support/kconfig/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, gettext("  Ok  "), y, x, selected == 0);
  35         print_button(dialog, gettext(" 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, key = 0, button = -1;
  49         int show_x, len, pos;
  50         char *instr = dialog_input_result;
  51         WINDOW *dialog;
  52
  53         if (!init)
  54                 instr[0] = '\0';
  55         else
  56                 strcpy(instr, init);
  57
  58 do_resize:
  59         if (getmaxy(stdscr) <= (height - INPUTBOX_HEIGTH_MIN))
  60                 return -ERRDISPLAYTOOSMALL;
  61         if (getmaxx(stdscr) <= (width - INPUTBOX_WIDTH_MIN))
  62                 return -ERRDISPLAYTOOSMALL;
  63
  64         /* center dialog box on screen */
  65         x = (getmaxx(stdscr) - width) / 2;
  66         y = (getmaxy(stdscr) - height) / 2;
  67
  68         draw_shadow(stdscr, y, x, height, width);
  69
  70         dialog = newwin(height, width, y, x);
  71         keypad(dialog, TRUE);
  72
  73         draw_box(dialog, 0, 0, height, width,
  74                  dlg.dialog.atr, dlg.border.atr);
  75         wattrset(dialog, dlg.border.atr);
  76         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
  77         for (i = 0; i < width - 2; i++)
  78                 waddch(dialog, ACS_HLINE);
  79         wattrset(dialog, dlg.dialog.atr);
  80         waddch(dialog, ACS_RTEE);
  81
  82         print_title(dialog, title, width);
  83
  84         wattrset(dialog, dlg.dialog.atr);
  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,
  93                  dlg.dialog.atr, dlg.border.atr);
  94
  95         print_buttons(dialog, height, width, 0);
  96
  97         /* Set up the initial value */
  98         wmove(dialog, box_y, box_x);
  99         wattrset(dialog, dlg.inputbox.atr);
 100
 101         len = strlen(instr);
 102         pos = len;
 103
 104         if (len >= box_width) {
 105                 show_x = len - box_width + 1;
 106                 input_x = box_width - 1;
 107                 for (i = 0; i < box_width - 1; i++)
 108                         waddch(dialog, instr[show_x + i]);
 109         } else {
 110                 show_x = 0;
 111                 input_x = len;
 112                 waddstr(dialog, instr);
 113         }
 114
 115         wmove(dialog, box_y, box_x + input_x);
 116
 117         wrefresh(dialog);
 118
 119         while (key != KEY_ESC) {
 120                 key = wgetch(dialog);
 121
 122                 if (button == -1) {     /* Input box selected */
 123                         switch (key) {
 124                         case TAB:
 125                         case KEY_UP:
 126                         case KEY_DOWN:
 127                                 break;
 128                         case KEY_BACKSPACE:
 129                         case 127:
 130                                 if (pos) {
 131                                         wattrset(dialog, dlg.inputbox.atr);
 132                                         if (input_x == 0) {
 133                                                 show_x--;
 134                                         } else
 135                                                 input_x--;
 136
 137                                         if (pos < len) {
 138                                                 for (i = pos - 1; i < len; i++) {
 139                                                         instr[i] = instr[i+1];
 140                                                 }
 141                                         }
 142
 143                                         pos--;
 144                                         len--;
 145                                         instr[len] = '\0';
 146                                         wmove(dialog, box_y, box_x);
 147                                         for (i = 0; i < box_width; i++) {
 148                                                 if (!instr[show_x + i]) {
 149                                                         waddch(dialog, ' ');
 150                                                         break;
 151                                                 }
 152                                                 waddch(dialog, instr[show_x + i]);
 153                                         }
 154                                         wmove(dialog, box_y, input_x + box_x);
 155                                         wrefresh(dialog);
 156                                 }
 157                                 continue;
 158                         case KEY_LEFT:
 159                                 if (pos > 0) {
 160                                         if (input_x > 0) {
 161                                                 wmove(dialog, box_y, --input_x + box_x);
 162                                         } else if (input_x == 0) {
 163                                                 show_x--;
 164                                                 wmove(dialog, box_y, box_x);
 165                                                 for (i = 0; i < box_width; i++) {
 166                                                         if (!instr[show_x + i]) {
 167                                                                 waddch(dialog, ' ');
 168                                                                 break;
 169                                                         }
 170                                                         waddch(dialog, instr[show_x + i]);
 171                                                 }
 172                                                 wmove(dialog, box_y, box_x);
 173                                         }
 174                                         pos--;
 175                                 }
 176                                 continue;
 177                         case KEY_RIGHT:
 178                                 if (pos < len) {
 179                                         if (input_x < box_width - 1) {
 180                                                 wmove(dialog, box_y, ++input_x + box_x);
 181                                         } else if (input_x == box_width - 1) {
 182                                                 show_x++;
 183                                                 wmove(dialog, box_y, box_x);
 184                                                 for (i = 0; i < box_width; i++) {
