Function curs_scroll_invt

win/curses/cursinvt.c:135–260

scroll persistent inventory window forwards or backwards or side-to-side */

/* scroll persistent inventory window forwards or backwards or side-to-side */
static int
curs_scroll_invt(WINDOW *win UNUSED)
{
    char menukeys[QBUFSZ], qbuf[QBUFSZ];
    unsigned uheight, uwidth, uhalfwidth, scrlmask;
    int ch, menucmd, height, width;
    int res = 0;

    curses_get_window_size(INV_WIN, &height, &width);
    uheight    = (unsigned) height;
    uwidth     = (unsigned) width;
    uhalfwidth = uwidth / 2;

    menukeys[0] = '\0';
    scrlmask = 0U;
    if (pi.rowoffset > 0)
        scrlmask |= 1U; /* include scroll backwards: ^ and < */
    if (pi.rowoffset + uheight <= pi.inuseindx)
        scrlmask |= 2U; /* include scroll forwards: > and | */
    if (pi.coloffset > 0)
        scrlmask |= 4U; /* include scroll left: { */
    if (pi.widest > pi.coloffset + uwidth)
        scrlmask |= 8U; /* include scroll right: } */
    (void) collect_menu_keys(menukeys, scrlmask, TRUE);

    Snprintf(qbuf, sizeof qbuf, "Inventory scroll: [%s%s%s] ",
             menukeys, *menukeys ? " " : "", "Ret Esc");

    curses_count_window(qbuf);
    ch = getch();
    curses_count_window((char *) 0);
    curses_clear_unhighlight_message_window();

    menucmd = (ch <= 0 || ch >= 255) ? ch : (int) (uchar) map_menu_cmd(ch);
    switch (menucmd) {
    case KEY_ESC:
    case C('c'): /* ^C */
        /* for <escape>, leave window with scrolling as-is */
        res = -1;
        break;
    case '\n':
    case '\r':
    case '\b':
    case '\177':
        /* for <return>, or <space> when already on last page,
           restore window to unscrolled */
        pi.rowoffset = pi.coloffset = 0;
        res = 1;
        break;
    case ' ':
        if (pi.rowoffset + uheight <= pi.inuseindx) {
            pi.rowoffset = pi.coloffset = 0;
            res = 1;
            break;
        }
        FALLTHROUGH;
        /*FALLTHRU*/
    case KEY_RIGHT: