1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/kconfig/lxdialog/textbox.c Sat Feb 24 11:00:05 2007 +0000
1.3 @@ -0,0 +1,391 @@
1.4 +/*
1.5 + * textbox.c -- implements the text box
1.6 + *
1.7 + * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
1.8 + * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
1.9 + *
1.10 + * This program is free software; you can redistribute it and/or
1.11 + * modify it under the terms of the GNU General Public License
1.12 + * as published by the Free Software Foundation; either version 2
1.13 + * of the License, or (at your option) any later version.
1.14 + *
1.15 + * This program is distributed in the hope that it will be useful,
1.16 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.17 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.18 + * GNU General Public License for more details.
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License
1.21 + * along with this program; if not, write to the Free Software
1.22 + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
1.23 + */
1.24 +
1.25 +#include "dialog.h"
1.26 +
1.27 +static void back_lines(int n);
1.28 +static void print_page(WINDOW * win, int height, int width);
1.29 +static void print_line(WINDOW * win, int row, int width);
1.30 +static char *get_line(void);
1.31 +static void print_position(WINDOW * win);
1.32 +
1.33 +static int hscroll;
1.34 +static int begin_reached, end_reached, page_length;
1.35 +static const char *buf;
1.36 +static const char *page;
1.37 +
1.38 +/*
1.39 + * refresh window content
1.40 + */
1.41 +static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
1.42 + int cur_y, int cur_x)
1.43 +{
1.44 + print_page(box, boxh, boxw);
1.45 + print_position(dialog);
1.46 + wmove(dialog, cur_y, cur_x); /* Restore cursor position */
1.47 + wrefresh(dialog);
1.48 +}
1.49 +
1.50 +
1.51 +/*
1.52 + * Display text from a file in a dialog box.
1.53 + */
1.54 +int dialog_textbox(const char *title, const char *tbuf,
1.55 + int initial_height, int initial_width)
1.56 +{
1.57 + int i, x, y, cur_x, cur_y, key = 0;
1.58 + int height, width, boxh, boxw;
1.59 + int passed_end;
1.60 + WINDOW *dialog, *box;
1.61 +
1.62 + begin_reached = 1;
1.63 + end_reached = 0;
1.64 + page_length = 0;
1.65 + hscroll = 0;
1.66 + buf = tbuf;
1.67 + page = buf; /* page is pointer to start of page to be displayed */
1.68 +
1.69 +do_resize:
1.70 + getmaxyx(stdscr, height, width);
1.71 + if (height < 8 || width < 8)
1.72 + return -ERRDISPLAYTOOSMALL;
1.73 + if (initial_height != 0)
1.74 + height = initial_height;
1.75 + else
1.76 + if (height > 4)
1.77 + height -= 4;
1.78 + else
1.79 + height = 0;
1.80 + if (initial_width != 0)
1.81 + width = initial_width;
1.82 + else
1.83 + if (width > 5)
1.84 + width -= 5;
1.85 + else
1.86 + width = 0;
1.87 +
1.88 + /* center dialog box on screen */
1.89 + x = (COLS - width) / 2;
1.90 + y = (LINES - height) / 2;
1.91 +
1.92 + draw_shadow(stdscr, y, x, height, width);
1.93 +
1.94 + dialog = newwin(height, width, y, x);
1.95 + keypad(dialog, TRUE);
1.96 +
1.97 + /* Create window for box region, used for scrolling text */
1.98 + boxh = height - 4;
1.99 + boxw = width - 2;
1.100 + box = subwin(dialog, boxh, boxw, y + 1, x + 1);
1.101 + wattrset(box, dlg.dialog.atr);
1.102 + wbkgdset(box, dlg.dialog.atr & A_COLOR);
1.103 +
1.104 + keypad(box, TRUE);
1.105 +
1.106 + /* register the new window, along with its borders */
1.107 + draw_box(dialog, 0, 0, height, width,
1.108 + dlg.dialog.atr, dlg.border.atr);
1.109 +
1.110 + wattrset(dialog, dlg.border.atr);
1.111 + mvwaddch(dialog, height - 3, 0, ACS_LTEE);
1.112 + for (i = 0; i < width - 2; i++)
1.113 + waddch(dialog, ACS_HLINE);
1.114 + wattrset(dialog, dlg.dialog.atr);
1.115 + wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
1.116 + waddch(dialog, ACS_RTEE);
1.117 +
1.118 + print_title(dialog, title, width);
1.119 +
1.120 + print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
1.121 + wnoutrefresh(dialog);
1.122 + getyx(dialog, cur_y, cur_x); /* Save cursor position */
1.123 +
1.124 + /* Print first page of text */
1.125 + attr_clear(box, boxh, boxw, dlg.dialog.atr);
1.126 + refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
1.127 +
1.128 + while ((key != KEY_ESC) && (key != '\n')) {
1.129 + key = wgetch(dialog);
1.130 + switch (key) {
1.131 + case 'E': /* Exit */
1.132 + case 'e':
1.133 + case 'X':
1.134 + case 'x':
1.135 + delwin(box);
1.136 + delwin(dialog);
1.137 + return 0;
1.138 + case 'g': /* First page */
1.139 + case KEY_HOME:
1.140 + if (!begin_reached) {
1.141 + begin_reached = 1;
1.142 + page = buf;
1.143 + refresh_text_box(dialog, box, boxh, boxw,
1.144 + cur_y, cur_x);
1.145 + }
1.146 + break;
1.147 + case 'G': /* Last page */
1.148 + case KEY_END:
1.149 +
1.150 + end_reached = 1;
1.151 + /* point to last char in buf */
1.152 + page = buf + strlen(buf);
1.153 + back_lines(boxh);
1.154 + refresh_text_box(dialog, box, boxh, boxw,
1.155 + cur_y, cur_x);
1.156 + break;
1.157 + case 'K': /* Previous line */
1.158 + case 'k':
1.159 + case KEY_UP:
1.160 + if (!begin_reached) {
1.161 + back_lines(page_length + 1);
1.162 +
1.163 + /* We don't call print_page() here but use
1.164 + * scrolling to ensure faster screen update.
