scripts/kconfig/lxdialog/yesno.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  yesno.c -- implements the yes/no box
   4  *
   5  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   6  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
   7  */
   8
   9 #include "dialog.h"
  10
  11 /*
  12  * Display termination buttons
  13  */
  14 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
  15 {
  16         int x = width / 2 - 10;
  17         int y = height - 2;
  18
  19         print_button(dialog, " Yes ", y, x, selected == 0);
  20         print_button(dialog, "  No  ", y, x + 13, selected == 1);
  21
  22         wmove(dialog, y, x + 1 + 13 * selected);
  23         wrefresh(dialog);
  24 }
  25
  26 /*
  27  * Display a dialog box with two buttons - Yes and No
  28  */
  29 int dialog_yesno(const char *title, const char *prompt, int height, int width)
  30 {
  31         int i, x, y, key = 0, button = 0;
  32         WINDOW *dialog;
  33
  34 do_resize:
  35         if (getmaxy(stdscr) < (height + YESNO_HEIGTH_MIN))
  36                 return -ERRDISPLAYTOOSMALL;
  37         if (getmaxx(stdscr) < (width + YESNO_WIDTH_MIN))
  38                 return -ERRDISPLAYTOOSMALL;
  39
  40         /* center dialog box on screen */
  41         x = (getmaxx(stdscr) - width) / 2;
  42         y = (getmaxy(stdscr) - height) / 2;
  43
  44         draw_shadow(stdscr, y, x, height, width);
  45
  46         dialog = newwin(height, width, y, x);
  47         keypad(dialog, TRUE);
  48
  49         draw_box(dialog, 0, 0, height, width,
  50                  dlg.dialog.atr, dlg.border.atr);
  51         wattrset(dialog, dlg.border.atr);
  52         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
  53         for (i = 0; i < width - 2; i++)
  54                 waddch(dialog, ACS_HLINE);
  55         wattrset(dialog, dlg.dialog.atr);
  56         waddch(dialog, ACS_RTEE);
  57
  58         print_title(dialog, title, width);
  59
  60         wattrset(dialog, dlg.dialog.atr);
  61         print_autowrap(dialog, prompt, width - 2, 1, 3);
  62
  63         print_buttons(dialog, height, width, 0);
  64
  65         while (key != KEY_ESC) {
  66                 key = wgetch(dialog);
  67                 switch (key) {
  68                 case 'Y':
  69                 case 'y':
  70                         delwin(dialog);
  71                         return 0;
  72                 case 'N':
  73                 case 'n':
  74                         delwin(dialog);
  75                         return 1;
  76
  77                 case TAB:
  78                 case KEY_LEFT:
  79                 case KEY_RIGHT:
  80                         button = ((key == KEY_LEFT ? --button : ++button) < 0) ? 1 : (button > 1 ? 0 : button);
  81
  82                         print_buttons(dialog, height, width, button);
  83                         wrefresh(dialog);
  84                         break;
  85                 case ' ':
  86                 case '\n':
  87                         delwin(dialog);
  88                         return button;
  89                 case KEY_ESC:
  90                         key = on_key_esc(dialog);
  91                         break;
  92                 case KEY_RESIZE:
  93                         delwin(dialog);
  94                         on_key_resize();
  95                         goto do_resize;
  96                 }
  97         }
  98
  99         delwin(dialog);
 100         return key;             /* ESC pressed */
 101 }