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diff --git a/src/corelib/animation/qvariantanimation.cpp b/src/corelib/animation/qvariantanimation.cpp
new file mode 100644
index 0000000000..c76cb89ff9
--- /dev/null
+++ b/src/corelib/animation/qvariantanimation.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore 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 "qvariantanimation.h"
+#include "qvariantanimation_p.h"
+
+#include <QtCore/qrect.h>
+#include <QtCore/qline.h>
+#include <QtCore/qmutex.h>
+#include <private/qmutexpool_p.h>
+
+#ifndef QT_NO_ANIMATION
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QVariantAnimation
+    \ingroup animation
+    \brief The QVariantAnimation class provides an abstract base class for animations.
+    \since 4.6
+
+    This class is part of \l{The Animation Framework}. It serves as a
+    base class for property and item animations, with functions for
+    shared functionality.
+
+    QVariantAnimation cannot be used directly as it is an abstract
+    class; it has a pure virtual method called updateCurrentValue().
+    The class performs interpolation over
+    \l{QVariant}s, but leaves using the interpolated values to its
+    subclasses. Currently, Qt provides QPropertyAnimation, which
+    animates Qt \l{Qt's Property System}{properties}. See the
+    QPropertyAnimation class description if you wish to animate such
+    properties.
+
+    You can then set start and end values for the property by calling
+    setStartValue() and setEndValue(), and finally call start() to
+    start the animation. QVariantAnimation will interpolate the
+    property of the target object and emit valueChanged(). To react to
+    a change in the current value you have to reimplement the
+    updateCurrentValue() virtual function.
+
+    It is also possible to set values at specified steps situated
+    between the start and end value. The interpolation will then
+    touch these points at the specified steps. Note that the start and
+    end values are defined as the key values at 0.0 and 1.0.
+
+    There are two ways to affect how QVariantAnimation interpolates
+    the values. You can set an easing curve by calling
+    setEasingCurve(), and configure the duration by calling
+    setDuration(). You can change how the QVariants are interpolated
+    by creating a subclass of QVariantAnimation, and reimplementing
+    the virtual interpolated() function.
+
+    Subclassing QVariantAnimation can be an alternative if you have
+    \l{QVariant}s that you do not wish to declare as Qt properties.
+    Note, however, that you in most cases will be better off declaring
+    your QVariant as a property.
+
+    Not all QVariant types are supported. Below is a list of currently
+    supported QVariant types:
+
+    \list
+        \o \l{QMetaType::}{Int}
+        \o \l{QMetaType::}{Double}
+        \o \l{QMetaType::}{Float}
+        \o \l{QMetaType::}{QLine}
+        \o \l{QMetaType::}{QLineF}
+        \o \l{QMetaType::}{QPoint}
+        \o \l{QMetaType::}{QPointF}
+        \o \l{QMetaType::}{QSize}
+        \o \l{QMetaType::}{QSizeF}
+        \o \l{QMetaType::}{QRect}
+        \o \l{QMetaType::}{QRectF}
+        \o \l{QMetaType::}{QColor}
+    \endlist
+
+    If you need to interpolate other variant types, including custom
+    types, you have to implement interpolation for these yourself.
+    To do this, you can register an interpolator function for a given
+    type. This function takes 3 parameters: the start value, the end value
+    and the current progress.
+
+    Example:
+    \code
+        QVariant myColorInterpolator(const QColor &start, const QColor &end, qreal progress)
+        {
+            ...
+            return QColor(...);
+        }
+        ...
+        qRegisterAnimationInterpolator<QColor>(myColorInterpolator);
+    \endcode
+
+    Another option is to reimplement interpolated(), which returns
+    interpolation values for the value being interpolated.
+
+    \omit We need some snippets around here. \endomit
+
+    \sa QPropertyAnimation, QAbstractAnimation, {The Animation Framework}
+*/
+
+/*!
+    \fn void QVariantAnimation::valueChanged(const QVariant &value)
+
+    QVariantAnimation emits this signal whenever the current \a value changes.