 185                                                         if (!instr[show_x + i]) {
 186                                                                 waddch(dialog, ' ');
 187                                                                 break;
 188                                                         }
 189                                                         waddch(dialog, instr[show_x + i]);
 190                                                 }
 191                                                 wmove(dialog, box_y, input_x + box_x);
 192                                         }
 193                                         pos++;
 194                                 }
 195                                 continue;
 196                         default:
 197                                 if (key < 0x100 && isprint(key)) {
 198                                         if (len < MAX_LEN) {
 199                                                 wattrset(dialog, dlg.inputbox.atr);
 200                                                 if (pos < len) {
 201                                                         for (i = len; i > pos; i--)
 202                                                                 instr[i] = instr[i-1];
 203                                                         instr[pos] = key;
 204                                                 } else {
 205                                                         instr[len] = key;
 206                                                 }
 207                                                 pos++;
 208                                                 len++;
 209                                                 instr[len] = '\0';
 210
 211                                                 if (input_x == box_width - 1) {
 212                                                         show_x++;
 213                                                 } else {
 214                                                         input_x++;
 215                                                 }
 216
 217                                                 wmove(dialog, box_y, box_x);
 218                                                 for (i = 0; i < box_width; i++) {
 219                                                         if (!instr[show_x + i]) {
 220                                                                 waddch(dialog, ' ');
 221                                                                 break;
 222                                                         }
 223                                                         waddch(dialog, instr[show_x + i]);
 224                                                 }
 225                                                 wmove(dialog, box_y, input_x + box_x);
 226                                                 wrefresh(dialog);
 227                                         } else
 228                                                 flash();        /* Alarm user about overflow */
 229                                         continue;
 230                                 }
 231                         }
 232                 }
 233                 switch (key) {
 234                 case 'O':
 235                 case 'o':
 236                         delwin(dialog);
 237                         return 0;
 238                 case 'H':
 239                 case 'h':
 240                         delwin(dialog);
 241                         return 1;
 242                 case KEY_UP:
 243                 case KEY_LEFT:
 244                         switch (button) {
 245                         case -1:
 246                                 button = 1;     /* Indicates "Help" button is selected */
 247                                 print_buttons(dialog, height, width, 1);
 248                                 break;
 249                         case 0:
 250                                 button = -1;    /* Indicates input box is selected */
 251                                 print_buttons(dialog, height, width, 0);
 252                                 wmove(dialog, box_y, box_x + input_x);
 253                                 wrefresh(dialog);
 254                                 break;
 255                         case 1:
 256                                 button = 0;     /* Indicates "OK" button is selected */
 257                                 print_buttons(dialog, height, width, 0);
 258                                 break;
 259                         }
 260                         break;
 261                 case TAB:
 262                 case KEY_DOWN:
 263                 case KEY_RIGHT:
 264                         switch (button) {
 265                         case -1:
 266                                 button = 0;     /* Indicates "OK" button is selected */
 267                                 print_buttons(dialog, height, width, 0);
 268                                 break;
 269                         case 0:
 270                                 button = 1;     /* Indicates "Help" button is selected */
 271                                 print_buttons(dialog, height, width, 1);
 272                                 break;
 273                         case 1:
 274                                 button = -1;    /* Indicates input box is selected */
 275                                 print_buttons(dialog, height, width, 0);
 276                                 wmove(dialog, box_y, box_x + input_x);
 277                                 wrefresh(dialog);
 278                                 break;
 279                         }
 280                         break;
 281                 case ' ':
 282                 case '\n':
 283                         delwin(dialog);
 284                         return (button == -1 ? 0 : button);
 285                 case 'X':
 286                 case 'x':
 287                         key = KEY_ESC;
 288                         break;
 289                 case KEY_ESC:
 290                         key = on_key_esc(dialog);
 291                         break;
 292                 case KEY_RESIZE:
 293                         delwin(dialog);
 294                         on_key_resize();
 295                         goto do_resize;
 296                 }
 297         }
 298
 299         delwin(dialog);
 300         return KEY_ESC;         /* ESC pressed */
 301 }