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, update_text_fn
26 update_text, void *data);
27 static void print_line(WINDOW *win, int row, int width);
28 static char *get_line(void);
29 static void print_position(WINDOW * win);
30
31 static int hscroll;
32 static int begin_reached, end_reached, page_length;
33 static char *buf;
34 static char *page;
35
36 /*
37 * refresh window content
38 */
refresh_text_box(WINDOW * dialog,WINDOW * box,int boxh,int boxw,int cur_y,int cur_x,update_text_fn update_text,void * data)39 static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
40 int cur_y, int cur_x, update_text_fn update_text,
41 void *data)
42 {
43 print_page(box, boxh, boxw, update_text, data);
44 print_position(dialog);
45 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
46 wrefresh(dialog);
47 }
48
49
50 /*
51 * Display text from a file in a dialog box.
52 *
53 * keys is a null-terminated array
54 * update_text() may not add or remove any '\n' or '\0' in tbuf
55 */
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)56 int dialog_textbox(const char *title, char *tbuf, int initial_height,
57 int initial_width, int *keys, int *_vscroll, int *_hscroll,
58 update_text_fn update_text, void *data)
59 {
60 int i, x, y, cur_x, cur_y, key = 0;
61 int height, width, boxh, boxw;
62 WINDOW *dialog, *box;
63 bool done = false;
64
65 begin_reached = 1;
66 end_reached = 0;
67 page_length = 0;
68 hscroll = 0;
69 buf = tbuf;
70 page = buf; /* page is pointer to start of page to be displayed */
71
72 if (_vscroll && *_vscroll) {
73 begin_reached = 0;
74
75 for (i = 0; i < *_vscroll; i++)
76 get_line();
77 }
78 if (_hscroll)
79 hscroll = *_hscroll;
80
81 do_resize:
82 getmaxyx(stdscr, height, width);
83 if (height < TEXTBOX_HEIGTH_MIN || width < TEXTBOX_WIDTH_MIN)
84 return -ERRDISPLAYTOOSMALL;
85 if (initial_height != 0)
86 height = initial_height;
87 else
88 if (height > 4)
89 height -= 4;
90 else
91 height = 0;
92 if (initial_width != 0)
93 width = initial_width;
94 else
95 if (width > 5)
96 width -= 5;
97 else
98 width = 0;
99
100 /* center dialog box on screen */
101 x = (getmaxx(stdscr) - width) / 2;
102 y = (getmaxy(stdscr) - height) / 2;
103
104 draw_shadow(stdscr, y, x, height, width);
105
106 dialog = newwin(height, width, y, x);
107 keypad(dialog, TRUE);
108
109 /* Create window for box region, used for scrolling text */
110 boxh = height - 4;
111 boxw = width - 2;
112 box = subwin(dialog, boxh, boxw, y + 1, x + 1);
113 wattrset(box, dlg.dialog.atr);
114 wbkgdset(box, dlg.dialog.atr & A_COLOR);
115
116 keypad(box, TRUE);
117
118 /* register the new window, along with its borders */
119 draw_box(dialog, 0, 0, height, width,
120 dlg.dialog.atr, dlg.border.atr);
121
122 wattrset(dialog, dlg.border.atr);
123 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
124 for (i = 0; i < width - 2; i++)
125 waddch(dialog, ACS_HLINE);
126 wattrset(dialog, dlg.dialog.atr);
127 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
128 waddch(dialog, ACS_RTEE);
129
130 print_title(dialog, title, width);
131
132 print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE);
133 wnoutrefresh(dialog);
134 getyx(dialog, cur_y, cur_x); /* Save cursor position */
135
136 /* Print first page of text */
137 attr_clear(box, boxh, boxw, dlg.dialog.atr);
138 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text,
139 data);
140
141 while (!done) {
142 key = wgetch(dialog);
143 switch (key) {
144 case 'E': /* Exit */
145 case 'e':
146 case 'X':
147 case 'x':
148 case 'q':
149 case '\n':
150 done = true;
151 break;
152 case 'g': /* First page */
153 case KEY_HOME:
154 if (!begin_reached) {
155 begin_reached = 1;
156 page = buf;
157 refresh_text_box(dialog, box, boxh, boxw,
158 cur_y, cur_x, update_text,
159 data);
160 }
161 break;
162 case 'G': /* Last page */
163 case KEY_END:
164
165 end_reached = 1;
166 /* point to last char in buf */
167 page = buf + strlen(buf);
168 back_lines(boxh);
169 refresh_text_box(dialog, box, boxh, boxw, cur_y,
170 cur_x, update_text, data);
171 break;
172 case 'K': /* Previous line */
173 case 'k':
174 case KEY_UP:
175 if (begin_reached)
176 break;
177
178 back_lines(page_length + 1);
179 refresh_text_box(dialog, box, boxh, boxw, cur_y,
180 cur_x, update_text, data);
181 break;
182 case 'B': /* Previous page */
183 case 'b':
184 case 'u':
185 case KEY_PPAGE:
186 if (begin_reached)
187 break;
188 back_lines(page_length + boxh);
189 refresh_text_box(dialog, box, boxh, boxw, cur_y,
190 cur_x, update_text, data);
191 break;
192 case 'J': /* Next line */
193 case 'j':
194 case KEY_DOWN:
195 if (end_reached)
196 break;
197
198 back_lines(page_length - 1);
