scripts/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 char dialog_input_result[MAX_LEN + 1];
  25
  26 /*
  27  *  Print the termination buttons
  28  */
  29 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
  30 {
  31         int x = width / 2 - 11;
  32         int y = height - 2;
  33
  34         print_button(dialog, "  Ok  ", y, x, selected == 0);
  35         print_button(dialog, " Help ", y, x + 14, selected == 1);
  36
  37         wmove(dialog, y, x + 1 + 14 * selected);
  38         wrefresh(dialog);
  39 }
  40
  41 /*
  42  * Display a dialog box for inputing a string
  43  */
  44 int dialog_inputbox(const char *title, const char *prompt, int height, int width,
  45                     const char *init)
  46 {
  47         int i, x, y, box_y, box_x, box_width;
  48         int input_x = 0, scroll = 0, key = 0, button = -1;
  49         char *instr = dialog_input_result;
  50         WINDOW *dialog;
  51
  52         /* center dialog box on screen */
  53         x = (COLS - width) / 2;
  54         y = (LINES - height) / 2;
  55
  56         draw_shadow(stdscr, y, x, height, width);
  57
  58         dialog = newwin(height, width, y, x);
  59         keypad(dialog, TRUE);
  60
  61         draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
  62         wattrset(dialog, border_attr);
  63         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
  64         for (i = 0; i < width - 2; i++)
  65                 waddch(dialog, ACS_HLINE);
  66         wattrset(dialog, dialog_attr);
  67         waddch(dialog, ACS_RTEE);
  68
  69         if (title != NULL && strlen(title) >= width - 2) {
  70                 /* truncate long title -- mec */
  71                 char *title2 = malloc(width - 2 + 1);
  72                 memcpy(title2, title, width - 2);
  73                 title2[width - 2] = '\0';
  74                 title = title2;
  75         }
  76
  77         if (title != NULL) {
  78                 wattrset(dialog, title_attr);
  79                 mvwaddch(dialog, 0, (width - strlen(title)) / 2 - 1, ' ');
  80                 waddstr(dialog, (char *)title);
  81                 waddch(dialog, ' ');
  82         }
  83
  84         wattrset(dialog, dialog_attr);
  85         print_autowrap(dialog, prompt, width - 2, 1, 3);
  86
  87         /* Draw the input field box */
  88         box_width = width - 6;
  89         getyx(dialog, y, x);
  90         box_y = y + 2;
  91         box_x = (width - box_width) / 2;
  92         draw_box(dialog, y + 1, box_x - 1, 3, box_width + 2, border_attr, dialog_attr);
  93
  94         print_buttons(dialog, height, width, 0);
  95
  96         /* Set up the initial value */
  97         wmove(dialog, box_y, box_x);
  98         wattrset(dialog, inputbox_attr);
  99
 100         if (!init)
 101                 instr[0] = '\0';
 102         else
 103                 strcpy(instr, init);
 104
 105         input_x = strlen(instr);
 106
 107         if (input_x >= box_width) {
 108                 scroll = input_x - box_width + 1;
 109                 input_x = box_width - 1;
 110                 for (i = 0; i < box_width - 1; i++)
 111                         waddch(dialog, instr[scroll + i]);
 112         } else {
 113                 waddstr(dialog, instr);
 114         }
 115
 116         wmove(dialog, box_y, box_x + input_x);
 117
 118         wrefresh(dialog);
 119
 120         while (key != ESC) {
 121                 key = wgetch(dialog);
 122
 123                 if (button == -1) {     /* Input box selected */
 124                         switch (key) {
 125                         case TAB:
 126                         case KEY_UP:
 127                         case KEY_DOWN:
 128                                 break;
 129                         case KEY_LEFT:
 130                                 continue;
 131                         case KEY_RIGHT:
 132                                 continue;
 133                         case KEY_BACKSPACE:
 134                         case 127:
 135                                 if (input_x || scroll) {
 136                                         wattrset(dialog, inputbox_attr);
 137                                         if (!input_x) {
 138                                                 scroll = scroll < box_width - 1 ? 0 : scroll - (box_width - 1);
 139                                                 wmove(dialog, box_y, box_x);
 140                                                 for (i = 0; i < box_width; i++)
 141                                                         waddch(dialog,
 142                                                                instr[scroll + input_x + i] ?
