levelslider.h

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// SPDX-License-Identifier: GPL-2.0+

#pragma once

#include <QWidget>

class QColor;

struct LevelSliderParameters {
    QColor color; 
    QString text; 
    bool visible; 

    double minimum; 
    double maximum; 
    double step;    
    double value;   

    // Needed for moving and drawing
    QRect rect; 
};

class LevelSlider : public QWidget {
    Q_OBJECT

  public:
    LevelSlider(Qt::ArrowType direction = Qt::RightArrow, QWidget *parent = nullptr);
    ~LevelSlider();

    QSize sizeHint() const;

    int preMargin() const;
    int postMargin() const;

    int addSlider(int index = -1);
    int addSlider(const QString &text, int index = -1);
    int removeSlider(int index = -1);

    // Parameters for a specific slider
    const QColor color(int index) const;
    void setColor(unsigned index, QColor color);
    const QString text(int index) const;
    int setText(int index, const QString &text);
    bool visible(int index) const;
    void setIndexVisible(unsigned index, bool visible);

    double minimum(int index) const;
    double maximum(int index) const;
    void setLimits(int index, double minimum, double maximum);
    double step(int index) const;
    double setStep(int index, double step);
    double value(int index) const;
    void setValue(int index, double value);

    // Parameters for all sliders
    Qt::ArrowType direction() const;
    int setDirection(Qt::ArrowType direction);

  protected:
    void mouseMoveEvent(QMouseEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);

    void paintEvent(QPaintEvent *event);
    void resizeEvent(QResizeEvent *event);

    QRect calculateRect(int sliderId);
    int calculateWidth();
    void fixValue(int index);

    QList<LevelSliderParameters *> slider; 
    int pressedSlider;                     
    int sliderWidth;                       

    Qt::ArrowType _direction; 
    int _preMargin;           
    int _postMargin;          

  signals:
    void valueChanged(int index, double value); 
};