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424 lines
10 KiB
424 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* menubox.c -- implements the menu box |
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* |
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* ORIGINAL AUTHOR: Savio Lam ([email protected]) |
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* MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap ([email protected]) |
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*/ |
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/* |
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* Changes by Clifford Wolf ([email protected]) |
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* |
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* [ 1998-06-13 ] |
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* |
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* *) A bugfix for the Page-Down problem |
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* |
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* *) Formerly when I used Page Down and Page Up, the cursor would be set |
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* to the first position in the menu box. Now lxdialog is a bit |
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* smarter and works more like other menu systems (just have a look at |
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* it). |
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* |
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* *) Formerly if I selected something my scrolling would be broken because |
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* lxdialog is re-invoked by the Menuconfig shell script, can't |
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* remember the last scrolling position, and just sets it so that the |
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* cursor is at the bottom of the box. Now it writes the temporary file |
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* lxdialog.scrltmp which contains this information. The file is |
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* deleted by lxdialog if the user leaves a submenu or enters a new |
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* one, but it would be nice if Menuconfig could make another "rm -f" |
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* just to be sure. Just try it out - you will recognise a difference! |
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* |
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* [ 1998-06-14 ] |
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* |
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* *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files |
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* and menus change their size on the fly. |
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* |
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* *) If for some reason the last scrolling position is not saved by |
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* lxdialog, it sets the scrolling so that the selected item is in the |
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* middle of the menu box, not at the bottom. |
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* |
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* 02 January 1999, Michael Elizabeth Chastain ([email protected]) |
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* Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus. |
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* This fixes a bug in Menuconfig where using ' ' to descend into menus |
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* would leave mis-synchronized lxdialog.scrltmp files lying around, |
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* fscanf would read in 'scroll', and eventually that value would get used. |
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*/ |
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#include "dialog.h" |
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static int menu_width, item_x; |
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/* |
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* Print menu item |
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*/ |
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static void do_print_item(WINDOW * win, const char *item, int line_y, |
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int selected, int hotkey) |
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{ |
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int j; |
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char *menu_item = malloc(menu_width + 1); |
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strncpy(menu_item, item, menu_width - item_x); |
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menu_item[menu_width - item_x] = '\0'; |
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j = first_alpha(menu_item, "YyNnMmHh"); |
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/* Clear 'residue' of last item */ |
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wattrset(win, dlg.menubox.atr); |
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wmove(win, line_y, 0); |
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#if OLD_NCURSES |
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{ |
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int i; |
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for (i = 0; i < menu_width; i++) |
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waddch(win, ' '); |
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} |
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#else |
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wclrtoeol(win); |
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#endif |
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wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr); |
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mvwaddstr(win, line_y, item_x, menu_item); |
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if (hotkey) { |
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wattrset(win, selected ? dlg.tag_key_selected.atr |
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: dlg.tag_key.atr); |
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mvwaddch(win, line_y, item_x + j, menu_item[j]); |
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} |
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if (selected) { |
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wmove(win, line_y, item_x + 1); |
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} |
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free(menu_item); |
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wrefresh(win); |
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} |
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#define print_item(index, choice, selected) \ |
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do { \ |
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item_set(index); \ |
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do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \ |
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} while (0) |
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/* |
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* Print the scroll indicators. |
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*/ |
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static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x, |
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int height) |
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{ |
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int cur_y, cur_x; |
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getyx(win, cur_y, cur_x); |
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wmove(win, y, x); |
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if (scroll > 0) { |
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wattrset(win, dlg.uarrow.atr); |
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waddch(win, ACS_UARROW); |
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waddstr(win, "(-)"); |
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} else { |
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wattrset(win, dlg.menubox.atr); |
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waddch(win, ACS_HLINE); |
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waddch(win, ACS_HLINE); |
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waddch(win, ACS_HLINE); |
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waddch(win, ACS_HLINE); |
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} |
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y = y + height + 1; |
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wmove(win, y, x); |
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wrefresh(win); |
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if ((height < item_no) && (scroll + height < item_no)) { |
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wattrset(win, dlg.darrow.atr); |
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waddch(win, ACS_DARROW); |
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waddstr(win, "(+)"); |
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} else { |
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wattrset(win, dlg.menubox_border.atr); |
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waddch(win, ACS_HLINE); |
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waddch(win, ACS_HLINE); |
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waddch(win, ACS_HLINE); |
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waddch(win, ACS_HLINE); |
