gnu/lib/libdialog/yesno.c

   1 /*
   2  *  yesno.c -- implements the yes/no box
   3  *
   4  *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version 2
   9  *  of the License, or (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  * $FreeBSD: src/gnu/lib/libdialog/yesno.c,v 1.11.8.3 2001/07/31 20:34:00 eric Exp $
  21  * $DragonFly: src/gnu/lib/libdialog/yesno.c,v 1.2 2003/06/17 04:25:43 dillon Exp $
  22  */
  23
  24 #include <dialog.h>
  25 #include "dialog.priv.h"
  26
  27 /* Actual work function */
  28 static int dialog_yesno_proc(unsigned char *title, unsigned char *prompt,
  29                              int height, int width, int yesdefault);
  30
  31 /*
  32  * Display a dialog box with two buttons - Yes and No
  33  */
  34 int
  35 dialog_yesno(unsigned char *title, unsigned char *prompt, int height, int width)
  36 {
  37   return dialog_yesno_proc(title, prompt, height, width, TRUE);
  38 }
  39
  40 /*
  41  * Display a dialog box with two buttons - No and Yes
  42  */
  43 int
  44 dialog_noyes(unsigned char *title, unsigned char *prompt, int height, int width)
  45 {
  46   return dialog_yesno_proc(title, prompt, height, width, FALSE);
  47 }
  48
  49 static int
  50 dialog_yesno_proc(unsigned char *title, unsigned char *prompt, int height, int width, int yesdefault)
  51 {
  52   int i, j, x, y, key, button;
  53   WINDOW *dialog;
  54   char *tmphlp;
  55
  56   /* disable helpline */
  57   tmphlp = get_helpline();
  58   use_helpline(NULL);
  59
  60   if (height < 0)
  61         height = strheight(prompt)+4;
  62   if (width < 0) {
  63         i = strwidth(prompt);
  64         j = ((title != NULL) ? strwidth(title) : 0);
  65         width = MAX(i,j)+4;
  66   }
  67   width = MAX(width,23);
  68
  69   if (width > COLS)
  70         width = COLS;
  71   if (height > LINES)
  72         height = LINES;
  73   /* center dialog box on screen */
  74   x = DialogX ? DialogX : (COLS - width)/2;
  75   y = DialogY ? DialogY : (LINES - height)/2;
  76
  77 #ifdef HAVE_NCURSES
  78   if (use_shadow)
  79     draw_shadow(stdscr, y, x, height, width);
  80 #endif
  81   dialog = newwin(height, width, y, x);
  82   if (dialog == NULL) {
  83     endwin();
  84     fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
  85     exit(1);
  86   }
  87   keypad(dialog, TRUE);
  88
  89   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
  90   wattrset(dialog, border_attr);
  91   wmove(dialog, height-3, 0);
  92   waddch(dialog, ACS_LTEE);
  93   for (i = 0; i < width-2; i++)
  94     waddch(dialog, ACS_HLINE);
  95   wattrset(dialog, dialog_attr);
  96   waddch(dialog, ACS_RTEE);
  97   wmove(dialog, height-2, 1);
  98   for (i = 0; i < width-2; i++)
  99     waddch(dialog, ' ');
 100
 101   if (title != NULL) {
 102     wattrset(dialog, title_attr);
 103     wmove(dialog, 0, (width - strlen(title))/2 - 1);
 104     waddch(dialog, ' ');
 105     waddstr(dialog, title);
 106     waddch(dialog, ' ');
 107   }
 108   wattrset(dialog, dialog_attr);
 109   wmove(dialog, 1, 2);
 110   print_autowrap(dialog, prompt, height-1, width-2, width, 1, 2, TRUE, FALSE);
 111
 112   display_helpline(dialog, height-1, width);
 113
 114   x = width/2-10;
 115   y = height-2;
 116
 117   /* preset button 0 or 1 for YES or NO as the default */
 118   key = 0;
 119   button = !yesdefault;
 120   while (key != ESC) {
 121     print_button(dialog, "  No  ", y, x+13, button);
 122     print_button(dialog, " Yes " , y, x, !button);
 123     if (button)
 124         wmove(dialog, y, x+16);
 125     else
 126         wmove(dialog, y, x+2);
 127     wrefresh(dialog);
 128
 129     key = wgetch(dialog);
 130     switch (key) {
 131       case 'Y':
 132       case 'y':
 133         delwin(dialog);
 134         restore_helpline(tmphlp);
 135         return 0;
 136       case 'N':
 137       case 'n':
 138         delwin(dialog);
 139         restore_helpline(tmphlp);
 140         return 1;
 141       case KEY_BTAB:
 142       case TAB:
 143       case KEY_UP:
 144       case KEY_DOWN:
 145       case KEY_LEFT:
 146       case KEY_RIGHT:
 147         button = !button;
 148         /* redrawn at the loop's entry */
 149         break;
 150       case ' ':
 151       case '\r':
 152       case '\n':
 153         delwin(dialog);
 154         restore_helpline(tmphlp);
 155         return button;
 156       case ESC:
 157         break;
 158     case KEY_F(1):
 159     case '?':
 160         display_helpfile();
 161         break;
 162     }
 163   }
 164
 165   delwin(dialog);
 166   restore_helpline(tmphlp);
 167   return -1;    /* ESC pressed */
 168 }
 169 /* End of dialog_yesno() */