test/demo_keyok.c

/****************************************************************************
 * Copyright 2020,2022 Thomas E. Dickey                                     *
 * Copyright 2002-2006,2017 Free Software Foundation, Inc.                  *
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/*
 * $Id: demo_keyok.c,v 1.9 2022/12/10 23:31:31 tom Exp $
 *
 * Demonstrate the keyok() function.
 * Thomas Dickey - 2002/11/23
 */

#include <test.priv.h>

#if defined(NCURSES_VERSION) && NCURSES_EXT_FUNCS
static void
usage(int ok)
{
    static const char *msg[] =
    {
	"Usage: demo_keyok [options]"
	,""
	,USAGE_COMMON
    };
    size_t n;

    for (n = 0; n < SIZEOF(msg); n++)
	fprintf(stderr, "%s\n", msg[n]);

    ExitProgram(ok ? EXIT_SUCCESS : EXIT_FAILURE);
}
/* *INDENT-OFF* */
VERSION_COMMON()
/* *INDENT-ON* */

int
main(int argc, char *argv[])
{
    int lastch = ERR;
    int prior = ERR;
    int ch;
    WINDOW *win;

    while ((ch = getopt(argc, argv, OPTS_COMMON)) != -1) {
	switch (ch) {
	case OPTS_VERSION:
	    show_version(argv);
	    ExitProgram(EXIT_SUCCESS);
	default:
	    usage(ch == OPTS_USAGE);
	    /* NOTREACHED */
	}
    }
    if (optind < argc)
	usage(FALSE);

    setlocale(LC_ALL, "");
    initscr();
    (void) cbreak();		/* take input chars one at a time, no wait for \n */
    (void) noecho();		/* don't echo input */

    printw("Typing any function key will disable it, but typing it twice in\n");
    printw("a row will turn it back on (just for a demo).");
    refresh();

    win = newwin(LINES - 2, COLS, 2, 0);
    scrollok(win, TRUE);
    keypad(win, TRUE);
    wmove(win, 0, 0);

    while ((ch = wgetch(win)) != ERR) {
	const char *name = keyname(ch);
	if (ch == ESCAPE && prior == ch)
	    break;
	prior = ch;
	wprintw(win, "Keycode %d, name %s\n",
		ch,
		name != 0 ? name : "<null>");
	wclrtoeol(win);
	wrefresh(win);
	if (ch >= KEY_MIN) {
	    keyok(ch, FALSE);
	    lastch = ch;
	} else if (lastch >= KEY_MIN) {
	    keyok(lastch, TRUE);
	}
    }
    endwin();
    ExitProgram(EXIT_SUCCESS);
}
#else
int
main(void)
{
    printf("This program requires the ncurses library\n");
    ExitProgram(EXIT_FAILURE);
}
#endif