+
+    \sa currentValue, startValue, endValue
+*/
+
+/*!
+    \fn void QVariantAnimation::updateCurrentValue(const QVariant &value) = 0;
+
+    This pure virtual function is called every time the animation's current
+    value changes. The \a value argument is the new current value.
+
+    \sa currentValue
+*/
+
+static bool animationValueLessThan(const QVariantAnimation::KeyValue &p1, const QVariantAnimation::KeyValue &p2)
+{
+    return p1.first < p2.first;
+}
+
+static QVariant defaultInterpolator(const void *, const void *, qreal)
+{
+    return QVariant();
+}
+
+template<> Q_INLINE_TEMPLATE QRect _q_interpolate(const QRect &f, const QRect &t, qreal progress)
+{
+    QRect ret;
+    ret.setCoords(_q_interpolate(f.left(), t.left(), progress),
+                  _q_interpolate(f.top(), t.top(), progress),
+                  _q_interpolate(f.right(), t.right(), progress),
+                  _q_interpolate(f.bottom(), t.bottom(), progress));
+    return ret;
+}
+
+template<> Q_INLINE_TEMPLATE QRectF _q_interpolate(const QRectF &f, const QRectF &t, qreal progress)
+{
+    qreal x1, y1, w1, h1;
+    f.getRect(&x1, &y1, &w1, &h1);
+    qreal x2, y2, w2, h2;
+    t.getRect(&x2, &y2, &w2, &h2);
+    return QRectF(_q_interpolate(x1, x2, progress), _q_interpolate(y1, y2, progress),
+                  _q_interpolate(w1, w2, progress), _q_interpolate(h1, h2, progress));
+}
+
+template<> Q_INLINE_TEMPLATE QLine _q_interpolate(const QLine &f, const QLine &t, qreal progress)
+{
+    return QLine( _q_interpolate(f.p1(), t.p1(), progress), _q_interpolate(f.p2(), t.p2(), progress));
+}
+
+template<> Q_INLINE_TEMPLATE QLineF _q_interpolate(const QLineF &f, const QLineF &t, qreal progress)
+{
+    return QLineF( _q_interpolate(f.p1(), t.p1(), progress), _q_interpolate(f.p2(), t.p2(), progress));
+}
+
+QVariantAnimationPrivate::QVariantAnimationPrivate() : duration(250), interpolator(&defaultInterpolator)
+{ }
+
+void QVariantAnimationPrivate::convertValues(int t)
+{
+    //this ensures that all the keyValues are of type t
+    for (int i = 0; i < keyValues.count(); ++i) {
+        QVariantAnimation::KeyValue &pair = keyValues[i];
+        pair.second.convert(static_cast<QVariant::Type>(t));
+    }
+    //we also need update to the current interval if needed
+    currentInterval.start.second.convert(static_cast<QVariant::Type>(t));
+    currentInterval.end.second.convert(static_cast<QVariant::Type>(t));
+
+    //... and the interpolator
+    updateInterpolator();
+}
+
+void QVariantAnimationPrivate::updateInterpolator()
+{
+    int type = currentInterval.start.second.userType();
+    if (type == currentInterval.end.second.userType())
+        interpolator = getInterpolator(type);
+    else
+        interpolator = 0;
+    
+    //we make sure that the interpolator is always set to something
+    if (!interpolator)
+        interpolator = &defaultInterpolator;
+}
+
+/*!
+    \internal
+    The goal of this function is to update the currentInterval member. As a consequence, we also
+    need to update the currentValue.
+    Set \a force to true to always recalculate the interval.