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} |
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wmove(win, cur_y, cur_x); |
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wrefresh(win); |
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} |
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/* |
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* Display the termination buttons. |
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*/ |
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static void print_buttons(WINDOW * win, int height, int width, int selected) |
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{ |
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int x = width / 2 - 28; |
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int y = height - 2; |
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print_button(win, "Select", y, x, selected == 0); |
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print_button(win, " Exit ", y, x + 12, selected == 1); |
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print_button(win, " Help ", y, x + 24, selected == 2); |
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print_button(win, " Save ", y, x + 36, selected == 3); |
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print_button(win, " Load ", y, x + 48, selected == 4); |
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wmove(win, y, x + 1 + 12 * selected); |
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wrefresh(win); |
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} |
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/* scroll up n lines (n may be negative) */ |
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static void do_scroll(WINDOW *win, int *scroll, int n) |
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{ |
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/* Scroll menu up */ |
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scrollok(win, TRUE); |
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wscrl(win, n); |
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scrollok(win, FALSE); |
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*scroll = *scroll + n; |
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wrefresh(win); |
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} |
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/* |
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* Display a menu for choosing among a number of options |
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*/ |
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int dialog_menu(const char *title, const char *prompt, |
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const void *selected, int *s_scroll) |
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{ |
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int i, j, x, y, box_x, box_y; |
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int height, width, menu_height; |
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int key = 0, button = 0, scroll = 0, choice = 0; |
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int first_item = 0, max_choice; |
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WINDOW *dialog, *menu; |
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do_resize: |
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height = getmaxy(stdscr); |
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width = getmaxx(stdscr); |
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if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN) |
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return -ERRDISPLAYTOOSMALL; |
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height -= 4; |
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width -= 5; |
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menu_height = height - 10; |
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max_choice = MIN(menu_height, item_count()); |
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/* center dialog box on screen */ |
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x = (getmaxx(stdscr) - width) / 2; |
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y = (getmaxy(stdscr) - height) / 2; |
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draw_shadow(stdscr, y, x, height, width); |
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dialog = newwin(height, width, y, x); |
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keypad(dialog, TRUE); |
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draw_box(dialog, 0, 0, height, width, |
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dlg.dialog.atr, dlg.border.atr); |
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wattrset(dialog, dlg.border.atr); |
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mvwaddch(dialog, height - 3, 0, ACS_LTEE); |
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for (i = 0; i < width - 2; i++) |
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waddch(dialog, ACS_HLINE); |
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wattrset(dialog, dlg.dialog.atr); |
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wbkgdset(dialog, dlg.dialog.atr & A_COLOR); |
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waddch(dialog, ACS_RTEE); |
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print_title(dialog, title, width); |
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wattrset(dialog, dlg.dialog.atr); |
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print_autowrap(dialog, prompt, width - 2, 1, 3); |
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menu_width = width - 6; |
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box_y = height - menu_height - 5; |
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box_x = (width - menu_width) / 2 - 1; |
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/* create new window for the menu */ |
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menu = subwin(dialog, menu_height, menu_width, |
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y + box_y + 1, x + box_x + 1); |
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keypad(menu, TRUE); |
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/* draw a box around the menu items */ |
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draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2, |
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dlg.menubox_border.atr, dlg.menubox.atr); |
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if (menu_width >= 80) |
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item_x = (menu_width - 70) / 2; |
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else |
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item_x = 4; |
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/* Set choice to default item */ |
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item_foreach() |
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if (selected && (selected == item_data())) |
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choice = item_n(); |
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/* get the saved scroll info */ |
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scroll = *s_scroll; |
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if ((scroll <= choice) && (scroll + max_choice > choice) && |
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(scroll >= 0) && (scroll + max_choice <= item_count())) { |
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first_item = scroll; |
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choice = choice - scroll; |
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} else { |
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scroll = 0; |
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} |
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if ((choice >= max_choice)) { |
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if (choice >= item_count() - max_choice / 2) |
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scroll = first_item = item_count() - max_choice; |
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else |
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scroll = first_item = choice - max_choice / 2; |
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choice = choice - scroll; |
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} |
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/* Print the menu */ |
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for (i = 0; i < max_choice; i++) { |
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print_item(first_item + i, i, i == choice); |
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} |
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wnoutrefresh(menu); |
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print_arrows(dialog, item_count(), scroll, |
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box_y, box_x + item_x + 1, menu_height); |
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print_buttons(dialog, height, width, 0); |
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wmove(menu, choice, item_x + 1); |
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wrefresh(menu); |
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while (key != KEY_ESC) { |
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key = wgetch(menu); |
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if (key < 256 && isalpha(key)) |
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key = tolower(key); |
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if (strchr("ynmh", key)) |
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i = max_choice; |
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else { |
