[3320] | 1 | /*
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| 2 | * menubox.c -- implements the menu box
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| 3 | *
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| 4 | * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
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| 5 | * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
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| 6 | *
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| 7 | * This program is free software; you can redistribute it and/or
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| 8 | * modify it under the terms of the GNU General Public License
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| 9 | * as published by the Free Software Foundation; either version 2
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| 10 | * of the License, or (at your option) any later version.
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| 11 | *
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| 12 | * This program is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 20 | */
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| 21 |
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| 22 | /*
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| 23 | * Changes by Clifford Wolf (god@clifford.at)
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| 24 | *
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| 25 | * [ 1998-06-13 ]
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| 26 | *
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| 27 | * *) A bugfix for the Page-Down problem
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| 28 | *
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| 29 | * *) Formerly when I used Page Down and Page Up, the cursor would be set
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| 30 | * to the first position in the menu box. Now lxdialog is a bit
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| 31 | * smarter and works more like other menu systems (just have a look at
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| 32 | * it).
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| 33 | *
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| 34 | * *) Formerly if I selected something my scrolling would be broken because
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| 35 | * lxdialog is re-invoked by the Menuconfig shell script, can't
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| 36 | * remember the last scrolling position, and just sets it so that the
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| 37 | * cursor is at the bottom of the box. Now it writes the temporary file
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| 38 | * lxdialog.scrltmp which contains this information. The file is
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| 39 | * deleted by lxdialog if the user leaves a submenu or enters a new
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| 40 | * one, but it would be nice if Menuconfig could make another "rm -f"
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| 41 | * just to be sure. Just try it out - you will recognise a difference!
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| 42 | *
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| 43 | * [ 1998-06-14 ]
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| 44 | *
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| 45 | * *) Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
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| 46 | * and menus change their size on the fly.
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| 47 | *
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| 48 | * *) If for some reason the last scrolling position is not saved by
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| 49 | * lxdialog, it sets the scrolling so that the selected item is in the
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| 50 | * middle of the menu box, not at the bottom.
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| 51 | *
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| 52 | * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
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| 53 | * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
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| 54 | * This fixes a bug in Menuconfig where using ' ' to descend into menus
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| 55 | * would leave mis-synchronized lxdialog.scrltmp files lying around,
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| 56 | * fscanf would read in 'scroll', and eventually that value would get used.
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| 57 | */
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| 58 |
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| 59 | #include "dialog.h"
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| 60 |
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| 61 | static int menu_width, item_x;
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| 62 |
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| 63 | /*
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| 64 | * Print menu item
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| 65 | */
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| 66 | static void do_print_item(WINDOW * win, const char *item, int choice,
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| 67 | int selected, int hotkey)
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| 68 | {
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| 69 | int j;
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| 70 | char *menu_item = malloc(menu_width + 1);
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| 71 |
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| 72 | strncpy(menu_item, item, menu_width - item_x);
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| 73 | menu_item[menu_width] = 0;
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| 74 | j = first_alpha(menu_item, "YyNnMmHh");
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| 75 |
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| 76 | /* Clear 'residue' of last item */
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| 77 | wattrset(win, menubox_attr);
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| 78 | wmove(win, choice, 0);
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| 79 | #if OLD_NCURSES
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| 80 | {
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| 81 | int i;
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| 82 | for (i = 0; i < menu_width; i++)
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| 83 | waddch(win, ' ');
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| 84 | }
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| 85 | #else
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| 86 | wclrtoeol(win);
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| 87 | #endif
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| 88 | wattrset(win, selected ? item_selected_attr : item_attr);
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| 89 | mvwaddstr(win, choice, item_x, menu_item);
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| 90 | if (hotkey) {
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| 91 | wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
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| 92 | mvwaddch(win, choice, item_x + j, menu_item[j]);
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| 93 | }
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| 94 | if (selected) {
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| 95 | wmove(win, choice, item_x + 1);
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| 96 | }
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| 97 | free(menu_item);
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| 98 | wrefresh(win);
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| 99 | }
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| 100 |
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| 101 | #define print_item(index, choice, selected) \
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| 102 | do {\
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| 103 | int hotkey = (items[(index) * 2][0] != ':'); \
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| 104 | do_print_item(menu, items[(index) * 2 + 1], choice, selected, hotkey); \
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| 105 | } while (0)
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| 106 |
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| 107 | /*
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| 108 | * Print the scroll indicators.
