/*      @(#)scrollbar.h 1.35 91/03/19	*/

/*
 *	(c) Copyright 1989 Sun Microsystems, Inc. Sun design patents 
 *	pending in the U.S. and foreign countries. See LEGAL NOTICE 
 *	file for terms of the license.
 */

#ifndef	xview_scrollbar_DEFINED
#define	xview_scrollbar_DEFINED

/*
 * Module:	scrollbar.h
 * Library:	libxview.a
 *
 * Level:	public
 *
 * Description:	Describes attributes for scrollbar
 *
 */

/*
 ***********************************************************************
 *			Include Files
 ***********************************************************************
 */
 
#include <xview/pkg.h>
#include <xview/window.h>
#include <xview/attrol.h>

/*
 ***********************************************************************
 *			Definitions and Macros
 ***********************************************************************
 */

/*
 * PUBLIC #defines 
 */

#define SCROLLBAR   			&xv_scrollbar_pkg

#define	SCROLLBAR_FIRST    		vuid_first(SCROLL_DEVID) /* 32256 */
#define	SCROLLBAR_REQUEST  		(SCROLLBAR_FIRST+0)         /* 32256 */

/* SunView1 Compatiblity */
#define SCROLL_LINE_HEIGHT	SCROLLBAR_PIXELS_PER_UNIT

/*
 * PRIVATE #defines 
 */

#define	SCROLLBAR_ATTR(type, ordinal)	ATTR(ATTR_PKG_SCROLLBAR, type, ordinal)

/*
 ***********************************************************************
 *		Typedefs, Enumerations, and Structures
 ***********************************************************************
 */

typedef Xv_opaque  Scrollbar;
 
typedef struct {
	Xv_window_struct	parent_data;
	Xv_opaque		private_data;
}  Xv_scrollbar;

typedef enum {
	/*
	 * Public Attributes 
	 */
	SCROLLBAR_COMPUTE_SCROLL_PROC	= SCROLLBAR_ATTR(ATTR_FUNCTION_PTR,  6),
	SCROLLBAR_DIRECTION		= SCROLLBAR_ATTR(ATTR_ENUM,	  8),
        SCROLLBAR_PERCENT_OF_DRAG_REPAINTS = SCROLLBAR_ATTR(ATTR_INT,    15),
	SCROLLBAR_INACTIVE		= SCROLLBAR_ATTR(ATTR_BOOLEAN,   13),
	SCROLLBAR_LAST_VIEW_START	= SCROLLBAR_ATTR(ATTR_INT,	 10),
	SCROLLBAR_MENU			= SCROLLBAR_ATTR(ATTR_OPAQUE,	 11),
	SCROLLBAR_MOTION		= SCROLLBAR_ATTR(ATTR_INT,	 14),
	SCROLLBAR_NORMALIZE_PROC	= SCROLLBAR_ATTR(ATTR_FUNCTION_PTR,  5),
	SCROLLBAR_NOTIFY_CLIENT		= SCROLLBAR_ATTR(ATTR_OPAQUE,	  9),
	SCROLLBAR_OBJECT_LENGTH		= SCROLLBAR_ATTR(ATTR_INT,	  1),
	SCROLLBAR_OVERSCROLL		= SCROLLBAR_ATTR(ATTR_INT,	 12),
	SCROLLBAR_PAGE_LENGTH		= SCROLLBAR_ATTR(ATTR_INT,	  4),
	SCROLLBAR_PIXELS_PER_UNIT	= SCROLLBAR_ATTR(ATTR_INT,	  0),
	SCROLLBAR_SPLITTABLE		= SCROLLBAR_ATTR(ATTR_BOOLEAN,	  7),
	SCROLLBAR_VIEW_START		= SCROLLBAR_ATTR(ATTR_INT,	  2),
	SCROLLBAR_VIEW_LENGTH		= SCROLLBAR_ATTR(ATTR_INT,	  3)
} Scrollbar_attribute;


typedef enum {
	/*
	 * absolute motion 
	 */
	SCROLLBAR_ABSOLUTE,	 
	/*
	 * forward motions 
	 */
	SCROLLBAR_POINT_TO_MIN,
	SCROLLBAR_PAGE_FORWARD,
	SCROLLBAR_LINE_FORWARD,
	/*
	 * backward motions 
	 */
	SCROLLBAR_MIN_TO_POINT,
	SCROLLBAR_PAGE_BACKWARD,
	SCROLLBAR_LINE_BACKWARD,
	/*
	 * first last motions 
	 */
	SCROLLBAR_TO_END,
	SCROLLBAR_TO_START,
	SCROLLBAR_PAGE_ALIGNED,
	/*
	 * no scrolling 
	 */
	SCROLLBAR_NONE
} Scroll_motion;

typedef enum {
	SCROLLBAR_VERTICAL,
	SCROLLBAR_HORIZONTAL
} Scrollbar_setting;

/*
 ***********************************************************************
 *				Globals
 ***********************************************************************
 */

extern Xv_pkg 		xv_scrollbar_pkg;

/*
 * Public functions 
 */

EXTERN_FUNCTION (void scrollbar_default_compute_scroll_proc, (Scrollbar sb, int pos, int length, Scroll_motion motion, unsigned long *offset, unsigned long *object_length));

EXTERN_FUNCTION (void scrollbar_paint, (Scrollbar sb));

/*
 * XView-private functions
 */
EXTERN_FUNCTION (int scrollbar_width_for_scale, (Window_rescale_state scale));
 
/*
 * For SunView 1 Compatibility
 */
EXTERN_FUNCTION (Scrollbar scrollbar_create, (Attr_attribute attr1, DOTDOTDOT));
EXTERN_FUNCTION (int scrollbar_set, (Scrollbar sb, DOTDOTDOT));
EXTERN_FUNCTION (Xv_opaque scrollbar_get, (Scrollbar sb, Attr_attribute attr));
EXTERN_FUNCTION (int scrollbar_destroy, (Scrollbar sb));
EXTERN_FUNCTION (void scrollbar_scroll_to, (Scrollbar sb, unsigned long new_start));

#endif	 /* ~xview_scrollbar_DEFINED */