Returns the end position after the current scroll has finished.
+*/
+qreal QScrollerPrivate::scrollingSegmentsEndPos(Qt::Orientation orientation) const
+{
+    const QQueue<ScrollSegment> *segments;
+    qreal endPos;
+
+    if (orientation == Qt::Horizontal) {
+        segments = &xSegments;
+        endPos = contentPosition.x() + overshootPosition.x();
+    } else {
+        segments = &ySegments;
+        endPos = contentPosition.y() + overshootPosition.y();
+    }
+
+    if (!segments->isEmpty()) {
+        const ScrollSegment &last = segments->last();
+        endPos = last.startPos + last.deltaPos;
+    }
+
+    return endPos;
+}
+
+/*! \internal
+    Checks if the scroller segment end in a valid position.
+*/
+bool QScrollerPrivate::scrollingSegmentsValid(Qt::Orientation orientation)
+{
+    QQueue<ScrollSegment> *segments;
+    qreal minPos;
+    qreal maxPos;
+
+    if (orientation == Qt::Horizontal) {
+        segments = &xSegments;
+        minPos = contentPosRange.left();
+        maxPos = contentPosRange.right();
+    } else {
+        segments = &ySegments;
+        minPos = contentPosRange.top();
+        maxPos = contentPosRange.bottom();
+    }
+
+    if (segments->isEmpty())
+        return true;
+
+    const ScrollSegment &last = segments->last();
+    qreal endPos = last.startPos + last.deltaPos;
+
+    if (last.type == ScrollTypeScrollTo)
+        return true; // scrollTo is always valid
+
+    if (last.type == ScrollTypeOvershoot &&
+        endPos != minPos && endPos != maxPos)
+        return false;
+
+    if (endPos < minPos || endPos > maxPos)
+        return false;
+
+    if (endPos == minPos || endPos == maxPos) // the begin and the end of the list are always ok
+        return true;
+
+    qreal nextSnap = nextSnapPos(endPos, 0, orientation);
+    if (!qIsNaN(nextSnap) && endPos != nextSnap)
+        return false;
+
+    return true;
+}
+
+/*! \internal
+   Creates the sections needed to scroll to the specific \a endPos to the segments queue.
+*/
+void QScrollerPrivate::createScrollToSegments(qreal v, qreal deltaTime, qreal endPos, Qt::Orientation orientation, ScrollType type)
+{
+    Q_UNUSED(v);
+
+    if (orientation == Qt::Horizontal) {
+        xSegments.clear();
+    } else {
+        ySegments.clear();
+    }
+
+    qScrollerDebug() << "+++ createScrollToSegments: t:" << deltaTime << "ep:" << endPos << "o:" << int(orientation);
+
+    const QScrollerPropertiesPrivate *sp = properties.d.data();
+
+    qreal startPos = (orientation == Qt::Horizontal) ? contentPosition.x() + overshootPosition.x()
+                                                     : contentPosition.y() + overshootPosition.y();
+    qreal deltaPos = endPos - startPos;
+
+    pushSegment(type, deltaTime * 0.3, startPos, startPos + deltaPos * 0.5, QEasingCurve::InQuad, orientation);
+    pushSegment(type, deltaTime * 0.7, startPos + deltaPos * 0.5, endPos, sp->scrollingCurve.type(), orientation);
+}
+
+/*! \internal
+*/
+void QScrollerPrivate::createScrollingSegments(qreal v, qreal startPos, qreal ppm, Qt::Orientation orientation)
+{
+    const QScrollerPropertiesPrivate *sp = properties.d.data();
+
+    QScrollerProperties::OvershootPolicy policy;
+    qreal minPos;
+    qreal maxPos;
+    qreal viewSize;
+
+    if (orientation == Qt::Horizontal) {
+        xSegments.clear();
+        policy = sp->hOvershootPolicy;
+        minPos = contentPosRange.left();
+        maxPos = contentPosRange.right();
+        viewSize = viewportSize.width();
+    } else {
+        ySegments.clear();
+        policy = sp->vOvershootPolicy;
+        minPos = contentPosRange.top();
+        maxPos = contentPosRange.bottom();
+        viewSize = viewportSize.height();
+    }
+
+    bool alwaysOvershoot = (policy == QScrollerProperties::OvershootAlwaysOn);
+    bool noOvershoot = (policy == QScrollerProperties::OvershootAlwaysOff) || !sp->overshootScrollDistanceFactor;
+    bool canOvershoot = !noOvershoot && (alwaysOvershoot || maxPos);
+
+    qScrollerDebug() << "+++ createScrollingSegments: s:" << startPos << "maxPos:" << maxPos << "o:" << int(orientation);
+
+    // -- check if we are in overshoot
+    if (startPos < minPos) {
+        createScrollToSegments(v, sp->overshootScrollTime * 0.5, minPos, orientation, ScrollTypeOvershoot);
+        return;
+    }
+
+    if (startPos > maxPos) {
+        createScrollToSegments(v, sp->overshootScrollTime * 0.5, maxPos, orientation, ScrollTypeOvershoot);
+        return;
+    }
+
+    qScrollerDebug() << "v = " << v << ", decelerationFactor = " << sp->decelerationFactor << ", curveType = " << sp->scrollingCurve.type();
+
+    // This is only correct for QEasingCurve::OutQuad (linear velocity,
+    // constant deceleration), but the results look and feel ok for OutExpo
+    // and OutSine as well
+
+    // v(t) = deltaTime * a * 0.5 * differentialForProgress(t / deltaTime)
+    // v(0) = vrelease
+    // v(deltaTime) = 0
+    // deltaTime = (2 * vrelease) / (a * differntial(0))
+
+    // pos(t) = integrate(v(t)dt)
+    // pos(t) = vrelease * t - 0.5 * a * t * t
+    // pos(t) = deltaTime * a * 0.5 * progress(t / deltaTime) * deltaTime
+    // deltaPos = pos(deltaTime)
+
+    qreal deltaTime = (qreal(2) * qAbs(v)) / (sp->decelerationFactor * differentialForProgress(sp->scrollingCurve, 0));
+    qreal deltaPos = qSign(v) * deltaTime * deltaTime * qreal(0.5) * sp->decelerationFactor * ppm;
+    qreal endPos = startPos + deltaPos;
+
+    qScrollerDebug() << "  Real Delta:" << deltaPos;
+
+    // -- determine snap points
+    qreal nextSnap = nextSnapPos(endPos, 0, orientation);
+    qreal lowerSnapPos = nextSnapPos(startPos, -1, orientation);
+    qreal higherSnapPos = nextSnapPos(startPos, 1, orientation);
+
+    qScrollerDebug() << "  Real Delta:" << lowerSnapPos <<"-"<<nextSnap <<"-"<<higherSnapPos;
+
+    // - check if we can reach another snap point
+    if (nextSnap > higherSnapPos || qIsNaN(higherSnapPos))
+        higherSnapPos = nextSnap;
+    if (nextSnap < lowerSnapPos || qIsNaN(lowerSnapPos))
+        lowerSnapPos = nextSnap;
+
+    if (qAbs(v) < sp->minimumVelocity) {
+
+        qScrollerDebug() << "### below minimum Vel" << orientation;
+
+        // - no snap points or already at one
+        if (qIsNaN(nextSnap) || nextSnap == startPos)
+            return; // nothing to do, no scrolling needed.
+
+        // - decide which point to use
+
+        qreal snapDistance = higherSnapPos - lowerSnapPos;
+
+        qreal pressDistance = (orientation == Qt::Horizontal) ?
+            lastPosition.x() - pressPosition.x() :
+            lastPosition.y() - pressPosition.y();
+
+        // if not dragged far enough, pick the next snap point.