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for (i = choice + 1; i < max_choice; i++) { |
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item_set(scroll + i); |
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j = first_alpha(item_str(), "YyNnMmHh"); |
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if (key == tolower(item_str()[j])) |
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break; |
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} |
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if (i == max_choice) |
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for (i = 0; i < max_choice; i++) { |
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item_set(scroll + i); |
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j = first_alpha(item_str(), "YyNnMmHh"); |
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if (key == tolower(item_str()[j])) |
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break; |
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} |
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} |
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if (item_count() != 0 && |
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(i < max_choice || |
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key == KEY_UP || key == KEY_DOWN || |
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key == '-' || key == '+' || |
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key == KEY_PPAGE || key == KEY_NPAGE)) { |
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/* Remove highligt of current item */ |
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print_item(scroll + choice, choice, FALSE); |
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if (key == KEY_UP || key == '-') { |
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if (choice < 2 && scroll) { |
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/* Scroll menu down */ |
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do_scroll(menu, &scroll, -1); |
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print_item(scroll, 0, FALSE); |
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} else |
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choice = MAX(choice - 1, 0); |
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} else if (key == KEY_DOWN || key == '+') { |
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print_item(scroll+choice, choice, FALSE); |
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if ((choice > max_choice - 3) && |
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(scroll + max_choice < item_count())) { |
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/* Scroll menu up */ |
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do_scroll(menu, &scroll, 1); |
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print_item(scroll+max_choice - 1, |
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max_choice - 1, FALSE); |
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} else |
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choice = MIN(choice + 1, max_choice - 1); |
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} else if (key == KEY_PPAGE) { |
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scrollok(menu, TRUE); |
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for (i = 0; (i < max_choice); i++) { |
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if (scroll > 0) { |
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do_scroll(menu, &scroll, -1); |
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print_item(scroll, 0, FALSE); |
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} else { |
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if (choice > 0) |
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choice--; |
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} |
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} |
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} else if (key == KEY_NPAGE) { |
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for (i = 0; (i < max_choice); i++) { |
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if (scroll + max_choice < item_count()) { |
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do_scroll(menu, &scroll, 1); |
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print_item(scroll+max_choice-1, |
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max_choice - 1, FALSE); |
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} else { |
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if (choice + 1 < max_choice) |
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choice++; |
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} |
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} |
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} else |
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choice = i; |
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print_item(scroll + choice, choice, TRUE); |
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print_arrows(dialog, item_count(), scroll, |
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box_y, box_x + item_x + 1, menu_height); |
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wnoutrefresh(dialog); |
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wrefresh(menu); |
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continue; /* wait for another key press */ |
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} |
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switch (key) { |
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case KEY_LEFT: |
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case TAB: |
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case KEY_RIGHT: |
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button = ((key == KEY_LEFT ? --button : ++button) < 0) |
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? 4 : (button > 4 ? 0 : button); |
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print_buttons(dialog, height, width, button); |
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wrefresh(menu); |
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break; |
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case ' ': |
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case 's': |
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case 'y': |
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case 'n': |
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case 'm': |
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case '/': |
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case 'h': |
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case '?': |
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case 'z': |
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case '\n': |
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/* save scroll info */ |
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*s_scroll = scroll; |
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delwin(menu); |
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delwin(dialog); |
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item_set(scroll + choice); |
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item_set_selected(1); |
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switch (key) { |
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case 'h': |
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case '?': |
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return 2; |
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case 's': |
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case 'y': |
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return 5; |
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case 'n': |
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return 6; |
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case 'm': |
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return 7; |
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case ' ': |
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return 8; |
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case '/': |
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return 9; |
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case 'z': |
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return 10; |
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case '\n': |
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return button; |
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} |
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return 0; |
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case 'e': |
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case 'x': |
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key = KEY_ESC; |
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break; |
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case KEY_ESC: |
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key = on_key_esc(menu); |
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break; |
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case KEY_RESIZE: |
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on_key_resize(); |
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delwin(menu); |
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delwin(dialog); |
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goto do_resize; |
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} |
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} |
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delwin(menu); |
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delwin(dialog); |
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return key; /* ESC pressed */ |
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}
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