AVR: aversive_10-03-12/config/scripts/lxdialog/inputbox.c Source File

00001 /*
00002  *  inputbox.c -- implements the input box
00003  *
00004  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
00005  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
00006  *
00007  *  This program is free software; you can redistribute it and/or
00008  *  modify it under the terms of the GNU General Public License
00009  *  as published by the Free Software Foundation; either version 2
00010  *  of the License, or (at your option) any later version.
00011  *
00012  *  This program is distributed in the hope that it will be useful,
00013  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  *  GNU General Public License for more details.
00016  *
00017  *  You should have received a copy of the GNU General Public License
00018  *  along with this program; if not, write to the Free Software
00019  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00020  */
00021 
00022 #include "dialog.h"
00023 
00024 unsigned char dialog_input_result[MAX_LEN + 1];
00025 
00026 /*
00027  *  Print the termination buttons
00028  */
00029 static void
00030 print_buttons(WINDOW *dialog, int height, int width, int selected)
00031 {
00032     int x = width / 2 - 11;
00033     int y = height - 2;
00034 
00035     print_button (dialog, "  Ok  ", y, x, selected==0);
00036     print_button (dialog, " Help ", y, x + 14, selected==1);
00037 
00038     wmove(dialog, y, x+1+14*selected);
00039     wrefresh(dialog);
00040 }
00041 
00042 /*
00043  * Display a dialog box for inputing a string
00044  */
00045 int
00046 dialog_inputbox (const char *title, const char *prompt, int height, int width,
00047                  const char *init)
00048 {
00049     int i, x, y, box_y, box_x, box_width;
00050     int input_x = 0, scroll = 0, key = 0, button = -1;
00051     unsigned char *instr = dialog_input_result;
00052     WINDOW *dialog;
00053 
00054     /* center dialog box on screen */
00055     x = (COLS - width) / 2;
00056     y = (LINES - height) / 2;
00057 
00058 
00059     draw_shadow (stdscr, y, x, height, width);
00060 
00061     dialog = newwin (height, width, y, x);
00062     keypad (dialog, TRUE);
00063 
00064     draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
00065     wattrset (dialog, border_attr);
00066     mvwaddch (dialog, height-3, 0, ACS_LTEE);
00067     for (i = 0; i < width - 2; i++)
00068         waddch (dialog, ACS_HLINE);
00069     wattrset (dialog, dialog_attr);
00070     waddch (dialog, ACS_RTEE);
00071 
00072     if (title != NULL && strlen(title) >= width-2 ) {
00073         /* truncate long title -- mec */
00074         char * title2 = malloc(width-2+1);
00075         memcpy( title2, title, width-2 );
00076         title2[width-2] = '\0';
00077         title = title2;
00078     }
00079 
00080     if (title != NULL) {
00081         wattrset (dialog, title_attr);
00082         mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
00083         waddstr (dialog, (char *)title);
00084         waddch (dialog, ' ');
00085     }
00086 
00087     wattrset (dialog, dialog_attr);
00088     print_autowrap (dialog, prompt, width - 2, 1, 3);
00089 
00090     /* Draw the input field box */
00091     box_width = width - 6;
00092     getyx (dialog, y, x);
00093     box_y = y + 2;
00094     box_x = (width - box_width) / 2;
00095     draw_box (dialog, y + 1, box_x - 1, 3, box_width + 2,
00096               border_attr, dialog_attr);
00097 
00098     print_buttons(dialog, height, width, 0);
00099 
00100     /* Set up the initial value */
00101     wmove (dialog, box_y, box_x);
00102     wattrset (dialog, inputbox_attr);
00103 
00104     if (!init)
00105         instr[0] = '\0';
00106     else
00107         strcpy (instr, init);
00108 
00109     input_x = strlen (instr);
00110 
00111     if (input_x >= box_width) {
00112         scroll = input_x - box_width + 1;
00113         input_x = box_width - 1;
00114         for (i = 0; i < box_width - 1; i++)
00115             waddch (dialog, instr[scroll + i]);
00116     } else
00117         waddstr (dialog, instr);
00118 
00119     wmove (dialog, box_y, box_x + input_x);
00120 
00121     wrefresh (dialog);
00122 
00123     while (key != ESC) {
00124         key = wgetch (dialog);
00125 
00126         if (button == -1) {     /* Input box selected */
00127             switch (key) {
00128             case TAB:
00129             case KEY_UP:
00130             case KEY_DOWN:
00131                 break;
00132             case KEY_LEFT:
00133                 continue;
00134             case KEY_RIGHT:
00135                 continue;
00136             case KEY_BACKSPACE:
00137             case 127:
00138                 if (input_x || scroll) {
00139                     wattrset (dialog, inputbox_attr);
00140                     if (!input_x) {
00141                         scroll = scroll < box_width - 1 ?