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| 109 | */
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| 110 | static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
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| 111 | int height)
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| 112 | {
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| 113 | int cur_y, cur_x;
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| 114 |
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| 115 | getyx(win, cur_y, cur_x);
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| 116 |
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| 117 | wmove(win, y, x);
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| 118 |
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| 119 | if (scroll > 0) {
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| 120 | wattrset(win, uarrow_attr);
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| 121 | waddch(win, ACS_UARROW);
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| 122 | waddstr(win, "(-)");
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| 123 | } else {
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| 124 | wattrset(win, menubox_attr);
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| 125 | waddch(win, ACS_HLINE);
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| 126 | waddch(win, ACS_HLINE);
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| 127 | waddch(win, ACS_HLINE);
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| 128 | waddch(win, ACS_HLINE);
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| 129 | }
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| 130 |
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| 131 | y = y + height + 1;
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| 132 | wmove(win, y, x);
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| 133 | wrefresh(win);
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| 134 |
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| 135 | if ((height < item_no) && (scroll + height < item_no)) {
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| 136 | wattrset(win, darrow_attr);
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| 137 | waddch(win, ACS_DARROW);
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| 138 | waddstr(win, "(+)");
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| 139 | } else {
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| 140 | wattrset(win, menubox_border_attr);
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| 141 | waddch(win, ACS_HLINE);
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| 142 | waddch(win, ACS_HLINE);
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| 143 | waddch(win, ACS_HLINE);
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| 144 | waddch(win, ACS_HLINE);
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| 145 | }
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| 146 |
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| 147 | wmove(win, cur_y, cur_x);
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| 148 | wrefresh(win);
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| 149 | }
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| 150 |
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| 151 | /*
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| 152 | * Display the termination buttons.
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| 153 | */
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| 154 | static void print_buttons(WINDOW * win, int height, int width, int selected)
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| 155 | {
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| 156 | int x = width / 2 - 16;
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| 157 | int y = height - 2;
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| 158 |
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| 159 | print_button(win, "Select", y, x, selected == 0);
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| 160 | print_button(win, " Exit ", y, x + 12, selected == 1);
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| 161 | print_button(win, " Help ", y, x + 24, selected == 2);
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| 162 |
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| 163 | wmove(win, y, x + 1 + 12 * selected);
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| 164 | wrefresh(win);
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| 165 | }
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| 166 |
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| 167 | /* scroll up n lines (n may be negative) */
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| 168 | static void do_scroll(WINDOW *win, int *scroll, int n)
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| 169 | {
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| 170 | /* Scroll menu up */
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| 171 | scrollok(win, TRUE);
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| 172 | wscrl(win, n);
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| 173 | scrollok(win, FALSE);
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| 174 | *scroll = *scroll + n;
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| 175 | wrefresh(win);
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| 176 | }
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| 177 |
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| 178 | /*
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| 179 | * Display a menu for choosing among a number of options
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| 180 | */
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| 181 | int dialog_menu(const char *title, const char *prompt, int height, int width,
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| 182 | int menu_height, const char *current, int item_no,
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| 183 | const char *const *items)
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| 184 | {
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| 185 | int i, j, x, y, box_x, box_y;
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| 186 | int key = 0, button = 0, scroll = 0, choice = 0;
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| 187 | int first_item = 0, max_choice;
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| 188 | WINDOW *dialog, *menu;
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| 189 | FILE *f;
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| 190 |
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| 191 | max_choice = MIN(menu_height, item_no);
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| 192 |
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| 193 | /* center dialog box on screen */
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| 194 | x = (COLS - width) / 2;
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| 195 | y = (LINES - height) / 2;
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| 196 |
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| 197 | draw_shadow(stdscr, y, x, height, width);
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| 198 |
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| 199 | dialog = newwin(height, width, y, x);
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| 200 | keypad(dialog, TRUE);
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| 201 |
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| 202 | draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
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| 203 | wattrset(dialog, border_attr);
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| 204 | mvwaddch(dialog, height - 3, 0, ACS_LTEE);
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| 205 | for (i = 0; i < width - 2; i++)
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| 206 | waddch(dialog, ACS_HLINE);
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| 207 | wattrset(dialog, dialog_attr);
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| 208 | wbkgdset(dialog, dialog_attr & A_COLOR);
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| 209 | waddch(dialog, ACS_RTEE);
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| 210 |
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| 211 | print_title(dialog, title, width);
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| 212 |
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| 213 | wattrset(dialog, dialog_attr);