+*/
+void QVariantAnimationPrivate::recalculateCurrentInterval(bool force/*=false*/)
+{
+    // can't interpolate if we don't have at least 2 values
+    if ((keyValues.count() + (defaultStartEndValue.isValid() ? 1 : 0)) < 2)
+        return;
+
+    const qreal progress = easing.valueForProgress(((duration == 0) ? qreal(1) : qreal(currentTime) / qreal(duration)));
+
+    //0 and 1 are still the boundaries
+    if (force || (currentInterval.start.first > 0 && progress < currentInterval.start.first)
+        || (currentInterval.end.first < 1 && progress > currentInterval.end.first)) {
+        //let's update currentInterval
+        QVariantAnimation::KeyValues::const_iterator it = qLowerBound(keyValues.constBegin(),
+                                                                      keyValues.constEnd(),
+                                                                      qMakePair(progress, QVariant()),
+                                                                      animationValueLessThan);
+        if (it == keyValues.constBegin()) {
+            //the item pointed to by it is the start element in the range    
+            if (it->first == 0 && keyValues.count() > 1) {
+                currentInterval.start = *it;
+                currentInterval.end = *(it+1);
+            } else {
+                currentInterval.start = qMakePair(qreal(0), defaultStartEndValue);
+                currentInterval.end = *it;
+            }
+        } else if (it == keyValues.constEnd()) {
+            --it; //position the iterator on the last item
+            if (it->first == 1 && keyValues.count() > 1) {
+                //we have an end value (item with progress = 1)
+                currentInterval.start = *(it-1);
+                currentInterval.end = *it;
+            } else {
+                //we use the default end value here
+                currentInterval.start = *it;
+                currentInterval.end = qMakePair(qreal(1), defaultStartEndValue);
+            }
+        } else {
+            currentInterval.start = *(it-1);
+            currentInterval.end = *it;
+        }
+
+        // update all the values of the currentInterval
+        updateInterpolator();
+    }
+    setCurrentValueForProgress(progress);
+}
+
+void QVariantAnimationPrivate::setCurrentValueForProgress(const qreal progress)
+{
+    Q_Q(QVariantAnimation);
+
+    const qreal startProgress = currentInterval.start.first;
+    const qreal endProgress = currentInterval.end.first;
+    const qreal localProgress = (progress - startProgress) / (endProgress - startProgress);
+
+    QVariant ret = q->interpolated(currentInterval.start.second,
+                                   currentInterval.end.second,
+                                   localProgress);
+    qSwap(currentValue, ret);
+    q->updateCurrentValue(currentValue);
+    static QBasicAtomicInt changedSignalIndex = Q_BASIC_ATOMIC_INITIALIZER(0);
+    if (!changedSignalIndex) {
+        //we keep the mask so that we emit valueChanged only when needed (for performance reasons)
+        changedSignalIndex.testAndSetRelaxed(0, signalIndex("valueChanged(QVariant)"));
+    }
+    if (isSignalConnected(changedSignalIndex) && currentValue != ret) {
+        //the value has changed
+        emit q->valueChanged(currentValue);
+    }
+}
+
+QVariant QVariantAnimationPrivate::valueAt(qreal step) const
+{
+    QVariantAnimation::KeyValues::const_iterator result =
+        qBinaryFind(keyValues.begin(), keyValues.end(), qMakePair(step, QVariant()), animationValueLessThan);
+    if (result != keyValues.constEnd())
+        return result->second;
+
+    return QVariant();
+}
+
+void QVariantAnimationPrivate::setValueAt(qreal step, const QVariant &value)
+{
+    if (step < qreal(0.0) || step > qreal(1.0)) {
+        qWarning("QVariantAnimation::setValueAt: invalid step = %f", step);
+        return;
+    }
+
+    QVariantAnimation::KeyValue pair(step, value);
+
+    QVariantAnimation::KeyValues::iterator result = qLowerBound(keyValues.begin(), keyValues.end(), pair, animationValueLessThan);
+    if (result == keyValues.end() || result->first != step) {
+        keyValues.insert(result, pair);
+    } else {
+        if (value.isValid())
+            result->second = value; // replaces the previous value
+        else
+            keyValues.erase(result); // removes the previous value
+    }
+
+    recalculateCurrentInterval(/*force=*/true);
+}
+
+void QVariantAnimationPrivate::setDefaultStartEndValue(const QVariant &value)
+{
+    defaultStartEndValue = value;
+    recalculateCurrentInterval(/*force=*/true);
+}
+
+/*!
