ScrollPane.h

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#ifndef __SCROLLBAR_H
#define __SCROLLBAR_H

#include <Neo2DEngine.h>
#include <Container.h>
#include <ScrollBar.h>
#include <vector>

#define m_scrollWidth 1
#define SCROLL_BAR_WIDTH 10

namespace Neo2D
{
namespace Gui
{
using namespace Neo;

class NEO2D_EXPORT ScrollPane : public Container
{
    ScrollBar* m_horizontal;
    ScrollBar* m_vertical;

    void positionScrollBars()
    {       
        // Update scale and position
        m_horizontal->setSize(m_width - SCROLL_BAR_WIDTH, 1);
        m_vertical->setSize(1, m_height - SCROLL_BAR_WIDTH);

        m_horizontal->setPosition(Vector2(m_x, m_y+m_height-SCROLL_BAR_WIDTH));
        m_vertical->setPosition(Vector2(m_x + m_width - SCROLL_BAR_WIDTH, m_y));

        Vector2 sz = calculateContentSize();
        m_horizontal->setRange(Vector2(0, MAX(m_width - SCROLL_BAR_WIDTH, sz.x)));
        m_vertical->setRange(Vector2(0, MAX(m_height - SCROLL_BAR_WIDTH, sz.y)));
    }
    
public:
    ScrollPane(unsigned int x, unsigned int y, unsigned int width,
           unsigned int height)
        : Container(x, y, width, height, "")
    {
        m_horizontal = new ScrollBar(x, y+height-m_scrollWidth, width, m_scrollWidth, 0, 100, SLIDER_HORIZONTAL);
        
        m_vertical = new ScrollBar(x + width, y, m_scrollWidth, height, 0, 100, SLIDER_VERTICAL);
        positionScrollBars();
    }

    ~ScrollPane();

    void draw() { draw(Vector2(0,0)); }
    void draw(Vector2 offset);
    void update();

 private:
    Vector2 calculateValue() { return getPosition() - Vector2(floor(m_horizontal->getValue()), floor(m_vertical->getValue())); }

    Vector2 calculateContentSize();
    Vector2 getSize() { return Vector2(m_width - SCROLL_BAR_WIDTH, m_height - SCROLL_BAR_WIDTH); }
};

}
}

#endif