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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 | /* * textbox.c -- implements the text box * * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk) * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "dialog.h" static void back_lines(int n); static void print_page(WINDOW *win, int height, int width, update_text_fn update_text, void *data); static void print_line(WINDOW *win, int row, int width); static char *get_line(void); static void print_position(WINDOW * win); static int hscroll; static int begin_reached, end_reached, page_length; static char *buf; static char *page; /* * refresh window content */ static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw, int cur_y, int cur_x, update_text_fn update_text, void *data) { print_page(box, boxh, boxw, update_text, data); print_position(dialog); wmove(dialog, cur_y, cur_x); /* Restore cursor position */ wrefresh(dialog); } /* * Display text from a file in a dialog box. * * keys is a null-terminated array * update_text() may not add or remove any '\n' or '\0' in tbuf */ int dialog_textbox(const char *title, char *tbuf, int initial_height, int initial_width, int *keys, int *_vscroll, int *_hscroll, update_text_fn update_text, void *data) { int i, x, y, cur_x, cur_y, key = 0; int height, width, boxh, boxw; WINDOW *dialog, *box; bool done = false; begin_reached = 1; end_reached = 0; page_length = 0; hscroll = 0; buf = tbuf; page = buf; /* page is pointer to start of page to be displayed */ if (_vscroll && *_vscroll) { begin_reached = 0; for (i = 0; i < *_vscroll; i++) get_line(); } if (_hscroll) hscroll = *_hscroll; do_resize: getmaxyx(stdscr, height, width); if (height < TEXTBOX_HEIGTH_MIN || width < TEXTBOX_WIDTH_MIN) return -ERRDISPLAYTOOSMALL; if (initial_height != 0) height = initial_height; else if (height > 4) height -= 4; else height = 0; if (initial_width != 0) width = initial_width; else if (width > 5) width -= 5; else width = 0; /* center dialog box on screen */ x = (getmaxx(stdscr) - width) / 2; y = (getmaxy(stdscr) - height) / 2; draw_shadow(stdscr, y, x, height, width); dialog = newwin(height, width, y, x); keypad(dialog, TRUE); /* Create window for box region, used for scrolling text */ boxh = height - 4; boxw = width - 2; box = subwin(dialog, boxh, boxw, y + 1, x + 1); wattrset(box, dlg.dialog.atr); wbkgdset(box, dlg.dialog.atr & A_COLOR); keypad(box, TRUE); /* register the new window, along with its borders */ draw_box(dialog, 0, 0, height, width, dlg.dialog.atr, dlg.border.atr); wattrset(dialog, dlg.border.atr); mvwaddch(dialog, height - 3, 0, ACS_LTEE); for (i = 0; i < width - 2; i++) waddch(dialog, ACS_HLINE); wattrset(dialog, dlg.dialog.atr); wbkgdset(dialog, dlg.dialog.atr & A_COLOR); waddch(dialog, ACS_RTEE); print_title(dialog, title, width); print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE); wnoutrefresh(dialog); getyx(dialog, cur_y, cur_x); /* Save cursor position */ /* Print first page of text */ attr_clear(box, boxh, boxw, dlg.dialog.atr); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); while (!done) { key = wgetch(dialog); switch (key) { case 'E': /* Exit */ case 'e': case 'X': case 'x': case 'q': case '\n': done = true; break; case 'g': /* First page */ case KEY_HOME: if (!begin_reached) { begin_reached = 1; page = buf; refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); } break; case 'G': /* Last page */ case KEY_END: end_reached = 1; /* point to last char in buf */ page = buf + strlen(buf); back_lines(boxh); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case 'K': /* Previous line */ case 'k': case KEY_UP: if (begin_reached) break; back_lines(page_length + 1); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case 'B': /* Previous page */ case 'b': case 