#ifndef INPUTSCROLLBAR_H
#define INPUTSCROLLBAR_H

#include <allegro.h>

#include "ValuedGuiElement.h"

#include "InputGuiElementCallback.h"

class InputScrollbar : public ValuedGuiElement<int> {
      int x, y;
      int w, h;
      int limit;
      void (*func)();
      
      InputGuiElementCallback upButton;
      InputGuiElementCallback downButton;
      
      int value;
      
      public:
      void scrollUp();
      void scrollDown();
      
      InputScrollbar(BITMAP *desiredCanvas, int desiredX, int desiredY,
        int desiredW, int desiredH, int desiredLimit, void (*desiredFunc)(),
        int desiredValue = 0) :
        ValuedGuiElement<int>(desiredCanvas, false, false), x(desiredX),
        y(desiredY), w(desiredW), h(desiredH), limit(desiredLimit),
        func(desiredFunc), value(desiredValue), upButton(desiredCanvas,
        desiredX, desiredY, desiredW, desiredW, "-", (GuiElement*)this,
        (void (GuiElement::*)())&InputScrollbar::scrollUp),
        downButton(desiredCanvas, desiredX, desiredY + desiredH - desiredW,
        desiredW, desiredW, "+", (GuiElement*)this,
        (void (GuiElement::*)())&InputScrollbar::scrollDown) {}
      
      int getValue();
      void setValue(int desiredValue);
      
      void setLimit(int desiredLimit);
      
      InputGuiElementCallback* getUpButtonPointer();
      InputGuiElementCallback* getDownButtonPointer();
      
      bool acknowledgeMouse();
      
      void focus();
      void blur();
      
      void shift(int xOffset, int yOffset);
      bool within(int xOffset, int yOffset);
      void draw();
      void erase();
};

#endif