+        if (sp->snapPositionRatio == 0.0 || qAbs(pressDistance / sp->snapPositionRatio) > snapDistance)
+            endPos = nextSnap;
+        else if (pressDistance < 0.0)
+            endPos = lowerSnapPos;
+        else
+            endPos = higherSnapPos;
+
+        deltaPos = endPos - startPos;
+        pushSegment(ScrollTypeFlick, sp->snapTime * 0.3, startPos, startPos + deltaPos * 0.3, QEasingCurve::InQuad, orientation);
+        pushSegment(ScrollTypeFlick, sp->snapTime * 0.7, startPos + deltaPos * 0.3, endPos, sp->scrollingCurve.type(), orientation);
+        return;
+    }
+
+    // - go to the next snappoint if there is one
+    if (v > 0 && !qIsNaN(higherSnapPos)) {
+        // change the time in relation to the changed end position
+        if (endPos - startPos)
+            deltaTime *= qAbs((higherSnapPos - startPos) / (endPos - startPos));
+        if (deltaTime > sp->snapTime)
+            deltaTime = sp->snapTime;
+        endPos = higherSnapPos;
+
+    } else if (v < 0 && !qIsNaN(lowerSnapPos)) {
+        // change the time in relation to the changed end position
+        if (endPos - startPos)
+            deltaTime *= qAbs((lowerSnapPos - startPos) / (endPos - startPos));
+        if (deltaTime > sp->snapTime)
+            deltaTime = sp->snapTime;
+        endPos = lowerSnapPos;
+
+    // -- check if we are overshooting
+    } else if (endPos < minPos || endPos > maxPos) {
+        qreal stopPos = endPos < minPos ? minPos : maxPos;
+
+        qScrollerDebug() << "Overshoot: delta:" << (stopPos - startPos);
+
+        qreal maxProgress = progressForValue(sp->scrollingCurve, qAbs((stopPos - startPos) / deltaPos));
+        qScrollerDebug() << "Overshoot maxp:" << maxProgress;
+
+        pushSegment(ScrollTypeFlick, deltaTime * maxProgress, startPos, stopPos, sp->scrollingCurve.type(), orientation, maxProgress);
+
+        if (canOvershoot) {
+            qreal endV = qSign(v) * deltaTime * sp->decelerationFactor * qreal(0.5) * differentialForProgress(sp->scrollingCurve, maxProgress);
+            qScrollerDebug() << "Overshoot: velocity" << endV;
+            qScrollerDebug() << "Overshoot: maxVelocity" << sp->maximumVelocity;
+            qScrollerDebug() << "Overshoot: viewsize" << viewSize;
+            qScrollerDebug() << "Overshoot: factor" << sp->overshootScrollDistanceFactor;
+
+            qreal oDistance = viewSize * sp->overshootScrollDistanceFactor * endV / sp->maximumVelocity;
+            qreal oDeltaTime = sp->overshootScrollTime;
+
+            pushSegment(ScrollTypeOvershoot, oDeltaTime * 0.5, stopPos, stopPos + oDistance, sp->scrollingCurve.type(), orientation);
+            pushSegment(ScrollTypeOvershoot, oDeltaTime * 0.3, stopPos + oDistance, stopPos + oDistance * 0.3, QEasingCurve::InQuad, orientation);
+            pushSegment(ScrollTypeOvershoot, oDeltaTime * 0.2, stopPos + oDistance * 0.3, stopPos, QEasingCurve::OutQuad, orientation);
+        }
+        return;
+    }
+
+    pushSegment(ScrollTypeFlick, deltaTime, startPos, endPos, sp->scrollingCurve.type(), orientation);
+}
+
+
+/*! Prepares scrolling by sending a QScrollPrepareEvent to the receiver widget.
+    Returns true if the scrolling was accepted and a target was returned.
+*/
+bool QScrollerPrivate::prepareScrolling(const QPointF &position)
+{
+    QScrollPrepareEvent spe(position);
+    spe.ignore();
+    sendEvent(target, &spe);
+
+    qScrollerDebug() << "QScrollPrepareEvent returned from" << target << "with" << spe.isAccepted() << "mcp:" << spe.contentPosRange() << "cp:" << spe.contentPos();
+    if (spe.isAccepted()) {
+        QPointF oldContentPos = contentPosition + overshootPosition;
+        QPointF contentDelta = spe.contentPos() - oldContentPos;
+
+        viewportSize = spe.viewportSize();
+        contentPosRange = spe.contentPosRange();
+        if (contentPosRange.width() < 0)
+            contentPosRange.setWidth(0);
+        if (contentPosRange.height() < 0)
+            contentPosRange.setHeight(0);
+        contentPosition = clampToRect(spe.contentPos(), contentPosRange);
+        overshootPosition = spe.contentPos() - contentPosition;
+
+        // - check if the content position was moved
+        if (contentDelta != QPointF(0, 0)) {
+            // need to correct all segments
+            for (int i = 0; i < xSegments.count(); i++)
+                xSegments[i].startPos -= contentDelta.x();
+
+            for (int i = 0; i < ySegments.count(); i++)
+                ySegments[i].startPos -= contentDelta.y();
+        }
+
+        if (QWidget *w = qobject_cast<QWidget *>(target))
+            setDpiFromWidget(w);
+        if (QGraphicsObject *go = qobject_cast<QGraphicsObject *>(target)) {
+            //TODO: the first view isn't really correct - maybe use an additional field in the prepare event?
+            if (go->scene() && !go->scene()->views().isEmpty())
+                setDpiFromWidget(go->scene()->views().first());
+        }
+
+        if (state == QScroller::Scrolling) {
+            recalcScrollingSegments();
+        }
+        return true;
+    }
+
+    return false;
+}
+
+void QScrollerPrivate::handleDrag(const QPointF &position, qint64 timestamp)
+{
+    const QScrollerPropertiesPrivate *sp = properties.d.data();
+
+    QPointF deltaPixel = position - lastPosition;
+    qint64 deltaTime = timestamp - lastTimestamp;
+
+    if (sp->axisLockThreshold) {
+        int dx = qAbs(deltaPixel.x());
+        int dy = qAbs(deltaPixel.y());
+        if (dx || dy) {
+            bool vertical = (dy > dx);
+            qreal alpha = qreal(vertical ? dx : dy) / qreal(vertical ? dy : dx);
+            //qScrollerDebug() << "QScroller::handleDrag() -- axis lock:" << alpha << " / " << axisLockThreshold << "- isvertical:" << vertical << "- dx:" << dx << "- dy:" << dy;
+            if (alpha <= sp->axisLockThreshold) {
+                if (vertical)
+                    deltaPixel.setX(0);
+                else
+                    deltaPixel.setY(0);
+            }
+        }
+    }
+
+    // calculate velocity (if the user would release the mouse NOW)
+    updateVelocity(deltaPixel, deltaTime);
+
+    // restrict velocity, if content is not scrollable
+    QRectF max = contentPosRange;
+    bool canScrollX = (max.width() > 0) || (sp->hOvershootPolicy == QScrollerProperties::OvershootAlwaysOn);
+    bool canScrollY = (max.height() > 0) || (sp->vOvershootPolicy == QScrollerProperties::OvershootAlwaysOn);
+
+    if (!canScrollX) {
+        deltaPixel.setX(0);
+        releaseVelocity.setX(0);
+    }
+    if (!canScrollY) {
+        deltaPixel.setY(0);
+        releaseVelocity.setY(0);
+    }
+
+//    if (firstDrag) {
+//        // Do not delay the first drag
+//        setContentPositionHelper(q->contentPosition() - overshootDistance - deltaPixel);
+//        dragDistance = QPointF(0, 0);
+//    } else {
+    dragDistance += deltaPixel;
+//    }
+//qScrollerDebug() << "######################" << deltaPixel << position.y() << lastPosition.y();
+    if (canScrollX)
+        lastPosition.setX(position.x());
+    if (canScrollY)
+        lastPosition.setY(position.y());
+    lastTimestamp = timestamp;
+}
+
+bool QScrollerPrivate::pressWhileInactive(const QPointF &position, qint64 timestamp)
+{
+    if (prepareScrolling(position)) {
+        const QScrollerPropertiesPrivate *sp = properties.d.data();
+
+        if (!contentPosRange.isNull() ||
+            (sp->hOvershootPolicy == QScrollerProperties::OvershootAlwaysOn) ||
+            (sp->vOvershootPolicy == QScrollerProperties::OvershootAlwaysOn)) {
+
+            lastPosition = pressPosition = position;
+            lastTimestamp = pressTimestamp = timestamp;
+            setState(QScroller::Pressed);
+        }
+    }
+    return false;
+}
+
+bool QScrollerPrivate::releaseWhilePressed(const QPointF &, qint64)
+{
+    if (overshootPosition != QPointF(0.0, 0.0)) {
+        setState(QScroller::Scrolling);
+        return true;
+    } else {
+        setState(QScroller::Inactive);
+        return false;
+    }
+}
+
+bool QScrollerPrivate::moveWhilePressed(const QPointF &position, qint64 timestamp)
+{
+    Q_Q(QScroller);
+    const QScrollerPropertiesPrivate *sp = properties.d.data();
+    QPointF ppm = q->pixelPerMeter();
+
+    QPointF deltaPixel = position - pressPosition;
+
+    bool moveAborted = false;
+    bool moveStarted = (((deltaPixel / ppm).manhattanLength()) > sp->dragStartDistance);
+
+    // check the direction of the mouse drag and abort if it's too much in the wrong direction.