1.165 + * However, 'end_reached' and 'page_length'
1.166 + * should still be updated, and 'page' should
1.167 + * point to start of next page. This is done
1.168 + * by calling get_line() in the following
1.169 + * 'for' loop. */
1.170 + scrollok(box, TRUE);
1.171 + wscrl(box, -1); /* Scroll box region down one line */
1.172 + scrollok(box, FALSE);
1.173 + page_length = 0;
1.174 + passed_end = 0;
1.175 + for (i = 0; i < boxh; i++) {
1.176 + if (!i) {
1.177 + /* print first line of page */
1.178 + print_line(box, 0, boxw);
1.179 + wnoutrefresh(box);
1.180 + } else
1.181 + /* Called to update 'end_reached' and 'page' */
1.182 + get_line();
1.183 + if (!passed_end)
1.184 + page_length++;
1.185 + if (end_reached && !passed_end)
1.186 + passed_end = 1;
1.187 + }
1.188 +
1.189 + print_position(dialog);
1.190 + wmove(dialog, cur_y, cur_x); /* Restore cursor position */
1.191 + wrefresh(dialog);
1.192 + }
1.193 + break;
1.194 + case 'B': /* Previous page */
1.195 + case 'b':
1.196 + case KEY_PPAGE:
1.197 + if (begin_reached)
1.198 + break;
1.199 + back_lines(page_length + boxh);
1.200 + refresh_text_box(dialog, box, boxh, boxw,
1.201 + cur_y, cur_x);
1.202 + break;
1.203 + case 'J': /* Next line */
1.204 + case 'j':
1.205 + case KEY_DOWN:
1.206 + if (!end_reached) {
1.207 + begin_reached = 0;
1.208 + scrollok(box, TRUE);
1.209 + scroll(box); /* Scroll box region up one line */
1.210 + scrollok(box, FALSE);
1.211 + print_line(box, boxh - 1, boxw);
1.212 + wnoutrefresh(box);
1.213 + print_position(dialog);
1.214 + wmove(dialog, cur_y, cur_x); /* Restore cursor position */
1.215 + wrefresh(dialog);
1.216 + }
1.217 + break;
1.218 + case KEY_NPAGE: /* Next page */
1.219 + case ' ':
1.220 + if (end_reached)
1.221 + break;
1.222 +
1.223 + begin_reached = 0;
1.224 + refresh_text_box(dialog, box, boxh, boxw,
1.225 + cur_y, cur_x);
1.226 + break;
1.227 + case '0': /* Beginning of line */
1.228 + case 'H': /* Scroll left */
1.229 + case 'h':
1.230 + case KEY_LEFT:
1.231 + if (hscroll <= 0)
1.232 + break;
1.233 +
1.234 + if (key == '0')
1.235 + hscroll = 0;
1.236 + else
1.237 + hscroll--;
1.238 + /* Reprint current page to scroll horizontally */
1.239 + back_lines(page_length);
1.240 + refresh_text_box(dialog, box, boxh, boxw,
1.241 + cur_y, cur_x);
1.242 + break;
1.243 + case 'L': /* Scroll right */
1.244 + case 'l':
1.245 + case KEY_RIGHT:
1.246 + if (hscroll >= MAX_LEN)
1.247 + break;
1.248 + hscroll++;
1.249 + /* Reprint current page to scroll horizontally */
1.250 + back_lines(page_length);
1.251 + refresh_text_box(dialog, box, boxh, boxw,
1.252 + cur_y, cur_x);
1.253 + break;
1.254 + case KEY_ESC:
1.255 + key = on_key_esc(dialog);
1.256 + break;
1.257 + case KEY_RESIZE:
1.258 + back_lines(height);
1.259 + delwin(box);
1.260 + delwin(dialog);
1.261 + on_key_resize();
1.262 + goto do_resize;
1.263 + }
1.264 + }
1.265 + delwin(box);
1.266 + delwin(dialog);
1.267 + return key; /* ESC pressed */
1.268 +}
1.269 +
1.270 +/*
1.271 + * Go back 'n' lines in text. Called by dialog_textbox().