'u': case KEY_PPAGE: if (begin_reached) break; back_lines(page_length + boxh); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case 'J': /* Next line */ case 'j': case KEY_DOWN: if (end_reached) break; back_lines(page_length - 1); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case KEY_NPAGE: /* Next page */ case ' ': case 'd': if (end_reached) break; begin_reached = 0; refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case '0': /* Beginning of line */ case 'H': /* Scroll left */ case 'h': case KEY_LEFT: if (hscroll <= 0) break; if (key == '0') hscroll = 0; else hscroll--; /* Reprint current page to scroll horizontally */ back_lines(page_length); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case 'L': /* Scroll right */ case 'l': case KEY_RIGHT: if (hscroll >= MAX_LEN) break; hscroll++; /* Reprint current page to scroll horizontally */ back_lines(page_length); refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text, data); break; case KEY_ESC: if (on_key_esc(dialog) == KEY_ESC) done = true; break; case KEY_RESIZE: back_lines(height); delwin(box); delwin(dialog); on_key_resize(); goto do_resize; default: for (i = 0; keys[i]; i++) { if (key == keys[i]) { done = true; break; } } } } delwin(box); delwin(dialog); if (_vscroll) { const char *s; s = buf; *_vscroll = 0; back_lines(page_length); while (s < page && (s = strchr(s, '\n'))) { (*_vscroll)++; s++; } } if (_hscroll) *_hscroll = hscroll; return key; } /* * Go back 'n' lines in text. Called by dialog_textbox(). * 'page' will be updated to point to the desired line in 'buf'. */ static void back_lines(int n) { int i; begin_reached = 0; /* Go back 'n' lines */ for (i = 0; i < n; i++) { if (*page == '\0') { if (end_reached) { end_reached = 0; continue; } } if (page == buf) { begin_reached = 1; return; } page--; do { if (page == buf) { begin_reached = 1; return; } page--; } while (*page != '\n'); page++; } } /* * Print a new page of text. */ static void print_page(WINDOW *win, int height, int width, update_text_fn update_text, void *data) { int i, passed_end = 0; if (update_text) { char *end; for (i = 0; i < height; i++) get_line(); end = page; back_lines(height); update_text(buf, page - buf, end - buf, data); } page_length = 0; for (i = 0; i < height; i++) { print_line(win, i, width); if (!passed_end) page_length++; if (end_reached && !passed_end) passed_end = 1; } wnoutrefresh(win); } /* * Print a new line of text. */ static void print_line(WINDOW * win, int row, int width) { char *line; line = get_line(); line += MIN(strlen(line), hscroll); /* Scroll horizontally */ wmove(win, row, 0); /* move cursor to correct line */ waddch(win, ' '); waddnstr(win, line, MIN(strlen(line), width - 2)); /* Clear 'residue' of previous line */ #if OLD_NCURSES { int x = getcurx(win); int i; for (i = 0; i < width - x; i++) waddch(win, ' '); } #else wclrtoeol(win); #endif } /* * Return current line of text. Called by dialog_textbox() and print_line(). * 'page' should point to start of current line before calling, and will be * updated to point to start of next line. */ static char *get_line(void) { int i = 0; static char line[MAX_LEN + 1]; end_reached = 0; while (*page != '\n') { if (*page == '\0') { end_reached = 1; break; } else if (i < MAX_LEN) line[i++] = *(page++); else { /* Truncate lines longer than MAX_LEN characters */ if (i == MAX_LEN) line[i++] = '\0'; page++; } } if (i <= MAX_LEN) line[i] = '\0'; if (!end_reached) page++; /* move past '\n' */ return line; } /* * Print current position */ static void print_position(WINDOW * win) { int percent; wattrset(win, dlg.position_indicator.atr); wbkgdset(win, dlg.position_indicator.atr & A_COLOR); percent = (page - buf) * 100 / strlen(buf); wmove(win, getmaxy(win) - 3, getmaxx(win) - 9); wprintw(win, "(%3d%%)", percent); } |