#ifndef SLIDER_P_H
#define SLIDER_P_H

#include "slider.h"
#include <QPainter>

#define THUMB_OUTER_SIZE 30

class SliderPrivate
{
    Q_DISABLE_COPY(SliderPrivate)
    Q_DECLARE_PUBLIC(Slider)

public:
    SliderPrivate(Slider *parent)
        : q_ptr(parent),
          orientation(Qt::Horizontal),
          hoverTrack(false),
          hoverThumb(false)
    {
        parent->setMouseTracking(true);
    }

    QRect trackGeometry() const
    {
        Q_Q(const Slider);

        return Qt::Horizontal == orientation
            ? QRect(THUMB_OUTER_SIZE/2, q->rect().height()/2 - 1,
                    q->rect().width() - THUMB_OUTER_SIZE, 2)
            : QRect(q->rect().width()/2 - 1, THUMB_OUTER_SIZE/2, 2,
                    q->rect().height() - THUMB_OUTER_SIZE);
    }

    void paintTrack(QPainter *painter)
    {
        Q_Q(Slider);

        painter->save();

        QBrush brush;
        brush.setStyle(Qt::SolidPattern);
        brush.setColor(QColor(0, 0, 0, 255));

        painter->fillRect(trackGeometry(), brush);

        painter->restore();

#ifdef DEBUG_LAYOUT
        if (hoverTrack) {
            painter->save();
            painter->setPen(Qt::red);
            painter->drawRect(trackGeometry());
            painter->restore();
        }
#endif
    }

    QRectF thumbGeometry() const
    {
        Q_Q(const Slider);

        return Qt::Horizontal == orientation
            ? QRectF(0, q->rect().height()/2 - THUMB_OUTER_SIZE/2,
                     THUMB_OUTER_SIZE, THUMB_OUTER_SIZE)
            : QRectF(q->rect().width()/2 - THUMB_OUTER_SIZE/2, 0,
                     THUMB_OUTER_SIZE, THUMB_OUTER_SIZE);
    }

    void paintThumb(QPainter *painter)
    {
        Q_Q(Slider);

        painter->save();

        QBrush brush;
        brush.setStyle(Qt::SolidPattern);
        brush.setColor(QColor(0, 0, 0, 255));
        painter->setBrush(brush);

        painter->setRenderHint(QPainter::Antialiasing);

        QRectF thumb(0, 0, 12, 12);
        thumb.moveCenter(thumbGeometry().center());

        painter->drawEllipse(thumb);

        painter->restore();

#ifdef DEBUG_LAYOUT
        painter->drawRect(thumbGeometry());

        if (hoverThumb) {
            painter->save();
            painter->setPen(Qt::red);
            painter->drawRect(thumbGeometry());
            painter->restore();
        }
#endif
    }

    Slider *const q_ptr;

    Qt::Orientation orientation;
    bool            hoverTrack;
    bool            hoverThumb;
};

#endif // SLIDER_P_H