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/*
 *      Functions for scrollbars
 *
 *      Copyright (c) 1992-93 by Udo Munk
 */

#ifdef AIX
#define NLS
#endif

#include <curses.h>
#include "winfun.h"

extern WINDOW *open_window();
extern void free();

SCROLLBAR *create_scrollbar(y, x, s)
int x, y, s;
{
	register SCROLLBAR *sp;
	register int i;

	if ((sp = (SCROLLBAR *) malloc(sizeof(SCROLLBAR))) == NULL)
		nomem();
	if ((sp->sc_window = open_window(s, 2, y, x)) == (WINDOW *) 0)
		nomem();
	sp->sc_size = s;
	sp->sc_position = 1;
	mvwaddch(sp->sc_window, 0, 1, u_arrow);
	mvwaddch(sp->sc_window, 1, 1, fullboard);
	for (i = 2; i < s -1; i++)
		mvwaddch(sp->sc_window, i, 1, checkboard);
	mvwaddch(sp->sc_window, s-1, 1, d_arrow);
	wrefresh(sp->sc_window);
	return (sp);
}

remove_scrollbar(p)
SCROLLBAR *p;
{
	close_window(p->sc_window);
	free((char *) p);
}

update_slider(s, n, p)
SCROLLBAR *s;
int n, p;
{
	register int np;

	/* compute new position of the slider */
	if (p == 0)
		np = 1;
	else if (p == n-1)
		np = s->sc_size - 2;
	else
		np = (s->sc_size - 2) * p / n + 1;

	/* update position of the slider */
	if (np != s->sc_position) {
		mvwaddch(s->sc_window, s->sc_position, 1, checkboard);
		mvwaddch(s->sc_window, np, 1, fullboard);
		s->sc_position = np;
		wrefresh(s->sc_window);
	}
}

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