support/kconfig/lxdialog/yesno.c

   1 /*
   2  *  yesno.c -- implements the yes/no box
   3  *
   4  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   5  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
   6  *
   7  *  This program is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU General Public License
   9  *  as published by the Free Software Foundation; either version 2
  10  *  of the License, or (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "dialog.h"
  23
  24 /*
  25  * Display termination buttons
  26  */
  27 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
  28 {
  29         int x = width / 2 - 10;
  30         int y = height - 2;
  31
  32         print_button(dialog, gettext(" Yes "), y, x, selected == 0);
  33         print_button(dialog, gettext("  No  "), y, x + 13, selected == 1);
  34
  35         wmove(dialog, y, x + 1 + 13 * selected);
  36         wrefresh(dialog);
  37 }
  38
  39 /*
  40  * Display a dialog box with two buttons - Yes and No
  41  */
  42 int dialog_yesno(const char *title, const char *prompt, int height, int width)
  43 {
  44         int i, x, y, key = 0, button = 0;
  45         WINDOW *dialog;
  46
  47 do_resize:
  48         if (getmaxy(stdscr) < (height + YESNO_HEIGTH_MIN))
  49                 return -ERRDISPLAYTOOSMALL;
  50         if (getmaxx(stdscr) < (width + YESNO_WIDTH_MIN))
  51                 return -ERRDISPLAYTOOSMALL;
  52
  53         /* center dialog box on screen */
  54         x = (getmaxx(stdscr) - width) / 2;
  55         y = (getmaxy(stdscr) - height) / 2;
  56
  57         draw_shadow(stdscr, y, x, height, width);
  58
  59         dialog = newwin(height, width, y, x);
  60         keypad(dialog, TRUE);
  61
  62         draw_box(dialog, 0, 0, height, width,
  63                  dlg.dialog.atr, dlg.border.atr);
  64         wattrset(dialog, dlg.border.atr);
  65         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
  66         for (i = 0; i < width - 2; i++)
  67                 waddch(dialog, ACS_HLINE);
  68         wattrset(dialog, dlg.dialog.atr);
  69         waddch(dialog, ACS_RTEE);
  70
  71         print_title(dialog, title, width);
  72
  73         wattrset(dialog, dlg.dialog.atr);
  74         print_autowrap(dialog, prompt, width - 2, 1, 3);
  75
  76         print_buttons(dialog, height, width, 0);
  77
  78         while (key != KEY_ESC) {
  79                 key = wgetch(dialog);
  80                 switch (key) {
  81                 case 'Y':
  82                 case 'y':
  83                         delwin(dialog);
  84                         return 0;
  85                 case 'N':
  86                 case 'n':
  87                         delwin(dialog);
  88                         return 1;
  89
  90                 case TAB:
  91                 case KEY_LEFT:
  92                 case KEY_RIGHT:
  93                         button = ((key == KEY_LEFT ? --button : ++button) < 0) ? 1 : (button > 1 ? 0 : button);
  94
  95                         print_buttons(dialog, height, width, button);
  96                         wrefresh(dialog);
  97                         break;
  98                 case ' ':
  99                 case '\n':
 100                         delwin(dialog);
 101                         return button;
 102                 case KEY_ESC:
 103                         key = on_key_esc(dialog);
 104                         break;
 105                 case KEY_RESIZE:
 106                         delwin(dialog);
 107                         on_key_resize();
 108                         goto do_resize;
 109                 }
 110         }
 111
 112         delwin(dialog);
 113         return key;             /* ESC pressed */
 114 }