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// SPDX-License-Identifier: GPL-2.0+ /* * 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) */ /* * 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, "Select", y, x, selected == 0); print_button(win, " Exit ", y, x + 12, selected == 1); print_button(win, " Help ", y, x + 24, selected == 2); print_button(win, " Save ", y, x + 36, selected == 3); print_button(win, " 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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