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- /*
- * menubox.c -- implements the menu box
- *
- * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
- * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- * Changes by Clifford Wolf (god@clifford.at)
- *
- * [ 1998-06-13 ]
- *
- * *) A bugfix for the Page-Down problem
- *
- * *) Formerly when I used Page Down and Page Up, the cursor would be set
- * to the first position in the menu box. Now lxdialog is a bit
- * smarter and works more like other menu systems (just have a look at
- * it).
- *
- * *) Formerly if I selected something my scrolling would be broken because
- * lxdialog is re-invoked by the Menuconfig shell script, can't
- * remember the last scrolling position, and just sets it so that the
- * cursor is at the bottom of the box. Now it writes the temporary file
- * lxdialog.scrltmp which contains this information. The file is
- * deleted by lxdialog if the user leaves a submenu or enters a new
- * one, but it would be nice if Menuconfig could make another "rm -f"
- * just to be sure. Just try it out - you will recognise a difference!
- *
- * [ 1998-06-14 ]
- *
- * *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
- * and menus change their size on the fly.
- *
- * *) If for some reason the last scrolling position is not saved by
- * lxdialog, it sets the scrolling so that the selected item is in the
- * middle of the menu box, not at the bottom.
- *
- * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
- * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
- * This fixes a bug in Menuconfig where using ' ' to descend into menus
- * would leave mis-synchronized lxdialog.scrltmp files lying around,
- * fscanf would read in 'scroll', and eventually that value would get used.
- */
- #include "dialog.h"
- static int menu_width, item_x;
- /*
- * Print menu item
- */
- static void do_print_item(WINDOW * win, const char *item, int line_y,
- int selected, int hotkey)
- {
- int j;
- char *menu_item = malloc(menu_width + 1);
- strncpy(menu_item, item, menu_width - item_x);
- menu_item[menu_width - item_x] = '\0';
- j = first_alpha(menu_item, "YyNnMmHh");
- /* Clear 'residue' of last item */
- wattrset(win, dlg.menubox.atr);
- wmove(win, line_y, 0);
- #if OLD_NCURSES
- {
- int i;
- for (i = 0; i < menu_width; i++)
- waddch(win, ' ');
- }
- #else
- wclrtoeol(win);
- #endif
- wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
- mvwaddstr(win, line_y, item_x, menu_item);
- if (hotkey) {
- wattrset(win, selected ? dlg.tag_key_selected.atr
- : dlg.tag_key.atr);
- mvwaddch(win, line_y, item_x + j, menu_item[j]);
- }
- if (selected) {
- wmove(win, line_y, item_x + 1);
- }
- free(menu_item);
- wrefresh(win);
- }
- #define print_item(index, choice, selected) \
- do { \
- item_set(index); \
- do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
- } while (0)
- /*
- * Print the scroll indicators.
- */
- static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
- int height)
- {
- int cur_y, cur_x;
- getyx(win, cur_y, cur_x);
- wmove(win, y, x);
- if (scroll > 0) {
- wattrset(win, dlg.uarrow.atr);
- waddch(win, ACS_UARROW);
- waddstr(win, "(-)");
- } else {
- wattrset(win, dlg.menubox.atr);
- waddch(win, ACS_HLINE);
- waddch(win, ACS_HLINE);
- waddch(win, ACS_HLINE);
- waddch(win, ACS_HLINE);
- }
- y = y + height + 1;
- wmove(win, y, x);
- wrefresh(win);
- if ((height < item_no) && (scroll + height < item_no)) {
- wattrset(win, dlg.darrow.atr);
- waddch(win, ACS_DARROW);
- waddstr(win, "(+)");
- } else {
- wattrset(win, dlg.menubox_border.atr);
- waddch(win, ACS_HLINE);
- waddch(win, ACS_HLINE);
- waddch(win, ACS_HLINE);
- waddch(win, ACS_HLINE);
- }
- wmove(win, cur_y, cur_x);
- wrefresh(win);
- }
- /*
- * Display the termination buttons.
