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/*
* textbox.c -- implements the text box
*
* ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
* MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
*
* 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"
static void back_lines(int n);
static void print_page(WINDOW * win, int height, int width);
static void print_line(WINDOW * win, int row, int width);
static char *get_line(void);
static void print_position(WINDOW * win);
static int hscroll;
static int begin_reached, end_reached, page_length;
static const char *buf;
static const char *page;
/*
* refresh window content
*/
static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
int cur_y, int cur_x)
{
print_page(box, boxh, boxw);
print_position(dialog);
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
wrefresh(dialog);
}
/*
* Display text from a file in a dialog box.
*/
int dialog_textbox(const char *title, const char *tbuf,
int initial_height, int initial_width)
{
int i, x, y, cur_x, cur_y, key = 0;
int height, width, boxh, boxw;
int passed_end;
WINDOW *dialog, *box;
begin_reached = 1;
end_reached = 0;
page_length = 0;
hscroll = 0;
buf = tbuf;
page = buf; /* page is pointer to start of page to be displayed */
do_resize:
getmaxyx(stdscr, height, width);
if (height < 8 || width < 8)
return -ERRDISPLAYTOOSMALL;
if (initial_height != 0)
height = initial_height;
else
if (height > 4)
height -= 4;
else
height = 0;
if (initial_width != 0)
width = initial_width;
else
if (width > 5)
width -= 5;
else
width = 0;
/* center dialog box on screen */
x = (COLS - width) / 2;
y = (LINES - height) / 2;
draw_shadow(stdscr, y, x, height, width);
dialog = newwin(height, width, y, x);
keypad(dialog, TRUE);
/* Create window for box region, used for scrolling text */
boxh = height - 4;
boxw = width - 2;
box = subwin(dialog, boxh, boxw, y + 1, x + 1);
wattrset(box, dlg.dialog.atr);
wbkgdset(box, dlg.dialog.atr & A_COLOR);
keypad(box, TRUE);
/* register the new window, along with its borders */
draw_box(dialog, 0, 0, height, width,
dlg.dialog.atr, dlg.border.atr);
wattrset(dialog, dlg.border.atr);
mvwaddch(dialog, height - 3, 0, ACS_LTEE);
for (i = 0; i < width - 2; i++)
waddch(dialog, ACS_HLINE);
wattrset(dialog, dlg.dialog.atr);
wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
waddch(dialog, ACS_RTEE);
print_title(dialog, title, width);
print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE);
wnoutrefresh(dialog);
getyx(dialog, cur_y, cur_x); /* Save cursor position */
/* Print first page of text */
attr_clear(box, boxh, boxw, dlg.dialog.atr);
refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
while ((key != KEY_ESC) && (key != '\n')) {
key = wgetch(dialog);
switch (key) {
case 'E': /* Exit */
case 'e':
case 'X':
case 'x':
delwin(box);
delwin(dialog);
return 0;
case 'g': /* First page */
case KEY_HOME:
if (!begin_reached) {
begin_reached = 1;
page = buf;
refresh_text_box(dialog, box, boxh, boxw,
cur_y, cur_x);
}
break;
case 'G': /* Last page */
case KEY_END:
end_reached = 1;
/* point to last char in buf */
page = buf + strlen(buf);
back_lines(boxh);
refresh_text_box(dialog, box, boxh, boxw,
cur_y, cur_x);
break;
case 'K': /* Previous line */
case 'k':
case KEY_UP:
if (!begin_reached) {
back_lines(page_length + 1);
/* We don't call print_page() here but use
* scrolling to ensure faster screen update.
* However, 'end_reached' and 'page_length'
* should still be updated, and 'page' should
* point to start of next page. This is done
* by calling get_line() in the following
* 'for' loop. */
scrollok(box, TRUE);
wscrl(box, -1); /* Scroll box region down one line */
scrollok(box, FALSE);
page_length = 0;
passed_end = 0;
for (i = 0; i < boxh; i++) {
if (!i) {
/* print first line of page */
print_line(box, 0, boxw);
wnoutrefresh(box);
} else
/* Called to update 'end_reached' and 'page' */
get_line();
if (!passed_end)
page_length++;
if (end_reached && !passed_end)
passed_end = 1;
}
print_position(dialog);
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
wrefresh(dialog);
}
break;
case 'B': /* Previous page */
case 'b':
case KEY_PPAGE:
if (begin_reached)
break;
back_lines(page_length + boxh);
refresh_text_box(dialog, box, boxh, boxw,
cur_y, cur_x);
break;
case 'J': /* Next line */
case 'j':
case KEY_DOWN:
if (!end_reached) {
begin_reached = 0;
scrollok(box, TRUE);
scroll(box); /* Scroll box region up one line */
scrollok(box, FALSE);
print_line(box, boxh - 1, boxw);
wnoutrefresh(box);
print_position(dialog);
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
wrefresh(dialog);
}
break;
case KEY_NPAGE: /* Next page */
case ' ':
if (end_reached)
break;
begin_reached = 0;
refresh_text_box(dialog, box, boxh, boxw,
cur_y, cur_x);
break;
case '0': /* Beginning of line */
case 'H': /* Scroll left */
case 'h':
case KEY_LEFT:
if (hscroll <= 0)
break;
if (key == '0')
hscroll = 0;
else
hscroll--;
/* Reprint current page to scroll horizontally */
back_lines(page_length);
refresh_text_box(dialog, box, boxh, boxw,
cur_y, cur_x);
break;
case 'L': /* Scroll right */
case 'l':
case KEY_RIGHT:
if (hscroll >= MAX_LEN)
break;
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