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diff --git a/demos/spectrum/app/settingsdialog.cpp b/demos/spectrum/app/settingsdialog.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 "settingsdialog.h"
+#include <QComboBox>
+#include <QDialogButtonBox>
+#include <QLabel>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include <QCheckBox>
+#include <QSlider>
+#include <QSpinBox>
+
+SettingsDialog::SettingsDialog(
+            const QList<QAudioDeviceInfo> &availableInputDevices,
+            const QList<QAudioDeviceInfo> &availableOutputDevices,
+            QWidget *parent)
+    :   QDialog(parent)
+    ,   m_windowFunction(DefaultWindowFunction)
+    ,   m_inputDeviceComboBox(new QComboBox(this))
+    ,   m_outputDeviceComboBox(new QComboBox(this))
+    ,   m_windowFunctionComboBox(new QComboBox(this))
+{
+    QVBoxLayout *dialogLayout = new QVBoxLayout(this);
+
+    // Populate combo boxes
+
+    QAudioDeviceInfo device;
+    foreach (device, availableInputDevices)
+        m_inputDeviceComboBox->addItem(device.deviceName(),
+                                       qVariantFromValue(device));
+    foreach (device, availableOutputDevices)
+        m_outputDeviceComboBox->addItem(device.deviceName(),
+                                       qVariantFromValue(device));
+
+    m_windowFunctionComboBox->addItem(tr("None"), qVariantFromValue(int(NoWindow)));
+    m_windowFunctionComboBox->addItem("Hann", qVariantFromValue(int(HannWindow)));
+    m_windowFunctionComboBox->setCurrentIndex(m_windowFunction);
+
+    // Initialize default devices
+    if (!availableInputDevices.empty())
+        m_inputDevice = availableInputDevices.front();
+    if (!availableOutputDevices.empty())
+        m_outputDevice = availableOutputDevices.front();
+
+    // Add widgets to layout
+
+    QScopedPointer<QHBoxLayout> inputDeviceLayout(new QHBoxLayout);
+    QLabel *inputDeviceLabel = new QLabel(tr("Input device"), this);
+    inputDeviceLayout->addWidget(inputDeviceLabel);
+    inputDeviceLayout->addWidget(m_inputDeviceComboBox);
+    dialogLayout->addLayout(inputDeviceLayout.data());
+    inputDeviceLayout.take(); // ownership transferred to dialogLayout
+
+    QScopedPointer<QHBoxLayout> outputDeviceLayout(new QHBoxLayout);
+    QLabel *outputDeviceLabel = new QLabel(tr("Output device"), this);
+    outputDeviceLayout->addWidget(outputDeviceLabel);
+    outputDeviceLayout->addWidget(m_outputDeviceComboBox);
+    dialogLayout->addLayout(outputDeviceLayout.data());
+    outputDeviceLayout.take(); // ownership transferred to dialogLayout
+
+    QScopedPointer<QHBoxLayout> windowFunctionLayout(new QHBoxLayout);
+    QLabel *windowFunctionLabel = new QLabel(tr("Window function"), this);
+    windowFunctionLayout->addWidget(windowFunctionLabel);
+    windowFunctionLayout->addWidget(m_windowFunctionComboBox);
+    dialogLayout->addLayout(windowFunctionLayout.data());
+    windowFunctionLayout.take(); // ownership transferred to dialogLayout
+
+    // Connect
+    CHECKED_CONNECT(m_inputDeviceComboBox, SIGNAL(activated(int)),
+                    this, SLOT(inputDeviceChanged(int)));
+    CHECKED_CONNECT(m_outputDeviceComboBox, SIGNAL(activated(int)),
+                    this, SLOT(outputDeviceChanged(int)));
+    CHECKED_CONNECT(m_windowFunctionComboBox, SIGNAL(activated(int)),
+                    this, SLOT(windowFunctionChanged(int)));
+
+    // Add standard buttons to layout
+    QDialogButtonBox *buttonBox = new QDialogButtonBox(this);
+    buttonBox->setStandardButtons(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
+    dialogLayout->addWidget(buttonBox);
+
+    // Connect standard buttons
+    CHECKED_CONNECT(buttonBox->button(QDialogButtonBox::Ok), SIGNAL(clicked()),
+                    this, SLOT(accept()));
+    CHECKED_CONNECT(buttonBox->button(QDialogButtonBox::Cancel), SIGNAL(clicked()),
+                    this, SLOT(reject()));
+
+    setLayout(dialogLayout);
+}
+
+SettingsDialog::~SettingsDialog()
+{
+
+}
+
+void SettingsDialog::windowFunctionChanged(int index)
+{
+    m_windowFunction = static_cast<WindowFunction>(
+            m_windowFunctionComboBox->itemData(index).value<int>());
+}
+
+void SettingsDialog::inputDeviceChanged(int index)
+{
+    m_inputDevice = m_inputDeviceComboBox->itemData(index).value<QAudioDeviceInfo>();
+}
+
+void SettingsDialog::outputDeviceChanged(int index)
+{
+    m_outputDevice = m_outputDeviceComboBox->itemData(index).value<QAudioDeviceInfo>();
+}
+