yann@1: /*
yann@1:  *  textbox.c -- implements the text box
yann@1:  *
yann@1:  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
yann@1:  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
yann@1:  *
yann@1:  *  This program is free software; you can redistribute it and/or
yann@1:  *  modify it under the terms of the GNU General Public License
yann@1:  *  as published by the Free Software Foundation; either version 2
yann@1:  *  of the License, or (at your option) any later version.
yann@1:  *
yann@1:  *  This program is distributed in the hope that it will be useful,
yann@1:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
yann@1:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
yann@1:  *  GNU General Public License for more details.
yann@1:  *
yann@1:  *  You should have received a copy of the GNU General Public License
yann@1:  *  along with this program; if not, write to the Free Software
yann@1:  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
yann@1:  */
yann@1: 
yann@1: #include "dialog.h"
yann@1: 
yann@1: static void back_lines(int n);
yann@1: static void print_page(WINDOW * win, int height, int width);
yann@1: static void print_line(WINDOW * win, int row, int width);
yann@1: static char *get_line(void);
yann@1: static void print_position(WINDOW * win);
yann@1: 
yann@1: static int hscroll;
yann@1: static int begin_reached, end_reached, page_length;
yann@1: static const char *buf;
yann@1: static const char *page;
yann@1: 
yann@1: /*
yann@1:  * refresh window content
yann@1:  */
yann@1: static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
yann@1: 							  int cur_y, int cur_x)
yann@1: {
yann@1: 	print_page(box, boxh, boxw);
yann@1: 	print_position(dialog);
yann@1: 	wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
yann@1: 	wrefresh(dialog);
yann@1: }
yann@1: 
yann@1: 
yann@1: /*
yann@1:  * Display text from a file in a dialog box.
yann@1:  */
yann@1: int dialog_textbox(const char *title, const char *tbuf,
yann@1: 		   int initial_height, int initial_width)
yann@1: {
yann@1: 	int i, x, y, cur_x, cur_y, key = 0;
yann@1: 	int height, width, boxh, boxw;
yann@1: 	int passed_end;
yann@1: 	WINDOW *dialog, *box;
yann@1: 
yann@1: 	begin_reached = 1;
yann@1: 	end_reached = 0;
yann@1: 	page_length = 0;
yann@1: 	hscroll = 0;
yann@1: 	buf = tbuf;
yann@1: 	page = buf;	/* page is pointer to start of page to be displayed */
yann@1: 
yann@1: do_resize:
yann@1: 	getmaxyx(stdscr, height, width);
yann@1: 	if (height < 8 || width < 8)
yann@1: 		return -ERRDISPLAYTOOSMALL;
yann@1: 	if (initial_height != 0)
yann@1: 		height = initial_height;
yann@1: 	else
yann@1: 		if (height > 4)
yann@1: 			height -= 4;
yann@1: 		else
yann@1: 			height = 0;
yann@1: 	if (initial_width != 0)
yann@1: 		width = initial_width;
yann@1: 	else
yann@1: 		if (width > 5)
yann@1: 			width -= 5;
yann@1: 		else
yann@1: 			width = 0;
yann@1: 
yann@1: 	/* center dialog box on screen */
yann@1: 	x = (COLS - width) / 2;
yann@1: 	y = (LINES - height) / 2;
yann@1: 
yann@1: 	draw_shadow(stdscr, y, x, height, width);
yann@1: 
yann@1: 	dialog = newwin(height, width, y, x);
yann@1: 	keypad(dialog, TRUE);
yann@1: 
yann@1: 	/* Create window for box region, used for scrolling text */
