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1.1 root 1: /*
2: * menubox.c -- implements the menu 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: /*
23: * Changes by Clifford Wolf ([email protected])
24: *
25: * [ 1998-06-13 ]
26: *
27: * *) A bugfix for the Page-Down problem
28: *
29: * *) Formerly when I used Page Down and Page Up, the cursor would be set
30: * to the first position in the menu box. Now lxdialog is a bit
31: * smarter and works more like other menu systems (just have a look at
32: * it).
33: *
34: * *) Formerly if I selected something my scrolling would be broken because
35: * lxdialog is re-invoked by the Menuconfig shell script, can't
36: * remember the last scrolling position, and just sets it so that the
37: * cursor is at the bottom of the box. Now it writes the temporary file
38: * lxdialog.scrltmp which contains this information. The file is
39: * deleted by lxdialog if the user leaves a submenu or enters a new
40: * one, but it would be nice if Menuconfig could make another "rm -f"
41: * just to be sure. Just try it out - you will recognise a difference!
42: *
43: * [ 1998-06-14 ]
44: *
45: * *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
46: * and menus change their size on the fly.
47: *
48: * *) If for some reason the last scrolling position is not saved by
49: * lxdialog, it sets the scrolling so that the selected item is in the
50: * middle of the menu box, not at the bottom.
51: *
52: * 02 January 1999, Michael Elizabeth Chastain ([email protected])
53: * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
54: * This fixes a bug in Menuconfig where using ' ' to descend into menus
55: * would leave mis-synchronized lxdialog.scrltmp files lying around,
56: * fscanf would read in 'scroll', and eventually that value would get used.
57: */
58:
59: #include "dialog.h"
60:
61: static int menu_width, item_x;
62:
63: /*
64: * Print menu item
65: */
66: static void do_print_item(WINDOW * win, const char *item, int line_y,
67: int selected, int hotkey)
68: {
69: int j;
70: char *menu_item = malloc(menu_width + 1);
71:
72: strncpy(menu_item, item, menu_width - item_x);
73: menu_item[menu_width - item_x] = '\0';
74: j = first_alpha(menu_item, "YyNnMmHh");
75:
76: /* Clear 'residue' of last item */
77: wattrset(win, dlg.menubox.atr);
78: wmove(win, line_y, 0);
79: #if OLD_NCURSES
80: {
81: int i;
82: for (i = 0; i < menu_width; i++)
83: waddch(win, ' ');
84: }
85: #else
86: wclrtoeol(win);
87: #endif
88: wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
89: mvwaddstr(win, line_y, item_x, menu_item);
90: if (hotkey) {
91: wattrset(win, selected ? dlg.tag_key_selected.atr
92: : dlg.tag_key.atr);
93: mvwaddch(win, line_y, item_x + j, menu_item[j]);
94: }
95: if (selected) {
96: wmove(win, line_y, item_x + 1);
97: }
98: free(menu_item);
99: wrefresh(win);
100: }
101:
102: #define print_item(index, choice, selected) \
103: do { \
104: item_set(index); \
105: do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
106: } while (0)
107:
108: /*
109: * Print the scroll indicators.
110: */
111: static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
112: int height)
113: {
114: int cur_y, cur_x;
115:
116: getyx(win, cur_y, cur_x);
117:
118: wmove(win, y, x);
119:
120: if (scroll > 0) {
121: wattrset(win, dlg.uarrow.atr);
122: waddch(win, ACS_UARROW);
123: waddstr(win, "(-)");
124: } else {
125: wattrset(win, dlg.menubox.atr);
126: waddch(win, ACS_HLINE);
127: waddch(win, ACS_HLINE);
128: waddch(win, ACS_HLINE);
129: waddch(win, ACS_HLINE);
130: }
131:
132: y = y + height + 1;
133: wmove(win, y, x);
134: wrefresh(win);
135:
136: if ((height < item_no) && (scroll + height < item_no)) {
137: wattrset(win, dlg.darrow.atr);
138: waddch(win, ACS_DARROW);
139: waddstr(win, "(+)");
140: } else {
141: wattrset(win, dlg.menubox_border.atr);
142: waddch(win, ACS_HLINE);
143: waddch(win, ACS_HLINE);
144: waddch(win, ACS_HLINE);
145: waddch(win, ACS_HLINE);
146: }
147:
148: wmove(win, cur_y, cur_x);
149: wrefresh(win);
150: }
151:
152: /*
153: * Display the termination buttons.