- */
- static void print_buttons(WINDOW * win, int height, int width, int selected)
- {
- int x = width / 2 - 28;
- int y = height - 2;
- print_button(win, gettext("Select"), y, x, selected == 0);
- print_button(win, gettext(" Exit "), y, x + 12, selected == 1);
- print_button(win, gettext(" Help "), y, x + 24, selected == 2);
- print_button(win, gettext(" Save "), y, x + 36, selected == 3);
- print_button(win, gettext(" Load "), y, x + 48, selected == 4);
- wmove(win, y, x + 1 + 12 * selected);
- wrefresh(win);
- }
- /* scroll up n lines (n may be negative) */
- static void do_scroll(WINDOW *win, int *scroll, int n)
- {
- /* Scroll menu up */
- scrollok(win, TRUE);
- wscrl(win, n);
- scrollok(win, FALSE);
- *scroll = *scroll + n;
- wrefresh(win);
- }
- /*
- * Display a menu for choosing among a number of options
- */
- int dialog_menu(const char *title, const char *prompt,
- const void *selected, int *s_scroll)
- {
- int i, j, x, y, box_x, box_y;
- int height, width, menu_height;
- int key = 0, button = 0, scroll = 0, choice = 0;
- int first_item = 0, max_choice;
- WINDOW *dialog, *menu;
- do_resize:
- height = getmaxy(stdscr);
- width = getmaxx(stdscr);
- if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN)
- return -ERRDISPLAYTOOSMALL;
- height -= 4;
- width -= 5;
- menu_height = height - 10;
- max_choice = MIN(menu_height, item_count());
- /* center dialog box on screen */
- x = (getmaxx(stdscr) - width) / 2;
- y = (getmaxy(stdscr) - height) / 2;
- draw_shadow(stdscr, y, x, height, width);
- dialog = newwin(height, width, y, x);
- keypad(dialog, TRUE);
- draw_box(dialog, 0, 0, height, width,
- dlg.dialog.atr, dlg.border.atr);
- wattrset(dialog, dlg.border.atr);
- mvwaddch(dialog, height - 3, 0, ACS_LTEE);
- for (i = 0; i < width - 2; i++)
- waddch(dialog, ACS_HLINE);
- wattrset(dialog, dlg.dialog.atr);
- wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
- waddch(dialog, ACS_RTEE);
- print_title(dialog, title, width);
- wattrset(dialog, dlg.dialog.atr);
- print_autowrap(dialog, prompt, width - 2, 1, 3);
- menu_width = width - 6;
- box_y = height - menu_height - 5;
- box_x = (width - menu_width) / 2 - 1;
- /* create new window for the menu */
- menu = subwin(dialog, menu_height, menu_width,
- y + box_y + 1, x + box_x + 1);
- keypad(menu, TRUE);
- /* draw a box around the menu items */
- draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
- dlg.menubox_border.atr, dlg.menubox.atr);
- if (menu_width >= 80)
- item_x = (menu_width - 70) / 2;
- else
- item_x = 4;
- /* Set choice to default item */
- item_foreach()
- if (selected && (selected == item_data()))
- choice = item_n();
- /* get the saved scroll info */
- scroll = *s_scroll;
- if ((scroll <= choice) && (scroll + max_choice > choice) &&
- (scroll >= 0) && (scroll + max_choice <= item_count())) {
- first_item = scroll;
- choice = choice - scroll;
- } else {
- scroll = 0;
- }
- if ((choice >= max_choice)) {
- if (choice >= item_count() - max_choice / 2)
- scroll = first_item = item_count() - max_choice;
- else
- scroll = first_item = choice - max_choice / 2;
- choice = choice - scroll;
- }
- /* Print the menu */
- for (i = 0; i < max_choice; i++) {
- print_item(first_item + i, i, i == choice);
- }
- wnoutrefresh(menu);
