yesno.c revision 72986 
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
21#ifndef lint
22static const char rcsid[] = "$FreeBSD: head/gnu/lib/libdialog/yesno.c 72986 2001-02-24 18:52:56Z jkh $";
23#endif
24
25#include <dialog.h>
26#include "dialog.priv.h"
27
28/* Actual work function */
29static int dialog_yesno_proc(unsigned char *title, unsigned char *prompt,
30			     int height, int width, int yesdefault);
31
32/*
33 * Display a dialog box with two buttons - Yes and No
34 */
35int
36dialog_yesno(unsigned char *title, unsigned char *prompt, int height, int width)
37{
38  return dialog_yesno_proc(title, prompt, height, width, TRUE);
39}
40
41/*
42 * Display a dialog box with two buttons - No and Yes
43 */
44int
45dialog_noyes(unsigned char *title, unsigned char *prompt, int height, int width)
46{
47  return dialog_yesno_proc(title, prompt, height, width, FALSE);
48}
49
50static int
51dialog_yesno_proc(unsigned char *title, unsigned char *prompt, int height, int width, int yesdefault)
52{
53  int i, j, x, y, key, button;
54  WINDOW *dialog;
55  char *tmphlp;
56
57  /* disable helpline */
58  tmphlp = get_helpline();
59  use_helpline(NULL);
60
61  if (height < 0)
62	height = strheight(prompt)+4;
63  if (width < 0) {
64	i = strwidth(prompt);
65	j = ((title != NULL) ? strwidth(title) : 0);
66	width = MAX(i,j)+4;
67  }
68  width = MAX(width,23);
69
70  if (width > COLS)
71	width = COLS;
72  if (height > LINES)
73	height = LINES;
74  /* center dialog box on screen */
75  x = DialogX ? DialogX : (COLS - width)/2;
76  y = DialogY ? DialogY : (LINES - height)/2;
77
78#ifdef HAVE_NCURSES
79  if (use_shadow)
80    draw_shadow(stdscr, y, x, height, width);
81#endif
82  dialog = newwin(height, width, y, x);
83  if (dialog == NULL) {
84    endwin();
85    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
86    exit(1);
87  }
88  keypad(dialog, TRUE);
89
90  draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
91  wattrset(dialog, border_attr);
92  wmove(dialog, height-3, 0);
93  waddch(dialog, ACS_LTEE);
94  for (i = 0; i < width-2; i++)
95    waddch(dialog, ACS_HLINE);
96  wattrset(dialog, dialog_attr);
97  waddch(dialog, ACS_RTEE);
98  wmove(dialog, height-2, 1);
99  for (i = 0; i < width-2; i++)
100    waddch(dialog, ' ');
101
102  if (title != NULL) {
103    wattrset(dialog, title_attr);
104    wmove(dialog, 0, (width - strlen(title))/2 - 1);
105    waddch(dialog, ' ');
106    waddstr(dialog, title);
107    waddch(dialog, ' ');
108  }
109  wattrset(dialog, dialog_attr);
110  wmove(dialog, 1, 2);
111  print_autowrap(dialog, prompt, height-1, width-2, width, 1, 2, TRUE, FALSE);
112
113  display_helpline(dialog, height-1, width);
114
115  x = width/2-10;
116  y = height-2;
117
118  /* preset button 0 or 1 for YES or NO as the default */
119  key = 0;
120  button = !yesdefault;
121  while (key != ESC) {
122    print_button(dialog, "  No  ", y, x+13, button);
123    print_button(dialog, " Yes " , y, x, !button);
124    wrefresh(dialog);
125
126    key = wgetch(dialog);
127    switch (key) {
128      case 'Y':
129      case 'y':
130        delwin(dialog);
131	restore_helpline(tmphlp);
132        return 0;
133      case 'N':
134      case 'n':
135        delwin(dialog);
136	restore_helpline(tmphlp);
137        return 1;
138      case KEY_BTAB:
139      case TAB:
140      case KEY_UP:
141      case KEY_DOWN:
142      case KEY_LEFT:
143      case KEY_RIGHT:
144        button = !button;
145        /* redrawn at the loop's entry */
146        break;
147      case ' ':
148      case '\r':
149      case '\n':
150        delwin(dialog);
151	restore_helpline(tmphlp);
152        return button;
153      case ESC:
154        break;
155    case KEY_F(1):
156    case '?':
157	display_helpfile();
158	break;
159    }
160  }
161
162  delwin(dialog);
163  restore_helpline(tmphlp);
164  return -1;    /* ESC pressed */
165}
166/* End of dialog_yesno() */
167