overlay_scroll_bar.h

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#ifndef __OVERLAY_SCROLL_BAR_H__
#define __OVERLAY_SCROLL_BAR_H__
 
#include <QScrollBar>
 
class QProxyStyle;

class OverlayScrollBar : public QScrollBar
{
    Q_OBJECT
 
public:
    OverlayScrollBar(Qt::Orientation orientation, QWidget * parent = 0);

    virtual ~OverlayScrollBar();

    virtual QSize sizeHint() const override;

    virtual int sliderPosition();

    void setNearOverlayImage(QImage &overlay_image, int packet_count = -1, int start_pos = -1, int end_pos = -1, QList<int> positions = QList<int>(), int rowHeight = 1);

    void setMarkedPacketImage(QImage &mp_image);

    QRect grooveRect();
 
public slots:
    void setChildRange(int min, int max) { child_sb_.setRange(min, max); }
 
protected:
    virtual void resizeEvent(QResizeEvent * event) override;

    virtual void paintEvent(QPaintEvent * event) override;

    virtual bool eventFilter(QObject *watched, QEvent *event) override;

    virtual void mousePressEvent(QMouseEvent *) override { /* No-op */ }

    virtual void mouseReleaseEvent(QMouseEvent * event) override;
 
private:
    QProxyStyle* style_;

    QProxyStyle* child_style_;

    QScrollBar child_sb_;

    QImage packet_map_img_;

    QImage marked_packet_img_;

    int packet_map_width_;

    int marked_packet_width_;

    int packet_count_;

    int start_pos_;

    int end_pos_;

    QList<int> positions_;

    int row_height_;

    void updateChildStyle();
};
 
#endif // __OVERLAY_SCROLL_BAR_H__