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diff --git a/src/corelib/statemachine/qsignaltransition.cpp b/src/corelib/statemachine/qsignaltransition.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qsignaltransition.h"
+
+#ifndef QT_NO_STATEMACHINE
+
+#include "qsignaltransition_p.h"
+#include "qsignalevent.h"
+#include "qstate.h"
+#include "qstate_p.h"
+#include "qstatemachine.h"
+#include "qstatemachine_p.h"
+#include <qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \class QSignalTransition
+
+  \brief The QSignalTransition class provides a transition based on a Qt signal.
+
+  \since 4.6
+  \ingroup statemachine
+
+  Typically you would use the overload of QState::addTransition() that takes a
+  sender and signal as arguments, rather than creating QSignalTransition
+  objects directly. QSignalTransition is part of \l{The State Machine
+  Framework}.
+
+  You can subclass QSignalTransition and reimplement eventTest() to make a
+  signal transition conditional; the event object passed to eventTest() will
+  be a QSignalEvent object. Example:
+
+  \code
+  class CheckedTransition : public QSignalTransition
+  {
+  public:
+      CheckedTransition(QCheckBox *check)
+          : QSignalTransition(check, SIGNAL(stateChanged(int))) {}
+  protected:
+      bool eventTest(QEvent *e) const {
+          if (!QSignalTransition::eventTest(e))
+              return false;
+          QSignalEvent *se = static_cast<QSignalEvent*>(e);
+          return (se->arguments().at(0).toInt() == Qt::Checked);
+      }
+  };
+
+  ...
+
+  QCheckBox *check = new QCheckBox();
+  check->setTristate(true);
+
+  QState *s1 = new QState();
+  QState *s2 = new QState();
+  CheckedTransition *t1 = new CheckedTransition(check);
+  t1->setTargetState(s2);
+  s1->addTransition(t1);
+  \endcode
+*/
+
+/*!
+    \property QSignalTransition::senderObject
+
+    \brief the sender object that this signal transition is associated with
+*/
+
+/*!
+    \property QSignalTransition::signal
+
+    \brief the signal that this signal transition is associated with
+*/
+
+QSignalTransitionPrivate::QSignalTransitionPrivate()
+{
+    sender = 0;
+    signalIndex = -1;
+}
+
+QSignalTransitionPrivate *QSignalTransitionPrivate::get(QSignalTransition *q)
+{
+    return q->d_func();
+}
+
+void QSignalTransitionPrivate::unregister()
+{
+    Q_Q(QSignalTransition);
+    if ((signalIndex == -1) || !machine())
+        return;
+    QStateMachinePrivate::get(machine())->unregisterSignalTransition(q);
+}
+
+void QSignalTransitionPrivate::maybeRegister()
+{
+    Q_Q(QSignalTransition);
+    if (!machine() || !machine()->configuration().contains(sourceState()))
+        return;
+    QStateMachinePrivate::get(machine())->registerSignalTransition(q);
+}
+
+/*!
+  Constructs a new signal transition with the given \a sourceState.
+*/
+QSignalTransition::QSignalTransition(QState *sourceState)
+    : QAbstractTransition(*new QSignalTransitionPrivate, sourceState)
+{
+}
+
+/*!
+  Constructs a new signal transition associated with the given \a signal of
+  the given \a sender, and with the given \a sourceState.
+*/
+QSignalTransition::QSignalTransition(QObject *sender, const char *signal,
+                                     QState *sourceState)
+    : QAbstractTransition(*new QSignalTransitionPrivate, sourceState)
+{
+    Q_D(QSignalTransition);
+    d->sender = sender;
+    d->signal = signal;
+}
+
+/*!
+  Constructs a new signal transition associated with the given \a signal of
+  the given \a sender. The transition has the given \a targets and \a
+  sourceState.
+*/
+QSignalTransition::QSignalTransition(QObject *sender, const char *signal,
+                                     const QList<QAbstractState*> &targets,
+                                     QState *sourceState)
+    : QAbstractTransition(*new QSignalTransitionPrivate, targets, sourceState)
+{
+    Q_D(QSignalTransition);
+    d->sender = sender;
+    d->signal = signal;
+}
+
+/*!
+  Destroys this signal transition.
+*/
+QSignalTransition::~QSignalTransition()
+{
+}
+
+/*!
+  Returns the sender object associated with this signal transition.
+*/
+QObject *QSignalTransition::senderObject() const
+{
+    Q_D(const QSignalTransition);
+    return d->sender;
+}
+
+/*!
+  Sets the \a sender object associated with this signal transition.
+*/
+void QSignalTransition::setSenderObject(QObject *sender)
+{
+    Q_D(QSignalTransition);
+    if (sender == d->sender)
+        return;
+    d->unregister();
+    d->sender = sender;
+    d->maybeRegister();
+}
+
+/*!
+  Returns the signal associated with this signal transition.
+*/
+QByteArray QSignalTransition::signal() const
+{
+    Q_D(const QSignalTransition);
+    return d->signal;
+}
+
+/*!
+  Sets the \a signal associated with this signal transition.
+*/
+void QSignalTransition::setSignal(const QByteArray &signal)
+{
+    Q_D(QSignalTransition);
+    if (signal == d->signal)
+        return;
+    d->unregister();
+    d->signal = signal;
+    d->maybeRegister();
+}
+
+/*!
+  \reimp
+
+  The \a event is a QSignalEvent object.  The default implementation returns
+  true if the event's sender and signal index match this transition, and
+  returns false otherwise.
+*/
+bool QSignalTransition::eventTest(QEvent *event)
+{
+    Q_D(const QSignalTransition);
+    if (event->type() == QEvent::Signal) {
+        if (d->signalIndex == -1)
+            return false;
+        QSignalEvent *se = static_cast<QSignalEvent*>(event);
+        return (se->sender() == d->sender)
+            && (se->signalIndex() == d->signalIndex);
+    }
+    return false;
+}
+
+/*!
+  \reimp
+*/
+void QSignalTransition::onTransition(QEvent *event)
+{
+    Q_UNUSED(event);
+}
+
+/*!
+  \reimp
+*/
+bool QSignalTransition::event(QEvent *e)
+{
+    return QAbstractTransition::event(e);
+}
+
+QT_END_NAMESPACE
+
+#endif //QT_NO_STATEMACHINE