| 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);␊ |
| 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 | int dialog_textbox(const char *title, const char *tbuf,␊ |
| 52 | ␉␉ int initial_height, int initial_width)␊ |
| 53 | {␊ |
| 54 | ␉int i, x, y, cur_x, cur_y, key = 0;␊ |
| 55 | ␉int height, width, boxh, boxw;␊ |
| 56 | ␉int passed_end;␊ |
| 57 | ␉WINDOW *dialog, *box;␊ |
| 58 | ␊ |
| 59 | ␉begin_reached = 1;␊ |
| 60 | ␉end_reached = 0;␊ |
| 61 | ␉page_length = 0;␊ |
| 62 | ␉hscroll = 0;␊ |
| 63 | ␉buf = tbuf;␊ |
| 64 | ␉page = buf;␉/* page is pointer to start of page to be displayed */␊ |
| 65 | ␊ |
| 66 | do_resize:␊ |
| 67 | ␉getmaxyx(stdscr, height, width);␊ |
| 68 | ␉if (height < 8 || width < 8)␊ |
| 69 | ␉␉return -ERRDISPLAYTOOSMALL;␊ |
| 70 | ␉if (initial_height != 0)␊ |
| 71 | ␉␉height = initial_height;␊ |
| 72 | ␉else␊ |
| 73 | ␉␉if (height > 4)␊ |
| 74 | ␉␉␉height -= 4;␊ |
| 75 | ␉␉else␊ |
| 76 | ␉␉␉height = 0;␊ |
| 77 | ␉if (initial_width != 0)␊ |
| 78 | ␉␉width = initial_width;␊ |
| 79 | ␉else␊ |
| 80 | ␉␉if (width > 5)␊ |
| 81 | ␉␉␉width -= 5;␊ |
| 82 | ␉␉else␊ |
| 83 | ␉␉␉width = 0;␊ |
| 84 | ␊ |
| 85 | ␉/* center dialog box on screen */␊ |
| 86 | ␉x = (COLS - width) / 2;␊ |
| 87 | ␉y = (LINES - height) / 2;␊ |
| 88 | ␊ |
| 89 | ␉draw_shadow(stdscr, y, x, height, width);␊ |
| 90 | ␊ |
| 91 | ␉dialog = newwin(height, width, y, x);␊ |
| 92 | ␉keypad(dialog, TRUE);␊ |
| 93 | ␊ |
| 94 | ␉/* Create window for box region, used for scrolling text */␊ |
| 95 | ␉boxh = height - 4;␊ |
| 96 | ␉boxw = width - 2;␊ |
| 97 | ␉box = subwin(dialog, boxh, boxw, y + 1, x + 1);␊ |
| 98 | ␉wattrset(box, dlg.dialog.atr);␊ |
| 99 | ␉wbkgdset(box, dlg.dialog.atr & A_COLOR);␊ |
| 100 | ␊ |
| 101 | ␉keypad(box, TRUE);␊ |
| 102 | ␊ |
| 103 | ␉/* register the new window, along with its borders */␊ |
| 104 | ␉draw_box(dialog, 0, 0, height, width,␊ |
| 105 | ␉␉ dlg.dialog.atr, dlg.border.atr);␊ |
| 106 | ␊ |
| 107 | ␉wattrset(dialog, dlg.border.atr);␊ |
| 108 | ␉mvwaddch(dialog, height - 3, 0, ACS_LTEE);␊ |
| 109 | ␉for (i = 0; i < width - 2; i++)␊ |
| 110 | ␉␉waddch(dialog, ACS_HLINE);␊ |
| 111 | ␉wattrset(dialog, dlg.dialog.atr);␊ |
| 112 | ␉wbkgdset(dialog, dlg.dialog.atr & A_COLOR);␊ |
| 113 | ␉waddch(dialog, ACS_RTEE);␊ |
| 114 | ␊ |
| 115 | ␉print_title(dialog, title, width);␊ |
| 116 | ␊ |
| 117 | ␉print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE);␊ |
| 118 | ␉wnoutrefresh(dialog);␊ |
| 119 | ␉getyx(dialog, cur_y, cur_x);␉/* Save cursor position */␊ |
| 120 | ␊ |
| 121 | ␉/* Print first page of text */␊ |
| 122 | ␉attr_clear(box, boxh, boxw, dlg.dialog.atr);␊ |
