1 /* 2 * textbox.c -- implements the text box 3 * 4 * ORIGINAL AUTHOR: Savio Lam ([email protected]) 5 * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected]) 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 static void back_lines(int n); 25 static void print_page(WINDOW * win, int height, int width); 26 static void print_line(WINDOW * win, int row, int width); 27 static char *get_line(void); 28 static void print_position(WINDOW * win); 29 30 static int hscroll; 31 static int begin_reached, end_reached, page_length; 32 static const char *buf; 33 static const char *page; 34 35 /* 36 * refresh window content 37 */ 38 static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw, 39 int cur_y, int cur_x) 40 { 41 print_page(box, boxh, boxw); 42 print_position(dialog); 43 wmove(dialog, cur_y, cur_x); /* Restore cursor position */ 44 wrefresh(dialog); 45 } 46 47 48 /* 49 * Display text from a file in a dialog box. 50 * 51 * keys is a null-terminated array 52 */ 53 int dialog_textbox(const char *title, const char *tbuf, int initial_height, 54 int initial_width, int *keys, int *_vscroll, int *_hscroll) 55 { 56 int i, x, y, cur_x, cur_y, key = 0; 57 int height, width, boxh, boxw; 58 WINDOW *dialog, *box; 59 bool done = false; 60 61 begin_reached = 1; 62 end_reached = 0; 63 page_length = 0; 64 hscroll = 0; 65 buf = tbuf; 66 page = buf; /* page is pointer to start of page to be displayed */ 67 68 if (_vscroll && *_vscroll) { 69 begin_reached = 0; 70 71 for (i = 0; i < *_vscroll; i++) 72 get_line(); 73 } 74 if (_hscroll) 75 hscroll = *_hscroll; 76 77 do_resize: 78 getmaxyx(stdscr, height, width); 79 if (height < 8 || width < 8) 80 return -ERRDISPLAYTOOSMALL; 81 if (initial_height != 0) 82 height = initial_height; 83 else 84 if (height > 4) 85 height -= 4; 86 else 87 height = 0; 88 if (initial_width != 0) 89 width = initial_width; 90 else 91 if (width > 5) 92 width -= 5; 93 else 94 width = 0; 95 96 /* center dialog box on screen */ 97 x = (COLS - width) / 2; 98 y = (LINES - height) / 2; 99 100 draw_shadow(stdscr, y, x, height, width); 101 102 dialog = newwin(height, width, y, x); 103 keypad(dialog, TRUE); 104 105 /* Create window for box region, used for scrolling text */ 106 boxh = height - 4; 107 boxw = width - 2; 108 box = subwin(dialog, boxh, boxw, y + 1, x + 1); 109 wattrset(box, dlg.dialog.atr); 110 wbkgdset(box, dlg.dialog.atr & A_COLOR); 111 112 keypad(box, TRUE); 113 114 /* register the new window, along with its borders */ 115 draw_box(dialog, 0, 0, height, width, 116 dlg.dialog.atr, dlg.border.atr); 117 118 wattrset(dialog, dlg.border.atr); 119 mvwaddch(dialog, height - 3, 0, ACS_LTEE); 120 for (i = 0; i < width - 2; i++) 121 waddch(dialog, ACS_HLINE); 122 wattrset(dialog, dlg.dialog.atr); 123 wbkgdset(dialog, dlg.dialog.atr & A_COLOR); 124 waddch(dialog, ACS_RTEE); 125 126 print_title(dialog, title, width); 127 128 print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE); 129 wnoutrefresh(dialog); 130 getyx(dialog, cur_y, cur_x); /* Save cursor position */ 131 132 /* Print first page of text */ 133 attr_clear(box, boxh, boxw, dlg.dialog.atr); 134 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x); 135 136 while (!done) { 137 key = wgetch(dialog); 