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