+    if (moveStarted) {
+        QRectF max = contentPosRange;
+        bool canScrollX = (max.width() > 0);
+        bool canScrollY = (max.height() > 0);
+
+        if (sp->hOvershootPolicy == QScrollerProperties::OvershootAlwaysOn)
+            canScrollX = true;
+        if (sp->vOvershootPolicy == QScrollerProperties::OvershootAlwaysOn)
+            canScrollY = true;
+
+        if (qAbs(deltaPixel.x() / ppm.x()) < qAbs(deltaPixel.y() / ppm.y())) {
+            if (!canScrollY)
+                moveAborted = true;
+        } else {
+            if (!canScrollX)
+                moveAborted = true;
+        }
+    }
+
+    if (moveAborted) {
+        setState(QScroller::Inactive);
+        moveStarted = false;
+
+    } else if (moveStarted) {
+        setState(QScroller::Dragging);
+
+        // subtract the dragStartDistance
+        deltaPixel = deltaPixel - deltaPixel * (sp->dragStartDistance / deltaPixel.manhattanLength());
+
+        if (deltaPixel != QPointF(0, 0)) {
+            // handleDrag updates lastPosition, lastTimestamp and velocity
+            handleDrag(pressPosition + deltaPixel, timestamp);
+        }
+    }
+    return moveStarted;
+}
+
+bool QScrollerPrivate::moveWhileDragging(const QPointF &position, qint64 timestamp)
+{
+    // handleDrag updates lastPosition, lastTimestamp and velocity
+    handleDrag(position, timestamp);
+    return true;
+}
+
+void QScrollerPrivate::timerEventWhileDragging()
+{
+    if (dragDistance != QPointF(0, 0)) {
+        qScrollerDebug() << "QScroller::timerEventWhileDragging() -- dragDistance:" << dragDistance;
+
+        setContentPositionHelperDragging(-dragDistance);
+        dragDistance = QPointF(0, 0);
+    }
+}
+
+bool QScrollerPrivate::releaseWhileDragging(const QPointF &position, qint64 timestamp)
+{
+    Q_Q(QScroller);
+    const QScrollerPropertiesPrivate *sp = properties.d.data();
+
+    // check if we moved at all - this can happen if you stop a running
+    // scroller with a press and release shortly afterwards
+    QPointF deltaPixel = position - pressPosition;
+    if (((deltaPixel / q->pixelPerMeter()).manhattanLength()) > sp->dragStartDistance) {
+
+        // handle accelerating flicks
+        if ((oldVelocity != QPointF(0, 0)) && sp->acceleratingFlickMaximumTime &&
+            ((timestamp - pressTimestamp) < qint64(sp->acceleratingFlickMaximumTime * 1000))) {
+
+            // - determine if the direction was changed
+            int signX = 0, signY = 0;
+            if (releaseVelocity.x())
+                signX = (releaseVelocity.x() > 0) == (oldVelocity.x() > 0) ? 1 : -1;
+            if (releaseVelocity.y())
+                signY = (releaseVelocity.y() > 0) == (oldVelocity.y() > 0) ? 1 : -1;
+
+            if (signX > 0)
+                releaseVelocity.setX(qBound(-sp->maximumVelocity,
+                                            oldVelocity.x() * sp->acceleratingFlickSpeedupFactor,
+                                            sp->maximumVelocity));
+            if (signY > 0)
+                releaseVelocity.setY(qBound(-sp->maximumVelocity,
+                                            oldVelocity.y() * sp->acceleratingFlickSpeedupFactor,
+                                            sp->maximumVelocity));
+        }
+    }
+
+    QPointF ppm = q->pixelPerMeter();
+    createScrollingSegments(releaseVelocity.x(), contentPosition.x() + overshootPosition.x(), ppm.x(), Qt::Horizontal);
+    createScrollingSegments(releaseVelocity.y(), contentPosition.y() + overshootPosition.y(), ppm.y(), Qt::Vertical);
+
+    qScrollerDebug() << "QScroller::releaseWhileDragging() -- velocity:" << releaseVelocity << "-- minimum velocity:" << sp->minimumVelocity << "overshoot" << overshootPosition;
+
+    if (xSegments.isEmpty() && ySegments.isEmpty())
+        setState(QScroller::Inactive);
+    else
+        setState(QScroller::Scrolling);
+
+    return true;
+}
+
+void QScrollerPrivate::timerEventWhileScrolling()
+{
+    qScrollerDebug() << "QScroller::timerEventWhileScrolling()";
+
+    setContentPositionHelperScrolling();
+    if (xSegments.isEmpty() && ySegments.isEmpty())
+        setState(QScroller::Inactive);
+}
+
+bool QScrollerPrivate::pressWhileScrolling(const QPointF &position, qint64 timestamp)
+{
+    Q_Q(QScroller);
+
+    if ((q->velocity() <= properties.d->maximumClickThroughVelocity) &&
+        (overshootPosition == QPointF(0.0, 0.0))) {
+        setState(QScroller::Inactive);
+        return false;
+    } else {
+        lastPosition = pressPosition = position;
+        lastTimestamp = pressTimestamp = timestamp;
+        setState(QScroller::Pressed);
+        setState(QScroller::Dragging);
+        return true;
+    }
+}
+
+/*! \internal
+    This function handles all state changes of the scroller.
+*/
+void QScrollerPrivate::setState(QScroller::State newstate)
+{
+    Q_Q(QScroller);
+    bool sendLastScroll = false;
+
+    if (state == newstate)
+        return;
+
+    qScrollerDebug() << q << "QScroller::setState(" << stateName(newstate) << ")";
+
+    switch (newstate) {
+    case QScroller::Inactive:
+        scrollTimer->stop();
+
+        // send the last scroll event (but only after the current state change was finished)
+        if (!firstScroll)
+            sendLastScroll = true;
+
+        releaseVelocity = QPointF(0, 0);
+        break;
+
+    case QScroller::Pressed:
+        scrollTimer->stop();
+
+        oldVelocity = releaseVelocity;
+        releaseVelocity = QPointF(0, 0);
+        break;
+
+    case QScroller::Dragging:
+        dragDistance = QPointF(0, 0);
+        if (state == QScroller::Pressed)
+            scrollTimer->start();
+        break;
+
+    case QScroller::Scrolling:
+        scrollTimer->start();
+        break;
+    }
+
+    qSwap(state, newstate);
+
+    if (sendLastScroll) {
+        QScrollEvent se(contentPosition, overshootPosition, QScrollEvent::ScrollFinished);
+        sendEvent(target, &se);
+        firstScroll = true;
+    }
+    if (state == QScroller::Dragging || state == QScroller::Scrolling)
+        activeScrollers.insert(q);
+    else
+        activeScrollers.remove(q);
+    emit q->stateChanged(state);
+}
+
+
+/*! \internal
+    Helps when setting the content position.
+    It will try to move the content by the requested delta but stop in case
+    when we are coming back from an overshoot or a scrollTo.
+    It will also indicate a new overshooting condition by the overshootX and oversthootY flags.
+
+    In this cases it will reset the velocity variables and other flags.
+
+    Also keeps track of the current over-shooting value in overshootPosition.