138 switch (key) { 139 case 'E': /* Exit */ 140 case 'e': 141 case 'X': 142 case 'x': 143 case 'q': 144 case '\n': 145 done = true; 146 break; 147 case 'g': /* First page */ 148 case KEY_HOME: 149 if (!begin_reached) { 150 begin_reached = 1; 151 page = buf; 152 refresh_text_box(dialog, box, boxh, boxw, 153 cur_y, cur_x); 154 } 155 break; 156 case 'G': /* Last page */ 157 case KEY_END: 158 159 end_reached = 1; 160 /* point to last char in buf */ 161 page = buf + strlen(buf); 162 back_lines(boxh); 163 refresh_text_box(dialog, box, boxh, boxw, 164 cur_y, cur_x); 165 break; 166 case 'K': /* Previous line */ 167 case 'k': 168 case KEY_UP: 169 if (!begin_reached) { 170 int passed_end = 0; 171 172 back_lines(page_length + 1); 173 174 /* We don't call print_page() here but use 175 * scrolling to ensure faster screen update. 176 * However, 'end_reached' and 'page_length' 177 * should still be updated, and 'page' should 178 * point to start of next page. This is done 179 * by calling get_line() in the following 180 * 'for' loop. */ 181 scrollok(box, TRUE); 182 wscrl(box, -1); /* Scroll box region down one line */ 183 scrollok(box, FALSE); 184 page_length = 0; 185 for (i = 0; i < boxh; i++) { 186 if (!i) { 187 /* print first line of page */ 188 print_line(box, 0, boxw); 189 wnoutrefresh(box); 190 } else 191 /* Called to update 'end_reached' and 'page' */ 192 get_line(); 193 if (!passed_end) 194 page_length++; 195 if (end_reached && !passed_end) 196 passed_end = 1; 197 } 198 199 print_position(dialog); 200 wmove(dialog, cur_y, cur_x); /* Restore cursor position */ 201 wrefresh(dialog); 202 } 203 break; 204 case 'B': /* Previous page */ 205 case 'b': 206 case 'u': 207 case KEY_PPAGE: 208 if (begin_reached) 209 break; 210 back_lines(page_length + boxh); 211 refresh_text_box(dialog, box, boxh, boxw, 212 cur_y, cur_x); 213 break; 214 case 'J': /* Next line */ 215 case 'j': 216 case KEY_DOWN: 217 if (!end_reached) { 218 begin_reached = 0; 219 scrollok(box, TRUE); 220 scroll(box); /* Scroll box region up one line */ 221 scrollok(box, FALSE); 222 print_line(box, boxh - 1, boxw); 223 wnoutrefresh(box); 224 print_position(dialog); 225 wmove(dialog, cur_y, cur_x); /* Restore cursor position */ 226 wrefresh(dialog); 227 } 228 break; 229 case KEY_NPAGE: /* Next page */ 230 case ' ': 231 case 'd': 232 if (end_reached) 233 break; 234 235 begin_reached = 0; 236 refresh_text_box(dialog, box, boxh, boxw, 237 cur_y, cur_x); 238 break; 239 case '0': /* Beginning of line */ 240 case 'H': /* Scroll left */ 241 case 'h': 242 case KEY_LEFT: 243 if (hscroll <= 0) 244 break; 245 246 if (key == '0') 247 hscroll = 0; 248 else 249 hscroll--; 250 /* Reprint current page to scroll horizontally */ 251 back_lines(page_length); 252 refresh_text_box(dialog, box, boxh, boxw, 253 cur_y, cur_x); 254 break; 255 case 'L': /* Scroll right */ 256 case 'l': 257 case KEY_RIGHT: 258 if (hscroll >= MAX_LEN) 259 break; 260 hscroll++; 261 /* Reprint current page to scroll horizontally */ 262 back_lines(page_length); 263 refresh_text_box(dialog, box, boxh, boxw, 264 cur_y, cur_x); 265 break; 266 case KEY_ESC: 267 if (on_key_esc(dialog) == KEY_ESC) 268 done = true; 269 break; 270 case KEY_RESIZE: 271 back_lines(height); 272 