+    Construct a QVariantAnimation object. \a parent is passed to QAbstractAnimation's
+    constructor.
+*/
+QVariantAnimation::QVariantAnimation(QObject *parent) : QAbstractAnimation(*new QVariantAnimationPrivate, parent)
+{
+}
+
+/*!
+    \internal
+*/
+QVariantAnimation::QVariantAnimation(QVariantAnimationPrivate &dd, QObject *parent) : QAbstractAnimation(dd, parent)
+{
+}
+
+/*!
+    Destroys the animation.
+*/
+QVariantAnimation::~QVariantAnimation()
+{
+}
+
+/*!
+    \property QVariantAnimation::easingCurve
+    \brief the easing curve of the animation
+
+    This property defines the easing curve of the animation. By
+    default, a linear easing curve is used, resulting in linear
+    interpolation. Other curves are provided, for instance,
+    QEasingCurve::InCirc, which provides a circular entry curve.
+    Another example is QEasingCurve::InOutElastic, which provides an
+    elastic effect on the values of the interpolated variant.
+
+    QVariantAnimation will use the QEasingCurve::valueForProgress() to
+    transform the "normalized progress" (currentTime / totalDuration)
+    of the animation into the effective progress actually
+    used by the animation. It is this effective progress that will be
+    the progress when interpolated() is called. Also, the steps in the
+    keyValues are referring to this effective progress.
+
+    The easing curve is used with the interpolator, the interpolated()
+    virtual function, the animation's duration, and iterationCount, to
+    control how the current value changes as the animation progresses.
+*/
+QEasingCurve QVariantAnimation::easingCurve() const
+{
+    Q_D(const QVariantAnimation);
+    return d->easing;
+}
+
+void QVariantAnimation::setEasingCurve(const QEasingCurve &easing)
+{
+    Q_D(QVariantAnimation);
+    d->easing = easing;
+    d->recalculateCurrentInterval();
+}
+
+typedef QVector<QVariantAnimation::Interpolator> QInterpolatorVector;
+Q_GLOBAL_STATIC(QInterpolatorVector, registeredInterpolators)
+
+/*!
+    \fn void qRegisterAnimationInterpolator(QVariant (*func)(const T &from, const T &to, qreal progress))
+    \relates QVariantAnimation
+    \threadsafe
+
+    Registers a custom interpolator \a func for the template type \c{T}.
+    The interpolator has to be registered before the animation is constructed.
+    To unregister (and use the default interpolator) set \a func to 0.
+ */
+
+/*!
+    \internal
+    \typedef QVariantAnimation::Interpolator
+
+    This is a typedef for a pointer to a function with the following
+    signature:
+    \code
+    QVariant myInterpolator(const QVariant &from, const QVariant &to, qreal progress);
+    \endcode
+
+*/
+
+/*! \internal
+ * Registers a custom interpolator \a func for the specific \a interpolationType.
+ * The interpolator has to be registered before the animation is constructed.
+ * To unregister (and use the default interpolator) set \a func to 0.