| 123 | ␉refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);␊ |
| 124 | ␊ |
| 125 | ␉while ((key != KEY_ESC) && (key != '\n')) {␊ |
| 126 | ␉␉key = wgetch(dialog);␊ |
| 127 | ␉␉switch (key) {␊ |
| 128 | ␉␉case 'E':␉/* Exit */␊ |
| 129 | ␉␉case 'e':␊ |
| 130 | ␉␉case 'X':␊ |
| 131 | ␉␉case 'x':␊ |
| 132 | ␉␉␉delwin(box);␊ |
| 133 | ␉␉␉delwin(dialog);␊ |
| 134 | ␉␉␉return 0;␊ |
| 135 | ␉␉case 'g':␉/* First page */␊ |
| 136 | ␉␉case KEY_HOME:␊ |
| 137 | ␉␉␉if (!begin_reached) {␊ |
| 138 | ␉␉␉␉begin_reached = 1;␊ |
| 139 | ␉␉␉␉page = buf;␊ |
| 140 | ␉␉␉␉refresh_text_box(dialog, box, boxh, boxw,␊ |
| 141 | ␉␉␉␉␉␉ cur_y, cur_x);␊ |
| 142 | ␉␉␉}␊ |
| 143 | ␉␉␉break;␊ |
| 144 | ␉␉case 'G':␉/* Last page */␊ |
| 145 | ␉␉case KEY_END:␊ |
| 146 | ␊ |
| 147 | ␉␉␉end_reached = 1;␊ |
| 148 | ␉␉␉/* point to last char in buf */␊ |
| 149 | ␉␉␉page = buf + strlen(buf);␊ |
| 150 | ␉␉␉back_lines(boxh);␊ |
| 151 | ␉␉␉refresh_text_box(dialog, box, boxh, boxw,␊ |
| 152 | ␉␉␉␉␉ cur_y, cur_x);␊ |
| 153 | ␉␉␉break;␊ |
| 154 | ␉␉case 'K':␉/* Previous line */␊ |
| 155 | ␉␉case 'k':␊ |
| 156 | ␉␉case KEY_UP:␊ |
| 157 | ␉␉␉if (!begin_reached) {␊ |
| 158 | ␉␉␉␉back_lines(page_length + 1);␊ |
| 159 | ␊ |
| 160 | ␉␉␉␉/* We don't call print_page() here but use␊ |
| 161 | ␉␉␉␉ * scrolling to ensure faster screen update.␊ |
| 162 | ␉␉␉␉ * However, 'end_reached' and 'page_length'␊ |
| 163 | ␉␉␉␉ * should still be updated, and 'page' should␊ |
| 164 | ␉␉␉␉ * point to start of next page. This is done␊ |
| 165 | ␉␉␉␉ * by calling get_line() in the following␊ |
| 166 | ␉␉␉␉ * 'for' loop. */␊ |
| 167 | ␉␉␉␉scrollok(box, TRUE);␊ |
| 168 | ␉␉␉␉wscrl(box, -1);␉/* Scroll box region down one line */␊ |
| 169 | ␉␉␉␉scrollok(box, FALSE);␊ |
| 170 | ␉␉␉␉page_length = 0;␊ |
| 171 | ␉␉␉␉passed_end = 0;␊ |
| 172 | ␉␉␉␉for (i = 0; i < boxh; i++) {␊ |
| 173 | ␉␉␉␉␉if (!i) {␊ |
| 174 | ␉␉␉␉␉␉/* print first line of page */␊ |
| 175 | ␉␉␉␉␉␉print_line(box, 0, boxw);␊ |
| 176 | ␉␉␉␉␉␉wnoutrefresh(box);␊ |
| 177 | ␉␉␉␉␉} else␊ |
| 178 | ␉␉␉␉␉␉/* Called to update 'end_reached' and 'page' */␊ |
| 179 | ␉␉␉␉␉␉get_line();␊ |
| 180 | ␉␉␉␉␉if (!passed_end)␊ |
| 181 | ␉␉␉␉␉␉page_length++;␊ |
| 182 | ␉␉␉␉␉if (end_reached && !passed_end)␊ |
| 183 | ␉␉␉␉␉␉passed_end = 1;␊ |
| 184 | ␉␉␉␉}␊ |
| 185 | ␊ |
| 186 | ␉␉␉␉print_position(dialog);␊ |
| 187 | ␉␉␉␉wmove(dialog, cur_y, cur_x);␉/* Restore cursor position */␊ |
| 188 | ␉␉␉␉wrefresh(dialog);␊ |
| 189 | ␉␉␉}␊ |
| 190 | ␉␉␉break;␊ |
| 191 | ␉␉case 'B':␉/* Previous page */␊ |
| 192 | ␉␉case 'b':␊ |
| 193 | ␉␉case KEY_PPAGE:␊ |
| 194 | ␉␉␉if (begin_reached)␊ |
| 195 | ␉␉␉␉break;␊ |
| 196 | ␉␉␉back_lines(page_length + boxh);␊ |