+
+    \a deltaPos is the amount of pixels the current content position should be moved
+*/
+void QScrollerPrivate::setContentPositionHelperDragging(const QPointF &deltaPos)
+{
+    Q_Q(QScroller);
+    QPointF ppm = q->pixelPerMeter();
+    const QScrollerPropertiesPrivate *sp = properties.d.data();
+    QPointF v = q->velocity();
+
+    if (sp->overshootDragResistanceFactor)
+        overshootPosition /= sp->overshootDragResistanceFactor;
+
+    QPointF oldPos = contentPosition + overshootPosition;
+    QPointF newPos = oldPos + deltaPos;
+
+    qScrollerDebug() << "QScroller::setContentPositionHelperDragging(" << deltaPos << " [pix])";
+    qScrollerDebug() << "  --> overshoot:" << overshootPosition << "- old pos:" << oldPos << "- new pos:" << newPos;
+
+    QPointF oldClampedPos = clampToRect(oldPos, contentPosRange);
+    QPointF newClampedPos = clampToRect(newPos, contentPosRange);
+
+    // --- handle overshooting and stop if the coordinate is going back inside the normal area
+    bool alwaysOvershootX = (sp->hOvershootPolicy == QScrollerProperties::OvershootAlwaysOn);
+    bool alwaysOvershootY = (sp->vOvershootPolicy == QScrollerProperties::OvershootAlwaysOn);
+    bool noOvershootX = (sp->hOvershootPolicy == QScrollerProperties::OvershootAlwaysOff) ||
+                        ((state == QScroller::Dragging) && !sp->overshootDragResistanceFactor) ||
+                        !sp->overshootDragDistanceFactor;
+    bool noOvershootY = (sp->vOvershootPolicy == QScrollerProperties::OvershootAlwaysOff) ||
+                        ((state == QScroller::Dragging) && !sp->overshootDragResistanceFactor) ||
+                        !sp->overshootDragDistanceFactor;
+    bool canOvershootX = !noOvershootX && (alwaysOvershootX || contentPosRange.width());
+    bool canOvershootY = !noOvershootY && (alwaysOvershootY || contentPosRange.height());
+
+    qreal oldOvershootX = (canOvershootX) ? oldPos.x() - oldClampedPos.x() : 0;
+    qreal oldOvershootY = (canOvershootY) ? oldPos.y() - oldClampedPos.y() : 0;
+
+    qreal newOvershootX = (canOvershootX) ? newPos.x() - newClampedPos.x() : 0;
+    qreal newOvershootY = (canOvershootY) ? newPos.y() - newClampedPos.y() : 0;
+
+    qreal maxOvershootX = viewportSize.width() * sp->overshootDragDistanceFactor;
+    qreal maxOvershootY = viewportSize.height() * sp->overshootDragDistanceFactor;
+
+    qScrollerDebug() << "  --> noOs:" << noOvershootX << "drf:" << sp->overshootDragResistanceFactor << "mdf:" << sp->overshootScrollDistanceFactor << "ossP:"<<sp->hOvershootPolicy;
+    qScrollerDebug() << "  --> canOS:" << canOvershootX << "newOS:" << newOvershootX << "maxOS:" << maxOvershootX;
+
+    if (sp->overshootDragResistanceFactor) {
+        oldOvershootX *= sp->overshootDragResistanceFactor;
+        oldOvershootY *= sp->overshootDragResistanceFactor;
+        newOvershootX *= sp->overshootDragResistanceFactor;
+        newOvershootY *= sp->overshootDragResistanceFactor;
+    }
+
+    // -- stop at the maximum overshoot distance
+
+    newOvershootX = qBound(-maxOvershootX, newOvershootX, maxOvershootX);
+    newOvershootY = qBound(-maxOvershootY, newOvershootY, maxOvershootY);
+
+    overshootPosition.setX(newOvershootX);
+    overshootPosition.setY(newOvershootY);
+    contentPosition = newClampedPos;
+
+    QScrollEvent se(contentPosition, overshootPosition, firstScroll ? QScrollEvent::ScrollStarted : QScrollEvent::ScrollUpdated);
+    sendEvent(target, &se);
+    firstScroll = false;
+
+    qScrollerDebug() << "  --> new position:" << newClampedPos << "- new overshoot:" << overshootPosition <<
+                        "- overshoot x/y?:" << overshootPosition;
+}
+
+
+qreal QScrollerPrivate::nextSegmentPosition(QQueue<ScrollSegment> &segments, qint64 now, qreal oldPos)
+{
+    qreal pos = oldPos;
+
+    // check the X segments for new positions
+    while (!segments.isEmpty()) {
+        const ScrollSegment s = segments.head();
+
+        if ((s.startTime + s.deltaTime) <= now) {
+            segments.dequeue();
+            pos = s.startPos + s.deltaPos;
+        } else if (s.startTime <= now) {
+            qreal progress = qreal(now - s.startTime) / (qreal(s.deltaTime) / s.maxProgress);
+            pos = s.startPos + s.deltaPos * s.curve.valueForProgress(progress) / s.curve.valueForProgress(s.maxProgress);
+            break;
+        } else {
+            break;
+        }
+    }
+    return pos;
+}
+
+void QScrollerPrivate::setContentPositionHelperScrolling()
+{
+    qint64 now = monotonicTimer.elapsed();
+    QPointF newPos = contentPosition + overshootPosition;
+
+    newPos.setX(nextSegmentPosition(xSegments, now, newPos.x()));
+    newPos.setY(nextSegmentPosition(ySegments, now, newPos.y()));
+
+    // -- set the position and handle overshoot
+    qScrollerDebug() << "QScroller::setContentPositionHelperScrolling()";
+    qScrollerDebug() << "  --> overshoot:" << overshootPosition << "- new pos:" << newPos;
+
+    QPointF newClampedPos = clampToRect(newPos, contentPosRange);
+
+    overshootPosition = newPos - newClampedPos;
+    contentPosition = newClampedPos;
+
+    QScrollEvent se(contentPosition, overshootPosition, firstScroll ? QScrollEvent::ScrollStarted : QScrollEvent::ScrollUpdated);
+    sendEvent(target, &se);
+    firstScroll = false;
+
+    qScrollerDebug() << "  --> new position:" << newClampedPos << "- new overshoot:" << overshootPosition;
+}
+
+/*! \internal
+ *  Returns the next snap point in direction.
+ *  If \a direction >0 it will return the next snap point that is larger than the current position.
+ *  If \a direction <0 it will return the next snap point that is smaller than the current position.
+ *  If \a direction ==0 it will return the nearest snap point (or the current position if we are already
+ *  on a snap point.
+ *  Returns the nearest snap position or NaN if no such point could be found.
+ */
+qreal QScrollerPrivate::nextSnapPos(qreal p, int dir, Qt::Orientation orientation)
+{
+    qreal bestSnapPos = Q_QNAN;
+    qreal bestSnapPosDist = Q_INFINITY;
+
+    qreal minPos;
+    qreal maxPos;
+
+    if (orientation == Qt::Horizontal) {
+        minPos = contentPosRange.left();
+        maxPos = contentPosRange.right();
+    } else {
+        minPos = contentPosRange.top();
+        maxPos = contentPosRange.bottom();
+    }
+
+    if (orientation == Qt::Horizontal) {
+        // the snap points in the list
+        foreach (qreal snapPos, snapPositionsX) {
+            qreal snapPosDist = snapPos - p;
+            if ((dir > 0 && snapPosDist < 0) ||
+                (dir < 0 && snapPosDist > 0))
+                continue; // wrong direction
+            if (snapPos < minPos || snapPos > maxPos )
+                continue; // invalid
+
+            if (qIsNaN(bestSnapPos) ||
+                qAbs(snapPosDist) < bestSnapPosDist ) {
+                bestSnapPos = snapPos;
+                bestSnapPosDist = qAbs(snapPosDist);
+            }
+        }
+
+        // the snap point interval
+        if (snapIntervalX > 0.0) {
+            qreal first = minPos + snapFirstX;
+            qreal snapPos;
+            if (dir > 0)
+                snapPos = qCeil((p - first) / snapIntervalX) * snapIntervalX + first;
+            else if (dir < 0)
+                snapPos = qFloor((p - first) / snapIntervalX) * snapIntervalX + first;
+            else if (p <= first)
+                snapPos = first;
+            else
+            {
+                qreal last = qFloor((maxPos - first) / snapIntervalX) * snapIntervalX + first;
+                if (p >= last)
+                    snapPos = last;
+                else
+                    snapPos = qRound((p - first) / snapIntervalX) * snapIntervalX + first;
+            }
+
+            if (snapPos >= first && snapPos <= maxPos ) {
+                qreal snapPosDist = snapPos - p;
+
+                if (qIsNaN(bestSnapPos) ||
+                    qAbs(snapPosDist) < bestSnapPosDist ) {
+                    bestSnapPos = snapPos;
+                    bestSnapPosDist = qAbs(snapPosDist);
+                }
+            }
+        }
+
+    } else { // (orientation == Qt::Vertical)
+        // the snap points in the list
+        foreach (qreal snapPos, snapPositionsY) {
+            qreal snapPosDist = snapPos - p;
+            if ((dir > 0 && snapPosDist < 0) ||
+                (dir < 0 && snapPosDist > 0))
+                continue; // wrong direction
+            if (snapPos < minPos || snapPos > maxPos )
+                continue; // invalid
+
+            if (qIsNaN(bestSnapPos) ||
+                qAbs(snapPosDist) < bestSnapPosDist) {
+                bestSnapPos = snapPos;
+                bestSnapPosDist = qAbs(snapPosDist);
+            }
+        }
+
+        // the snap point interval
+        if (snapIntervalY > 0.0) {
+            qreal first = minPos + snapFirstY;
+            qreal snapPos;
+            if (dir > 0)
+                snapPos = qCeil((p - first) / snapIntervalY) * snapIntervalY + first;
+            else if (dir < 0)
+                snapPos = qFloor((p - first) / snapIntervalY) * snapIntervalY + first;
+            else if (p <= first)
+                snapPos = first;
+            else
+            {
+                qreal last = qFloor((maxPos - first) / snapIntervalY) * snapIntervalY + first;
+                if (p >= last)
+                    snapPos = last;
+                else
+                    snapPos = qRound((p - first) / snapIntervalY) * snapIntervalY + first;
+            }
+
+            if (snapPos >= first && snapPos <= maxPos ) {
+                qreal snapPosDist = snapPos - p;
+
+                if (qIsNaN(bestSnapPos) ||
+                    qAbs(snapPosDist) < bestSnapPosDist) {
+                    bestSnapPos = snapPos;
+                    bestSnapPosDist = qAbs(snapPosDist);
+                }
+            }
+        }
+    }
+
+    return bestSnapPos;
+}
+
+/*!
+    \enum QScroller::State
+
+    This enum contains the different QScroller states.
+
+    \value Inactive The scroller is not scrolling and nothing is pressed.
+    \value Pressed A touch event was received or the mouse button pressed but the scroll area is currently not dragged.
+    \value Dragging The scroll area is currently following the touch point or mouse.
+    \value Scrolling The scroll area is moving on it's own.
+*/
+
+/*!
+    \enum QScroller::ScrollerGestureType
+
+    This enum contains the different gesture types that are supported by the QScroller gesture recognizer.
+
+    \value TouchGesture The gesture recognizer will only trigger on touch
+    events.  Specifically it will react on single touch points when using a
+    touch screen and dual touch points when using a touchpad.
+    \value LeftMouseButtonGesture The gesture recognizer will only trigger on left mouse button events.