+ */
+void QVariantAnimation::registerInterpolator(QVariantAnimation::Interpolator func, int interpolationType)
+{
+    // will override any existing interpolators
+    QInterpolatorVector *interpolators = registeredInterpolators();
+    // When built on solaris with GCC, the destructors can be called
+    // in such an order that we get here with interpolators == NULL,
+    // to continue causes the app to crash on exit with a SEGV
+    if (interpolators) {
+#ifndef QT_NO_THREAD
+        QMutexLocker locker(QMutexPool::globalInstanceGet(interpolators));
+#endif
+        if (int(interpolationType) >= interpolators->count())
+            interpolators->resize(int(interpolationType) + 1);
+        interpolators->replace(interpolationType, func);
+    }
+}
+
+
+template<typename T> static inline QVariantAnimation::Interpolator castToInterpolator(QVariant (*func)(const T &from, const T &to, qreal progress))
+{
+     return reinterpret_cast<QVariantAnimation::Interpolator>(func);
+}
+
+QVariantAnimation::Interpolator QVariantAnimationPrivate::getInterpolator(int interpolationType)
+{
+    QInterpolatorVector *interpolators = registeredInterpolators();
+#ifndef QT_NO_THREAD
+    QMutexLocker locker(QMutexPool::globalInstanceGet(interpolators));
+#endif
+    QVariantAnimation::Interpolator ret = 0;
+    if (interpolationType < interpolators->count()) {
+        ret = interpolators->at(interpolationType);
+        if (ret) return ret;
+    }
+
+    switch(interpolationType)
+    {
+    case QMetaType::Int:
+        return castToInterpolator(_q_interpolateVariant<int>);
+    case QMetaType::Double:
+        return castToInterpolator(_q_interpolateVariant<double>);
+    case QMetaType::Float:
+        return castToInterpolator(_q_interpolateVariant<float>);
+    case QMetaType::QLine:
+        return castToInterpolator(_q_interpolateVariant<QLine>);
+    case QMetaType::QLineF:
+        return castToInterpolator(_q_interpolateVariant<QLineF>);
+    case QMetaType::QPoint:
+        return castToInterpolator(_q_interpolateVariant<QPoint>);
+    case QMetaType::QPointF:
+        return castToInterpolator(_q_interpolateVariant<QPointF>);
+    case QMetaType::QSize:
+        return castToInterpolator(_q_interpolateVariant<QSize>);
+    case QMetaType::QSizeF:
+        return castToInterpolator(_q_interpolateVariant<QSizeF>);
+    case QMetaType::QRect:
+        return castToInterpolator(_q_interpolateVariant<QRect>);
+    case QMetaType::QRectF:
+        return castToInterpolator(_q_interpolateVariant<QRectF>);
+    default:
+        return 0; //this type is not handled
+    }
+}
+
+/*!
+    \property QVariantAnimation::duration
+    \brief the duration of the animation
+
+    This property describes the duration in milliseconds of the
+    animation. The default duration is 250 milliseconds.
+
+    \sa QAbstractAnimation::duration()
+ */
+int QVariantAnimation::duration() const
+{
+    Q_D(const QVariantAnimation);
+    return d->duration;
+}
+
+void QVariantAnimation::setDuration(int msecs)
+{
+    Q_D(QVariantAnimation);
+    if (msecs < 0) {
+        qWarning("QVariantAnimation::setDuration: cannot set a negative duration");
+        return;
+    }
+    if (d->duration == msecs)
+        return;
+    d->duration = msecs;
+    d->recalculateCurrentInterval();
+}
+
+/*!
+    \property QVariantAnimation::startValue
+    \brief the optional start value of the animation
+
+    This property describes the optional start value of the animation. If
+    omitted, or if a null QVariant is assigned as the start value, the
+    animation will use the current position of the end when the animation
+    is started.
+
+    \sa endValue
+*/
+QVariant QVariantAnimation::startValue() const
+{
+    return keyValueAt(0);
+}
+
+void QVariantAnimation::setStartValue(const QVariant &value)
+{
+    setKeyValueAt(0, value);
+}
+
+/*!
+    \property QVariantAnimation::endValue
+    \brief the end value of the animation
+
+    This property describes the end value of the animation.
+
+    \sa startValue
+ */
+QVariant QVariantAnimation::endValue() const
+{
+    return keyValueAt(1);
+}
+
+void QVariantAnimation::setEndValue(const QVariant &value)
+{
+    setKeyValueAt(1, value);
+}
+
+
+/*!
+    Returns the key frame value for the given \a step. The given \a step
+    must be in the range 0 to 1. If there is no KeyValue for \a step,
+    it returns an invalid QVariant.
+
+    \sa keyValues(), setKeyValueAt()
+*/
+QVariant QVariantAnimation::keyValueAt(qreal step) const
+{
+    return d_func()->valueAt(step);
+}
+
+/*!