 143                                                                instr[scroll + input_x + i] : ' ');
 144                                                 input_x = strlen(instr) - scroll;
 145                                         } else
 146                                                 input_x--;
 147                                         instr[scroll + input_x] = '\0';
 148                                         mvwaddch(dialog, box_y, input_x + box_x, ' ');
 149                                         wmove(dialog, box_y, input_x + box_x);
 150                                         wrefresh(dialog);
 151                                 }
 152                                 continue;
 153                         default:
 154                                 if (key < 0x100 && isprint(key)) {
 155                                         if (scroll + input_x < MAX_LEN) {
 156                                                 wattrset(dialog, inputbox_attr);
 157                                                 instr[scroll + input_x] = key;
 158                                                 instr[scroll + input_x + 1] = '\0';
 159                                                 if (input_x == box_width - 1) {
 160                                                         scroll++;
 161                                                         wmove(dialog, box_y, box_x);
 162                                                         for (i = 0; i < box_width - 1; i++)
 163                                                                 waddch(dialog, instr [scroll + i]);
 164                                                 } else {
 165                                                         wmove(dialog, box_y, input_x++ + box_x);
 166                                                         waddch(dialog, key);
 167                                                 }
 168                                                 wrefresh(dialog);
 169                                         } else
 170                                                 flash();        /* Alarm user about overflow */
 171                                         continue;
 172                                 }
 173                         }
 174                 }
 175                 switch (key) {
 176                 case 'O':
 177                 case 'o':
 178                         delwin(dialog);
 179                         return 0;
 180                 case 'H':
 181                 case 'h':
 182                         delwin(dialog);
 183                         return 1;
 184                 case KEY_UP:
 185                 case KEY_LEFT:
 186                         switch (button) {
 187                         case -1:
 188                                 button = 1;     /* Indicates "Cancel" button is selected */
 189                                 print_buttons(dialog, height, width, 1);
 190                                 break;
 191                         case 0:
 192                                 button = -1;    /* Indicates input box is selected */
 193                                 print_buttons(dialog, height, width, 0);
 194                                 wmove(dialog, box_y, box_x + input_x);
 195                                 wrefresh(dialog);
 196                                 break;
 197                         case 1:
 198                                 button = 0;     /* Indicates "OK" button is selected */
 199                                 print_buttons(dialog, height, width, 0);
 200                                 break;
 201                         }
 202                         break;
 203                 case TAB:
 204                 case KEY_DOWN:
 205                 case KEY_RIGHT:
 206                         switch (button) {
 207                         case -1:
 208                                 button = 0;     /* Indicates "OK" button is selected */
 209                                 print_buttons(dialog, height, width, 0);
 210                                 break;
 211                         case 0:
 212                                 button = 1;     /* Indicates "Cancel" button is selected */
 213                                 print_buttons(dialog, height, width, 1);
 214                                 break;
 215                         case 1:
 216                                 button = -1;    /* Indicates input box is selected */
 217                                 print_buttons(dialog, height, width, 0);
 218                                 wmove(dialog, box_y, box_x + input_x);
 219                                 wrefresh(dialog);
 220                                 break;
 221                         }
 222                         break;
 223                 case ' ':
 224                 case '\n':
 225                         delwin(dialog);
 226                         return (button == -1 ? 0 : button);
 227                 case 'X':
 228                 case 'x':
 229                         key = ESC;
 230                 case ESC:
 231                         break;
 232                 }
 233         }
 234
 235         delwin(dialog);
 236         return -1;              /* ESC pressed */
 237 }