rangeslider.h

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#ifndef OPENSWMMVIS_UI_WIDGETS_RANGESLIDER_H
#define OPENSWMMVIS_UI_WIDGETS_RANGESLIDER_H
 
#include <QWidget>
 
namespace openswmmvis::ui {
 
class RangeSliderWidget : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(qreal lo READ lo NOTIFY rangeChanged)
    Q_PROPERTY(qreal hi READ hi NOTIFY rangeChanged)
public:
    explicit RangeSliderWidget(QWidget *parent = nullptr);
 
    qreal lo() const noexcept { return m_lo; }
    qreal hi() const noexcept { return m_hi; }
 
    void setRange(qreal lo, qreal hi);
 
    QSize sizeHint() const override { return {300, 20}; }
    QSize minimumSizeHint() const override { return {120, 20}; }
 
signals:
    void rangeChanged(qreal lo, qreal hi);
 
protected:
    void paintEvent(QPaintEvent *e) override;
    void mousePressEvent(QMouseEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void mouseReleaseEvent(QMouseEvent *e) override;
    void keyPressEvent(QKeyEvent *e) override;
 
private:
    enum class DragKind { None, Lo, Hi, Both };
 
    int   trackLeft()   const noexcept;
    int   trackRight()  const noexcept;
    int   trackWidth()  const noexcept;
    qreal pixelToNorm(int px) const noexcept;
    int   normToPixel(qreal v) const noexcept;
    DragKind hitTest(const QPoint &p) const noexcept;
 
    qreal m_lo = 0.0;
    qreal m_hi = 1.0;
 
    DragKind m_drag        = DragKind::None;
    int      m_dragOriginPx = 0;
    qreal    m_dragOriginLo = 0.0;
    qreal    m_dragOriginHi = 1.0;
};
 
} // namespace openswmmvis::ui
 
#endif // OPENSWMMVIS_UI_WIDGETS_RANGESLIDER_H