RingSlider.h

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#ifndef RINGSLIDER_H
#define RINGSLIDER_H
 
#include <QSlider>
 
class RingSlider : public QSlider {
protected:
    int handle_size_ = 16;
    QRect slider_rect_;
    QRect handle_rect_;
    int mouse_press_value_;
    QPoint mouse_press_pos_;
    QImage slider_image_cache_;
    void updateGeometry();
    QSize sliderImageSize() const;
    void offset(int delta);
    void resizeEvent(QResizeEvent *e) override;
    void keyPressEvent(QKeyEvent *e) override;
    void paintEvent(QPaintEvent *) override;
    void mousePressEvent(QMouseEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void mouseDoubleClickEvent(QMouseEvent *e) override;
    void wheelEvent(QWheelEvent *e) override;
    virtual QImage generateSliderImage() = 0;
public:
    explicit RingSlider(QWidget *parent = nullptr)
        : QSlider(parent)
    {}
};
 
 
#endif // RINGSLIDER_H