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freebsd/gnu/lib/libdialog/menubox.c

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/*
* menubox.c -- implements the menu box
*
* AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "dialog.priv.h"
#include <dialog.h>
static void print_item(WINDOW *win, unsigned char *tag, unsigned char *item, int choice, int selected);
static int menu_width, tag_x, item_x;
/*
* Display a menu for choosing among a number of options
*/
int dialog_menu(unsigned char *title, unsigned char *prompt, int height, int width, int menu_height, int item_no, unsigned char **items, unsigned char *result)
{
int i, x, y, cur_x, cur_y, box_x, box_y, key = 0, button = 0, choice = 0,
scroll = 0, max_choice;
WINDOW *dialog, *menu;
max_choice = MIN(menu_height, item_no);
/* center dialog box on screen */
x = (COLS - width)/2;
y = (LINES - height)/2;
#ifdef HAVE_NCURSES
if (use_shadow)
draw_shadow(stdscr, y, x, height, width);
#endif
dialog = newwin(height, width, y, x);
keypad(dialog, TRUE);
draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
wattrset(dialog, border_attr);
wmove(dialog, height-3, 0);
waddch(dialog, ACS_LTEE);
for (i = 0; i < width-2; i++)
waddch(dialog, ACS_HLINE);
wattrset(dialog, dialog_attr);
waddch(dialog, ACS_RTEE);
wmove(dialog, height-2, 1);
for (i = 0; i < width-2; i++)
waddch(dialog, ' ');
if (title != NULL) {
wattrset(dialog, title_attr);
wmove(dialog, 0, (width - strlen(title))/2 - 1);
waddch(dialog, ' ');
waddstr(dialog, title);
waddch(dialog, ' ');
}
wattrset(dialog, dialog_attr);
print_autowrap(dialog, prompt, width, 1, 3);
menu_width = width-6;
getyx(dialog, cur_y, cur_x);
box_y = cur_y + 1;
box_x = (width - menu_width)/2 - 1;
/* create new window for the menu */
menu = subwin(dialog, menu_height, menu_width, y + box_y + 1, x + box_x + 1);
keypad(menu, TRUE);
/* draw a box around the menu items */
draw_box(dialog, box_y, box_x, menu_height+2, menu_width+2, menubox_border_attr, menubox_attr);
tag_x = 0;
item_x = 0;
/* Find length of longest item in order to center menu */
for (i = 0; i < item_no; i++) {
tag_x = MAX(tag_x, strlen(items[i*2]) + strlen(items[i*2 + 1]) + 2);
item_x = MAX(item_x, strlen(items[i*2]));
}
tag_x = (menu_width - tag_x) / 2;
item_x = tag_x + item_x + 2;
/* Print the menu */
for (i = 0; i < max_choice; i++)
print_item(menu, items[i*2], items[i*2 + 1], i, i == choice);
wnoutrefresh(menu);
if (menu_height < item_no) {
wattrset(dialog, darrow_attr);
wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 1);
waddch(dialog, ACS_DARROW);
wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 2);
waddstr(dialog,"(+)");
}
x = width/2-11;
y = height-2;
print_button(dialog, "Cancel", y, x+14, FALSE);
print_button(dialog, " OK ", y, x, TRUE);
wrefresh(dialog);
while (key != ESC) {
key = wgetch(dialog);
/* Check if key pressed matches first character of any item tag in menu */
for (i = 0; i < max_choice; i++)
if (key < 0x100 && toupper(key) == toupper(items[(scroll+i)*2][0]))
break;
if (i < max_choice || (key >= '1' && key <= MIN('9', '0'+max_choice)) ||
key == KEY_UP || key == KEY_DOWN || key == '-' || key == '+') {
if (key >= '1' && key <= MIN('9', '0'+max_choice))
i = key - '1';
else if (key == KEY_UP || key == '-') {
if (!choice) {
if (scroll) {
#ifdef BROKEN_WSCRL
/* wscrl() in ncurses 1.8.1 seems to be broken, causing a segmentation
violation when scrolling windows of height = 4, so scrolling is not
used for now */
scroll--;
getyx(dialog, cur_y, cur_x); /* Save cursor position */
/* Reprint menu to scroll down */
for (i = 0; i < max_choice; i++)
print_item(menu, items[(scroll+i)*2], items[(scroll+i)*2 + 1], i, i == choice);
#else
/* Scroll menu down */
getyx(dialog, cur_y, cur_x); /* Save cursor position */
if (menu_height > 1) {
/* De-highlight current first item before scrolling down */
print_item(menu, items[scroll*2], items[scroll*2 + 1], 0, FALSE);
scrollok(menu, TRUE);
wscrl(menu, -1);
scrollok(menu, FALSE);
}
scroll--;
print_item(menu, items[scroll*2], items[scroll*2 + 1], 0, TRUE);
#endif
wnoutrefresh(menu);
/* print the up/down arrows */
wmove(dialog, box_y, box_x + tag_x + 1);
wattrset(dialog, scroll ? uarrow_attr : menubox_attr);
waddch(dialog, scroll ? ACS_UARROW : ACS_HLINE);
wmove(dialog, box_y, box_x + tag_x + 2);
