volumebutton.h Example File

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  #ifndef VOLUMEBUTTON_H
  #define VOLUMEBUTTON_H

  #include <QToolButton>

  QT_FORWARD_DECLARE_CLASS(QMenu)
  QT_FORWARD_DECLARE_CLASS(QLabel)
  QT_FORWARD_DECLARE_CLASS(QSlider)

  class VolumeButton : public QToolButton
  {
      Q_OBJECT
      Q_PROPERTY(int volume READ volume WRITE setVolume NOTIFY volumeChanged)

  public:
      explicit VolumeButton(QWidget *parent = nullptr);

      int volume() const;

  public slots:
      void increaseVolume();
      void descreaseVolume();
      void setVolume(int volume);
      void stylize();

  signals:
      void volumeChanged(int volume);

  private:
      QMenu *menu = nullptr;
      QLabel *label = nullptr;
      QSlider *slider = nullptr;
  };

  #endif // VOLUMEBUTTON_H