yann@1: 	boxh = height - 4;
yann@1: 	boxw = width - 2;
yann@1: 	box = subwin(dialog, boxh, boxw, y + 1, x + 1);
yann@1: 	wattrset(box, dlg.dialog.atr);
yann@1: 	wbkgdset(box, dlg.dialog.atr & A_COLOR);
yann@1: 
yann@1: 	keypad(box, TRUE);
yann@1: 
yann@1: 	/* register the new window, along with its borders */
yann@1: 	draw_box(dialog, 0, 0, height, width,
yann@1: 		 dlg.dialog.atr, dlg.border.atr);
yann@1: 
yann@1: 	wattrset(dialog, dlg.border.atr);
yann@1: 	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
yann@1: 	for (i = 0; i < width - 2; i++)
yann@1: 		waddch(dialog, ACS_HLINE);
yann@1: 	wattrset(dialog, dlg.dialog.atr);
yann@1: 	wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
yann@1: 	waddch(dialog, ACS_RTEE);
yann@1: 
yann@1: 	print_title(dialog, title, width);
yann@1: 
yann@943: 	print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE);
yann@1: 	wnoutrefresh(dialog);
yann@1: 	getyx(dialog, cur_y, cur_x);	/* Save cursor position */
yann@1: 
yann@1: 	/* Print first page of text */
yann@1: 	attr_clear(box, boxh, boxw, dlg.dialog.atr);
yann@1: 	refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
yann@1: 
yann@1: 	while ((key != KEY_ESC) && (key != '\n')) {
yann@1: 		key = wgetch(dialog);
yann@1: 		switch (key) {
yann@1: 		case 'E':	/* Exit */
yann@1: 		case 'e':
yann@1: 		case 'X':
yann@1: 		case 'x':
yann@1: 			delwin(box);
yann@1: 			delwin(dialog);
yann@1: 			return 0;
yann@1: 		case 'g':	/* First page */
yann@1: 		case KEY_HOME:
yann@1: 			if (!begin_reached) {
yann@1: 				begin_reached = 1;
yann@1: 				page = buf;
yann@1: 				refresh_text_box(dialog, box, boxh, boxw,
yann@1: 						 cur_y, cur_x);
yann@1: 			}
yann@1: 			break;
yann@1: 		case 'G':	/* Last page */
yann@1: 		case KEY_END:
yann@1: 
yann@1: 			end_reached = 1;
yann@1: 			/* point to last char in buf */
yann@1: 			page = buf + strlen(buf);
yann@1: 			back_lines(boxh);
yann@1: 			refresh_text_box(dialog, box, boxh, boxw,
yann@1: 					 cur_y, cur_x);
yann@1: 			break;
yann@1: 		case 'K':	/* Previous line */
yann@1: 		case 'k':
yann@1: 		case KEY_UP:
yann@1: 			if (!begin_reached) {
yann@1: 				back_lines(page_length + 1);
yann@1: 
yann@1: 				/* We don't call print_page() here but use
yann@1: 				 * scrolling to ensure faster screen update.
yann@1: 				 * However, 'end_reached' and 'page_length'
yann@1: 				 * should still be updated, and 'page' should
yann@1: 				 * point to start of next page. This is done
yann@1: 				 * by calling get_line() in the following
yann@1: 				 * 'for' loop. */
yann@1: 				scrollok(box, TRUE);
yann@1: 				wscrl(box, -1);	/* Scroll box region down one line */
yann@1: 				scrollok(box, FALSE);
yann@1: 				page_length = 0;
yann@1: 				passed_end = 0;
yann@1: 				for (i = 0; i < boxh; i++) {
yann@1: 					if (!i) {
yann@1: 						/* print first line of page */
yann@1: 						print_line(box, 0, boxw);
yann@1: 						wnoutrefresh(box);
yann@1: 					} else
yann@1: 						/* Called to update 'end_reached' and 'page' */
yann@1: 						get_line();
yann@1: 					if (!passed_end)
yann@1: 						page_length++;
yann@1: 					if (end_reached && !passed_end)
yann@1: 						passed_end = 1;
yann@1: 				}
yann@1: 
yann@1: 				print_position(dialog);
