qaudiolevel.h Example File

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 #ifndef QAUDIOLEVEL_H
 #define QAUDIOLEVEL_H

 #include <QWidget>

 QT_USE_NAMESPACE

 class QAudioLevel : public QWidget
 {
     Q_OBJECT
 public:
     explicit QAudioLevel(QWidget *parent = 0);

     // Using [0; 1.0] range
     void setLevel(qreal level);

 protected:
     void paintEvent(QPaintEvent *event);

 private:
     qreal m_level;
 };

 #endif // QAUDIOLEVEL_H