waddch(dialog, scroll ? '(' : ACS_HLINE);
wmove(dialog, box_y, box_x + tag_x + 3);
waddch(dialog, scroll ? '-' : ACS_HLINE);
wmove(dialog, box_y, box_x + tag_x + 4);
waddch(dialog, scroll ? ')' : ACS_HLINE);
wattrset(dialog, darrow_attr);
wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 1);
waddch(dialog, ACS_DARROW);
wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 2);
waddstr(dialog,"(+)");
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
wrefresh(dialog);
}
continue; /* wait for another key press */
}
else
i = choice - 1;
}
else if (key == KEY_DOWN || key == '+')
if (choice == max_choice - 1) {
if (scroll+choice < item_no-1) {
#ifdef BROKEN_WSCRL
/* wscrl() in ncurses 1.8.1 seems to be broken, causing a segmentation
violation when scrolling windows of height = 4, so scrolling is not
used for now */
scroll++;
getyx(dialog, cur_y, cur_x); /* Save cursor position */
/* Reprint menu to scroll up */
for (i = 0; i < max_choice; i++)
print_item(menu, items[(scroll+i)*2], items[(scroll+i)*2 + 1], i, i == choice);
#else
/* Scroll menu up */
getyx(dialog, cur_y, cur_x); /* Save cursor position */
if (menu_height > 1) {
/* De-highlight current last item before scrolling up */
print_item(menu, items[(scroll+max_choice-1)*2], items[(scroll+max_choice-1)*2 + 1], max_choice-1, FALSE);
scrollok(menu, TRUE);
scroll(menu);
scrollok(menu, FALSE);
}
scroll++;
print_item(menu, items[(scroll+max_choice-1)*2], items[(scroll+max_choice-1)*2 + 1], max_choice-1, TRUE);
#endif
wnoutrefresh(menu);
/* print the up/down arrows */
wattrset(dialog, uarrow_attr);
wmove(dialog, box_y, box_x + tag_x + 1);
waddch(dialog, ACS_UARROW);
wmove(dialog, box_y, box_x + tag_x + 2);
waddstr(dialog,"(-)");
wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 1);
wattrset(dialog, scroll+choice < item_no-1 ? darrow_attr : menubox_border_attr);
waddch(dialog, scroll+choice < item_no-1 ? ACS_DARROW : ACS_HLINE);
wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 2);
waddch(dialog, scroll+choice < item_no-1 ? '(' : ACS_HLINE);
wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 3);
waddch(dialog, scroll+choice < item_no-1 ? '+' : ACS_HLINE);
wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 4);
waddch(dialog, scroll+choice < item_no-1 ? ')' : ACS_HLINE);
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
wrefresh(dialog);
}
continue; /* wait for another key press */
}
else
i = choice + 1;
if (i != choice) {
/* De-highlight current item */
getyx(dialog, cur_y, cur_x); /* Save cursor position */
print_item(menu, items[(scroll+choice)*2], items[(scroll+choice)*2 + 1], choice, FALSE);
/* Highlight new item */
choice = i;
print_item(menu, items[(scroll+choice)*2], items[(scroll+choice)*2 + 1], choice, TRUE);
wnoutrefresh(menu);
wmove(dialog, cur_y, cur_x); /* Restore cursor to previous position */
wrefresh(dialog);
}
continue; /* wait for another key press */
}
switch (key) {
case 'O':
case 'o':
delwin(dialog);
strcpy(result, items[(scroll+choice)*2]);
return 0;
case 'C':
case 'c':
delwin(dialog);
return 1;
case KEY_BTAB:
case TAB:
case KEY_LEFT:
case KEY_RIGHT:
if (!button) {
button = 1; /* Indicates "Cancel" button is selected */
print_button(dialog, " OK ", y, x, FALSE);
print_button(dialog, "Cancel", y, x+14, TRUE);
}
else {
button = 0; /* Indicates "OK" button is selected */
print_button(dialog, "Cancel", y, x+14, FALSE);
print_button(dialog, " OK ", y, x, TRUE);
}
wrefresh(dialog);
break;
case ' ':
case '\n':
delwin(dialog);
if (!button)
strcpy(result, items[(scroll+choice)*2]);
return button;
case ESC:
break;
}
}
delwin(dialog);
return -1; /* ESC pressed */
}
/* End of dialog_menu() */
/*
* Print menu item
*/
static void print_item(WINDOW *win, unsigned char *tag, unsigned char *item, int choice, int selected)
{
int i;
/* Clear 'residue' of last item */
wattrset(win, menubox_attr);
wmove(win, choice, 0);
for (i = 0; i < menu_width; i++)
waddch(win, ' ');
wmove(win, choice, tag_x);
wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
waddch(win, tag[0]);
wattrset(win, selected ? tag_selected_attr : tag_attr);
waddstr(win, tag + 1);
wmove(win, choice, item_x);
wattrset(win, selected ? item_selected_attr : item_attr);
waddstr(win, item);
}
/* End of print_item() */
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