yann@1: 				wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
yann@1: 				wrefresh(dialog);
yann@1: 			}
yann@1: 			break;
yann@1: 		case 'B':	/* Previous page */
yann@1: 		case 'b':
yann@1: 		case KEY_PPAGE:
yann@1: 			if (begin_reached)
yann@1: 				break;
yann@1: 			back_lines(page_length + boxh);
yann@1: 			refresh_text_box(dialog, box, boxh, boxw,
yann@1: 					 cur_y, cur_x);
yann@1: 			break;
yann@1: 		case 'J':	/* Next line */
yann@1: 		case 'j':
yann@1: 		case KEY_DOWN:
yann@1: 			if (!end_reached) {
yann@1: 				begin_reached = 0;
yann@1: 				scrollok(box, TRUE);
yann@1: 				scroll(box);	/* Scroll box region up one line */
yann@1: 				scrollok(box, FALSE);
yann@1: 				print_line(box, boxh - 1, boxw);
yann@1: 				wnoutrefresh(box);
yann@1: 				print_position(dialog);
yann@1: 				wmove(dialog, cur_y, cur_x);	/* Restore cursor position */
yann@1: 				wrefresh(dialog);
yann@1: 			}
yann@1: 			break;
yann@1: 		case KEY_NPAGE:	/* Next page */
yann@1: 		case ' ':
yann@1: 			if (end_reached)
yann@1: 				break;
yann@1: 
yann@1: 			begin_reached = 0;
yann@1: 			refresh_text_box(dialog, box, boxh, boxw,
yann@1: 					 cur_y, cur_x);
yann@1: 			break;
yann@1: 		case '0':	/* Beginning of line */
yann@1: 		case 'H':	/* Scroll left */
yann@1: 		case 'h':
yann@1: 		case KEY_LEFT:
yann@1: 			if (hscroll <= 0)
yann@1: 				break;
yann@1: 
yann@1: 			if (key == '0')
yann@1: 				hscroll = 0;
yann@1: 			else
yann@1: 				hscroll--;
yann@1: 			/* Reprint current page to scroll horizontally */
yann@1: 			back_lines(page_length);
yann@1: 			refresh_text_box(dialog, box, boxh, boxw,
yann@1: 					 cur_y, cur_x);
yann@1: 			break;
yann@1: 		case 'L':	/* Scroll right */
yann@1: 		case 'l':
yann@1: 		case KEY_RIGHT:
yann@1: 			if (hscroll >= MAX_LEN)
yann@1: 				break;
yann@1: 			hscroll++;
yann@1: 			/* Reprint current page to scroll horizontally */
yann@1: 			back_lines(page_length);
yann@1: 			refresh_text_box(dialog, box, boxh, boxw,
yann@1: 					 cur_y, cur_x);
yann@1: 			break;
yann@1: 		case KEY_ESC:
yann@1: 			key = on_key_esc(dialog);
yann@1: 			break;
yann@1: 		case KEY_RESIZE:
yann@1: 			back_lines(height);
yann@1: 			delwin(box);
yann@1: 			delwin(dialog);
yann@1: 			on_key_resize();
yann@1: 			goto do_resize;
yann@1: 		}
yann@1: 	}
yann@1: 	delwin(box);
yann@1: 	delwin(dialog);
yann@1: 	return key;		/* ESC pressed */
yann@1: }
yann@1: 
yann@1: /*
yann@1:  * Go back 'n' lines in text. Called by dialog_textbox().
yann@1:  * 'page' will be updated to point to the desired line in 'buf'.
yann@1:  */
yann@1: static void back_lines(int n)
yann@1: {
yann@1: 	int i;
yann@1: 
yann@1: 	begin_reached = 0;
yann@1: 	/* Go back 'n' lines */
yann@1: 	for (i = 0; i < n; i++) {
yann@1: 		if (*page == '\0') {
yann@1: 			if (end_reached) {
yann@1: 				end_reached = 0;
yann@1: 				continue;
yann@1: 			}
yann@1: 		}
yann@1: 		if (page == buf) {
yann@1: 			begin_reached = 1;
yann@1: 			return;
yann@1: 		}
yann@1: 		page--;
yann@1: 		do {
yann@1: 			if (page == buf) {
yann@1: 				begin_reached = 1;
yann@1: 				return;
yann@1: 			}
yann@1: 			page--;
yann@1: 		} while (*page != '\n');
yann@1: 		page++;
yann@1: 	}
yann@1: }
yann@1: 
yann@1: /*
yann@1:  * Print a new page of text. Called by dialog_textbox().
