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freebsd/gnu/lib/libdialog/menubox.c
Jordan K. Hubbard d1b7206119 Fix improperly re-entrant code which caused the menu spammage we've 
been seeing since 2.2.1.
Pointed-in-the-right-direction by:	phk
1997-10-12 12:09:46 +00:00

459 lines
14 KiB
C
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/*
* menubox.c -- implements the menu box
*
* AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
*
* Substantial rennovation: 12/18/95, Jordan K. Hubbard
*
* 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.h>
#include "dialog.priv.h"
#include <ncurses.h>
static void print_item(WINDOW *win, unsigned char *tag, unsigned char *item, int choice, int selected, dialogMenuItem *me, int menu_width, int tag_x, int item_x);
#define DREF(di, item) ((di) ? &((di)[(item)]) : NULL)
/*
* 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 cnt, void *it, unsigned char *result, int *ch, int *sc)
{
int i, j, x, y, cur_x, cur_y, box_x, box_y, key = 0, button, choice,
l, k, scroll, max_choice, item_no, redraw_menu = FALSE;
char okButton, cancelButton;
int rval = 0;
WINDOW *dialog, *menu;
unsigned char **items = NULL;
dialogMenuItem *ditems;
int menu_width, tag_x, item_x;
draw:
choice = ch ? *ch : 0;
scroll = sc ? *sc : 0;
button = 0;
/* If item_no is a positive integer, use old item specification format */
if (cnt >= 0) {
items = it;
ditems = NULL;
item_no = cnt;
}
/* It's the new specification format - fake the rest of the code out */
else {
item_no = abs(cnt);
ditems = it;
if (!items)
items = (unsigned char **)alloca((item_no * 2) * sizeof(unsigned char *));
/* Initializes status */
for (i = 0; i < item_no; i++) {
items[i*2] = ditems[i].prompt;
items[i*2 + 1] = ditems[i].title;
}
}
max_choice = MIN(menu_height, item_no);
tag_x = 0;
item_x = 0;
/* Find length of longest item in order to center menu */
for (i = 0; i < item_no; i++) {
l = strlen(items[i * 2]);
for (j = 0; j < item_no; j++) {
k = strlen(items[j * 2 + 1]);
tag_x = MAX(tag_x, l + k + 2);
}
item_x = MAX(item_x, l);
}
if (height < 0)
height = strheight(prompt) + menu_height + 4 + 2;
if (width < 0) {
i = strwidth(prompt);
j = ((title != NULL) ? strwidth(title) : 0);
width = MAX(i, j);
width = MAX(width, tag_x + 4) + 4;
}
width = MAX(width, 24);
if (width > COLS)
width = COLS;
if (height > LINES)
height = LINES;
/* center dialog box on screen */
x = DialogX ? DialogX : (COLS - width) / 2;
y = DialogY ? DialogY : (LINES - height) / 2;
#ifdef HAVE_NCURSES
if (use_shadow)
draw_shadow(stdscr, y, x, height, width);
#endif
dialog = newwin(height, width, y, x);
if (dialog == NULL) {
endwin();
fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height, width, y, x);
return -1;
}
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);
wmove(dialog, 1, 2);
print_autowrap(dialog, prompt, height - 1, width - 2, width, 1, 2, TRUE, FALSE);
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);
if (menu == NULL) {
delwin(dialog);
endwin();
fprintf(stderr, "\nsubwin(dialog,%d,%d,%d,%d) failed, maybe wrong dims\n", menu_height, menu_width,
y + box_y + 1, x + box_x + 1);
return -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 = menu_width > tag_x + 1 ? (menu_width - tag_x) / 2 : 1;
item_x = menu_width > item_x + 4 ? tag_x + item_x + 2 : menu_width - 3;
