yesno.c revision 114603 
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#include <sys/cdefs.h>
22__FBSDID("$FreeBSD: head/gnu/lib/libdialog/yesno.c 114603 2003-05-03 21:31:08Z obrien $");
23
24#include <dialog.h>
25#include "dialog.priv.h"
26
27/* Actual work function */
28static 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 */
34int
35dialog_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 */
43int
44dialog_noyes(unsigned char *title, unsigned char *prompt, int height, int width)
45{
46  return dialog_yesno_proc(title, prompt, height, width, FALSE);
47}
48
49static int
50dialog_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() */
170