| 197 | ␉␉␉refresh_text_box(dialog, box, boxh, boxw,␊ |
| 198 | ␉␉␉␉␉ cur_y, cur_x);␊ |
| 199 | ␉␉␉break;␊ |
| 200 | ␉␉case 'J':␉/* Next line */␊ |
| 201 | ␉␉case 'j':␊ |
| 202 | ␉␉case KEY_DOWN:␊ |
| 203 | ␉␉␉if (!end_reached) {␊ |
| 204 | ␉␉␉␉begin_reached = 0;␊ |
| 205 | ␉␉␉␉scrollok(box, TRUE);␊ |
| 206 | ␉␉␉␉scroll(box);␉/* Scroll box region up one line */␊ |
| 207 | ␉␉␉␉scrollok(box, FALSE);␊ |
| 208 | ␉␉␉␉print_line(box, boxh - 1, boxw);␊ |
| 209 | ␉␉␉␉wnoutrefresh(box);␊ |
| 210 | ␉␉␉␉print_position(dialog);␊ |
| 211 | ␉␉␉␉wmove(dialog, cur_y, cur_x);␉/* Restore cursor position */␊ |
| 212 | ␉␉␉␉wrefresh(dialog);␊ |
| 213 | ␉␉␉}␊ |
| 214 | ␉␉␉break;␊ |
| 215 | ␉␉case KEY_NPAGE:␉/* Next page */␊ |
| 216 | ␉␉case ' ':␊ |
| 217 | ␉␉␉if (end_reached)␊ |
| 218 | ␉␉␉␉break;␊ |
| 219 | ␊ |
| 220 | ␉␉␉begin_reached = 0;␊ |
| 221 | ␉␉␉refresh_text_box(dialog, box, boxh, boxw,␊ |
| 222 | ␉␉␉␉␉ cur_y, cur_x);␊ |
| 223 | ␉␉␉break;␊ |
| 224 | ␉␉case '0':␉/* Beginning of line */␊ |
| 225 | ␉␉case 'H':␉/* Scroll left */␊ |
| 226 | ␉␉case 'h':␊ |
| 227 | ␉␉case KEY_LEFT:␊ |
| 228 | ␉␉␉if (hscroll <= 0)␊ |
| 229 | ␉␉␉␉break;␊ |
| 230 | ␊ |
| 231 | ␉␉␉if (key == '0')␊ |
| 232 | ␉␉␉␉hscroll = 0;␊ |
| 233 | ␉␉␉else␊ |
| 234 | ␉␉␉␉hscroll--;␊ |
| 235 | ␉␉␉/* Reprint current page to scroll horizontally */␊ |
| 236 | ␉␉␉back_lines(page_length);␊ |
| 237 | ␉␉␉refresh_text_box(dialog, box, boxh, boxw,␊ |
| 238 | ␉␉␉␉␉ cur_y, cur_x);␊ |
| 239 | ␉␉␉break;␊ |
| 240 | ␉␉case 'L':␉/* Scroll right */␊ |
| 241 | ␉␉case 'l':␊ |
| 242 | ␉␉case KEY_RIGHT:␊ |
| 243 | ␉␉␉if (hscroll >= MAX_LEN)␊ |
| 244 | ␉␉␉␉break;␊ |
| 245 | ␉␉␉hscroll++;␊ |
| 246 | ␉␉␉/* Reprint current page to scroll horizontally */␊ |
| 247 | ␉␉␉back_lines(page_length);␊ |
| 248 | ␉␉␉refresh_text_box(dialog, box, boxh, boxw,␊ |
| 249 | ␉␉␉␉␉ cur_y, cur_x);␊ |
| 250 | ␉␉␉break;␊ |
| 251 | ␉␉case KEY_ESC:␊ |
| 252 | ␉␉␉key = on_key_esc(dialog);␊ |
| 253 | ␉␉␉break;␊ |
| 254 | ␉␉case KEY_RESIZE:␊ |
| 255 | ␉␉␉back_lines(height);␊ |
| 256 | ␉␉␉delwin(box);␊ |
| 257 | ␉␉␉delwin(dialog);␊ |
| 258 | ␉␉␉on_key_resize();␊ |
| 259 | ␉␉␉goto do_resize;␊ |
| 260 | ␉␉}␊ |
| 261 | ␉}␊ |
| 262 | ␉delwin(box);␊ |
| 263 | ␉delwin(dialog);␊ |
| 264 | ␉return key;␉␉/* ESC pressed */␊ |
| 265 | }␊ |
| 266 | ␊ |
| 267 | /*␊ |
| 268 | * Go back 'n' lines in text. Called by dialog_textbox().␊ |
| 269 | * 'page' will be updated to point to the desired line in 'buf'.␊ |
| 270 | */␊ |
| 271 | static void back_lines(int n)␊ |
| 272 | {␊ |
| 273 | ␉int i;␊ |
| 274 | ␊ |
| 275 | ␉begin_reached = 0;␊ |
| 276 | ␉/* Go back 'n' lines */␊ |
| 277 | ␉for (i = 0; i < n; i++) {␊ |