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| 214 | print_autowrap(dialog, prompt, width - 2, 1, 3);
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| 215 |
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| 216 | menu_width = width - 6;
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| 217 | box_y = height - menu_height - 5;
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| 218 | box_x = (width - menu_width) / 2 - 1;
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| 219 |
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| 220 | /* create new window for the menu */
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| 221 | menu = subwin(dialog, menu_height, menu_width,
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| 222 | y + box_y + 1, x + box_x + 1);
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| 223 | keypad(menu, TRUE);
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| 224 |
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| 225 | /* draw a box around the menu items */
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| 226 | draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
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| 227 | menubox_border_attr, menubox_attr);
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| 228 |
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| 229 | item_x = (menu_width - 70) / 2;
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| 230 |
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| 231 | /* Set choice to default item */
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| 232 | for (i = 0; i < item_no; i++)
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| 233 | if (strcmp(current, items[i * 2]) == 0)
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| 234 | choice = i;
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| 235 |
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| 236 | /* get the scroll info from the temp file */
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| 237 | if ((f = fopen("lxdialog.scrltmp", "r")) != NULL) {
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| 238 | if ((fscanf(f, "%d\n", &scroll) == 1) && (scroll <= choice) &&
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| 239 | (scroll + max_choice > choice) && (scroll >= 0) &&
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| 240 | (scroll + max_choice <= item_no)) {
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| 241 | first_item = scroll;
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| 242 | choice = choice - scroll;
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| 243 | fclose(f);
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| 244 | } else {
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| 245 | scroll = 0;
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| 246 | remove("lxdialog.scrltmp");
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| 247 | fclose(f);
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| 248 | f = NULL;
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| 249 | }
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| 250 | }
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| 251 | if ((choice >= max_choice) || (f == NULL && choice >= max_choice / 2)) {
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| 252 | if (choice >= item_no - max_choice / 2)
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| 253 | scroll = first_item = item_no - max_choice;
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| 254 | else
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| 255 | scroll = first_item = choice - max_choice / 2;
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| 256 | choice = choice - scroll;
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| 257 | }
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| 258 |
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| 259 | /* Print the menu */
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| 260 | for (i = 0; i < max_choice; i++) {
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| 261 | print_item(first_item + i, i, i == choice);
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| 262 | }
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| 263 |
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| 264 | wnoutrefresh(menu);
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| 265 |
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| 266 | print_arrows(dialog, item_no, scroll,
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| 267 | box_y, box_x + item_x + 1, menu_height);
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| 268 |
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| 269 | print_buttons(dialog, height, width, 0);
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| 270 | wmove(menu, choice, item_x + 1);
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| 271 | wrefresh(menu);
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| 272 |
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| 273 | while (key != ESC) {
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| 274 | key = wgetch(menu);
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| 275 |
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| 276 | if (key < 256 && isalpha(key))
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| 277 | key = tolower(key);
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| 278 |
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| 279 | if (strchr("ynmh", key))
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| 280 | i = max_choice;
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| 281 | else {
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| 282 | for (i = choice + 1; i < max_choice; i++) {
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| 283 | j = first_alpha(items[(scroll + i) * 2 + 1], "YyNnMmHh");
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| 284 | if (key == tolower(items[(scroll + i) * 2 + 1][j]))
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| 285 | break;
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| 286 | }
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| 287 | if (i == max_choice)
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| 288 | for (i = 0; i < max_choice; i++) {
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| 289 | j = first_alpha(items [(scroll + i) * 2 + 1], "YyNnMmHh");
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| 290 | if (key == tolower(items[(scroll + i) * 2 + 1][j]))
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| 291 | break;
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| 292 | }
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| 293 | }
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| 294 |
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| 295 | if (i < max_choice ||
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| 296 | key == KEY_UP || key == KEY_DOWN ||
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| 297 | key == '-' || key == '+' ||
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| 298 | key == KEY_PPAGE || key == KEY_NPAGE) {
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| 299 | /* Remove highligt of current item */
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| 300 | print_item(scroll + choice, choice, FALSE);
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| 301 |
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| 302 | if (key == KEY_UP || key == '-') {
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| 303 | if (choice < 2 && scroll) {
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| 304 | /* Scroll menu down */
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| 305 | do_scroll(menu, &scroll, -1);
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| 306 |
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| 307 | print_item(scroll, 0, FALSE);
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| 308 | } else
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| 309 | choice = MAX(choice - 1, 0);
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| 310 |
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| 311 | } else if (key == KEY_DOWN || key == '+') {
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| 312 | print_item(scroll+choice, choice, FALSE);
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| 313 |
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| 314 | if ((choice > max_choice - 3) &&
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| 315 | (scroll + max_choice < item_no)) {
