Root/scripts/config/lxdialog/menubox.c

1/*
2 * menubox.c -- implements the menu box
3 *
4 * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
5 * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@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/*
23 * Changes by Clifford Wolf (god@clifford.at)
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 (mec@shout.net)
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#define ITEM_IDENT 1 /* Indent of menu entries. Fixed for all menus */
62static int menu_width;
63
64/*
65 * Print menu item
66 */
67static void do_print_item(WINDOW * win, const char *item, int choice,
68                          int selected, int hotkey)
69{
70    int j;
71    char *menu_item = malloc(menu_width + 1);
72
73    strncpy(menu_item, item, menu_width - ITEM_IDENT);
74    menu_item[menu_width] = 0;
75    j = first_alpha(menu_item, "YyNnMmHh");
76
77    /* Clear 'residue' of last item */
78    wattrset(win, menubox_attr);
79    wmove(win, choice, 0);
80#if OLD_NCURSES
81    {
82        int i;
83        for (i = 0; i < menu_width; i++)
84            waddch(win, ' ');
85    }
86#else
87    wclrtoeol(win);
88#endif
89    wattrset(win, selected ? item_selected_attr : item_attr);
90    mvwaddstr(win, choice, ITEM_IDENT, menu_item);
91    if (hotkey) {
92        wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
93        mvwaddch(win, choice, ITEM_IDENT + j, menu_item[j]);
94    }
95    if (selected) {
96        wmove(win, choice, ITEM_IDENT + 1);
97    }
98    free(menu_item);
99    wrefresh(win);
100}
101
102#define print_item(index, choice, selected) \
103do {\
104    int hotkey = (items[(index) * 2][0] != ':'); \
105    do_print_item(menu, items[(index) * 2 + 1], choice, selected, hotkey); \
106} while (0)
107
108/*
109 * Print the scroll indicators.
110 */
111static 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, uarrow_attr);
122        waddch(win, ACS_UARROW);
123        waddstr(win, "(-)");
124    } else {
125        wattrset(win, menubox_attr);
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, darrow_attr);
138        waddch(win, ACS_DARROW);
139        waddstr(win, "(+)");
140    } else {
141        wattrset(win, menubox_border_attr);
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 */
155static 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, "Select", y, x, selected == 0);
161    print_button(win, " Exit ", y, x + 12, selected == 1);
162    print_button(win, " 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) */
169static 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 */
182int dialog_menu(const char *title, const char *prompt, int height, int width,
183                int menu_height, const char *current, int item_no,
184                const char *const *items)
185{
186    int i, j, x, y, box_x, box_y;
187    int key = 0, button = 0, scroll = 0, choice = 0;
188    int first_item = 0, max_choice;
189    WINDOW *dialog, *menu;
190    FILE *f;
191
192    max_choice = MIN(menu_height, item_no);
193
194    /* center dialog box on screen */
195    x = (COLS - width) / 2;
196    y = (LINES - height) / 2;
197
198    draw_shadow(stdscr, y, x, height, width);
199
200    dialog = newwin(height, width, y, x);
201    keypad(dialog, TRUE);
202
203    draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
204    wattrset(dialog, border_attr);
205    mvwaddch(dialog, height - 3, 0, ACS_LTEE);
206    for (i = 0; i < width - 2; i++)
207        waddch(dialog, ACS_HLINE);
208    wattrset(dialog, dialog_attr);
209    wbkgdset(dialog, dialog_attr & A_COLOR);
210    waddch(dialog, ACS_RTEE);
211
212    print_title(dialog, title, width);
213
214    wattrset(dialog, dialog_attr);
215    print_autowrap(dialog, prompt, width - 2, 1, 3);
216
217    menu_width = width - 6;
218    box_y = height - menu_height - 5;
219    box_x = (width - menu_width) / 2 - 1;
220
221    /* create new window for the menu */
222    menu = subwin(dialog, menu_height, menu_width,
223              y + box_y + 1, x + box_x + 1);
224    keypad(menu, TRUE);
225
226    /* draw a box around the menu items */
227    draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
228         menubox_border_attr, menubox_attr);
229
230    /* Set choice to default item */
231    for (i = 0; i < item_no; i++)
232        if (strcmp(current, items[i * 2]) == 0)
233            choice = i;
234
235    /* get the scroll info from the temp file */
236    if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) {
237        if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) &&
238            (scroll + max_choice > choice) && (scroll >= 0) &&
239            (scroll + max_choice <= item_no)) {
240            first_item = scroll;
241            choice = choice - scroll;
242            fclose(f);
243        } else {
244            scroll = 0;
245            remove("lxdialog.scrltmp");
246            fclose(f);
247            f = NULL;
248        }
249    }
250    if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) {
251        if (choice >= item_no - max_choice / 2)
252            scroll = first_item = item_no - max_choice;
253        else
254            scroll = first_item = choice - max_choice / 2;
255        choice = choice - scroll;
256    }
257
258    /* Print the menu */
259    for (i = 0; i < max_choice; i++) {
260        print_item(first_item + i, i, i == choice);
261    }
262
263    wnoutrefresh(menu);
264
265    print_arrows(dialog, item_no, scroll,
266             box_y, box_x + ITEM_IDENT + 1, menu_height);
