scripts/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  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include "dialog.h"
  11
  12 /*
  13  * Display termination buttons
  14  */
  15 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
  16 {
  17         int x = width / 2 - 10;
  18         int y = height - 2;
  19
  20         print_button(dialog, gettext(" Yes "), y, x, selected == 0);
  21         print_button(dialog, gettext("  No  "), y, x + 13, selected == 1);
  22
  23         wmove(dialog, y, x + 1 + 13 * selected);
  24         wrefresh(dialog);
  25 }
  26
  27 /*
  28  * Display a dialog box with two buttons - Yes and No
  29  */
  30 int dialog_yesno(const char *title, const char *prompt, int height, int width)
  31 {
  32         int i, x, y, key = 0, button = 0;
  33         WINDOW *dialog;
  34
  35 do_resize:
  36         if (getmaxy(stdscr) < (height + YESNO_HEIGTH_MIN))
  37                 return -ERRDISPLAYTOOSMALL;
  38         if (getmaxx(stdscr) < (width + YESNO_WIDTH_MIN))
  39                 return -ERRDISPLAYTOOSMALL;
  40
  41         /* center dialog box on screen */
  42         x = (getmaxx(stdscr) - width) / 2;
  43         y = (getmaxy(stdscr) - height) / 2;
  44
  45         draw_shadow(stdscr, y, x, height, width);
  46
  47         dialog = newwin(height, width, y, x);
  48         keypad(dialog, TRUE);
  49
  50         draw_box(dialog, 0, 0, height, width,
  51                  dlg.dialog.atr, dlg.border.atr);
  52         wattrset(dialog, dlg.border.atr);
  53         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
  54         for (i = 0; i < width - 2; i++)
  55                 waddch(dialog, ACS_HLINE);
  56         wattrset(dialog, dlg.dialog.atr);
  57         waddch(dialog, ACS_RTEE);
  58
  59         print_title(dialog, title, width);
  60
  61         wattrset(dialog, dlg.dialog.atr);
  62         print_autowrap(dialog, prompt, width - 2, 1, 3);
  63
  64         print_buttons(dialog, height, width, 0);
  65
  66         while (key != KEY_ESC) {
  67                 key = wgetch(dialog);
  68                 switch (key) {
  69                 case 'Y':
  70                 case 'y':
  71                         delwin(dialog);
  72                         return 0;
  73                 case 'N':
  74                 case 'n':
  75                         delwin(dialog);
  76                         return 1;
  77
  78                 case TAB:
  79                 case KEY_LEFT:
  80                 case KEY_RIGHT:
  81                         button = ((key == KEY_LEFT ? --button : ++button) < 0) ? 1 : (button > 1 ? 0 : button);
  82
  83                         print_buttons(dialog, height, width, button);
  84                         wrefresh(dialog);
  85                         break;
  86                 case ' ':
  87                 case '\n':
  88                         delwin(dialog);
  89                         return button;
  90                 case KEY_ESC:
  91                         key = on_key_esc(dialog);
  92                         break;
  93                 case KEY_RESIZE:
  94                         delwin(dialog);
  95                         on_key_resize();
  96                         goto do_resize;
  97                 }
  98         }
  99
 100         delwin(dialog);
 101         return key;             /* ESC pressed */
 102 }