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| 316 | /* Scroll menu up */
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| 317 | do_scroll(menu, &scroll, 1);
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| 318 |
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| 319 | print_item(scroll+max_choice - 1,
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| 320 | max_choice - 1, FALSE);
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| 321 | } else
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| 322 | choice = MIN(choice + 1, max_choice - 1);
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| 323 |
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| 324 | } else if (key == KEY_PPAGE) {
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| 325 | scrollok(menu, TRUE);
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| 326 | for (i = 0; (i < max_choice); i++) {
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| 327 | if (scroll > 0) {
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| 328 | do_scroll(menu, &scroll, -1);
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| 329 | print_item(scroll, 0, FALSE);
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| 330 | } else {
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| 331 | if (choice > 0)
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| 332 | choice--;
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| 333 | }
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| 334 | }
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| 335 |
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| 336 | } else if (key == KEY_NPAGE) {
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| 337 | for (i = 0; (i < max_choice); i++) {
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| 338 | if (scroll + max_choice < item_no) {
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| 339 | do_scroll(menu, &scroll, 1);
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| 340 | print_item(scroll+max_choice-1,
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| 341 | max_choice - 1, FALSE);
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| 342 | } else {
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| 343 | if (choice + 1 < max_choice)
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| 344 | choice++;
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| 345 | }
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| 346 | }
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| 347 | } else
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| 348 | choice = i;
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| 349 |
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| 350 | print_item(scroll + choice, choice, TRUE);
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| 351 |
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| 352 | print_arrows(dialog, item_no, scroll,
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| 353 | box_y, box_x + item_x + 1, menu_height);
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| 354 |
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| 355 | wnoutrefresh(dialog);
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| 356 | wrefresh(menu);
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| 357 |
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| 358 | continue; /* wait for another key press */
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| 359 | }
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| 360 |
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| 361 | switch (key) {
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| 362 | case KEY_LEFT:
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| 363 | case TAB:
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| 364 | case KEY_RIGHT:
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| 365 | button = ((key == KEY_LEFT ? --button : ++button) < 0)
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| 366 | ? 2 : (button > 2 ? 0 : button);
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| 367 |
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| 368 | print_buttons(dialog, height, width, button);
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| 369 | wrefresh(menu);
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| 370 | break;
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| 371 | case ' ':
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| 372 | case 's':
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| 373 | case 'y':
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| 374 | case 'n':
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| 375 | case 'm':
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| 376 | case '/':
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| 377 | /* save scroll info */
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| 378 | if ((f = fopen("lxdialog.scrltmp", "w")) != NULL) {
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| 379 | fprintf(f, "%d\n", scroll);
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| 380 | fclose(f);
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| 381 | }
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| 382 | delwin(dialog);
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| 383 | fprintf(stderr, "%s\n", items[(scroll + choice) * 2]);
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| 384 | switch (key) {
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| 385 | case 's':
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| 386 | return 3;
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| 387 | case 'y':
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| 388 | return 3;
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| 389 | case 'n':
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| 390 | return 4;
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| 391 | case 'm':
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| 392 | return 5;
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| 393 | case ' ':
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| 394 | return 6;
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| 395 | case '/':
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| 396 | return 7;
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| 397 | }
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| 398 | return 0;
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| 399 | case 'h':
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| 400 | case '?':
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| 401 | button = 2;
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| 402 | case '\n':
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| 403 | delwin(dialog);
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| 404 | if (button == 2)
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| 405 | fprintf(stderr, "%s \"%s\"\n",
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| 406 | items[(scroll + choice) * 2],
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| 407 | items[(scroll + choice) * 2 + 1] +
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| 408 | first_alpha(items [(scroll + choice) * 2 + 1], ""));
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| 409 | else
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| 410 | fprintf(stderr, "%s\n",
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| 411 | items[(scroll + choice) * 2]);
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| 412 |
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| 413 | remove("lxdialog.scrltmp");
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| 414 | return button;
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| 415 | case 'e':
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| 416 | case 'x':
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| 417 | key = ESC;
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| 418 | case ESC:
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| 419 | break;
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| 420 | }
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| 421 | }
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| 422 |
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| 423 | delwin(dialog);
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| 424 | remove("lxdialog.scrltmp");
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| 425 | return -1; /* ESC pressed */
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| 426 | }
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