| 278 | ␉␉if (*page == '\0') {␊ |
| 279 | ␉␉␉if (end_reached) {␊ |
| 280 | ␉␉␉␉end_reached = 0;␊ |
| 281 | ␉␉␉␉continue;␊ |
| 282 | ␉␉␉}␊ |
| 283 | ␉␉}␊ |
| 284 | ␉␉if (page == buf) {␊ |
| 285 | ␉␉␉begin_reached = 1;␊ |
| 286 | ␉␉␉return;␊ |
| 287 | ␉␉}␊ |
| 288 | ␉␉page--;␊ |
| 289 | ␉␉do {␊ |
| 290 | ␉␉␉if (page == buf) {␊ |
| 291 | ␉␉␉␉begin_reached = 1;␊ |
| 292 | ␉␉␉␉return;␊ |
| 293 | ␉␉␉}␊ |
| 294 | ␉␉␉page--;␊ |
| 295 | ␉␉} while (*page != '\n');␊ |
| 296 | ␉␉page++;␊ |
| 297 | ␉}␊ |
| 298 | }␊ |
| 299 | ␊ |
| 300 | /*␊ |
| 301 | * Print a new page of text. Called by dialog_textbox().␊ |
| 302 | */␊ |
| 303 | static void print_page(WINDOW * win, int height, int width)␊ |
| 304 | {␊ |
| 305 | ␉int i, passed_end = 0;␊ |
| 306 | ␊ |
| 307 | ␉page_length = 0;␊ |
| 308 | ␉for (i = 0; i < height; i++) {␊ |
| 309 | ␉␉print_line(win, i, width);␊ |
| 310 | ␉␉if (!passed_end)␊ |
| 311 | ␉␉␉page_length++;␊ |
| 312 | ␉␉if (end_reached && !passed_end)␊ |
| 313 | ␉␉␉passed_end = 1;␊ |
| 314 | ␉}␊ |
| 315 | ␉wnoutrefresh(win);␊ |
| 316 | }␊ |
| 317 | ␊ |
| 318 | /*␊ |
| 319 | * Print a new line of text. Called by dialog_textbox() and print_page().␊ |
| 320 | */␊ |
| 321 | static void print_line(WINDOW * win, int row, int width)␊ |
| 322 | {␊ |
| 323 | ␉int y, x;␊ |
| 324 | ␉char *line;␊ |
| 325 | ␊ |
| 326 | ␉line = get_line();␊ |
| 327 | ␉line += MIN(strlen(line), hscroll);␉/* Scroll horizontally */␊ |
| 328 | ␉wmove(win, row, 0);␉/* move cursor to correct line */␊ |
| 329 | ␉waddch(win, ' ');␊ |
| 330 | ␉waddnstr(win, line, MIN(strlen(line), width - 2));␊ |
| 331 | ␊ |
| 332 | ␉getyx(win, y, x);␊ |
| 333 | ␉/* Clear 'residue' of previous line */␊ |
| 334 | #if OLD_NCURSES␊ |
| 335 | ␉{␊ |
| 336 | ␉␉int i;␊ |
| 337 | ␉␉for (i = 0; i < width - x; i++)␊ |
| 338 | ␉␉␉waddch(win, ' ');␊ |
| 339 | ␉}␊ |
| 340 | #else␊ |
| 341 | ␉wclrtoeol(win);␊ |
| 342 | #endif␊ |
| 343 | }␊ |
| 344 | ␊ |
| 345 | /*␊ |
| 346 | * Return current line of text. Called by dialog_textbox() and print_line().␊ |
| 347 | * 'page' should point to start of current line before calling, and will be␊ |
| 348 | * updated to point to start of next line.␊ |
| 349 | */␊ |
| 350 | static char *get_line(void)␊ |
| 351 | {␊ |
| 352 | ␉int i = 0;␊ |
| 353 | ␉static char line[MAX_LEN + 1];␊ |
| 354 | ␊ |
| 355 | ␉end_reached = 0;␊ |
| 356 | ␉while (*page != '\n') {␊ |
| 357 | ␉␉if (*page == '\0') {␊ |
| 358 | ␉␉␉if (!end_reached) {␊ |
| 359 | ␉␉␉␉end_reached = 1;␊ |
| 360 | ␉␉␉␉break;␊ |
| 361 | ␉␉␉}␊ |
| 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 pass '\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 | |