delwin(box); 273 delwin(dialog); 274 on_key_resize(); 275 goto do_resize; 276 default: 277 for (i = 0; keys[i]; i++) { 278 if (key == keys[i]) { 279 done = true; 280 break; 281 } 282 } 283 } 284 } 285 delwin(box); 286 delwin(dialog); 287 if (_vscroll) { 288 const char *s; 289 290 s = buf; 291 *_vscroll = 0; 292 back_lines(page_length); 293 while (s < page && (s = strchr(s, '\n'))) { 294 (*_vscroll)++; 295 s++; 296 } 297 } 298 if (_hscroll) 299 *_hscroll = hscroll; 300 return key; 301 } 302 303 /* 304 * Go back 'n' lines in text. Called by dialog_textbox(). 305 * 'page' will be updated to point to the desired line in 'buf'. 306 */ 307 static void back_lines(int n) 308 { 309 int i; 310 311 begin_reached = 0; 312 /* Go back 'n' lines */ 313 for (i = 0; i < n; i++) { 314 if (*page == '\0') { 315 if (end_reached) { 316 end_reached = 0; 317 continue; 318 } 319 } 320 if (page == buf) { 321 begin_reached = 1; 322 return; 323 } 324 page--; 325 do { 326 if (page == buf) { 327 begin_reached = 1; 328 return; 329 } 330 page--; 331 } while (*page != '\n'); 332 page++; 333 } 334 } 335 336 /* 337 * Print a new page of text. Called by dialog_textbox(). 338 */ 339 static void print_page(WINDOW * win, int height, int width) 340 { 341 int i, passed_end = 0; 342 343 page_length = 0; 344 for (i = 0; i < height; i++) { 345 print_line(win, i, width); 346 if (!passed_end) 347 page_length++; 348 if (end_reached && !passed_end) 349 passed_end = 1; 350 } 351 wnoutrefresh(win); 352 } 353 354 /* 355 * Print a new line of text. Called by dialog_textbox() and print_page(). 356 */ 357 static void print_line(WINDOW * win, int row, int width) 358 { 359 char *line; 360 361 line = get_line(); 362 line += MIN(strlen(line), hscroll); /* Scroll horizontally */ 363 wmove(win, row, 0); /* move cursor to correct line */ 364 waddch(win, ' '); 365 waddnstr(win, line, MIN(strlen(line), width - 2)); 366 367 /* Clear 'residue' of previous line */ 368 #if OLD_NCURSES 369 { 370 int x = getcurx(win); 371 int i; 372 for (i = 0; i < width - x; i++) 373 waddch(win, ' '); 374 } 375 #else 376 wclrtoeol(win); 377 #endif 378 } 379 380 /* 381 * Return current line of text. Called by dialog_textbox() and print_line(). 382 * 'page' should point to start of current line before calling, and will be 383 * updated to point to start of next line. 384 */ 385 static char *get_line(void) 386 { 387 int i = 0; 388 static char line[MAX_LEN + 1]; 389 390 end_reached = 0; 391 while (*page != '\n') { 392 if (*page == '\0') { 393 end_reached = 1; 394 break; 395 } else if (i < MAX_LEN) 396 line[i++] = *(page++); 397 else { 398 /* Truncate lines longer than MAX_LEN characters */ 399 if (i == MAX_LEN) 400 line[i++] = '\0'; 401 page++; 402 } 403 } 404 if (i <= MAX_LEN) 405 line[i] = '\0'; 406 if (!end_reached) 407 page++; /* move past '\n' */ 408 409 return line; 410 } 411 412 /* 413 * Print current position 414 */ 415 static void print_position(WINDOW * win) 416 { 417 int percent; 418 419 wattrset(win, dlg.position_indicator.atr); 420 wbkgdset(win, dlg.position_indicator.atr & A_COLOR); 421 percent = (page - buf) * 100 / strlen(buf); 422 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9); 423 wprintw(win, "(%3d%%)", percent); 424 } 425