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Return to textbox.c CVS log | Up to [Qemu by Fabrice Bellard] / qemu / roms / seabios / tools / kconfig / lxdialog |
1.1 root 1: /*
2: * textbox.c -- implements the text box
3: *
4: * ORIGINAL AUTHOR: Savio Lam ([email protected])
5: * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected])
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: }
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