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From: elh@vu-vlsi.UUCP (Edward L. Hepler)
Newsgroups: comp.sys.att
Subject: Help with 3b1 track(3T)
Message-ID: <1163@vu-vlsi.UUCP>
Date: Fri, 16-Oct-87 00:46:07 EDT
Article-I.D.: vu-vlsi.1163
Posted: Fri Oct 16 00:46:07 1987
Date-Received: Sat, 17-Oct-87 16:32:58 EDT
Organization: Villanova Univ. EE Dept.
Lines: 137


I have been trying to figure out how track(3T) works all evening!

I assumed that one calls track and it returns when something happens
which it thinks you should know about.  I am getting very strange results.
I have written a small program to try to get the feel for what is going
on and have run out of ideas.  Can anyone help me?

I am running on a 3b1 release 3.5 of the OS, release 3.51 of the development
tools.  I compile using:
cc -o dr d.c -ltam -ltermcap

Many thanks,
Ed Hepler
elh@vu-vlsi

The source for d.c follows:


#include <stdio.h>
#include <tam.h>
#include <track.h>

track_t screen_map;

tkitem_t track_items[] = {
	{0,	0,	100,	100,	(struct icon *)0,	1},
	{0,	100,	100,	100,	(struct icon *)0,	2},
	{0,	200,	100,	100,	(struct icon *)0,	3},
	{100,	0,	300,	300,	(struct icon *)0,	4},
	{0,0,0,0,(struct icon *)0,0}
	};
	
main(argc,argv)
	int argc;
	char *argv[];
{
int pw;
pw = init_screen();
setup_screen(pw);
cycle_screen(pw);
}

int
init_screen()
{
int pw;

winit();
if((pw = wcreate((short)1,(short)0,(short)24,(short)80,
		(unsigned short)NBORDER)) < 0)
	{
	perror("Couldn't open window");
	exit(1);
	}
clear();
return(pw);
}

restore_screen(pw,exit_code)
	int pw;
	int exit_code;
{
struct wstat curstat;

clear();
curstat.begx = 0;
curstat.begy = 1;
curstat.height = 18;
curstat.width = 80;
curstat.uflags = BORDRESIZE | NOSETUFLAGS;
wsetstat(pw,&curstat);
wexit(exit_code);
}

setup_screen(pw)
	int pw;
{
int but,why;
int reason;

screen_map.t_flags = MSUP | MSDOWN;
screen_map.t_scalex = screen_map.t_scaley = 1;
screen_map.t_tkitems = track_items;

reason = track(pw,&screen_map,T_BEGIN,&but,&why);
wgoto(pw,2,0);
wprintf(pw,"Init to track returned %d",reason);
} 

cycle_screen(pw)
	int pw;
{
int but,why;
int reason;
int loop = 0;

while(1)
	{
wgoto(pw,3,0);
wprintf(pw,"Loop is %d",loop);
	reason = track(pw,&screen_map,T_INPUT,&but,&why);
	switch(reason)
		{
	case Mouse:
		switch(why)
			{
		case MSIN:
wgoto(pw,4,0);
wprintf(pw,"Mouse entered window - loop %d",loop);
			break;
		case MSOUT:
wgoto(pw,5,0);
wprintf(pw,"Mouse outside window - loop %d",loop);
			break;
		case MSUP:
wgoto(pw,6,0);
wprintf(pw,"Mouse button up - loop %d",loop);
			break;
		case MSDOWN:
wgoto(pw,7,0);
wprintf(pw,"Mouse button down - loop %d",loop);
			break;
		default:
wgoto(pw,8,0);
wprintf(pw,"Unknown why - loop %d",loop);
			restore_screen(pw,1);
			break;
			}
	default:
wgoto(pw,9,0);
wprintf(pw,"Keycode returned: %o",reason);
		break;
		}
	loop++;
	}
}