154: */
155: static void print_buttons(WINDOW * win, int height, int width, int selected)
156: {
157: int x = width / 2 - 16;
158: int y = height - 2;
159:
160: print_button(win, gettext("Select"), y, x, selected == 0);
161: print_button(win, gettext(" Exit "), y, x + 12, selected == 1);
162: print_button(win, gettext(" Help "), y, x + 24, selected == 2);
163:
164: wmove(win, y, x + 1 + 12 * selected);
165: wrefresh(win);
166: }
167:
168: /* scroll up n lines (n may be negative) */
169: static void do_scroll(WINDOW *win, int *scroll, int n)
170: {
171: /* Scroll menu up */
172: scrollok(win, TRUE);
173: wscrl(win, n);
174: scrollok(win, FALSE);
175: *scroll = *scroll + n;
176: wrefresh(win);
177: }
178:
179: /*
180: * Display a menu for choosing among a number of options
181: */
182: int dialog_menu(const char *title, const char *prompt,
183: const void *selected, int *s_scroll)
184: {
185: int i, j, x, y, box_x, box_y;
186: int height, width, menu_height;
187: int key = 0, button = 0, scroll = 0, choice = 0;
188: int first_item = 0, max_choice;
189: WINDOW *dialog, *menu;
190:
191: do_resize:
192: height = getmaxy(stdscr);
193: width = getmaxx(stdscr);
194: if (height < 15 || width < 65)
195: return -ERRDISPLAYTOOSMALL;
196:
197: height -= 4;
198: width -= 5;
199: menu_height = height - 10;
200:
201: max_choice = MIN(menu_height, item_count());
202:
203: /* center dialog box on screen */
204: x = (COLS - width) / 2;
205: y = (LINES - height) / 2;
206:
207: draw_shadow(stdscr, y, x, height, width);
208:
209: dialog = newwin(height, width, y, x);
210: keypad(dialog, TRUE);
211:
212: draw_box(dialog, 0, 0, height, width,
213: dlg.dialog.atr, dlg.border.atr);
214: wattrset(dialog, dlg.border.atr);
215: mvwaddch(dialog, height - 3, 0, ACS_LTEE);
216: for (i = 0; i < width - 2; i++)
217: waddch(dialog, ACS_HLINE);
218: wattrset(dialog, dlg.dialog.atr);
219: wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
220: waddch(dialog, ACS_RTEE);
221:
222: print_title(dialog, title, width);
223:
224: wattrset(dialog, dlg.dialog.atr);
225: print_autowrap(dialog, prompt, width - 2, 1, 3);
226:
227: menu_width = width - 6;
228: box_y = height - menu_height - 5;
229: box_x = (width - menu_width) / 2 - 1;
230:
231: /* create new window for the menu */
232: menu = subwin(dialog, menu_height, menu_width,
233: y + box_y + 1, x + box_x + 1);
234: keypad(menu, TRUE);
235:
236: /* draw a box around the menu items */
237: draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
238: dlg.menubox_border.atr, dlg.menubox.atr);
239:
240: if (menu_width >= 80)
241: item_x = (menu_width - 70) / 2;
242: else
243: item_x = 4;
244:
245: /* Set choice to default item */
246: item_foreach()
247: if (selected && (selected == item_data()))
248: choice = item_n();
249: /* get the saved scroll info */
250: scroll = *s_scroll;
251: if ((scroll <= choice) && (scroll + max_choice > choice) &&
252: (scroll >= 0) && (scroll + max_choice <= item_count())) {
253: first_item = scroll;
254: choice = choice - scroll;
255: } else {
256: scroll = 0;
257: }
258: if ((choice >= max_choice)) {
259: if (choice >= item_count() - max_choice / 2)
260: scroll = first_item = item_count() - max_choice;
261: else
262: scroll = first_item = choice - max_choice / 2;
263: choice = choice - scroll;
264: }
265:
266: /* Print the menu */
267: for (i = 0; i < max_choice; i++) {
268: print_item(first_item + i, i, i == choice);
269: }
270:
271: wnoutrefresh(menu);
272:
273: print_arrows(dialog, item_count(), scroll,
274: box_y, box_x + item_x + 1, menu_height);
275:
276: print_buttons(dialog, height, width, 0);
