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 break; 171 172 back_lines(page_length + 1); 173 refresh_text_box(dialog, box, boxh, boxw, cur_y, 174 cur_x); 175 break; 176 case 'B': /* Previous page */ 177 case 'b': 178 case 'u': 179 case KEY_PPAGE: 180 if (begin_reached) 181 break; 182 back_lines(page_length + boxh); 183 refresh_text_box(dialog, box, boxh, boxw, 184 cur_y, cur_x); 185 break; 186 case 'J': /* Next line */ 187 case 'j': 188 case KEY_DOWN: 189 if (end_reached) 190 break; 191 192 back_lines(page_length - 1); 193 refresh_text_box(dialog, box, boxh, boxw, cur_y, 194 cur_x); 195 break; 196 case KEY_NPAGE: /* Next page */ 197 case ' ': 198 case 'd': 199 if (end_reached) 200 break; 201 202 begin_reached = 0; 203 refresh_text_box(dialog, box, boxh, boxw, 204 cur_y, cur_x); 205 break; 206 case '0': /* Beginning of line */ 207 case 'H': /* Scroll left */ 208 case 'h': 209 case KEY_LEFT: 210 if (hscroll <= 0) 211 break; 212 213 if (key == '0') 214 hscroll = 0; 215 else 216 hscroll--; 217 /* Reprint current page to scroll horizontally */ 218 back_lines(page_length); 219 refresh_text_box(dialog, box, boxh, boxw, 220 cur_y, cur_x); 221 break; 222 case 'L': /* Scroll right */ 223 case 'l': 224 case KEY_RIGHT: 225 if (hscroll >= MAX_LEN) 226 break; 227 hscroll++; 228 /* Reprint current page to scroll horizontally */ 229 back_lines(page_length); 230 refresh_text_box(dialog, box, boxh, boxw, 231 cur_y, cur_x); 232 break; 233 case KEY_ESC: 234 if (on_key_esc(dialog) == KEY_ESC) 235 done = true; 236 break; 237 case KEY_RESIZE: 238 back_lines(height); 239 delwin(box); 240 delwin(dialog); 241 on_key_resize(); 242 goto do_resize; 243 default: 244 for (i = 0; keys[i]; i++) { 245 if (key == keys[i]) { 246 done = true; 247 break; 248 } 249 } 250 } 251 } 252 delwin(box); 253 delwin(dialog); 254 if (_vscroll) { 255 const char *s; 256 257 s = buf; 258 *_vscroll = 0; 259 back_lines(page_length); 260 while (s < page && (s = strchr(s, '\n'))) { 261 (*_vscroll)++; 262 s++; 263 } 264 } 265 if (_hscroll) 266 *_hscroll = hscroll; 267 return key; 268 } 269 270 /* 271 * Go back 'n' lines in text. Called by dialog_textbox(). 272 * 'page' will be updated to point to the desired line in 'buf'. 273 */ 274 static void back_lines(int n) 275 { 276 int i; 277 278 begin_reached = 0; 279 /* Go back 'n' lines */ 280 for (i = 0; i < n; i++) { 281 if (*page == '\0') { 282 if (end_reached) { 283 end_reached = 0; 284 continue; 285 } 286 } 287 if (page == buf) { 288 begin_reached = 1; 289 return; 290 } 291 page--; 292 do { 293 if (page == buf) { 294 begin_reached = 1; 295 return; 296 } 297 page--; 298 } while (*page != '\n'); 299 page++; 300 } 301 } 302 303 /* 304 * Print a new page of text. Called by dialog_textbox(). 305 */ 306 static void print_page(WINDOW * win, int height, int width) 307 { 308 int i, passed_end = 0; 309 310 page_length = 0; 311 for (i = 0; i < height; i++) { 312 print_line(win, i, width); 313 if (!passed_end) 314 page_length++; 315 if (end_reached && !passed_end) 316 passed_end = 1; 317 } 318 wnoutrefresh(win); 319 } 320 321 /* 322 * Print a new line of text. Called by dialog_textbox() and print_page(). 323 */ 324 static void print_line(WINDOW * win, int row, int width) 325 { 326 char *line; 327 328 line = get_line(); 329 line += MIN(strlen(line), hscroll); /* Scroll horizontally */ 330 wmove(win, row, 0); /* move cursor to correct line */ 331 waddch(win, ' '); 332 waddnstr(win, line, MIN(strlen(line), width - 2)); 333 334 /* Clear 'residue' of previous line */ 335 #if OLD_NCURSES 336 { 337 int x = getcurx(win); 338 int i; 339 for (i = 0; i < width - x; i++) 340 waddch(win, ' '); 341 } 342 #else 343 wclrtoeol(win); 344 #endif 345 } 346 347 /* 348 * Return current line of text. Called by dialog_textbox() and print_line(). 349 * 'page' should point to start of current line before calling, and will be 350 * updated to point to start of next line. 351 */ 352 static char *get_line(void) 353 { 354 int i = 0; 355 static char line[MAX_LEN + 1]; 356 357 end_reached = 0; 358 while (*page != '\n') { 359 if (*page == '\0') { 360 end_reached = 1; 361 break; 362 } else if (i < MAX_LEN) 363 line[i++] = *(page++); 364 else { 365 /* Truncate lines longer than MAX_LEN characters */ 366 if (i == MAX_LEN) 367 line[i++] = '\0'; 368 page++; 369 } 370 } 371 if (i <= MAX_LEN) 372 line[i] = '\0'; 373 if (!end_reached) 374 page++; /* move past '\n' */ 375 376 return line; 377 } 378 379 /* 380 * Print current position 381 */ 382 static void print_position(WINDOW * win) 383 { 384 int percent; 385 386 wattrset(win, dlg.position_indicator.atr); 387 wbkgdset(win, dlg.position_indicator.atr & A_COLOR); 388 percent = (page - buf) * 100 / strlen(buf); 389 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9); 390 wprintw(win, "(%3d%%)", percent); 391 } 392