// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __C_GUI_SCROLL_BAR_H_INCLUDED__
#define __C_GUI_SCROLL_BAR_H_INCLUDED__

#include "IrrCompileConfig.h"
#include "IGUIScrollBar.h"
#include "IGUIButton.h"

namespace irr
{
namespace gui
{

	class CGUIScrollBar : public IGUIScrollBar
	{
	public:

		//! constructor
		CGUIScrollBar(bool horizontal, IGUIEnvironment* environment,
			IGUIElement* parent, s32 id, core::rect<s32> rectangle,
			bool noclip=false);

		//! destructor
		virtual ~CGUIScrollBar();

		//! called if an event happened.
		bool OnEvent(const SEvent& event) override;

		//! draws the element and its children
		void draw() override;

		void OnPostRender(u32 timeMs) override;


		//! gets the maximum value of the scrollbar.
		s32 getMax() const override;

		//! sets the maximum value of the scrollbar.
		void setMax(s32 max) override;

		//! gets the minimum value of the scrollbar.
		s32 getMin() const override;

		//! sets the minimum value of the scrollbar.
		void setMin(s32 min) override;

		//! gets the small step value
		s32 getSmallStep() const override;

		//! sets the small step value
		void setSmallStep(s32 step) override;

		//! gets the large step value
		s32 getLargeStep() const override;

		//! sets the large step value
		void setLargeStep(s32 step) override;

		//! gets the current position of the scrollbar
		s32 getPos() const override;

		//! sets the position of the scrollbar
		void setPos(s32 pos) override;

		//! updates the rectangle
		void updateAbsolutePosition() override;

	private:

		void refreshControls();
		s32 getPosFromMousePos(const core::position2di &p) const;

		IGUIButton* UpButton;
		IGUIButton* DownButton;

		core::rect<s32> SliderRect;

		bool Dragging;
		bool Horizontal;
		bool DraggedBySlider;
		bool TrayClick;
		s32 Pos;
		s32 DrawPos;
		s32 DrawHeight;
		s32 Min;
		s32 Max;
		s32 SmallStep;
		s32 LargeStep;
		s32 DesiredPos;
		u32 LastChange;
		video::SColor CurrentIconColor;

		f32 range () const { return (f32) ( Max - Min ); }
	};

} // end namespace gui
} // end namespace irr

#endif