lxdialog/inputbox.c

   1 /*
   2  *  inputbox.c -- implements the input 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  *  This program is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU General Public License
   9  *  as published by the Free Software Foundation; either version 2
  10  *  of the License, or (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "dialog.h"
  23
  24 unsigned char dialog_input_result[MAX_LEN + 1];
  25
  26 /*
  27  *  Print the termination buttons
  28  */
  29 static void
  30 print_buttons(WINDOW *dialog, int height, int width, int selected)
  31 {
  32     int x = width / 2 - 11;
  33     int y = height - 2;
  34
  35     print_button (dialog, "  Ok  ", y, x, selected==0);
  36     print_button (dialog, " Help ", y, x + 14, selected==1);
  37
  38     wmove(dialog, y, x+1+14*selected);
  39     wrefresh(dialog);
  40 }
  41
  42 /*
  43  * Display a dialog box for inputing a string
  44  */
  45 int
  46 dialog_inputbox (const char *title, const char *prompt, int height, int width,
  47                  const char *init)
  48 {
  49     int i, x, y, box_y, box_x, box_width;
  50     int input_x = 0, scroll = 0, key = 0, button = -1;
  51     unsigned char *instr = dialog_input_result;
  52     WINDOW *dialog;
  53
  54     /* center dialog box on screen */
  55     x = (COLS - width) / 2;
  56     y = (LINES - height) / 2;
  57
  58
  59     draw_shadow (stdscr, y, x, height, width);
  60
  61     dialog = newwin (height, width, y, x);
  62     keypad (dialog, TRUE);
  63
  64     draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
  65     wattrset (dialog, border_attr);
  66     mvwaddch (dialog, height-3, 0, ACS_LTEE);
  67     for (i = 0; i < width - 2; i++)
  68         waddch (dialog, ACS_HLINE);
  69     wattrset (dialog, dialog_attr);
  70     waddch (dialog, ACS_RTEE);
  71
  72     if (title != NULL && strlen(title) >= width-2 ) {
  73         /* truncate long title -- mec */
  74         char * title2 = malloc(width-2+1);
  75         memcpy( title2, title, width-2 );
  76         title2[width-2] = '\0';
  77         title = title2;
  78     }
  79
  80     if (title != NULL) {
  81         wattrset (dialog, title_attr);
  82         mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
  83         waddstr (dialog, (char *)title);
  84         waddch (dialog, ' ');
  85     }
  86
  87     wattrset (dialog, dialog_attr);
  88     print_autowrap (dialog, prompt, width - 2, 1, 3);
  89
  90     /* Draw the input field box */
  91     box_width = width - 6;
  92     getyx (dialog, y, x);
  93     box_y = y + 2;
  94     box_x = (width - box_width) / 2;
  95     draw_box (dialog, y + 1, box_x - 1, 3, box_width + 2,
  96               border_attr, dialog_attr);
  97
  98     print_buttons(dialog, height, width, 0);
  99
 100     /* Set up the initial value */
 101     wmove (dialog, box_y, box_x);
 102     wattrset (dialog, inputbox_attr);
 103
 104     if (!init)
 105         instr[0] = '\0';
 106     else
 107         strcpy (instr, init);
 108
 109     input_x = strlen (instr);
 110
 111     if (input_x >= box_width) {
 112         scroll = input_x - box_width + 1;
 113         input_x = box_width - 1;
 114         for (i = 0; i < box_width - 1; i++)
 115             waddch (dialog, instr[scroll + i]);
 116     } else
 117         waddstr (dialog, instr);
 118
 119     wmove (dialog, box_y, box_x + input_x);
 120
 121     wrefresh (dialog);
 122
 123     while (key != ESC) {
 124         key = wgetch (dialog);
 125
 126         if (button == -1) {     /* Input box selected */
 127             switch (key) {
 128             case TAB:
 129             case KEY_UP:
 130             case KEY_DOWN:
 131                 break;
 132             case KEY_LEFT:
 133                 continue;
 134             case KEY_RIGHT:
 135                 continue;
 136             case KEY_BACKSPACE:
 137             case 127:
 138                 if (input_x || scroll) {
 139                     wattrset (dialog, inputbox_attr);
 140                     if (!input_x) {
 141                         scroll = scroll < box_width - 1 ?
