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freebsd-skq/gnu/lib/libdialog/menubox.c
jkh ff9186df13 Next round of changes - make dialog boxes drawable at arbitrary X,Y locations 
and add selection traversal callbacks so context-sensitive behavior can
even be implemented for individual menu items.  These work around the two
largest issues holding me back with some of my sysinstall changes.
1996-01-01 03:43:58 +00:00

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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);
#define DREF(di, item) ((di) ? &((di)[(item)]) : NULL)
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, 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 = 0, choice = 0,
l, k, scroll = 0, max_choice, redraw_menu = FALSE;
char okButton, cancelButton;
WINDOW *dialog, *menu;
unsigned char **items;
dialogMenuItem *ditems;
if (ch) /* restore menu item info */
choice = *ch;
if (sc)
scroll = *sc;
/* If item_no is a positive integer, use old item specification format */
if (item_no >= 0) {
items = it;
ditems = NULL;
}
/* It's the new specification format - fake the rest of the code out */
else {
item_no = abs(item_no);
ditems = it;
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) {
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) / 2;
item_x = tag_x + item_x + 2;
/* 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));
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 && result && ditems[OK_BUTTON].fire) {
if (ditems[OK_BUTTON].fire(&ditems[OK_BUTTON]) == DITEM_FAILURE)
continue;
else
delwin(dialog);
}
else {
delwin(dialog);
strcpy(result, items[(scroll+choice)*2]);
}
return 0;
}
/* Shortcut to cancel? */
else if (toupper(key) == cancelButton) {
if (ditems && result && ditems[CANCEL_BUTTON].fire) {
if (ditems[CANCEL_BUTTON].fire(&ditems[CANCEL_BUTTON]) == DITEM_FAILURE)
continue;
}
delwin(dialog);
return 1;
}
/* 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) {
/* 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));
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));
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 == KEY_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));
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));
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));
/* Highlight new item */
choice = i;
print_item(menu, items[(scroll + choice) * 2], items[(scroll + choice) * 2 + 1], choice, TRUE,
DREF(ditems, scroll + choice));
wnoutrefresh(menu);
wmove(dialog, cur_y, cur_x); /* Restore cursor to previous position */
wrefresh(dialog);
}
continue; /* wait for another key press */
}
/* save info about menu item position */
if (ch)
*ch = choice;
if (sc)
*sc = scroll;
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) {
if (button) {
print_button(dialog, ditems[OK_BUTTON].prompt, y, x,
ditems[OK_BUTTON].checked ? ditems[OK_BUTTON].checked(&ditems[OK_BUTTON]) : !button);
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);
}
else {
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 {
if (button) {
print_button(dialog, " OK ", y, x, !button);
print_button(dialog, "Cancel", y, x + 14, 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) {
if (ditems && ditems[scroll + choice].fire) {
if (ditems[scroll + choice].fire(&ditems[scroll + choice]) == DITEM_FAILURE)
continue;
}
else if (result)
strcpy(result, items[(scroll+choice)*2]);
}
delwin(dialog);
return button;
case ESC:
break;
case KEY_F(1):
case '?':
display_helpfile();
break;
}
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));
}
wnoutrefresh(menu);
print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
wrefresh(dialog);
redraw_menu = FALSE;
}
}
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, dialogMenuItem *me)
{
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);
/* 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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