Header File

#pragma once
#include <QWidget>
#include <QVector>
#include <QtGui>
#include <QtCore>

class Gradient : public QWidget
{
    struct StopColor
    {
        double stop;
        QString color;
    };

public:
    QVector<StopColor> m_gradient;
    int m_handle_w;
    int m_handle_h;
    int m_drag_position;

// Constructor
public:
    Gradient(QVector<StopColor> gradient);

// Public Functions
public:
    void _sort_gradient();
    void _constrain_gradient();
    void setGradient(QVector<StopColor> gradient);

signals:
    void gradientChanged();

protected:
    void paintEvent(QPaintEvent *e);
};