 142                             0 : scroll - (box_width - 1);
 143                         wmove (dialog, box_y, box_x);
 144                         for (i = 0; i < box_width; i++)
 145                             waddch (dialog, instr[scroll + input_x + i] ?
 146                                     instr[scroll + input_x + i] : ' ');
 147                         input_x = strlen (instr) - scroll;
 148                     } else
 149                         input_x--;
 150                     instr[scroll + input_x] = '\0';
 151                     mvwaddch (dialog, box_y, input_x + box_x, ' ');
 152                     wmove (dialog, box_y, input_x + box_x);
 153                     wrefresh (dialog);
 154                 }
 155                 continue;
 156             default:
 157                 if (key < 0x100 && isprint (key)) {
 158                     if (scroll + input_x < MAX_LEN) {
 159                         wattrset (dialog, inputbox_attr);
 160                         instr[scroll + input_x] = key;
 161                         instr[scroll + input_x + 1] = '\0';
 162                         if (input_x == box_width - 1) {
 163                             scroll++;
 164                             wmove (dialog, box_y, box_x);
 165                             for (i = 0; i < box_width - 1; i++)
 166                                 waddch (dialog, instr[scroll + i]);
 167                         } else {
 168                             wmove (dialog, box_y, input_x++ + box_x);
 169                             waddch (dialog, key);
 170                         }
 171                         wrefresh (dialog);
 172                     } else
 173                         flash ();       /* Alarm user about overflow */
 174                     continue;
 175                 }
 176             }
 177         }
 178         switch (key) {
 179         case 'O':
 180         case 'o':
 181             delwin (dialog);
 182             return 0;
 183         case 'H':
 184         case 'h':
 185             delwin (dialog);
 186             return 1;
 187         case KEY_UP:
 188         case KEY_LEFT:
 189             switch (button) {
 190             case -1:
 191                 button = 1;     /* Indicates "Cancel" button is selected */
 192                 print_buttons(dialog, height, width, 1);
 193                 break;
 194             case 0:
 195                 button = -1;    /* Indicates input box is selected */
 196                 print_buttons(dialog, height, width, 0);
 197                 wmove (dialog, box_y, box_x + input_x);
 198                 wrefresh (dialog);
 199                 break;
 200             case 1:
 201                 button = 0;     /* Indicates "OK" button is selected */
 202                 print_buttons(dialog, height, width, 0);
 203                 break;
 204             }
 205             break;
 206         case TAB:
 207         case KEY_DOWN:
 208         case KEY_RIGHT:
 209             switch (button) {
 210             case -1:
 211                 button = 0;     /* Indicates "OK" button is selected */
 212                 print_buttons(dialog, height, width, 0);
 213                 break;
 214             case 0:
 215                 button = 1;     /* Indicates "Cancel" button is selected */
 216                 print_buttons(dialog, height, width, 1);
 217                 break;
 218             case 1:
 219                 button = -1;    /* Indicates input box is selected */
 220                 print_buttons(dialog, height, width, 0);
 221                 wmove (dialog, box_y, box_x + input_x);
 222                 wrefresh (dialog);
 223                 break;
 224             }
 225             break;
 226         case ' ':
 227         case '\n':
 228             delwin (dialog);
 229             return (button == -1 ? 0 : button);
 230         case 'X':
 231         case 'x':
 232             key = ESC;
 233         case ESC:
 234             break;
 235         }
 236     }
 237
 238     delwin (dialog);
 239     return -1;                  /* ESC pressed */
 240 }