/////////////////////////////////////////////////////////////////////////////
//
//  GEMslider
//
//  A GEMslider is an example GEMobject derivation.
//
//  This file is Copyright 1992 by Warwick W. Allison,
//  This file is part of the gem++ library.
//  You are free to copy and modify these sources, provided you acknowledge
//  the origin by retaining this notice, and adhere to the conditions
//  described in the file COPYING.LIB.
//
/////////////////////////////////////////////////////////////////////////////


#ifndef GEMsl_h
#define GEMsl_h

#include <gemo.h>


class GEMslider : public GEMobject
{
public:
	GEMslider(GEMform&, int RSCknob, int RSCrack);
	GEMslider(GEMform&, int RSCknob, int RSCrack, int RSCminus, int RSCplus);
	GEMslider(GEMform&, int RSCknob, int RSCrack,
		int RSChminus, int RSChplus,
		int RSCvminus, int RSCvplus);
	~GEMslider();

	// Methods similar to GEMwindow...

	// No methods flush their changes.
	virtual void Flush();

	void SetVisibleLines(int noOfLines);
	void SetTotalLines(int noOfLines);
	void SetTopLine(int noOfLine);
	void SetVisibleColumns(int noOfColumns);
	void SetTotalColumns(int noOfColumns);
	void SetLeftColumn(int noOfColumn);

	int VisibleLines() { return visibleLines; }
	int VisibleColumns() { return visibleColumns; }

	int TopLine() { return actualTopLine; }
	int LeftColumn() { return actualLeftColumn; }

	void LineUp();
	void LineDown();
	void PageUp();
	void PageDown();
	
	void ColumnLeft();
	void ColumnRight();
	void PageLeft();
	void PageRight();

	void DOCtoGEM();
	void GEMtoDOC();

	GEMfeedback Touch(int x, int y, const GEMevent&);

private:
	class SL_Knob* K;
	class SL_Up* U;
	class SL_Down* D;
	class SL_Left* L;
	class SL_Right* R;
	int actualTopLine,actualLeftColumn;
	int visibleLines,visibleColumns;
	int totalLines,totalColumns;
};


#endif