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diff --git a/src/3rdparty/phonon/mmf/ancestormovemonitor.cpp b/src/3rdparty/phonon/mmf/ancestormovemonitor.cpp
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+/* This file is part of the KDE project.
+
+Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+
+This library is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation, either version 2.1 or 3 of the License.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this library. If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "ancestormovemonitor.h"
+#include "utils.h"
+#include "videooutput.h"
+
+#include <QCoreApplication>
+
+QT_BEGIN_NAMESPACE
+
+using namespace Phonon::MMF;
+
+/*! \class MMF::AncestorMoveMonitor
+ \internal
+ \brief Class which installs a global event filter, and listens for move
+ events which may affect the absolute position of widgets registered with
+ the monitor
+ See QTBUG-4956
+*/
+
+//-----------------------------------------------------------------------------
+// Constructor / destructor
+//-----------------------------------------------------------------------------
+
+AncestorMoveMonitor::AncestorMoveMonitor(QObject *parent)
+ : QObject(parent)
+{
+ QCoreApplication::instance()->installEventFilter(this);
+}
+
+AncestorMoveMonitor::~AncestorMoveMonitor()
+{
+ QCoreApplication::instance()->removeEventFilter(this);
+}
+
+
+//-----------------------------------------------------------------------------
+// Public functions
+//-----------------------------------------------------------------------------
+
+void AncestorMoveMonitor::registerTarget(VideoOutput *target)
+{
+ TRACE_CONTEXT(AncestorMoveMonitor::registerTarget, EVideoInternal);
+ TRACE_ENTRY("target 0x%08x", target);
+
+ // First un-register the target, in case this is being called as a result
+ // of re-parenting. This is not the most efficient way to update the
+ // target hash, but since this is not likely to be a frequent operation,
+ // simplicity is preferred over outright speed. In any case, re-parenting
+ // of the video widget leads to re-creation of native windows, which is
+ // likely to take far more processing than any implementation of this
+ // function.
+ unRegisterTarget(target);
+
+ QWidget *ancestor = target->parentWidget();
+ while(ancestor) {
+ const Hash::iterator it = m_hash.find(ancestor);
+ if(m_hash.end() == it) {
+ TargetList targetList;
+ targetList.append(target);
+ m_hash.insert(ancestor, targetList);
+ } else {
+ TargetList& targetList = it.value();
+ Q_ASSERT(targetList.indexOf(target) == -1);
+ targetList.append(target);
+ }
+ ancestor = ancestor->parentWidget();
+ }
+
+ dump();
+
+ TRACE_EXIT_0();
+}
+
+void AncestorMoveMonitor::unRegisterTarget(VideoOutput *target)
+{
+ TRACE_CONTEXT(AncestorMoveMonitor::unRegisterTarget, EVideoInternal);
+ TRACE_ENTRY("target 0x%08x", target);
+
+ Hash::iterator it = m_hash.begin();
+ while(it != m_hash.end()) {
+ TargetList& targetList = it.value();
+ const int index = targetList.indexOf(target);
+ if(index != -1)
+ targetList.removeAt(index);
+ if(targetList.count())
+ ++it;
+ else
+ it = m_hash.erase(it);
+ }
+
+ dump();
+
+ TRACE_EXIT_0();
+}
+
+bool AncestorMoveMonitor::eventFilter(QObject *watched, QEvent *event)
+{
+ TRACE_CONTEXT(AncestorMoveMonitor::eventFilter, EVideoInternal);
+
+ if(event->type() == QEvent::Move || event->type() == QEvent::ParentChange) {
+
+ //TRACE_ENTRY("watched 0x%08x event.type %d", watched, event->type());
+
+ const Hash::const_iterator it = m_hash.find(watched);
+ if(it != m_hash.end()) {
+ const TargetList& targetList = it.value();
+ VideoOutput* target = 0;
+ foreach(target, targetList) {
+ switch (event->type()) {
+
+ case QEvent::Move:
+ // Notify the target that its ancestor has moved
+ target->ancestorMoved();
+ break;
+
+ case QEvent::ParentChange:
+ // Update ancestor list for the target
+ registerTarget(target);
+ break;
+
+ default:
+ Q_ASSERT(false);
+ }
+ }
+ }
+
+ //TRACE_EXIT_0();
+ }
+
+ // The event is never consumed by this filter
+ return false;
+}
+
+//-----------------------------------------------------------------------------
+// Private functions
+//-----------------------------------------------------------------------------
+
+void AncestorMoveMonitor::dump()
+{
+#ifndef QT_NO_DEBUG
+ TRACE_CONTEXT(AncestorMoveMonitor::dump, EVideoInternal);
+ for(Hash::const_iterator it = m_hash.begin();
+ it != m_hash.end(); ++it) {
+ const QObject *ancestor = it.key();
+ TRACE("ancestor 0x%08x", ancestor);
+ const TargetList& targetList = it.value();
+ VideoOutput* target = 0;
+ foreach(target, targetList) {
+ TRACE(" target 0x%08x", target);
+ }
+ }
+#endif
+}
+
+
+
+QT_END_NAMESPACE
+