source: menu/lxdialog/yesno.c@ 6feeca3

/*
 *  yesno.c -- implements the yes/no box
 *
 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "dialog.h"

/*
 * Display termination buttons
 */
static void
print_buttons(WINDOW *dialog, int height, int width, int selected)
{
    int x = width / 2 - 10;
    int y = height - 2;

    print_button (dialog, " Yes ", y, x, selected == 0);
    print_button (dialog, "  No  ", y, x + 13, selected == 1);

    wmove(dialog, y, x+1 + 13*selected );
    wrefresh (dialog);
}

/*
 * Display a dialog box with two buttons - Yes and No
 */
int
dialog_yesno (const char *title, const char *prompt, int height, int width)
{
    int i, x, y, key = 0, button = 0;
    WINDOW *dialog;

    /* center dialog box on screen */
    x = (COLS - width) / 2;
    y = (LINES - height) / 2;

    draw_shadow (stdscr, y, x, height, width);

    dialog = newwin (height, width, y, x);
    keypad (dialog, TRUE);

    draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
    wattrset (dialog, border_attr);
    mvwaddch (dialog, height-3, 0, ACS_LTEE);
    for (i = 0; i < width - 2; i++)
        waddch (dialog, ACS_HLINE);
    wattrset (dialog, dialog_attr);
    waddch (dialog, ACS_RTEE);

    if (title != NULL && strlen(title) >= width-2 ) {
        /* truncate long title -- mec */
        char * title2 = malloc(width-2+1);
        memcpy( title2, title, width-2 );
        title2[width-2] = '\0';
        title = title2;
    }

    if (title != NULL) {
        wattrset (dialog, title_attr);
        mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
        waddstr (dialog, (char *)title);
        waddch (dialog, ' ');
    }

    wattrset (dialog, dialog_attr);
    print_autowrap (dialog, prompt, width - 2, 1, 3);

    print_buttons(dialog, height, width, 0);

    while (key != ESC) {
        key = wgetch (dialog);
        switch (key) {
        case 'Y':
        case 'y':
            delwin (dialog);
            return 0;
        case 'N':
        case 'n':
            delwin (dialog);
            return 1;

        case TAB:
        case KEY_LEFT:
        case KEY_RIGHT:
            button = ((key == KEY_LEFT ? --button : ++button) < 0)
                        ? 1 : (button > 1 ? 0 : button);

            print_buttons(dialog, height, width, button);
            wrefresh (dialog);
            break;
        case ' ':
        case '\n':
            delwin (dialog);
            return button;
        case ESC:
            break;
        }
    }

    delwin (dialog);
    return -1;                  /* ESC pressed */
}