+    \value MiddleMouseButtonGesture The gesture recognizer will only trigger on middle mouse button events.
+    \value RightMouseButtonGesture The gesture recognizer will only trigger on right mouse button events.
+*/
+
+/*!
+    \enum QScroller::Input
+
+    This enum contains an input device agnostic view of input events that are relevant for QScroller.
+
+    \value InputPress   The user pressed the input device (e.g.  QEvent::MouseButtonPress,
+                        QEvent::GraphicsSceneMousePress, QEvent::TouchBegin)
+
+    \value InputMove    The user moved the input device (e.g.  QEvent::MouseMove,
+                        QEvent::GraphicsSceneMouseMove, QEvent::TouchUpdate)
+
+    \value InputRelease The user released the input device (e.g.  QEvent::MouseButtonRelease,
+                        QEvent::GraphicsSceneMouseRelease, QEvent::TouchEnd)
+
+*/
+
+QT_END_NAMESPACE
diff --git a/src/gui/util/qscroller.h b/src/gui/util/qscroller.h
new file mode 100644
index 0000000..34e1125
--- /dev/null
+++ b/src/gui/util/qscroller.h
@@ -0,0 +1,149 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCROLLER_H
+#define QSCROLLER_H
+
+#include <QtCore/QObject>
+#include <QtCore/QPointF>
+#include <QtGui/QScrollerProperties>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+class QWidget;
+class QScrollerPrivate;
+class QScrollerProperties;
+class QFlickGestureRecognizer;
+class QMouseFlickGestureRecognizer;
+
+class Q_GUI_EXPORT QScroller : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(State state READ state NOTIFY stateChanged)
+    Q_PROPERTY(QScrollerProperties scrollerProperties READ scrollerProperties WRITE setScrollerProperties NOTIFY scrollerPropertiesChanged)
+    Q_ENUMS(State)
+
+public:
+    enum State
+    {
+        Inactive,
+        Pressed,
+        Dragging,
+        Scrolling,
+    };
+
+    enum ScrollerGestureType
+    {
+        TouchGesture,
+        LeftMouseButtonGesture,
+        RightMouseButtonGesture,
+        MiddleMouseButtonGesture
+    };
+
+    enum Input
+    {
+        InputPress = 1,
+        InputMove,
+        InputRelease
+    };
+
+    static bool hasScroller(QObject *target);
+
+    static QScroller *scroller(QObject *target);
+    static const QScroller *scroller(const QObject *target);
+
+    static Qt::GestureType grabGesture(QObject *target, ScrollerGestureType gestureType = TouchGesture);
+    static Qt::GestureType grabbedGesture(QObject *target);
+    static void ungrabGesture(QObject *target);
+
+    static QList<QScroller *> activeScrollers();
+
+    QObject *target() const;
+
+    State state() const;
+
+    bool handleInput(Input input, const QPointF &position, qint64 timestamp = 0);
+
+    void stop();
+    QPointF velocity() const;
+    QPointF finalPosition() const;
+    QPointF pixelPerMeter() const;
+
+    QScrollerProperties scrollerProperties() const;
+
+    void setSnapPositionsX( const QList<qreal> &positions );
+    void setSnapPositionsX( qreal first, qreal interval );
+    void setSnapPositionsY( const QList<qreal> &positions );
+    void setSnapPositionsY( qreal first, qreal interval );
+
+public Q_SLOTS:
+    void setScrollerProperties(const QScrollerProperties &prop);
+    void scrollTo(const QPointF &pos);
+    void scrollTo(const QPointF &pos, int scrollTime);
+    void ensureVisible(const QRectF &rect, qreal xmargin, qreal ymargin);
+    void ensureVisible(const QRectF &rect, qreal xmargin, qreal ymargin, int scrollTime);
+    void resendPrepareEvent();
+
+Q_SIGNALS:
+    void stateChanged(QScroller::State newstate);
+    void scrollerPropertiesChanged(const QScrollerProperties &);
+
+private:
+    QScrollerPrivate *d_ptr;
+
+    QScroller(QObject *target);
+    virtual ~QScroller();
+
+    Q_DISABLE_COPY(QScroller)
+    Q_DECLARE_PRIVATE(QScroller)
+
+    friend class QFlickGestureRecognizer;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QSCROLLER_H
diff --git a/src/gui/util/qscroller_mac.mm b/src/gui/util/qscroller_mac.mm
new file mode 100644
index 0000000..3203036
--- /dev/null
+++ b/src/gui/util/qscroller_mac.mm
@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#import <Cocoa/Cocoa.h>
+
+#include "qscroller_p.h"
+
+#ifdef Q_WS_MAC
+
+QPointF QScrollerPrivate::realDpi(int screen)
+{
+    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+    NSArray *nsscreens = [NSScreen screens];
+
+    if (screen < 0 || screen >= int([nsscreens count]))
+        screen = 0;
+
+    NSScreen *nsscreen = [nsscreens objectAtIndex:screen];
+    CGDirectDisplayID display = [[[nsscreen deviceDescription] objectForKey:@"NSScreenNumber"] intValue];
+
+    CGSize mmsize = CGDisplayScreenSize(display);
+    if (mmsize.width > 0 && mmsize.height > 0) {
+        return QPointF(CGDisplayPixelsWide(display) / mmsize.width,
+                       CGDisplayPixelsHigh(display) / mmsize.height) * qreal(25.4);
+    } else {
+        return QPointF();
+    }
+    [pool release];
+}
+
+#endif
diff --git a/src/gui/util/qscroller_p.h b/src/gui/util/qscroller_p.h
new file mode 100644
index 0000000..98f34f7
--- /dev/null
+++ b/src/gui/util/qscroller_p.h
@@ -0,0 +1,205 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCROLLER_P_H
+#define QSCROLLER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QObject>
+#include <QPointer>
+#include <QQueue>
+#include <QSet>
+#include <QEasingCurve>
+#include <QElapsedTimer>
+#include <QSizeF>
+#include <QPointF>
+#include <QRectF>
+#include <qscroller.h>
+#include <qscrollerproperties.h>
+#include <private/qscrollerproperties_p.h>
+#include <QAbstractAnimation>
+
+QT_BEGIN_NAMESPACE
+
+class QFlickGestureRecognizer;
+
+class QScrollTimer;
+
+class QScrollerPrivate : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PUBLIC(QScroller)
+
+public:
+    QScrollerPrivate(QScroller *q, QObject *target);
+    void init();
+
+    void sendEvent(QObject *o, QEvent *e);
+
+    void setState(QScroller::State s);
+
+    enum ScrollType {
+        ScrollTypeFlick = 0,
+        ScrollTypeScrollTo,
+        ScrollTypeOvershoot
+    };
+
+    struct ScrollSegment {
+        qint64 startTime;
+        qint64 deltaTime;
+        qreal startPos;
+        qreal deltaPos;
+        QEasingCurve curve;
+        qreal maxProgress;
+        ScrollType type;
+    };
+
+    bool pressWhileInactive(const QPointF &position, qint64 timestamp);
+    bool moveWhilePressed(const QPointF &position, qint64 timestamp);
+    bool releaseWhilePressed(const QPointF &position, qint64 timestamp);
+    bool moveWhileDragging(const QPointF &position, qint64 timestamp);
+    bool releaseWhileDragging(const QPointF &position, qint64 timestamp);
+    bool pressWhileScrolling(const QPointF &position, qint64 timestamp);
+
+    void timerTick();
+    void timerEventWhileDragging();
+    void timerEventWhileScrolling();
+
+    bool prepareScrolling(const QPointF &position);
+    void handleDrag(const QPointF &position, qint64 timestamp);
+
+    QPointF realDpi(int screen);
+    QPointF dpi() const;
+    void setDpi(const QPointF &dpi);
+    void setDpiFromWidget(QWidget *widget);
+
+    void updateVelocity(const QPointF &deltaPixelRaw, qint64 deltaTime);
+    void pushSegment(ScrollType type, qreal deltaTime, qreal startPos, qreal endPos, QEasingCurve::Type curve, Qt::Orientation orientation, qreal maxProgress = 1.0);
+    void recalcScrollingSegments(bool forceRecalc = false);
+    qreal scrollingSegmentsEndPos(Qt::Orientation orientation) const;
+    bool scrollingSegmentsValid(Qt::Orientation orientation);
+    void createScrollToSegments(qreal v, qreal deltaTime, qreal endPos, Qt::Orientation orientation, ScrollType type);
+    void createScrollingSegments(qreal v, qreal startPos, qreal ppm, Qt::Orientation orientation);
+
+    void setContentPositionHelperDragging(const QPointF &deltaPos);
+    void setContentPositionHelperScrolling();
+
+    qreal nextSnapPos(qreal p, int dir, Qt::Orientation orientation);
+    static qreal nextSegmentPosition(QQueue<ScrollSegment> &segments, qint64 now, qreal oldPos);
+
+    inline int frameRateSkip() const { return properties.d.data()->frameRate; }
+
+    static const char *stateName(QScroller::State state);
+    static const char *inputName(QScroller::Input input);
+
+public slots:
+    void targetDestroyed();
+
+public:
+    // static
+    static QMap<QObject *, QScroller *> allScrollers;
+    static QSet<QScroller *> activeScrollers;
+
+    // non static
+    QObject *target;
+    QScrollerProperties properties;
+    QFlickGestureRecognizer *recognizer;
+    Qt::GestureType recognizerType;
+
+    // scroller state:
+
+    // QPointer<QObject> scrollTarget;
+    QSizeF viewportSize;
+    QRectF contentPosRange;
+    QPointF contentPosition;
+    QPointF overshootPosition; // the number of pixels we are overshooting (before overshootDragResistanceFactor)
+
+    // state
+
+    bool enabled;
+    QScroller::State state;
+    bool firstScroll; // true if we haven't already send a scroll event
+
+    QPointF oldVelocity; // the release velocity of the last drag
+
+    QPointF pressPosition;
+    QPointF lastPosition;
+    qint64  pressTimestamp;
+    qint64  lastTimestamp;
+
+    QPointF dragDistance; // the distance we should move during the next drag timer event
+
+    QQueue<ScrollSegment> xSegments;
+    QQueue<ScrollSegment> ySegments;
+
+    // snap positions
+    QList<qreal> snapPositionsX;
+    qreal snapFirstX;
+    qreal snapIntervalX;
+    QList<qreal> snapPositionsY;
+    qreal snapFirstY;
+    qreal snapIntervalY;
+
+    QPointF pixelPerMeter;
+
+    QElapsedTimer monotonicTimer;
+
+    QPointF releaseVelocity; // the starting velocity of the scrolling state
+    QScrollTimer *scrollTimer;
+
+    QScroller *q_ptr;
+};
+
+
+QT_END_NAMESPACE
+
+#endif // QSCROLLER_P_H
+
diff --git a/src/gui/util/qscrollerproperties.cpp b/src/gui/util/qscrollerproperties.cpp
new file mode 100644
index 0000000..4fba489
--- /dev/null
+++ b/src/gui/util/qscrollerproperties.cpp
@@ -0,0 +1,418 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 <QPointer>
+#include <QObject>
+#include <QtCore/qmath.h>
+#ifdef Q_WS_WIN
+#  include <QLibrary>
+#endif
+
+#include "qscrollerproperties.h"
+#include "private/qscrollerproperties_p.h"
+
+QT_BEGIN_NAMESPACE
+
+static QScrollerPropertiesPrivate *userDefaults = 0;
+static QScrollerPropertiesPrivate *systemDefaults = 0;
+
+QScrollerPropertiesPrivate *QScrollerPropertiesPrivate::defaults()
+{
+    if (!systemDefaults) {
+        QScrollerPropertiesPrivate spp;
+#ifdef Q_WS_MAEMO_5
+        spp.mousePressEventDelay = qreal(0);
+        spp.dragStartDistance = qreal(2.5 / 1000);
+        spp.dragVelocitySmoothingFactor = qreal(0.15);
+        spp.axisLockThreshold = qreal(0);
+        spp.scrollingCurve.setType(QEasingCurve::OutQuad);
+        spp.decelerationFactor = 1.0;
+        spp.minimumVelocity = qreal(0.0195);
+        spp.maximumVelocity = qreal(6.84);
+        spp.maximumClickThroughVelocity = qreal(0.0684);
+        spp.acceleratingFlickMaximumTime = qreal(0.125);
+        spp.acceleratingFlickSpeedupFactor = qreal(3.0);
+        spp.snapPositionRatio = qreal(0.25);
+        spp.snapTime = qreal(1);
+        spp.overshootDragResistanceFactor = qreal(1);
+        spp.overshootDragDistanceFactor = qreal(0.3);
+        spp.overshootScrollDistanceFactor = qreal(0.3);
+        spp.overshootScrollTime = qreal(0.5);
+        spp.hOvershootPolicy = QScrollerProperties::OvershootWhenScrollable;
+        spp.vOvershootPolicy = QScrollerProperties::OvershootWhenScrollable;
+        spp.frameRate = QScrollerProperties::Fps30;
+#else
+        spp.mousePressEventDelay = qreal(0.25);
+        spp.dragStartDistance = qreal(5.0 / 1000);
+        spp.dragVelocitySmoothingFactor = qreal(0.02);
+        spp.axisLockThreshold = qreal(0);
+        spp.scrollingCurve.setType(QEasingCurve::OutQuad);
+        spp.decelerationFactor = qreal(0.125);
+        spp.minimumVelocity = qreal(50.0 / 1000);
+        spp.maximumVelocity = qreal(500.0 / 1000);
+        spp.maximumClickThroughVelocity = qreal(66.5 / 1000);
+        spp.acceleratingFlickMaximumTime = qreal(1.25);
+        spp.acceleratingFlickSpeedupFactor = qreal(3.0);
+        spp.snapPositionRatio = qreal(0.5);
+        spp.snapTime = qreal(0.3);
+        spp.overshootDragResistanceFactor = qreal(0.5);
+        spp.overshootDragDistanceFactor = qreal(1);
+        spp.overshootScrollDistanceFactor = qreal(0.5);
+        spp.overshootScrollTime = qreal(0.7);
+#  ifdef Q_WS_WIN
+        if (QLibrary::resolve(QLatin1String("UxTheme"), "BeginPanningFeedback"))
+            spp.overshootScrollTime = qreal(0.35);
+#  endif
+        spp.hOvershootPolicy = QScrollerProperties::OvershootWhenScrollable;
+        spp.vOvershootPolicy = QScrollerProperties::OvershootWhenScrollable;
+        spp.frameRate = QScrollerProperties::Standard;
+#endif
+        systemDefaults = new QScrollerPropertiesPrivate(spp);
+    }
+    return new QScrollerPropertiesPrivate(userDefaults ? *userDefaults : *systemDefaults);
+}
+
+/*!
+    \class QScrollerProperties
+    \brief The QScrollerProperties class stores the settings for a QScroller.
+    \since 4.8
+
+    The QScrollerProperties class stores the parameters used by QScroller.
+
+    The default settings are platform dependant and Qt will emulate the
+    platform behaviour for kinetic scrolling.
+
+    As a convention the QScrollerProperties are in physical units (meter,
+    seconds) and will be converted by QScroller using the current DPI.
+
+    \sa QScroller
+*/
+
+/*!
+    Constructs new scroller properties.
+*/
+QScrollerProperties::QScrollerProperties()
+    : d(QScrollerPropertiesPrivate::defaults())
+{
+}
+
+/*!
+    Constructs a copy of \a sp.
+*/
+QScrollerProperties::QScrollerProperties(const QScrollerProperties &sp)
+    : d(new QScrollerPropertiesPrivate(*sp.d))
+{
+}
+
+/*!
+    Assigns \a sp to these scroller properties and returns a reference to these scroller properties.
+*/
+QScrollerProperties &QScrollerProperties::operator=(const QScrollerProperties &sp)
+{
+    *d.data() = *sp.d.data();
+    return *this;
+}
+
+/*!
+    Destroys the scroller properties.
+*/
+QScrollerProperties::~QScrollerProperties()
+{
+}
+
+/*!
+    Returns true if these scroller properties are equal to \a sp; otherwise returns false.
+*/
+bool QScrollerProperties::operator==(const QScrollerProperties &sp) const
+{
+    return *d.data() == *sp.d.data();
+}
+
+/*!
+    Returns true if these scroller properties are different from \a sp; otherwise returns false.
+*/
+bool QScrollerProperties::operator!=(const QScrollerProperties &sp) const
+{
+    return !(*d.data() == *sp.d.data());
+}
+
+bool QScrollerPropertiesPrivate::operator==(const QScrollerPropertiesPrivate &p) const
+{
+    bool same = true;
+    same &= (mousePressEventDelay == p.mousePressEventDelay);
+    same &= (dragStartDistance == p.dragStartDistance);
+    same &= (dragVelocitySmoothingFactor == p.dragVelocitySmoothingFactor);
+    same &= (axisLockThreshold == p.axisLockThreshold);
+    same &= (scrollingCurve == p.scrollingCurve);
+    same &= (decelerationFactor == p.decelerationFactor);
+    same &= (minimumVelocity == p.minimumVelocity);
+    same &= (maximumVelocity == p.maximumVelocity);
+    same &= (maximumClickThroughVelocity == p.maximumClickThroughVelocity);
+    same &= (acceleratingFlickMaximumTime == p.acceleratingFlickMaximumTime);
+    same &= (acceleratingFlickSpeedupFactor == p.acceleratingFlickSpeedupFactor);
+    same &= (snapPositionRatio == p.snapPositionRatio);
+    same &= (snapTime == p.snapTime);
+    same &= (overshootDragResistanceFactor == p.overshootDragResistanceFactor);
+    same &= (overshootDragDistanceFactor == p.overshootDragDistanceFactor);
+    same &= (overshootScrollDistanceFactor == p.overshootScrollDistanceFactor);
+    same &= (overshootScrollTime == p.overshootScrollTime);
+    same &= (hOvershootPolicy == p.hOvershootPolicy);
+    same &= (vOvershootPolicy == p.vOvershootPolicy);
+    same &= (frameRate == p.frameRate);
+    return same;
+}
+
+/*!
