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;                         
    int needleWidth;                         

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

  signals:
    void valueChanged( int index, double value, bool pressed = false ); 
};