guitartunerui.h Example File

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 #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