2 * textbox.c -- implements the text box
4 * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
5 * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
7 * SPDX-License-Identifier: GPL-2.0+
12 static void back_lines(int n);
13 static void print_page(WINDOW *win, int height, int width, update_text_fn
14 update_text, void *data);
15 static void print_line(WINDOW *win, int row, int width);
16 static char *get_line(void);
17 static void print_position(WINDOW * win);
20 static int begin_reached, end_reached, page_length;
25 * refresh window content
27 static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
28 int cur_y, int cur_x, update_text_fn update_text,
31 print_page(box, boxh, boxw, update_text, data);
32 print_position(dialog);
33 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
39 * Display text from a file in a dialog box.
41 * keys is a null-terminated array
42 * update_text() may not add or remove any '\n' or '\0' in tbuf
44 int dialog_textbox(const char *title, char *tbuf, int initial_height,
45 int initial_width, int *keys, int *_vscroll, int *_hscroll,
46 update_text_fn update_text, void *data)
48 int i, x, y, cur_x, cur_y, key = 0;
49 int height, width, boxh, boxw;
58 page = buf; /* page is pointer to start of page to be displayed */
60 if (_vscroll && *_vscroll) {
63 for (i = 0; i < *_vscroll; i++)
70 getmaxyx(stdscr, height, width);
71 if (height < TEXTBOX_HEIGTH_MIN || width < TEXTBOX_WIDTH_MIN)
72 return -ERRDISPLAYTOOSMALL;
73 if (initial_height != 0)
74 height = initial_height;
80 if (initial_width != 0)
81 width = initial_width;
88 /* center dialog box on screen */
89 x = (getmaxx(stdscr) - width) / 2;
90 y = (getmaxy(stdscr) - height) / 2;
92 draw_shadow(stdscr, y, x, height, width);
94 dialog = newwin(height, width, y, x);
97 /* Create window for box region, used for scrolling text */
100 box = subwin(dialog, boxh, boxw, y + 1, x + 1);
101 wattrset(box, dlg.dialog.atr);
102 wbkgdset(box, dlg.dialog.atr & A_COLOR);
106 /* register the new window, along with its borders */
107 draw_box(dialog, 0, 0, height, width,
108 dlg.dialog.atr, dlg.border.atr);
110 wattrset(dialog, dlg.border.atr);
111 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
112 for (i = 0; i < width - 2; i++)
113 waddch(dialog, ACS_HLINE);
114 wattrset(dialog, dlg.dialog.atr);
115 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
116 waddch(dialog, ACS_RTEE);
118 print_title(dialog, title, width);
120 print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE);
121 wnoutrefresh(dialog);
122 getyx(dialog, cur_y, cur_x); /* Save cursor position */
124 /* Print first page of text */
125 attr_clear(box, boxh, boxw, dlg.dialog.atr);
126 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text,
130 key = wgetch(dialog);
140 case 'g': /* First page */
142 if (!begin_reached) {
145 refresh_text_box(dialog, box, boxh, boxw,
146 cur_y, cur_x, update_text,
150 case 'G': /* Last page */
154 /* point to last char in buf */
155 page = buf + strlen(buf);
157 refresh_text_box(dialog, box, boxh, boxw, cur_y,
158 cur_x, update_text, data);
160 case 'K': /* Previous line */
166 back_lines(page_length + 1);
167 refresh_text_box(dialog, box, boxh, boxw, cur_y,
168 cur_x, update_text, data);
170 case 'B': /* Previous page */
176 back_lines(page_length + boxh);
177 refresh_text_box(dialog, box, boxh, boxw, cur_y,
178 cur_x, update_text, data);
180 case 'J': /* Next line */
186 back_lines(page_length - 1);
187 refresh_text_box(dialog, box, boxh, boxw, cur_y,
188 cur_x, update_text, data);
190 case KEY_NPAGE: /* Next page */
197 refresh_text_box(dialog, box, boxh, boxw, cur_y,
198 cur_x, update_text, data);
200 case '0': /* Beginning of line */
201 case 'H': /* Scroll left */
211 /* Reprint current page to scroll horizontally */
212 back_lines(page_length);
213 refresh_text_box(dialog, box, boxh, boxw, cur_y,
214 cur_x, update_text, data);
216 case 'L': /* Scroll right */
219 if (hscroll >= MAX_LEN)
222 /* Reprint current page to scroll horizontally */
223 back_lines(page_length);
224 refresh_text_box(dialog, box, boxh, boxw, cur_y,
225 cur_x, update_text, data);
228 if (on_key_esc(dialog) == KEY_ESC)
238 for (i = 0; keys[i]; i++) {
239 if (key == keys[i]) {
253 back_lines(page_length);
254 while (s < page && (s = strchr(s, '\n'))) {
265 * Go back 'n' lines in text. Called by dialog_textbox().
266 * 'page' will be updated to point to the desired line in 'buf'.
268 static void back_lines(int n)
273 /* Go back 'n' lines */
274 for (i = 0; i < n; i++) {
292 } while (*page != '\n');
298 * Print a new page of text.
300 static void print_page(WINDOW *win, int height, int width, update_text_fn
301 update_text, void *data)
303 int i, passed_end = 0;
308 for (i = 0; i < height; i++)
312 update_text(buf, page - buf, end - buf, data);
316 for (i = 0; i < height; i++) {
317 print_line(win, i, width);
320 if (end_reached && !passed_end)
327 * Print a new line of text.
329 static void print_line(WINDOW * win, int row, int width)
334 line += MIN(strlen(line), hscroll); /* Scroll horizontally */
335 wmove(win, row, 0); /* move cursor to correct line */
337 waddnstr(win, line, MIN(strlen(line), width - 2));
339 /* Clear 'residue' of previous line */
342 int x = getcurx(win);
344 for (i = 0; i < width - x; i++)
353 * Return current line of text. Called by dialog_textbox() and print_line().
354 * 'page' should point to start of current line before calling, and will be
355 * updated to point to start of next line.
357 static char *get_line(void)
360 static char line[MAX_LEN + 1];
363 while (*page != '\n') {
367 } else if (i < MAX_LEN)
368 line[i++] = *(page++);
370 /* Truncate lines longer than MAX_LEN characters */
379 page++; /* move past '\n' */
385 * Print current position
387 static void print_position(WINDOW * win)
391 wattrset(win, dlg.position_indicator.atr);
392 wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
393 percent = (page - buf) * 100 / strlen(buf);
394 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
395 wprintw(win, "(%3d%%)", percent);