Root/scripts/kconfig/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
61static int menu_width, item_x;
62
63/*
64 * Print menu item
65 */
66static 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) \
103do { \
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 */
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, 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 */
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, 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) */
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,
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
191do_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}
435

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