/* Print the menu */
for (i = 0; i < max_choice; i++)
print_item(menu, items[(scroll + i) * 2], items[(scroll + i) * 2 + 1], i, i == choice, DREF(ditems, scroll + i), menu_width, tag_x, item_x);
wnoutrefresh(menu);
print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
display_helpline(dialog, height - 1, width);
x = width / 2 - 11;
y = height - 2;
if (ditems && result) {
cancelButton = toupper(ditems[CANCEL_BUTTON].prompt[0]);
print_button(dialog, ditems[CANCEL_BUTTON].prompt, y, x + strlen(ditems[OK_BUTTON].prompt) + 5,
ditems[CANCEL_BUTTON].checked ? ditems[CANCEL_BUTTON].checked(&ditems[CANCEL_BUTTON]) : FALSE);
okButton = toupper(ditems[OK_BUTTON].prompt[0]);
print_button(dialog, ditems[OK_BUTTON].prompt, y, x,
ditems[OK_BUTTON].checked ? ditems[OK_BUTTON].checked(&ditems[OK_BUTTON]) : TRUE);
}
else {
cancelButton = 'C';
print_button(dialog, "Cancel", y, x + 14, FALSE);
okButton = 'O';
print_button(dialog, " OK ", y, x, TRUE);
}
wrefresh(dialog);
while (key != ESC) {
key = wgetch(dialog);
/* Shortcut to OK? */
if (toupper(key) == okButton) {
if (ditems) {
if (result && ditems[OK_BUTTON].fire) {
int status;
WINDOW *save;
save = dupwin(newscr);
status = ditems[OK_BUTTON].fire(&ditems[OK_BUTTON]);
if (status & DITEM_RESTORE) {
touchwin(save);
wrefresh(save);
}
delwin(save);
}
}
else if (result)
strcpy(result, items[(scroll + choice) * 2]);
rval = 0;
key = ESC; /* Punt! */
break;
}
/* Shortcut to cancel? */
if (toupper(key) == cancelButton) {
if (ditems && result && ditems[CANCEL_BUTTON].fire) {
int status;
WINDOW *save;
save = dupwin(newscr);
status = ditems[CANCEL_BUTTON].fire(&ditems[CANCEL_BUTTON]);
if (status & DITEM_RESTORE) {
touchwin(save);
wrefresh(save);
}
delwin(save);
}
rval = 1;
key = ESC; /* Run away! */
break;
}
/* 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_IS_UP(key) || KEY_IS_DOWN(key)) {
if (key >= '1' && key <= MIN('9', '0'+max_choice))
i = key - '1';
else if (KEY_IS_UP(key)) {
if (!choice) {
if (scroll) {
/* 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, DREF(ditems, scroll), menu_width, tag_x, item_x);
scrollok(menu, TRUE);
wscrl(menu, -1);
scrollok(menu, FALSE);
}
scroll--;
print_item(menu, items[scroll * 2], items[scroll * 2 + 1], 0, TRUE, DREF(ditems, scroll), menu_width, tag_x, item_x);
wnoutrefresh(menu);
print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
wrefresh(dialog);
}
continue; /* wait for another key press */
}
else
i = choice - 1;
}
else if (KEY_IS_DOWN(key))
if (choice == max_choice - 1) {
if (scroll + choice < item_no - 1) {
/* 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, DREF(ditems, scroll + max_choice - 1), menu_width, tag_x, item_x);
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, DREF(ditems, scroll + max_choice - 1), menu_width, tag_x, item_x);
wnoutrefresh(menu);
print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
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, DREF(ditems, scroll + choice), menu_width, tag_x, item_x);
/* Highlight new item */
choice = i;
print_item(menu, items[(scroll + choice) * 2], items[(scroll + choice) * 2 + 1], choice, TRUE, DREF(ditems, scroll + choice), menu_width, tag_x, item_x);
wnoutrefresh(menu);
wmove(dialog, cur_y, cur_x); /* Restore cursor to previous position */
