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diff --git a/examples/spectrum/app/mainwidget.h b/examples/spectrum/app/mainwidget.h
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--- a/examples/spectrum/app/mainwidget.h
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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 examples of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** You may use this file under the terms of the BSD license as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-**   * Redistributions of source code must retain the above copyright
-**     notice, this list of conditions and the following disclaimer.
-**   * Redistributions in binary form must reproduce the above copyright
-**     notice, this list of conditions and the following disclaimer in
-**     the documentation and/or other materials provided with the
-**     distribution.
-**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
-**     the names of its contributors may be used to endorse or promote
-**     products derived from this software without specific prior written
-**     permission.
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef MAINWIDGET_H
-#define MAINWIDGET_H
-
-#include <QWidget>
-#include <QIcon>
-#include <QtMultimedia/qaudio.h>
-
-class Engine;
-class FrequencySpectrum;
-class ProgressBar;
-class Spectrograph;
-class Waveform;
-class LevelMeter;
-class SettingsDialog;
-class ToneGeneratorDialog;
-
-QT_FORWARD_DECLARE_CLASS(QAudioFormat)
-QT_FORWARD_DECLARE_CLASS(QLabel)
-QT_FORWARD_DECLARE_CLASS(QPushButton)
-QT_FORWARD_DECLARE_CLASS(QMenu)
-QT_FORWARD_DECLARE_CLASS(QAction)
-
-/**
- * Main application widget, responsible for connecting the various UI
- * elements to the Engine.
- */
-class MainWidget : public QWidget {
-    Q_OBJECT
-public:
-    MainWidget(QWidget *parent = 0);
-    ~MainWidget();
-
-    // QObject
-    void timerEvent(QTimerEvent *event);
-
-public slots:
-    void stateChanged(QAudio::Mode mode, QAudio::State state);
-    void formatChanged(const QAudioFormat &format);
-    void spectrumChanged(qint64 position, qint64 length,
-                         const FrequencySpectrum &spectrum);
-    void infoMessage(const QString &message, int timeoutMs);
-    void errorMessage(const QString &heading, const QString &detail);
-    void audioPositionChanged(qint64 position);
-    void bufferLengthChanged(qint64 length);
-
-private slots:
-    void showFileDialog();
-    void showSettingsDialog();
-    void showToneGeneratorDialog();
-    void initializeRecord();
-    void updateModeMenu();
-    void updateButtonStates();
-
-private:
-    void createUi();
-    void createMenus();
-    void connectUi();
-    void reset();
-
-    enum Mode {
-        NoMode,
-        RecordMode,
-        GenerateToneMode,
-        LoadFileMode
-    };
-
-    void setMode(Mode mode);
-
-private:
-    Mode                    m_mode;
-
-    Engine*                 m_engine;
-
-#ifndef DISABLE_WAVEFORM
-    Waveform*               m_waveform;
-#endif
-    ProgressBar*            m_progressBar;
-    Spectrograph*           m_spectrograph;
-    LevelMeter*             m_levelMeter;
-
-    QPushButton*            m_modeButton;
-    QPushButton*            m_recordButton;
-    QIcon                   m_recordIcon;
-    QPushButton*            m_pauseButton;
-    QIcon                   m_pauseIcon;
-    QPushButton*            m_playButton;
-    QIcon                   m_playIcon;
-    QPushButton*            m_settingsButton;
-    QIcon                   m_settingsIcon;
-
-    QLabel*                 m_infoMessage;
-    int                     m_infoMessageTimerId;
-
-    SettingsDialog*         m_settingsDialog;
-    ToneGeneratorDialog*    m_toneGeneratorDialog;
-
-    QMenu*                  m_modeMenu;
-    QAction*                m_loadFileAction;
-    QAction*                m_generateToneAction;
-    QAction*                m_recordAction;
-
-};
-
-#endif // MAINWIDGET_H