425 lines
10 KiB
C
425 lines
10 KiB
C
// 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 (lam836@cs.cuhk.hk)
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* MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
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*/
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/*
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* Changes by Clifford Wolf (god@clifford.at)
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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 (mec@shout.net)
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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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