199 refresh_text_box(dialog, box, boxh, boxw, cur_y,
200 cur_x, update_text, data);
201 break;
202 case KEY_NPAGE: /* Next page */
203 case ' ':
204 case 'd':
205 if (end_reached)
206 break;
207
208 begin_reached = 0;
209 refresh_text_box(dialog, box, boxh, boxw, cur_y,
210 cur_x, update_text, data);
211 break;
212 case '0': /* Beginning of line */
213 case 'H': /* Scroll left */
214 case 'h':
215 case KEY_LEFT:
216 if (hscroll <= 0)
217 break;
218
219 if (key == '0')
220 hscroll = 0;
221 else
222 hscroll--;
223 /* Reprint current page to scroll horizontally */
224 back_lines(page_length);
225 refresh_text_box(dialog, box, boxh, boxw, cur_y,
226 cur_x, update_text, data);
227 break;
228 case 'L': /* Scroll right */
229 case 'l':
230 case KEY_RIGHT:
231 if (hscroll >= MAX_LEN)
232 break;
233 hscroll++;
234 /* Reprint current page to scroll horizontally */
235 back_lines(page_length);
236 refresh_text_box(dialog, box, boxh, boxw, cur_y,
237 cur_x, update_text, data);
238 break;
239 case KEY_ESC:
240 if (on_key_esc(dialog) == KEY_ESC)
241 done = true;
242 break;
243 case KEY_RESIZE:
244 back_lines(height);
245 delwin(box);
246 delwin(dialog);
247 on_key_resize();
248 goto do_resize;
249 default:
250 for (i = 0; keys[i]; i++) {
251 if (key == keys[i]) {
252 done = true;
253 break;
254 }
255 }
256 }
257 }
258 delwin(box);
259 delwin(dialog);
260 if (_vscroll) {
261 const char *s;
262
263 s = buf;
264 *_vscroll = 0;
265 back_lines(page_length);
266 while (s < page && (s = strchr(s, '\n'))) {
267 (*_vscroll)++;
268 s++;
269 }
270 }
271 if (_hscroll)
272 *_hscroll = hscroll;
273 return key;
274 }
275
276 /*
277 * Go back 'n' lines in text. Called by dialog_textbox().
278 * 'page' will be updated to point to the desired line in 'buf'.
279 */
back_lines(int n)280 static void back_lines(int n)
281 {
282 int i;
283
284 begin_reached = 0;
285 /* Go back 'n' lines */
286 for (i = 0; i < n; i++) {
287 if (*page == '\0') {
288 if (end_reached) {
289 end_reached = 0;
290 continue;
291 }
292 }
293 if (page == buf) {
294 begin_reached = 1;
295 return;
296 }
297 page--;
298 do {
299 if (page == buf) {
300 begin_reached = 1;
301 return;
302 }
303 page--;
304 } while (*page != '\n');
305 page++;
306 }
307 }
308
309 /*
310 * Print a new page of text.
311 */
print_page(WINDOW * win,int height,int width,update_text_fn update_text,void * data)312 static void print_page(WINDOW *win, int height, int width, update_text_fn
313 update_text, void *data)
314 {
315 int i, passed_end = 0;
316
317 if (update_text) {
318 char *end;
319
320 for (i = 0; i < height; i++)
321 get_line();
322 end = page;
323 back_lines(height);
324 update_text(buf, page - buf, end - buf, data);
325 }
326
327 page_length = 0;
328 for (i = 0; i < height; i++) {
329 print_line(win, i, width);
330 if (!passed_end)
331 page_length++;
332 if (end_reached && !passed_end)
333 passed_end = 1;
334 }
335 wnoutrefresh(win);
336 }
337
338 /*
339 * Print a new line of text.
340 */
print_line(WINDOW * win,int row,int width)341 static void print_line(WINDOW * win, int row, int width)
342 {
343 char *line;
344
345 line = get_line();
346 line += MIN(strlen(line), hscroll); /* Scroll horizontally */
347 wmove(win, row, 0); /* move cursor to correct line */
348 waddch(win, ' ');
349 waddnstr(win, line, MIN(strlen(line), width - 2));
350
351 /* Clear 'residue' of previous line */
352 #if OLD_NCURSES
353 {
354 int x = getcurx(win);
355 int i;
356 for (i = 0; i < width - x; i++)
357 waddch(win, ' ');
358 }
359 #else
360 wclrtoeol(win);
361 #endif
362 }
363
364 /*
365 * Return current line of text. Called by dialog_textbox() and print_line().
366 * 'page' should point to start of current line before calling, and will be
367 * updated to point to start of next line.
368 */
get_line(void)369 static char *get_line(void)
370 {
371 int i = 0;
372 static char line[MAX_LEN + 1];
373
374 end_reached = 0;
375 while (*page != '\n') {
376 if (*page == '\0') {
377 end_reached = 1;
378 break;
379 } else if (i < MAX_LEN)
380 line[i++] = *(page++);
381 else {
382 /* Truncate lines longer than MAX_LEN characters */
383 if (i == MAX_LEN)
384 line[i++] = '\0';
385 page++;
386 }
387 }
388 if (i <= MAX_LEN)
389 line[i] = '\0';
390 if (!end_reached)
391 page++; /* move past '\n' */
392
393 return line;
394 }
395
396 /*
397 * Print current position
398 */
print_position(WINDOW * win)399 static void print_position(WINDOW * win)
400 {
401 int percent;
402
403 wattrset(win, dlg.position_indicator.atr);
404 wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
405 percent = (page - buf) * 100 / strlen(buf);
406 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
407 wprintw(win, "(%3d%%)", percent);
408 }
409