wrefresh(dialog);
}
continue; /* wait for another key press */
}
switch (key) {
case KEY_PPAGE:
if (scroll > height - 4) { /* can we go up? */
scroll -= (height - 4);
} else {
scroll = 0;
}
redraw_menu = TRUE;
break;
case KEY_NPAGE:
if (scroll + menu_height >= item_no-1 - menu_height) { /* can we go down a full page? */
scroll = item_no - menu_height;
if (scroll < 0)
scroll = 0;
} else {
scroll += menu_height;
}
redraw_menu = TRUE;
break;
case KEY_HOME:
scroll = 0;
choice = 0;
redraw_menu = TRUE;
break;
case KEY_END:
scroll = item_no - menu_height;
if (scroll < 0)
scroll = 0;
choice = max_choice - 1;
redraw_menu = TRUE;
break;
case KEY_BTAB:
case TAB:
case KEY_LEFT:
case KEY_RIGHT:
button = !button;
if (ditems && result) {
print_button(dialog, ditems[CANCEL_BUTTON].prompt, y, x + strlen(ditems[OK_BUTTON].prompt) + 5,
ditems[CANCEL_BUTTON].checked ? ditems[CANCEL_BUTTON].checked(&ditems[CANCEL_BUTTON]) : button);
print_button(dialog, ditems[OK_BUTTON].prompt, y, x,
ditems[OK_BUTTON].checked ? ditems[OK_BUTTON].checked(&ditems[OK_BUTTON]) : !button);
}
else {
print_button(dialog, "Cancel", y, x + 14, button);
print_button(dialog, " OK ", y, x, !button);
}
wrefresh(dialog);
break;
case ' ':
case '\r':
case '\n':
if (!button) {
/* A fire routine can do just about anything to the screen, so be prepared
to accept some hints as to what to do in the aftermath. */
if (ditems) {
if (ditems[scroll + choice].fire) {
int status;
WINDOW *save;
save = dupwin(newscr);
status = ditems[scroll + choice].fire(&ditems[scroll + choice]);
if (status & DITEM_RESTORE) {
touchwin(save);
wrefresh(save);
}
delwin(save);
if (status & DITEM_CONTINUE)
continue;
else if (status & DITEM_LEAVE_MENU) {
/* Allow a fire action to take us out of the menu */
key = ESC;
break;
}
else if (status & DITEM_RECREATE) {
delwin(menu);
delwin(dialog);
dialog_clear();
goto draw;
}
}
}
else if (result)
strcpy(result, items[(scroll+choice)*2]);
}
rval = button;
key = ESC;
break;
case ESC:
rval = -1;
break;
case KEY_F(1):
case '?':
display_helpfile();
break;
}
/* save info about menu item position */
if (ch)
*ch = choice;
if (sc)
*sc = scroll;
if (redraw_menu) {
for (i = 0; i < max_choice; i++) {
print_item(menu, items[(scroll + i) * 2], items[(scroll + i) * 2 + 1], i, i == choice, DREF(ditems, scroll + i), menu_width, tag_x, item_x);
}
wnoutrefresh(menu);
getyx(dialog, cur_y, cur_x); /* Save cursor position */
print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
wmove(dialog, cur_y, cur_x); /* Restore cursor to previous position */
wrefresh(dialog);
redraw_menu = FALSE;
}
}
delwin(menu);
delwin(dialog);
return rval;
}
/*
* Print menu item
*/
static void
print_item(WINDOW *win, unsigned char *tag, unsigned char *item, int choice, int selected, dialogMenuItem *me, int menu_width, int tag_x, int item_x)
{
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);
waddnstr(win, tag + 1, item_x - tag_x - 3);
wmove(win, choice, item_x);
wattrset(win, selected ? item_selected_attr : item_attr);
waddnstr(win, item, menu_width - item_x - 1);
/* If have a selection handler for this, call it */
if (me && me->selected) {
wrefresh(win);
me->selected(me, selected);
}
}
/* End of print_item() */
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