277: wmove(menu, choice, item_x + 1);
278: wrefresh(menu);
279:
280: while (key != KEY_ESC) {
281: key = wgetch(menu);
282:
283: if (key < 256 && isalpha(key))
284: key = tolower(key);
285:
286: if (strchr("ynmh", key))
287: i = max_choice;
288: else {
289: for (i = choice + 1; i < max_choice; i++) {
290: item_set(scroll + i);
291: j = first_alpha(item_str(), "YyNnMmHh");
292: if (key == tolower(item_str()[j]))
293: break;
294: }
295: if (i == max_choice)
296: for (i = 0; i < max_choice; i++) {
297: item_set(scroll + i);
298: j = first_alpha(item_str(), "YyNnMmHh");
299: if (key == tolower(item_str()[j]))
300: break;
301: }
302: }
303:
304: if (i < max_choice ||
305: key == KEY_UP || key == KEY_DOWN ||
306: key == '-' || key == '+' ||
307: key == KEY_PPAGE || key == KEY_NPAGE) {
308: /* Remove highligt of current item */
309: print_item(scroll + choice, choice, FALSE);
310:
311: if (key == KEY_UP || key == '-') {
312: if (choice < 2 && scroll) {
313: /* Scroll menu down */
314: do_scroll(menu, &scroll, -1);
315:
316: print_item(scroll, 0, FALSE);
317: } else
318: choice = MAX(choice - 1, 0);
319:
320: } else if (key == KEY_DOWN || key == '+') {
321: print_item(scroll+choice, choice, FALSE);
322:
323: if ((choice > max_choice - 3) &&
324: (scroll + max_choice < item_count())) {
325: /* Scroll menu up */
326: do_scroll(menu, &scroll, 1);
327:
328: print_item(scroll+max_choice - 1,
329: max_choice - 1, FALSE);
330: } else
331: choice = MIN(choice + 1, max_choice - 1);
332:
333: } else if (key == KEY_PPAGE) {
334: scrollok(menu, TRUE);
335: for (i = 0; (i < max_choice); i++) {
336: if (scroll > 0) {
337: do_scroll(menu, &scroll, -1);
338: print_item(scroll, 0, FALSE);
339: } else {
340: if (choice > 0)
341: choice--;
342: }
343: }
344:
345: } else if (key == KEY_NPAGE) {
346: for (i = 0; (i < max_choice); i++) {
347: if (scroll + max_choice < item_count()) {
348: do_scroll(menu, &scroll, 1);
349: print_item(scroll+max_choice-1,
350: max_choice - 1, FALSE);
351: } else {
352: if (choice + 1 < max_choice)
353: choice++;
354: }
355: }
356: } else
357: choice = i;
358:
359: print_item(scroll + choice, choice, TRUE);
360:
361: print_arrows(dialog, item_count(), scroll,
362: box_y, box_x + item_x + 1, menu_height);
363:
364: wnoutrefresh(dialog);
365: wrefresh(menu);
366:
367: continue; /* wait for another key press */
368: }
369:
370: switch (key) {
371: case KEY_LEFT:
372: case TAB:
373: case KEY_RIGHT:
374: button = ((key == KEY_LEFT ? --button : ++button) < 0)
375: ? 2 : (button > 2 ? 0 : button);
376:
377: print_buttons(dialog, height, width, button);
378: wrefresh(menu);
379: break;
380: case ' ':
381: case 's':
382: case 'y':
383: case 'n':
384: case 'm':
385: case '/':
386: case 'h':
387: case '?':
388: case 'z':
389: case '\n':
390: /* save scroll info */
391: *s_scroll = scroll;
392: delwin(menu);
393: delwin(dialog);
394: item_set(scroll + choice);
395: item_set_selected(1);
396: switch (key) {
397: case 'h':
398: case '?':
399: return 2;
400: case 's':
401: case 'y':
402: return 3;
403: case 'n':
404: return 4;
405: case 'm':
406: return 5;
407: case ' ':
408: return 6;
409: case '/':
410: return 7;
411: case 'z':
412: return 8;
413: case '\n':
414: return button;
415: }
416: return 0;
417: case 'e':
418: case 'x':
419: key = KEY_ESC;
420: break;
421: case KEY_ESC:
422: key = on_key_esc(menu);
423: break;
424: case KEY_RESIZE:
425: on_key_resize();
426: delwin(menu);
427: delwin(dialog);
428: goto do_resize;
429: }
430: }
431: delwin(menu);
432: delwin(dialog);
433: return key; /* ESC pressed */
434: }
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