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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef GUITARTUNERUI_H
+#define GUITARTUNERUI_H
+
+#include <QWidget>
+#include <QDebug>
+
+namespace Ui {
+    class GuitarTunerUI;
+}
+
+const qreal FrequencyE = 82.407;
+const qreal FrequencyA = 110.00;
+const qreal FrequencyD = 146.83;
+const qreal FrequencyG = 196.00;
+const qreal FrequencyB = 246.94;
+const qreal FrequencyE2 = 329.63;
+
+class GuitarTunerUI : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit GuitarTunerUI(QWidget *parent = 0);
+    ~GuitarTunerUI();
+
+    qreal getVolume() const;
+    bool getMuteState() const;
+    qreal getMicrophoneSensitivity() const;
+    bool isInputModeActive() const;
+    qreal getFrequency() const;
+    int getScaleMaximumValue() const;
+    void setMaximumVoiceDifference(int max);
+    void setMaximumPrecisionPerNote(int max);
+
+public slots:
+    void toggleSound(bool off);
+    void next();
+    void prev();
+    void changeVolume();
+    void toggleInputOrOutput();
+
+    void lowVoice();
+    void voiceDifference(qreal difference);
+    void correctFrequencyObtained();
+
+signals:
+    void modeChanged(bool isInput);
+    void volumeChanged(qreal volume);
+    void microphoneSensitivityChanged(qreal sensitivity);
+    void muteChanged(bool isMuted);
+    void targetFrequencyChanged(qreal targetFrequency);
+
+protected:
+    void changeEvent(QEvent *e);
+
+private:
+    Ui::GuitarTunerUI *ui;
+    void changeTone(int newIndex);
+    qreal getVolumeFromSoundSlider() const;
+    int m_currentToneIndex;
+    QString m_currentToneString;
+    qreal m_currentToneFrequency;
+    void updateFrequencyByToneIndex(int index);
+    bool m_outputActive;
+    bool m_muted;
+    qreal m_outputVolumeLevel;
+    qreal m_inputVolumeLevel;
+    int m_maximumPrecision;
+};
+
+#endif // GUITARTUNERUI_H