linux/scripts/lxdialog/inputbox.c

/*
 *  inputbox.c -- implements the input 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"

char dialog_input_result[MAX_LEN + 1];

/*
 *  Print the termination buttons
 */
static void print_buttons(WINDOW * dialog, int height, int width, int selected)
{
	int x = width / 2 - 11;
	int y = height - 2;

	print_button(dialog, "  Ok  ", y, x, selected == 0);
	print_button(dialog, " Help ", y, x + 14, selected == 1);

	wmove(dialog, y, x + 1 + 14 * selected);
	wrefresh(dialog);
}

/*
 * Display a dialog box for inputing a string
 */
int dialog_inputbox(const char *title, const char *prompt, int height, int width,
                    const char *init)
{
	int i, x, y, box_y, box_x, box_width;
	int input_x = 0, scroll = 0, key = 0, button = -1;
	char *instr = dialog_input_result;
	WINDOW *dialog;

	/* 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);

	draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
	wattrset(dialog, border_attr);
	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
	for (i = 0; i < width - 2; i++)
		waddch(dialog, ACS_HLINE);
	wattrset(dialog, dialog_attr);
	waddch(dialog, ACS_RTEE);

	if (title != NULL && strlen(title) >= width - 2) {
		/* truncate long title -- mec */
		char *title2 = malloc(width - 2 + 1);
		memcpy(title2, title, width - 2);
		title2[width - 2] = '\0';
		title = title2;
	}

	if (title != NULL) {
		wattrset(dialog, title_attr);
		mvwaddch(dialog, 0, (width - strlen(title)) / 2 - 1, ' ');
		waddstr(dialog, (char *)title);
		waddch(dialog, ' ');
	}

	wattrset(dialog, dialog_attr);
	print_autowrap(dialog, prompt, width - 2, 1, 3);

	/* Draw the input field box */
	box_width = width - 6;
	getyx(dialog, y, x);
	box_y = y + 2;
	box_x = (width - box_width) / 2;
	draw_box(dialog, y + 1, box_x - 1, 3, box_width + 2, border_attr, dialog_attr);

	print_buttons(dialog, height, width, 0);

	/* Set up the initial value */
	wmove(dialog, box_y, box_x);
	wattrset(dialog, inputbox_attr);

	if (!init)
		instr[0] = '\0';
	else
		strcpy(instr, init);

	input_x = strlen(instr);

	if (input_x >= box_width) {
		scroll = input_x - box_width + 1;
		input_x = box_width - 1;
		for (i = 0; i < box_width - 1; i++)
			waddch(dialog, instr[scroll + i]);
	} else {
		waddstr(dialog, instr);
	}

	wmove(dialog, box_y, box_x + input_x);

	wrefresh(dialog);

	while (key != ESC) {
		key = wgetch(dialog);

		if (button == -1) {	/* Input box selected */
			switch (key) {
			case TAB:
			case KEY_UP:
			case KEY_DOWN:
				break;
			case KEY_LEFT:
				continue;
			case KEY_RIGHT:
				continue;
			case KEY_BACKSPACE:
			case 127:
				if (input_x || scroll) {
					wattrset(dialog, inputbox_attr);
					if (!input_x) {
						scroll = scroll < box_width - 1 ? 0 : scroll - (box_width - 1);
						wmove(dialog, box_y, box_x);
						for (i = 0; i < box_width; i++)
							waddch(dialog,
							       instr[scroll + input_x + i] ?
							       instr[scroll + input_x + i] : ' ');
						input_x = strlen(instr) - scroll;
					} else
						input_x--;
					instr[scroll + input_x] = '\0';
					mvwaddch(dialog, box_y, input_x + box_x, ' ');
					wmove(dialog, box_y, input_x + box_x);
					wrefresh(dialog);
				}
				continue;
			default:
				if (key < 0x100 && isprint(key)) {
					if (scroll + input_x < MAX_LEN) {
						wattrset(dialog, inputbox_attr);
						instr[scroll + input_x] = key;
						instr[scroll + input_x + 1] = '\0';
						if (input_x == box_width - 1) {
							scroll++;
							wmove(dialog, box_y, box_x);
							for (i = 0; i < box_width - 1; i++)
								waddch(dialog, instr [scroll + i]);
						} else {
							wmove(dialog, box_y, input_x++ + box_x);
							waddch(dialog, key);
						}
						wrefresh(dialog);
					} else
						flash();	/* Alarm user about overflow */
					continue;
				}
			}
		}
		switch (key) {
		case 'O':
		case 'o':
			delwin(dialog);
			return 0;
		case 'H':
		case 'h':
			delwin(dialog);
			return 1;
		case KEY_UP:
		case KEY_LEFT:
			switch (button) {
			case -1:
				button = 1;	/* Indicates "Cancel" button is selected */
				print_buttons(dialog, height, width, 1);
				break;
			case 0:
				button = -1;	/* Indicates input box is selected */
				print_buttons(dialog, height, width, 0);
				wmove(dialog, box_y, box_x + input_x);
				wrefresh(dialog);
				break;
			case 1:
				button = 0;	/* Indicates "OK" button is selected */
				print_buttons(dialog, height, width, 0);
				break;
			}
			break;
		case TAB:
		case KEY_DOWN:
		case KEY_RIGHT:
			switch (button) {
			case -1:
				button = 0;	/* Indicates "OK" button is selected */
				print_buttons(dialog, height, width, 0);
				break;
			case 0:
				button = 1;	/* Indicates "Cancel" button is selected */
				print_buttons(dialog, height, width, 1);
				break;
			case 1:
				button = -1;	/* Indicates input box is selected */
				print_buttons(dialog, height, width, 0);
				wmove(dialog, box_y, box_x + input_x);
				wrefresh(dialog);
				break;
			}
			break;
		case ' ':
		case '\n':
			delwin(dialog);
			return (button == -1 ? 0 : button);
		case 'X':
		case 'x':
			key = ESC;
		case ESC:
			break;
		}
	}

	delwin(dialog);
	return -1;		/* ESC pressed */
}