yann@1:  */
yann@1: static void print_page(WINDOW * win, int height, int width)
yann@1: {
yann@1: 	int i, passed_end = 0;
yann@1: 
yann@1: 	page_length = 0;
yann@1: 	for (i = 0; i < height; i++) {
yann@1: 		print_line(win, i, width);
yann@1: 		if (!passed_end)
yann@1: 			page_length++;
yann@1: 		if (end_reached && !passed_end)
yann@1: 			passed_end = 1;
yann@1: 	}
yann@1: 	wnoutrefresh(win);
yann@1: }
yann@1: 
yann@1: /*
yann@1:  * Print a new line of text. Called by dialog_textbox() and print_page().
yann@1:  */
yann@1: static void print_line(WINDOW * win, int row, int width)
yann@1: {
yann@1: 	int y, x;
yann@1: 	char *line;
yann@1: 
yann@1: 	line = get_line();
yann@1: 	line += MIN(strlen(line), hscroll);	/* Scroll horizontally */
yann@1: 	wmove(win, row, 0);	/* move cursor to correct line */
yann@1: 	waddch(win, ' ');
yann@1: 	waddnstr(win, line, MIN(strlen(line), width - 2));
yann@1: 
yann@1: 	getyx(win, y, x);
yann@1: 	/* Clear 'residue' of previous line */
yann@1: #if OLD_NCURSES
yann@1: 	{
yann@1: 		int i;
yann@1: 		for (i = 0; i < width - x; i++)
yann@1: 			waddch(win, ' ');
yann@1: 	}
yann@1: #else
yann@1: 	wclrtoeol(win);
yann@1: #endif
yann@1: }
yann@1: 
yann@1: /*
yann@1:  * Return current line of text. Called by dialog_textbox() and print_line().
yann@1:  * 'page' should point to start of current line before calling, and will be
yann@1:  * updated to point to start of next line.
yann@1:  */
yann@1: static char *get_line(void)
yann@1: {
yann@1: 	int i = 0;
yann@1: 	static char line[MAX_LEN + 1];
yann@1: 
yann@1: 	end_reached = 0;
yann@1: 	while (*page != '\n') {
yann@1: 		if (*page == '\0') {
yann@1: 			if (!end_reached) {
yann@1: 				end_reached = 1;
yann@1: 				break;
yann@1: 			}
yann@1: 		} else if (i < MAX_LEN)
yann@1: 			line[i++] = *(page++);
yann@1: 		else {
yann@1: 			/* Truncate lines longer than MAX_LEN characters */
yann@1: 			if (i == MAX_LEN)
yann@1: 				line[i++] = '\0';
yann@1: 			page++;
yann@1: 		}
yann@1: 	}
yann@1: 	if (i <= MAX_LEN)
yann@1: 		line[i] = '\0';
yann@1: 	if (!end_reached)
yann@1: 		page++;		/* move pass '\n' */
yann@1: 
yann@1: 	return line;
yann@1: }
yann@1: 
yann@1: /*
yann@1:  * Print current position
yann@1:  */
yann@1: static void print_position(WINDOW * win)
yann@1: {
yann@1: 	int percent;
yann@1: 
yann@1: 	wattrset(win, dlg.position_indicator.atr);
yann@1: 	wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
yann@1: 	percent = (page - buf) * 100 / strlen(buf);
yann@1: 	wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
yann@1: 	wprintw(win, "(%3d%%)", percent);
yann@1: }