.h
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//BIG_C_GOD
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class VolumeController : public QWidget
{
Q_OBJECT
public:
explicit VolumeController(QWidget *parent = 0);
void setMaxValue(int value);
protected:
int m_maxValue;
int m_value;
int m_mouseCurPos;
int m_isPress;
void mousePressEvent(QMouseEvent *);
void mouseMoveEvent(QMouseEvent *);
void mouseReleaseEvent(QMouseEvent *);
void leaveEvent(QEvent *);
void paintEvent(QPaintEvent *