1.272 + * 'page' will be updated to point to the desired line in 'buf'.
1.273 + */
1.274 +static void back_lines(int n)
1.275 +{
1.276 + int i;
1.277 +
1.278 + begin_reached = 0;
1.279 + /* Go back 'n' lines */
1.280 + for (i = 0; i < n; i++) {
1.281 + if (*page == '\0') {
1.282 + if (end_reached) {
1.283 + end_reached = 0;
1.284 + continue;
1.285 + }
1.286 + }
1.287 + if (page == buf) {
1.288 + begin_reached = 1;
1.289 + return;
1.290 + }
1.291 + page--;
1.292 + do {
1.293 + if (page == buf) {
1.294 + begin_reached = 1;
1.295 + return;
1.296 + }
1.297 + page--;
1.298 + } while (*page != '\n');
1.299 + page++;
1.300 + }
1.301 +}
1.302 +
1.303 +/*
1.304 + * Print a new page of text. Called by dialog_textbox().
1.305 + */
1.306 +static void print_page(WINDOW * win, int height, int width)
1.307 +{
1.308 + int i, passed_end = 0;
1.309 +
1.310 + page_length = 0;
1.311 + for (i = 0; i < height; i++) {
1.312 + print_line(win, i, width);
1.313 + if (!passed_end)
1.314 + page_length++;
1.315 + if (end_reached && !passed_end)
1.316 + passed_end = 1;
1.317 + }
1.318 + wnoutrefresh(win);
1.319 +}
1.320 +
1.321 +/*
1.322 + * Print a new line of text. Called by dialog_textbox() and print_page().
1.323 + */
1.324 +static void print_line(WINDOW * win, int row, int width)
1.325 +{
1.326 + int y, x;
1.327 + char *line;
1.328 +
1.329 + line = get_line();
1.330 + line += MIN(strlen(line), hscroll); /* Scroll horizontally */
1.331 + wmove(win, row, 0); /* move cursor to correct line */
1.332 + waddch(win, ' ');
1.333 + waddnstr(win, line, MIN(strlen(line), width - 2));
1.334 +
1.335 + getyx(win, y, x);
1.336 + /* Clear 'residue' of previous line */
1.337 +#if OLD_NCURSES
1.338 + {
1.339 + int i;
1.340 + for (i = 0; i < width - x; i++)
1.341 + waddch(win, ' ');
1.342 + }
1.343 +#else
1.344 + wclrtoeol(win);
1.345 +#endif
1.346 +}
1.347 +
1.348 +/*
1.349 + * Return current line of text. Called by dialog_textbox() and print_line().
1.350 + * 'page' should point to start of current line before calling, and will be
1.351 + * updated to point to start of next line.
1.352 + */
1.353 +static char *get_line(void)
1.354 +{
1.355 + int i = 0;
1.356 + static char line[MAX_LEN + 1];
1.357 +
1.358 + end_reached = 0;
1.359 + while (*page != '\n') {
1.360 + if (*page == '\0') {
1.361 + if (!end_reached) {
1.362 + end_reached = 1;
1.363 + break;
1.364 + }
1.365 + } else if (i < MAX_LEN)
1.366 + line[i++] = *(page++);
1.367 + else {
1.368 + /* Truncate lines longer than MAX_LEN characters */
1.369 + if (i == MAX_LEN)
1.370 + line[i++] = '\0';
1.371 + page++;
1.372 + }
1.373 + }
1.374 + if (i <= MAX_LEN)
1.375 + line[i] = '\0';
1.376 + if (!end_reached)
1.377 + page++; /* move pass '\n' */
1.378 +
1.379 + return line;
1.380 +}
1.381 +
1.382 +/*
1.383 + * Print current position
1.384 + */
1.385 +static void print_position(WINDOW * win)
1.386 +{
1.387 + int percent;
1.388 +
1.389 + wattrset(win, dlg.position_indicator.atr);
1.390 + wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
1.391 + percent = (page - buf) * 100 / strlen(buf);
1.392 + wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
1.393 + wprintw(win, "(%3d%%)", percent);
1.394 +}