+    \typedef QVariantAnimation::KeyValue
+
+    This is a typedef for QPair<qreal, QVariant>.
+*/
+/*!
+    \typedef QVariantAnimation::KeyValues
+
+    This is a typedef for QVector<KeyValue>
+*/
+
+/*!
+    Creates a key frame at the given \a step with the given \a value.
+    The given \a step must be in the range 0 to 1.
+
+    \sa setKeyValues(), keyValueAt()
+*/
+void QVariantAnimation::setKeyValueAt(qreal step, const QVariant &value)
+{
+    d_func()->setValueAt(step, value);
+}
+
+/*!
+    Returns the key frames of this animation.
+
+    \sa keyValueAt(), setKeyValues()
+*/
+QVariantAnimation::KeyValues QVariantAnimation::keyValues() const
+{
+    return d_func()->keyValues;
+}
+
+/*!
+    Replaces the current set of key frames with the given \a keyValues.
+    the step of the key frames must be in the range 0 to 1.
+
+    \sa keyValues(), keyValueAt()
+*/
+void QVariantAnimation::setKeyValues(const KeyValues &keyValues)
+{
+    Q_D(QVariantAnimation);
+    d->keyValues = keyValues;
+    qSort(d->keyValues.begin(), d->keyValues.end(), animationValueLessThan);
+    d->recalculateCurrentInterval(/*force=*/true);
+}
+
+/*!
+    \property QVariantAnimation::currentValue
+    \brief the current value of the animation.
+
+    This property describes the current value; an interpolated value
+    between the \l{startValue}{start value} and the \l{endValue}{end
+    value}, using the current time for progress. The value itself is
+    obtained from interpolated(), which is called repeatedly as the
+    animation is running.
+
+    QVariantAnimation calls the virtual updateCurrentValue() function
+    when the current value changes. This is particularly useful for
+    subclasses that need to track updates. For example,
+    QPropertyAnimation uses this function to animate Qt \l{Qt's
+    Property System}{properties}.
+
+    \sa startValue, endValue
+*/
+QVariant QVariantAnimation::currentValue() const
+{
+    Q_D(const QVariantAnimation);
+    if (!d->currentValue.isValid())
+        const_cast<QVariantAnimationPrivate*>(d)->recalculateCurrentInterval();
+    return d->currentValue;
+}
+
+/*!
+    \reimp
+ */
+bool QVariantAnimation::event(QEvent *event)
+{
+    return QAbstractAnimation::event(event);
+}
+
+/*!
+    \reimp
+*/
+void QVariantAnimation::updateState(QAbstractAnimation::State newState,
+                                    QAbstractAnimation::State oldState)
+{
+    Q_UNUSED(oldState);
+    Q_UNUSED(newState);
+}
+
+/*!
+
+    This virtual function returns the linear interpolation between
+    variants \a from and \a to, at \a progress, usually a value
+    between 0 and 1. You can reimplement this function in a subclass
+    of QVariantAnimation to provide your own interpolation algorithm.
+
+    Note that in order for the interpolation to work with a
+    QEasingCurve that return a value smaller than 0 or larger than 1
+    (such as QEasingCurve::InBack) you should make sure that it can
+    extrapolate. If the semantic of the datatype does not allow
+    extrapolation this function should handle that gracefully.
+
+    You should call the QVariantAnimation implementation of this
+    function if you want your class to handle the types already
+    supported by Qt (see class QVariantAnimation description for a
+    list of supported types).
+
+    \sa QEasingCurve
+ */
+QVariant QVariantAnimation::interpolated(const QVariant &from, const QVariant &to, qreal progress) const
+{
+    return d_func()->interpolator(from.constData(), to.constData(), progress);
+}
+
+/*!
+    \reimp
+ */
+void QVariantAnimation::updateCurrentTime(int)
+{
+    d_func()->recalculateCurrentInterval();
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qvariantanimation.cpp"
+
+#endif //QT_NO_ANIMATION