--- /dev/null
+/*
+ * 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 choice,
+ 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] = 0;
+ j = first_alpha(menu_item, "YyNnMmHh");
+
+ /* Clear 'residue' of last item */
+ wattrset(win, menubox_attr);
+ wmove(win, choice, 0);
+#if OLD_NCURSES
+ {
+ int i;
+ for (i = 0; i < menu_width; i++)
+ waddch(win, ' ');
+ }
+#else
+ wclrtoeol(win);
+#endif
+ wattrset(win, selected ? item_selected_attr : item_attr);
+ mvwaddstr(win, choice, item_x, menu_item);
+ if (hotkey) {
+ wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
+ mvwaddch(win, choice, item_x + j, menu_item[j]);
+ }
+ if (selected) {
+ wmove(win, choice, item_x + 1);
+ }
+ free(menu_item);
+ wrefresh(win);
+}
+
+#define print_item(index, choice, selected) \
+do {\
+ int hotkey = (items[(index) * 2][0] != ':'); \
+ do_print_item(menu, items[(index) * 2 + 1], choice, selected, hotkey); \
+} 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, uarrow_attr);
+ waddch(win, ACS_UARROW);
+ waddstr(win, "(-)");
+ } else {
+ wattrset(win, menubox_attr);
+ 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, darrow_attr);
+ waddch(win, ACS_DARROW);
+ waddstr(win, "(+)");
+ } else {
+ wattrset(win, menubox_border_attr);
+ 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 - 16;
+ int y = height - 2;
+
+ print_button(win, "Select", y, x, selected == 0);
+ print_button(win, " Exit ", y, x + 12, selected == 1);
+ print_button(win, " Help ", y, x + 24, selected == 2);
+
+ 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, int height, int width,
+ int menu_height, const char *current, int item_no,
+ const char *const *items)
+{
+ int i, j, x, y, box_x, box_y;
+ int key = 0, button = 0, scroll = 0, choice = 0;
+ int first_item = 0, max_choice;
+ WINDOW *dialog, *menu;
+ FILE *f;
+
+ max_choice = MIN(menu_height, item_no);
+
+ /* center dialog box on screen */
+ x = (COLS - width) / 2;
+ y = (LINES - 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, dialog_attr, border_attr);
+ wattrset(dialog, border_attr);
+ mvwaddch(dialog, height - 3, 0, ACS_LTEE);
+ for (i = 0; i < width - 2; i++)
+ waddch(dialog, ACS_HLINE);
+ wattrset(dialog, dialog_attr);
+ wbkgdset(dialog, dialog_attr & A_COLOR);
+ waddch(dialog, ACS_RTEE);
+
+ print_title(dialog, title, width);
+
+ wattrset(dialog, dialog_attr);
+ 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,
+ menubox_border_attr, menubox_attr);
+
+ item_x = (menu_width - 70) / 2;
+
+ /* Set choice to default item */
+ for (i = 0; i < item_no; i++)
+ if (strcmp(current, items[i * 2]) == 0)
+ choice = i;
+
+ /* get the scroll info from the temp file */
+ if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) {
+ if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) &&
+ (scroll + max_choice > choice) && (scroll >= 0) &&
+ (scroll + max_choice <= item_no)) {
+ first_item = scroll;
+ choice = choice - scroll;
+ fclose(f);
+ } else {
+ scroll = 0;
+ remove("lxdialog.scrltmp");
+ fclose(f);
+ f = NULL;
+ }
+ }
+ if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) {
+ if (choice >= item_no - max_choice / 2)
+ scroll = first_item = item_no - 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_no, 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 != 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++) {
+ j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh");
+ if (key == tolower(items[(scroll + i) * 2 + 1][j]))
+ break;
+ }
+ if (i == max_choice)
+ for (i = 0; i < max_choice; i++) {
+ j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh");
+ if (key == tolower(items[(scroll + i) * 2 + 1][j]))
+ break;
+ }
+ }
+
+ if (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_no)) {
+ /* 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_no) {
+ 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_no, 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)
+ ? 2 : (button > 2 ? 0 : button);
+
+ print_buttons(dialog, height, width, button);
+ wrefresh(menu);
+ break;
+ case ' ':
+ case 's':
+ case 'y':
+ case 'n':
+ case 'm':
+ case '/':
+ /* save scroll info */
+ if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) {
+ fprintf(f, "%d\n", scroll);
+ fclose(f);
+ }
+ delwin(dialog);
+ fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
+ switch (key) {
+ case 's':
+ return 3;
+ case 'y':
+ return 3;
+ case 'n':
+ return 4;
+ case 'm':
+ return 5;
+ case ' ':
+ return 6;
+ case '/':
+ return 7;
+ }
+ return 0;
+ case 'h':
+ case '?':
+ button = 2;
+ case '\n':
+ delwin(dialog);
+ if (button == 2)
+ fprintf(stderr, "%s \"%s\"\n",
+ items[(scroll + choice) * 2],
+ items[(scroll + choice) * 2 + 1] +
+ first_alpha(items [(scroll + choice) * 2 + 1], ""));
+ else
+ fprintf(stderr, "%s\n",
+ items[(scroll + choice) * 2]);
+
+ remove("lxdialog.scrltmp");
+ return button;
+ case 'e':
+ case 'x':
+ key = ESC;
+ case ESC:
+ break;
+ }
+ }
+
+ delwin(dialog);
+ remove("lxdialog.scrltmp");
+ return -1; /* ESC pressed */
+}
