QRangeSlider.h

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#pragma once
 
#include <QSlider>
 
class QStylePainter;
 
class QRangeSlider : public QSlider {
    Q_OBJECT
 
public:
    QRangeSlider();
    QRangeSlider(Qt::Orientation orientation);
    QSize minimumSizeHint() const;
    void  SetValue(float min, float max);
    void  setStyle(QStyle *style) = delete;
 
signals:
    void ValueChangedBegin();
    void ValueChangedIntermediate(float min, float max);
    void ValueChanged(float min, float max);
 
protected:
    void paintEvent(QPaintEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    //    void mouseDoubleClickEvent(QMouseEvent *event);
 
private:
    int   _position[2];
    int   _value[2];
    bool  _isOutOfBounds[2] = {false};
    float _outOfBoundValue[2];
    int   _grabbedControl = -1;
    int   _lastSelectedControl = 0;
 
    bool _grabbedBar = false;
    int  _grabbedBarPosition;
    int  _grabbedBarStartPosition;
    int  _grabbedBarControlStartPositions[2];
 
    void paintHandle(QStylePainter &p, int i);
    void paintTrack(QStylePainter &p);
    bool doesHandleContainPixel(int handle, const QPoint &pixel) const;
    bool doesGrooveContainPixel(const QPoint &pixel) const;
    bool isSliderDown(int i) const;
    void swapSliders();
    void emitValueChanged(bool intermediate = false);
};