#ifndef TNZ_SCROLLBAR_INCLUDED

#define TNZ_SCROLLBAR_INCLUDED

//#include "tw/action.h"

//#include "traster.h"

#include "tw/tw.h"

#undef DVAPI

#undef DVVAR

#ifdef TWIN_EXPORTS

#define DVAPI DV_EXPORT_API

#define DVVAR DV_EXPORT_VAR

#else

#define DVAPI DV_IMPORT_API

#define DVVAR DV_IMPORT_VAR

#endif

class TScrollbarGenericAction

{

public:

	TScrollbarGenericAction() {}

	virtual ~TScrollbarGenericAction() {}

	virtual void notify(int value) = 0;

};

template <class t=""></class>

class TScrollbarAction : public TScrollbarGenericAction

{

public:

	typedef void (T::*CommandMethod)(int value);

	T *m_target;

	CommandMethod m_method;

	TScrollbarAction<t>(T *target, CommandMethod method) : m_target(target), m_method(method){};</t>

	void notify(int value) { (m_target->*m_method)(value); };

};

class DVAPI TScrollbar : public TWidget

{

	int m_oldPos;

	int m_gPos, m_gMinPos, m_gMaxPos, m_gSize;

	int m_value, m_minValue, m_maxValue, m_cursorSize;

	const int m_buttonAreaSize;

	TScrollbarGenericAction *m_action;

	bool m_firstButtonPressed, m_secondButtonPressed;

	bool m_horizontal;

	bool m_minOverflowEnabled;

	bool m_maxOverflowEnabled;

	int m_buttonIncrement;

protected:

	void updatePositions();

	void drawHCursor(int x0, int x1);

	void drawVCursor(int y0, int y1);

	enum ButtonId { FIRST_BUTTON,

					SECOND_BUTTON };

	void drawButton(ButtonId id);

public:

	TScrollbar(TWidget *parent, string name = "scrollbar");

	~TScrollbar();

	void repaint();

	void leftButtonDown(const TMouseEvent &);

	void leftButtonDrag(const TMouseEvent &);

	void leftButtonUp(const TMouseEvent &);

	void configureNotify(const TDimension &d);

	void setValue(int value, int min, int max, int size);

	int getValue() const { return m_value; }

	// min <= value <= max

	// il cursore occupa almeno size/(max-min+size) dell'area disponibile

	// se size = 0 non c'e' cursore e lo slider e' disabilitato

	// se size>=max-min il cursore occupa tutto lo spazio e lo slider e' disabilitato

	//

	// value == min quando il cursore e' in alto

	// value == max quando il cursore e' in basso

	//

	// quando vengono premuti i bottoni value viene incrementato/decrementato di uno

	//

	// abilita/disabilita la possibilita' di agire sui bottoni anche

	// quando lo slider e' gia' sul massimo/minimo

	// default: false/false

	void enableButtonOverflow(bool min, bool max);

	// default: 4

	void setButtonIncrement(int d);

	void setAction(TScrollbarGenericAction *action);

	void onTimer(int v);

};

#endif