+     Sets the scroller properties returned by the default constructor to \a sp.
+
+     Use this function to override the platform default properties returned by the default
+     constructor. If you only want to change the scroller properties of a single scroller, then use
+     QScroller::setScrollerProperties()
+
+     \note Calling this function will not change the content of already existing
+     QScrollerProperties objects.
+
+     \sa unsetDefaultScrollerProperties()
+*/
+void QScrollerProperties::setDefaultScrollerProperties(const QScrollerProperties &sp)
+{
+    if (!userDefaults)
+        userDefaults = new QScrollerPropertiesPrivate(*sp.d);
+    else
+        *userDefaults = *sp.d;
+}
+
+/*!
+     Sets the scroller properties returned by the default constructor back to the platform default
+     properties.
+
+     \sa setDefaultScrollerProperties()
+*/
+void QScrollerProperties::unsetDefaultScrollerProperties()
+{
+    delete userDefaults;
+    userDefaults = 0;
+}
+
+/*!
+    Query the \a metric value of the scroller properties.
+
+    \sa setScrollMetric(), ScrollMetric
+*/
+QVariant QScrollerProperties::scrollMetric(ScrollMetric metric) const
+{
+    switch (metric) {
+    case MousePressEventDelay:          return d->mousePressEventDelay;
+    case DragStartDistance:             return d->dragStartDistance;
+    case DragVelocitySmoothingFactor:   return d->dragVelocitySmoothingFactor;
+    case AxisLockThreshold:             return d->axisLockThreshold;
+    case ScrollingCurve:                return d->scrollingCurve;
+    case DecelerationFactor:            return d->decelerationFactor;
+    case MinimumVelocity:               return d->minimumVelocity;
+    case MaximumVelocity:               return d->maximumVelocity;
+    case MaximumClickThroughVelocity:   return d->maximumClickThroughVelocity;
+    case AcceleratingFlickMaximumTime:  return d->acceleratingFlickMaximumTime;
+    case AcceleratingFlickSpeedupFactor:return d->acceleratingFlickSpeedupFactor;
+    case SnapPositionRatio:             return d->snapPositionRatio;
+    case SnapTime:                      return d->snapTime;
+    case OvershootDragResistanceFactor: return d->overshootDragResistanceFactor;
+    case OvershootDragDistanceFactor:   return d->overshootDragDistanceFactor;
+    case OvershootScrollDistanceFactor: return d->overshootScrollDistanceFactor;
+    case OvershootScrollTime:           return d->overshootScrollTime;
+    case HorizontalOvershootPolicy:     return QVariant::fromValue(d->hOvershootPolicy);
+    case VerticalOvershootPolicy:       return QVariant::fromValue(d->vOvershootPolicy);
+    case FrameRate:                     return QVariant::fromValue(d->frameRate);
+    case ScrollMetricCount:             break;
+    }
+    return QVariant();   
+}
+
+/*!
+    Set a specific value of the \a metric ScrollerMetric to \a value.
+
+    \sa scrollMetric(), ScrollMetric
+*/
+void QScrollerProperties::setScrollMetric(ScrollMetric metric, const QVariant &value)
+{
+    switch (metric) {
+    case MousePressEventDelay:          d->mousePressEventDelay = value.toReal(); break;
+    case DragStartDistance:             d->dragStartDistance = value.toReal(); break;
+    case DragVelocitySmoothingFactor:   d->dragVelocitySmoothingFactor = qBound(qreal(0), value.toReal(), qreal(1)); break;
+    case AxisLockThreshold:             d->axisLockThreshold = qBound(qreal(0), value.toReal(), qreal(1)); break;
+    case ScrollingCurve:                d->scrollingCurve = value.toEasingCurve(); break;
+    case DecelerationFactor:            d->decelerationFactor = value.toReal(); break;
+    case MinimumVelocity:               d->minimumVelocity = value.toReal(); break;
+    case MaximumVelocity:               d->maximumVelocity = value.toReal(); break;
+    case MaximumClickThroughVelocity:   d->maximumClickThroughVelocity = value.toReal(); break;
+    case AcceleratingFlickMaximumTime:  d->acceleratingFlickMaximumTime = value.toReal(); break;
+    case AcceleratingFlickSpeedupFactor:d->acceleratingFlickSpeedupFactor = value.toReal(); break;
+    case SnapPositionRatio:             d->snapPositionRatio = qBound(qreal(0), value.toReal(), qreal(1)); break;
+    case SnapTime:                      d->snapTime = value.toReal(); break;
+    case OvershootDragResistanceFactor: d->overshootDragResistanceFactor = value.toReal(); break;
+    case OvershootDragDistanceFactor:   d->overshootDragDistanceFactor = qBound(qreal(0), value.toReal(), qreal(1)); break;
+    case OvershootScrollDistanceFactor: d->overshootScrollDistanceFactor = qBound(qreal(0), value.toReal(), qreal(1)); break;
+    case OvershootScrollTime:           d->overshootScrollTime = value.toReal(); break;
+    case HorizontalOvershootPolicy:     d->hOvershootPolicy = value.value<QScrollerProperties::OvershootPolicy>(); break;
+    case VerticalOvershootPolicy:       d->vOvershootPolicy = value.value<QScrollerProperties::OvershootPolicy>(); break;
+    case FrameRate:                     d->frameRate = value.value<QScrollerProperties::FrameRates>(); break;
+    case ScrollMetricCount:             break;
+    }
+}
+
+/*!
+    \enum QScrollerProperties::FrameRates
+
+    This enum describes the available frame rates used while dragging or scrolling.
+
+    \value Fps60 60 frames per second
+    \value Fps30 30 frames per second
+    \value Fps20 20 frames per second
+    \value Standard the default value is 60 frames per second (which corresponds to QAbstractAnimation).
+*/
+
+/*!
+    \enum QScrollerProperties::OvershootPolicy
+
+    This enum describes the various modes of overshooting.
+
+    \value OvershootWhenScrollable Overshooting is when the content is scrollable. This is the
+                                   default.
+
+    \value OvershootAlwaysOff Overshooting is never enabled (even when the content is scrollable).
+
+    \value OvershootAlwaysOn Overshooting is always enabled (even when the content is not
+                             scrollable).
+*/
+
+/*!
+    \enum QScrollerProperties::ScrollMetric
+
+    This enum contains the different scroll metric types. When not indicated otherwise the
+    setScrollMetric function expects a QVariant of a real value.
+
+    See the QScroller documentation for a further explanation of the concepts behind the different
+    values.
+
+    \value MousePressEventDelay This is the time a mouse press event will be delayed when starting
+    a flick gesture in \c{[s]}. If the gesture is triggered within that time, no mouse press or
+    release will be sent to the scrolled object. If it triggers after that delay the (delayed)
+    mouse press plus a faked release event (at global postion \c{QPoint(-QWIDGETSIZE_MAX,
+    -QWIDGETSIZE_MAX)} will be sent. If the gesture is canceled, then both the (delayed) mouse
+    press plus the real release event will be delivered.
+
+    \value DragStartDistance This is the minimum distance the touch or mouse point needs to be
+    moved before the flick gesture is triggered in \c m.
+
+    \value DragVelocitySmoothingFactor A value that describes how much new drag velocities are
+    included in the final scrolling velocity. This value should be in the range between \c 0 and \c
+    1. Low values meaning that the last dragging velocity is not very important.
+
+    \value AxisLockThreshold If greater than zero a scroll movement will be restricted to one axis
+    only if the movement is inside an angle about the axis. The threshold must be in the range \c 0
+    to \c 1.
+
+    \value ScrollingCurve The QEasingCurve used when decelerating the scrolling velocity after an
+    user initiated flick. Please note that this is the easing curve for the positions, \bold{not}
+    the velocity: the default is QEasingCurve::OutQuad, which results is a linear decrease in
+    velocity (1st derivative) and a constant deceleration (2nd derivative).
+
+    \value DecelerationFactor This factor influences how long it takes the scroller to decelerate
+    to 0 velocity. The actual value heavily depends on the chosen ScrollingCurve, but for most
+    types the value should be in the range from \c 0.1 to \c 2.0
+
+    \value MinimumVelocity The minimum velocity that is needed after ending the touch or releasing
+    the mouse to start scrolling in \c{m/s}.
+
+    \value MaximumVelocity This is the maximum velocity that can be reached in \c{m/s}.
+
+    \value MaximumClickThroughVelocity This is the maximum allowed scroll speed for a click-through
+    in \c{m/s}. This means that a click on a currently (slowly) scrolling object will not only stop
+    the scrolling but the click event will also be delivered to the UI control - this is very
+    useful when using exponential-type scrolling curves.