00142                             0 : scroll - (box_width - 1);
00143                         wmove (dialog, box_y, box_x);
00144                         for (i = 0; i < box_width; i++)
00145                             waddch (dialog, instr[scroll + input_x + i] ?
00146                                     instr[scroll + input_x + i] : ' ');
00147                         input_x = strlen (instr) - scroll;
00148                     } else
00149                         input_x--;
00150                     instr[scroll + input_x] = '\0';
00151                     mvwaddch (dialog, box_y, input_x + box_x, ' ');
00152                     wmove (dialog, box_y, input_x + box_x);
00153                     wrefresh (dialog);
00154                 }
00155                 continue;
00156             default:
00157                 if (key < 0x100 && isprint (key)) {
00158                     if (scroll + input_x < MAX_LEN) {
00159                         wattrset (dialog, inputbox_attr);
00160                         instr[scroll + input_x] = key;
00161                         instr[scroll + input_x + 1] = '\0';
00162                         if (input_x == box_width - 1) {
00163                             scroll++;
00164                             wmove (dialog, box_y, box_x);
00165                             for (i = 0; i < box_width - 1; i++)
00166                                 waddch (dialog, instr[scroll + i]);
00167                         } else {
00168                             wmove (dialog, box_y, input_x++ + box_x);
00169                             waddch (dialog, key);
00170                         }
00171                         wrefresh (dialog);
00172                     } else
00173                         flash ();       /* Alarm user about overflow */
00174                     continue;
00175                 }
00176             }
00177         }
00178         switch (key) {
00179         case 'O':
00180         case 'o':
00181             delwin (dialog);
00182             return 0;
00183         case 'H':
00184         case 'h':
00185             delwin (dialog);
00186             return 1;
00187         case KEY_UP:
00188         case KEY_LEFT:
00189             switch (button) {
00190             case -1:
00191                 button = 1;     /* Indicates "Cancel" button is selected */
00192                 print_buttons(dialog, height, width, 1);
00193                 break;
00194             case 0:
00195                 button = -1;    /* Indicates input box is selected */
00196                 print_buttons(dialog, height, width, 0);
00197                 wmove (dialog, box_y, box_x + input_x);
00198                 wrefresh (dialog);
00199                 break;
00200             case 1:
00201                 button = 0;     /* Indicates "OK" button is selected */
00202                 print_buttons(dialog, height, width, 0);
00203                 break;
00204             }
00205             break;
00206         case TAB:
00207         case KEY_DOWN:
00208         case KEY_RIGHT:
00209             switch (button) {
00210             case -1:
00211                 button = 0;     /* Indicates "OK" button is selected */
00212                 print_buttons(dialog, height, width, 0);
00213                 break;
00214             case 0:
00215                 button = 1;     /* Indicates "Cancel" button is selected */
00216                 print_buttons(dialog, height, width, 1);
00217                 break;
00218             case 1:
00219                 button = -1;    /* Indicates input box is selected */
00220                 print_buttons(dialog, height, width, 0);
00221                 wmove (dialog, box_y, box_x + input_x);
00222                 wrefresh (dialog);
00223                 break;
00224             }
00225             break;
00226         case ' ':
00227         case '\n':
00228             delwin (dialog);
00229             return (button == -1 ? 0 : button);
00230         case 'X':
00231         case 'x':
00232             key = ESC;
00233         case ESC:
00234             break;
00235         }
00236     }
00237 
00238     delwin (dialog);
00239     return -1;                  /* ESC pressed */
00240 }