- print_arrows(dialog, item_count(), scroll,
- box_y, box_x + item_x + 1, menu_height);
- print_buttons(dialog, height, width, 0);
- wmove(menu, choice, item_x + 1);
- wrefresh(menu);
- while (key != KEY_ESC) {
- key = wgetch(menu);
- if (key < 256 && isalpha(key))
- key = tolower(key);
- if (strchr("ynmh", key))
- i = max_choice;
- else {
- for (i = choice + 1; i < max_choice; i++) {
- item_set(scroll + i);
- j = first_alpha(item_str(), "YyNnMmHh");
- if (key == tolower(item_str()[j]))
- break;
- }
- if (i == max_choice)
- for (i = 0; i < max_choice; i++) {
- item_set(scroll + i);
- j = first_alpha(item_str(), "YyNnMmHh");
- if (key == tolower(item_str()[j]))
- break;
- }
- }
- if (item_count() != 0 &&
- (i < max_choice ||
- key == KEY_UP || key == KEY_DOWN ||
- key == '-' || key == '+' ||
- key == KEY_PPAGE || key == KEY_NPAGE)) {
- /* Remove highligt of current item */
- print_item(scroll + choice, choice, FALSE);
- if (key == KEY_UP || key == '-') {
- if (choice < 2 && scroll) {
- /* Scroll menu down */
- do_scroll(menu, &scroll, -1);
- print_item(scroll, 0, FALSE);
- } else
- choice = MAX(choice - 1, 0);
- } else if (key == KEY_DOWN || key == '+') {
- print_item(scroll+choice, choice, FALSE);
- if ((choice > max_choice - 3) &&
- (scroll + max_choice < item_count())) {
- /* Scroll menu up */
- do_scroll(menu, &scroll, 1);
- print_item(scroll+max_choice - 1,
- max_choice - 1, FALSE);
- } else
- choice = MIN(choice + 1, max_choice - 1);
- } else if (key == KEY_PPAGE) {
- scrollok(menu, TRUE);
- for (i = 0; (i < max_choice); i++) {
- if (scroll > 0) {
- do_scroll(menu, &scroll, -1);
- print_item(scroll, 0, FALSE);
- } else {
- if (choice > 0)
- choice--;
- }
- }
- } else if (key == KEY_NPAGE) {
- for (i = 0; (i < max_choice); i++) {
- if (scroll + max_choice < item_count()) {
- do_scroll(menu, &scroll, 1);
- print_item(scroll+max_choice-1,
- max_choice - 1, FALSE);
- } else {
- if (choice + 1 < max_choice)
- choice++;
- }
- }
- } else
- choice = i;
- print_item(scroll + choice, choice, TRUE);
- print_arrows(dialog, item_count(), scroll,
- box_y, box_x + item_x + 1, menu_height);
- wnoutrefresh(dialog);
- wrefresh(menu);
- continue; /* wait for another key press */
- }
- switch (key) {
- case KEY_LEFT:
- case TAB:
- case KEY_RIGHT:
- button = ((key == KEY_LEFT ? --button : ++button) < 0)
- ? 4 : (button > 4 ? 0 : button);
- print_buttons(dialog, height, width, button);
- wrefresh(menu);
- break;
- case ' ':
- case 's':
- case 'y':
- case 'n':
- case 'm':
- case '/':
- case 'h':
- case '?':
- case 'z':
- case '\n':
- /* save scroll info */
- *s_scroll = scroll;
- delwin(menu);
- delwin(dialog);
- item_set(scroll + choice);
- item_set_selected(1);
- switch (key) {
- case 'h':
- case '?':
- return 2;
- case 's':
- case 'y':
- return 5;
- case 'n':
- return 6;
- case 'm':
- return 7;
- case ' ':
- return 8;
- case '/':
- return 9;
- case 'z':
- return 10;
- case '\n':
- return button;
- }
- return 0;
- case 'e':
- case 'x':
- key = KEY_ESC;
- break;
- case KEY_ESC:
- key = on_key_esc(menu);
- break;
- case KEY_RESIZE:
- on_key_resize();
- delwin(menu);
- delwin(dialog);
- goto do_resize;
- }
- }
- delwin(menu);
- delwin(dialog);
- return key; /* ESC pressed */
- }
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