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