267
268    print_buttons(dialog, height, width, 0);
269    wmove(menu, choice, ITEM_IDENT + 1);
270    wrefresh(menu);
271
272    while (key != ESC) {
273        key = wgetch(menu);
274
275        if (key < 256 && isalpha(key))
276            key = tolower(key);
277
278        if (strchr("ynmh", key))
279            i = max_choice;
280        else {
281            for (i = choice + 1; i < max_choice; i++) {
282                j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh");
283                if (key == tolower(items[(scroll + i) * 2 + 1][j]))
284                    break;
285            }
286            if (i == max_choice)
287                for (i = 0; i < max_choice; i++) {
288                    j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh");
289                    if (key == tolower(items[(scroll + i) * 2 + 1][j]))
290                        break;
291                }
292        }
293
294        if (i < max_choice ||
295            key == KEY_UP || key == KEY_DOWN ||
296            key == '-' || key == '+' ||
297            key == KEY_PPAGE || key == KEY_NPAGE) {
298            /* Remove highligt of current item */
299            print_item(scroll + choice, choice, FALSE);
300
301            if (key == KEY_UP || key == '-') {
302                if (choice < 2 && scroll) {
303                    /* Scroll menu down */
304                    do_scroll(menu, &scroll, -1);
305
306                    print_item(scroll, 0, FALSE);
307                } else
308                    choice = MAX(choice - 1, 0);
309
310            } else if (key == KEY_DOWN || key == '+') {
311                print_item(scroll+choice, choice, FALSE);
312
313                if ((choice > max_choice - 3) &&
314                    (scroll + max_choice < item_no)) {
315                    /* Scroll menu up */
316                    do_scroll(menu, &scroll, 1);
317
318                    print_item(scroll+max_choice - 1,
319                           max_choice - 1, FALSE);
320                } else
321                    choice = MIN(choice + 1, max_choice - 1);
322
323            } else if (key == KEY_PPAGE) {
324                scrollok(menu, TRUE);
325                for (i = 0; (i < max_choice); i++) {
326                    if (scroll > 0) {
327                        do_scroll(menu, &scroll, -1);
328                        print_item(scroll, 0, FALSE);
329                    } else {
330                        if (choice > 0)
331                            choice--;
332                    }
333                }
334
335            } else if (key == KEY_NPAGE) {
336                for (i = 0; (i < max_choice); i++) {
337                    if (scroll + max_choice < item_no) {
338                        do_scroll(menu, &scroll, 1);
339                        print_item(scroll+max_choice-1,
340                               max_choice - 1, FALSE);
341                    } else {
342                        if (choice + 1 < max_choice)
343                            choice++;
344                    }
345                }
346            } else
347                choice = i;
348
349            print_item(scroll + choice, choice, TRUE);
350
351            print_arrows(dialog, item_no, scroll,
352                     box_y, box_x + ITEM_IDENT + 1, menu_height);
353
354            wnoutrefresh(dialog);
355            wrefresh(menu);
356
357            continue; /* wait for another key press */
358        }
359
360        switch (key) {
361        case KEY_LEFT:
362        case TAB:
363        case KEY_RIGHT:
364            button = ((key == KEY_LEFT ? --button : ++button) < 0)
365                ? 2 : (button > 2 ? 0 : button);
366
367            print_buttons(dialog, height, width, button);
368            wrefresh(menu);
369            break;
370        case ' ':
371        case 's':
372        case 'y':
373        case 'n':
374        case 'm':
375        case '/':
376            /* save scroll info */
377            if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) {
378                fprintf(f, "%d\n", scroll);
379                fclose(f);
380            }
381            delwin(dialog);
382            fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
383            switch (key) {
384            case 's':
385                return 3;
386            case 'y':
387                return 3;
388            case 'n':
389                return 4;
390            case 'm':
391                return 5;
392            case ' ':
393                return 6;
394            case '/':
395                return 7;
396            }
397            return 0;
398        case 'h':
399        case '?':
400            button = 2;
401        case '\n':
402            delwin(dialog);
403            if (button == 2)
404                fprintf(stderr, "%s \"%s\"\n",
405                    items[(scroll + choice) * 2],
406                    items[(scroll + choice) * 2 + 1] +
407                    first_alpha(items [(scroll + choice) * 2 + 1], ""));
408            else
409                fprintf(stderr, "%s\n",
410                    items[(scroll + choice) * 2]);
411
412            remove("lxdialog.scrltmp");
413            return button;
414        case 'e':
415        case 'x':
416            key = ESC;
417        case ESC:
418            break;
419        }
420    }
421
422    delwin(dialog);
423    remove("lxdialog.scrltmp");
424    return -1; /* ESC pressed */
425}
426

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