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diff --git a/demos/spectrum/app/progressbar.cpp b/demos/spectrum/app/progressbar.cpp
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+/****************************************************************************
+**
+** 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 examples 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 "progressbar.h"
+#include "spectrum.h"
+#include <QPainter>
+
+ProgressBar::ProgressBar(QWidget *parent)
+    :   QWidget(parent)
+    ,   m_bufferDuration(0)
+    ,   m_recordPosition(0)
+    ,   m_playPosition(0)
+    ,   m_windowPosition(0)
+    ,   m_windowLength(0)
+{
+    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
+    setMinimumHeight(30);
+#ifdef SUPERIMPOSE_PROGRESS_ON_WAVEFORM
+    setAutoFillBackground(false);
+#endif
+}
+
+ProgressBar::~ProgressBar()
+{
+
+}
+
+void ProgressBar::reset()
+{
+    m_bufferDuration = 0;
+    m_recordPosition = 0;
+    m_playPosition = 0;
+    m_windowPosition = 0;
+    m_windowLength = 0;
+    update();
+}
+
+void ProgressBar::paintEvent(QPaintEvent * /*event*/)
+{
+    QPainter painter(this);
+
+    QColor bufferColor(0, 0, 255);
+    QColor windowColor(0, 255, 0);
+
+#ifdef SUPERIMPOSE_PROGRESS_ON_WAVEFORM
+    bufferColor.setAlphaF(0.5);
+    windowColor.setAlphaF(0.5);
+#else
+    painter.fillRect(rect(), Qt::black);
+#endif
+
+    if (m_bufferDuration) {
+        QRect bar = rect();
+        const qreal play = qreal(m_playPosition) / m_bufferDuration;
+        bar.setLeft(rect().left() + play * rect().width());
+        const qreal record = qreal(m_recordPosition) / m_bufferDuration;
+        bar.setRight(rect().left() + record * rect().width());
+        painter.fillRect(bar, bufferColor);
+
+        QRect window = rect();
+        const qreal windowLeft = qreal(m_windowPosition) / m_bufferDuration;
+        window.setLeft(rect().left() + windowLeft * rect().width());
+        const qreal windowWidth = qreal(m_windowLength) / m_bufferDuration;
+        window.setWidth(windowWidth * rect().width());
+        painter.fillRect(window, windowColor);
+    }
+}
+
+void ProgressBar::bufferDurationChanged(qint64 bufferSize)
+{
+    m_bufferDuration = bufferSize;
+    m_recordPosition = 0;
+    m_playPosition = 0;
+    m_windowPosition = 0;
+    m_windowLength = 0;
+    repaint();
+}
+
+void ProgressBar::recordPositionChanged(qint64 recordPosition)
+{
+    Q_ASSERT(recordPosition >= 0);
+    Q_ASSERT(recordPosition <= m_bufferDuration);
+    m_recordPosition = recordPosition;
+    repaint();
+}
+
+void ProgressBar::playPositionChanged(qint64 playPosition)
+{
+    Q_ASSERT(playPosition >= 0);
+    Q_ASSERT(playPosition <= m_bufferDuration);
+    m_playPosition = playPosition;
+    repaint();
+}
+
+void ProgressBar::windowChanged(qint64 position, qint64 length)
+{
+    Q_ASSERT(position >= 0);
+    Q_ASSERT(position <= m_bufferDuration);
+    Q_ASSERT(position + length <= m_bufferDuration);
+    m_windowPosition = position;
+    m_windowLength = length;
+    repaint();
+}