+
+    \value AcceleratingFlickMaximumTime This is the maximum time in \c seconds that a flick gesture
+    can take to be recognized as an accelerating flick. If set to zero no such gesture will be
+    detected. An "accelerating flick" is a flick gesture executed on an already scrolling object.
+    In such cases the scrolling speed is multiplied by AcceleratingFlickSpeedupFactor in order to
+    accelerate it.
+
+    \value AcceleratingFlickSpeedupFactor The current speed will be multiplied by this number if an
+    accelerating flick is detected. Should be \c{> 1}.
+
+    \value SnapPositionRatio This is the distance that the user must drag the area beween two snap
+    points in order to snap it to the next position. e.g. \c{0.33} means that the scroll must only
+    reach one third of the distance between two snap points to snap to the next one. The ratio must
+    be in the range \c 0 to \c 1.
+
+    \value SnapTime This is the time factor for the scrolling curve. A lower value means that the
+    scrolling will take longer. The scrolling distance is independet of this value.
+
+    \value OvershootDragResistanceFactor This value is the factor between the mouse dragging and
+    the actual scroll area movement (during overshoot). The factor must be in the range \c 0 to \c
+    1.
+
+    \value OvershootDragDistanceFactor This is the maximum distance for overshoot movements while
+    dragging. The actual overshoot distance will be calculated by multiplying this value with the
+    viewport size of the scrolled object. The factor must be in the range \c 0 to \c 1.
+
+    \value OvershootScrollDistanceFactor This is the maximum distance for overshoot movements while
+    scrolling. The actual overshoot distance will be calculated by multiplying this value with the
+    viewport size of the scrolled object. The factor must be in the range \c 0 to \c 1.
+
+    \value OvershootScrollTime This is the time in \c seconds that will be used to play the
+    complete overshoot animation.
+
+    \value HorizontalOvershootPolicy This is the horizontal overshooting policy (see OvershootPolicy).
+
+    \value VerticalOvershootPolicy This is the horizontal overshooting policy (see OvershootPolicy).
+
+    \value FrameRate This is the frame rate which should be used while dragging or scrolling. 
+    QScroller uses a QAbstractAnimation timer internally to sync all scrolling operations to other
+    animations that might be active at the same time.  If the Standard value of 60 frames per
+    second is too fast for your use case, you can lower the frames per second with this setting
+    (while still being in-sync with QAbstractAnimation).  Please note that only the values of the
+    FrameRates enum are allowed here.
+
+    \value ScrollMetricCount This is just used when enumerating the metrics. It is always the last
+    entry.
+*/
+
+QT_END_NAMESPACE
diff --git a/src/gui/util/qscrollerproperties.h b/src/gui/util/qscrollerproperties.h
new file mode 100644
index 0000000..5284876
--- /dev/null
+++ b/src/gui/util/qscrollerproperties.h
@@ -0,0 +1,140 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCROLLERPROPERTIES_H
+#define QSCROLLERPROPERTIES_H
+
+#include <QtCore/QScopedPointer>
+#include <QtCore/QMetaType>
+#include <QtCore/QVariant>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+class QScroller;
+class QScrollerPrivate;
+class QScrollerPropertiesPrivate;
+
+class Q_GUI_EXPORT QScrollerProperties
+{
+public:
+    QScrollerProperties();
+    QScrollerProperties(const QScrollerProperties &sp);
+    QScrollerProperties &operator=(const QScrollerProperties &sp);
+    virtual ~QScrollerProperties();
+
+    bool operator==(const QScrollerProperties &sp) const;
+    bool operator!=(const QScrollerProperties &sp) const;
+
+    static void setDefaultScrollerProperties(const QScrollerProperties &sp);
+    static void unsetDefaultScrollerProperties();
+
+    enum OvershootPolicy
+    {
+        OvershootWhenScrollable,
+        OvershootAlwaysOff,
+        OvershootAlwaysOn
+    };
+
+    enum FrameRates {
+        Standard,
+        Fps60,
+        Fps30,
+        Fps20
+    };
+
+    enum ScrollMetric
+    {
+        MousePressEventDelay,                    // qreal [s]
+        DragStartDistance,                       // qreal [m]
+        DragVelocitySmoothingFactor,             // qreal [0..1/s]  (complex calculation involving time) v = v_new* DASF + v_old * (1-DASF)
+        AxisLockThreshold,                       // qreal [0..1] atan(|min(dx,dy)|/|max(dx,dy)|)
+
+        ScrollingCurve,                          // QEasingCurve
+        DecelerationFactor,                      // slope of the curve
+
+        MinimumVelocity,                         // qreal [m/s]
+        MaximumVelocity,                         // qreal [m/s]
+        MaximumClickThroughVelocity,             // qreal [m/s]
+
+        AcceleratingFlickMaximumTime,            // qreal [s]
+        AcceleratingFlickSpeedupFactor,          // qreal [1..]
+
+        SnapPositionRatio,                       // qreal [0..1]
+        SnapTime,                                // qreal [s]
+
+        OvershootDragResistanceFactor,           // qreal [0..1]
+        OvershootDragDistanceFactor,             // qreal [0..1]
+        OvershootScrollDistanceFactor,           // qreal [0..1]
+        OvershootScrollTime,                     // qreal [s]
+
+        HorizontalOvershootPolicy,               // enum OvershootPolicy
+        VerticalOvershootPolicy,                 // enum OvershootPolicy
+        FrameRate,                               // enum FrameRates
+
+        ScrollMetricCount
+    };
+
+    QVariant scrollMetric(ScrollMetric metric) const;
+    void setScrollMetric(ScrollMetric metric, const QVariant &value);
+
+protected:
+    QScopedPointer<QScrollerPropertiesPrivate> d;
+
+private:
+    QScrollerProperties(QScrollerPropertiesPrivate &dd);
+
+    friend class QScrollerPropertiesPrivate;
+    friend class QScroller;
+    friend class QScrollerPrivate;
+};
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QScrollerProperties::OvershootPolicy);
+Q_DECLARE_METATYPE(QScrollerProperties::FrameRates);
+
+QT_END_HEADER
+
+#endif // QSCROLLERPROPERTIES_H
diff --git a/src/gui/util/qscrollerproperties_p.h b/src/gui/util/qscrollerproperties_p.h
new file mode 100644
index 0000000..093f615
--- /dev/null
+++ b/src/gui/util/qscrollerproperties_p.h
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCROLLERPROPERTIES_P_H
+#define QSCROLLERPROPERTIES_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QPointF>
+#include <QEasingCurve>
+#include <qscrollerproperties.h>
+
+QT_BEGIN_NAMESPACE
+
+class QScrollerPropertiesPrivate
+{
+public:
+    static QScrollerPropertiesPrivate *defaults();
+
+    bool operator==(const QScrollerPropertiesPrivate &) const;
+
+    qreal mousePressEventDelay;
+    qreal dragStartDistance;
+    qreal dragVelocitySmoothingFactor;
+    qreal axisLockThreshold;
+    QEasingCurve scrollingCurve;
+    qreal decelerationFactor;
+    qreal minimumVelocity;
+    qreal maximumVelocity;
+    qreal maximumClickThroughVelocity;
+    qreal acceleratingFlickMaximumTime;
+    qreal acceleratingFlickSpeedupFactor;
+    qreal snapPositionRatio;
+    qreal snapTime;
+    qreal overshootDragResistanceFactor;
+    qreal overshootDragDistanceFactor;
+    qreal overshootScrollDistanceFactor;
+    qreal overshootScrollTime;
+    QScrollerProperties::OvershootPolicy hOvershootPolicy;
+    QScrollerProperties::OvershootPolicy vOvershootPolicy;
+    QScrollerProperties::FrameRates frameRate;
+};
+
+QT_END_NAMESPACE
+
+#endif // QSCROLLERPROPERTIES_P_H
+
diff --git a/src/gui/util/util.pri b/src/gui/util/util.pri
index f125f82..2814a2d 100644
--- a/src/gui/util/util.pri
+++ b/src/gui/util/util.pri
@@ -6,6 +6,11 @@ HEADERS += \
         util/qcompleter_p.h \
         util/qdesktopservices.h \
         util/qsystemtrayicon_p.h \
+        util/qscroller.h \
+        util/qscroller_p.h \
+        util/qscrollerproperties.h \
+        util/qscrollerproperties_p.h \
+        util/qflickgesture_p.h \
         util/qundogroup.h \
         util/qundostack.h \
         util/qundostack_p.h \
@@ -15,6 +20,9 @@ SOURCES += \
         util/qsystemtrayicon.cpp \
         util/qcompleter.cpp \
         util/qdesktopservices.cpp \
+        util/qscroller.cpp \
+        util/qscrollerproperties.cpp \
+        util/qflickgesture.cpp \
         util/qundogroup.cpp \
         util/qundostack.cpp \
         util/qundoview.cpp
@@ -57,3 +65,7 @@ symbian {
         DEFINES += USE_SCHEMEHANDLER
     }
 }
+
+macx {
+    OBJECTIVE_SOURCES += util/qscroller_mac.mm
+}