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