scripts/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, "  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         if (!init)
  53                 instr[0] = '\0';
  54         else
  55                 strcpy(instr, init);
  56
  57 do_resize:
  58         if (getmaxy(stdscr) <= (height - 2))
  59                 return -ERRDISPLAYTOOSMALL;
  60         if (getmaxx(stdscr) <= (width - 2))
  61                 return -ERRDISPLAYTOOSMALL;
  62
  63         /* center dialog box on screen */
  64         x = (COLS - width) / 2;
  65         y = (LINES - height) / 2;
  66
  67         draw_shadow(stdscr, y, x, height, width);
  68
  69         dialog = newwin(height, width, y, x);
  70         keypad(dialog, TRUE);
  71
  72         draw_box(dialog, 0, 0, height, width,
  73                  dlg.dialog.atr, dlg.border.atr);
  74         wattrset(dialog, dlg.border.atr);
  75         mvwaddch(dialog, height - 3, 0, ACS_LTEE);
  76         for (i = 0; i < width - 2; i++)
  77                 waddch(dialog, ACS_HLINE);
  78         wattrset(dialog, dlg.dialog.atr);
  79         waddch(dialog, ACS_RTEE);
  80
  81         print_title(dialog, title, width);
  82
  83         wattrset(dialog, dlg.dialog.atr);
  84         print_autowrap(dialog, prompt, width - 2, 1, 3);
  85
  86         /* Draw the input field box */
  87         box_width = width - 6;
  88         getyx(dialog, y, x);
  89         box_y = y + 2;
  90         box_x = (width - box_width) / 2;
  91         draw_box(dialog, y + 1, box_x - 1, 3, box_width + 2,
  92                  dlg.border.atr, dlg.dialog.atr);
  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, dlg.inputbox.atr);
  99
 100         input_x = strlen(instr);
 101
 102         if (input_x >= box_width) {
 103                 scroll = input_x - box_width + 1;
 104                 input_x = box_width - 1;
 105                 for (i = 0; i < box_width - 1; i++)
 106                         waddch(dialog, instr[scroll + i]);
 107         } else {
 108                 waddstr(dialog, instr);
 109         }
 110
 111         wmove(dialog, box_y, box_x + input_x);
 112
 113         wrefresh(dialog);
 114
 115         while (key != KEY_ESC) {
 116                 key = wgetch(dialog);
 117
 118                 if (button == -1) {     /* Input box selected */
 119                         switch (key) {
 120                         case TAB:
 121                         case KEY_UP:
 122                         case KEY_DOWN:
 123                                 break;
 124                         case KEY_LEFT:
 125                                 continue;
 126                         case KEY_RIGHT:
 127                                 continue;
 128                         case KEY_BACKSPACE:
 129                         case 127:
 130                                 if (input_x || scroll) {
 131                                         wattrset(dialog, dlg.inputbox.atr);
 132                                         if (!input_x) {
 133                                                 scroll = scroll < box_width - 1 ? 0 : scroll - (box_width - 1);
 134                                                 wmove(dialog, box_y, box_x);
 135                                                 for (i = 0; i < box_width; i++)
 136                                                         waddch(dialog,
 137                                                                instr[scroll + input_x + i] ?
 138                                                                instr[scroll + input_x + i] : ' ');
 139                                                 input_x = strlen(instr) - scroll;
 140                                         } else
 141                                                 input_x--;
 142                                         instr[scroll + input_x] = '\0';
 143                                         mvwaddch(dialog, box_y, input_x + box_x, ' ');
 144                                         wmove(dialog, box_y, input_x + box_x);
 145                                         wrefresh(dialog);
 146                                 }
 147                                 continue;
 148                         default:
 149                                 if (key < 0x100 && isprint(key)) {
 150                                         if (scroll + input_x < MAX_LEN) {
 151                                                 wattrset(dialog, dlg.inputbox.atr);
 152                                                 instr[scroll + input_x] = key;
 153                                                 instr[scroll + input_x + 1] = '\0';
 154                                                 if (input_x == box_width - 1) {
 155                                                         scroll++;
 156                                                         wmove(dialog, box_y, box_x);
 157                                                         for (i = 0; i < box_width - 1; i++)
 158                                                                 waddch(dialog, instr [scroll + i]);
 159                                                 } else {
 160                                                         wmove(dialog, box_y, input_x++ + box_x);
 161                                                         waddch(dialog, key);
 162                                                 }
 163                                                 wrefresh(dialog);
 164                                         } else
 165                                                 flash();        /* Alarm user about overflow */
 166                                         continue;
 167                                 }
 168                         }
 169                 }
 170                 switch (key) {
 171                 case 'O':
 172                 case 'o':
 173                         delwin(dialog);
 174                         return 0;
 175                 case 'H':
 176                 case 'h':
 177                         delwin(dialog);
 178                         return 1;
 179                 case KEY_UP:
 180                 case KEY_LEFT:
 181                         switch (button) {
 182                         case -1:
 183                                 button = 1;     /* Indicates "Cancel" button is selected */
 184                                 print_buttons(dialog, height, width, 1);
 185                                 break;
 186                         case 0:
 187                                 button = -1;    /* Indicates input box is selected */
 188                                 print_buttons(dialog, height, width, 0);
 189                                 wmove(dialog, box_y, box_x + input_x);
 190                                 wrefresh(dialog);
 191                                 break;
 192                         case 1:
 193                                 button = 0;     /* Indicates "OK" button is selected */
 194                                 print_buttons(dialog, height, width, 0);
 195                                 break;
 196                         }
 197                         break;
 198                 case TAB:
 199                 case KEY_DOWN:
 200                 case KEY_RIGHT:
 201                         switch (button) {
 202                         case -1:
 203                                 button = 0;     /* Indicates "OK" button is selected */
 204                                 print_buttons(dialog, height, width, 0);
 205                                 break;
 206                         case 0:
 207                                 button = 1;     /* Indicates "Cancel" button is selected */
 208                                 print_buttons(dialog, height, width, 1);
 209                                 break;
 210                         case 1:
 211                                 button = -1;    /* Indicates input box is selected */
 212                                 print_buttons(dialog, height, width, 0);
 213                                 wmove(dialog, box_y, box_x + input_x);
 214                                 wrefresh(dialog);
 215                                 break;
 216                         }
 217                         break;
 218                 case ' ':
 219                 case '\n':
 220                         delwin(dialog);
 221                         return (button == -1 ? 0 : button);
 222                 case 'X':
 223                 case 'x':
 224                         key = KEY_ESC;
 225                         break;
 226                 case KEY_ESC:
 227                         key = on_key_esc(dialog);
 228                         break;
 229                 case KEY_RESIZE:
 230                         delwin(dialog);
 231                         on_key_resize();
 232                         goto do_resize;
 233                 }
 234         }
 235
 236         delwin(dialog);
 237         return KEY_ESC;         /* ESC pressed */
 238 }