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Edit File: redraw.c

/****************************************************************************
 * Copyright (c) 2006,2007 Free Software Foundation, Inc.                   *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/
/*
 * $Id: redraw.c,v 1.4 2007/06/30 17:55:06 tom Exp $
 *
 * Demonstrate the redrawwin() and wredrawln() functions.
 * Thomas Dickey - 2006/11/4
 */

#include <test.priv.h>

static void
trash(int beg_x, int max_x, int cur_x)
{
    int x;

for (x = cur_x; x > beg_x; --x) {
	putchar('\b');
    }
    for (x = beg_x; x < max_x; ++x) {
	if (x < cur_x)
	    putchar('<');
	else if (x == cur_x)
	    putchar('=');
	else if (x > cur_x)
	    putchar('>');
    }
    for (x = max_x; x > cur_x; --x) {
	putchar('\b');
    }
}

static void
test_redraw(WINDOW *win)
{
    WINDOW *win1;
    WINDOW *win2;
    bool done = FALSE;
    int ch, y, x;
    int max_y, max_x;
    int beg_y, beg_x;

scrollok(win, TRUE);
    keypad(win, TRUE);
    getmaxyx(win, max_y, max_x);
    getbegyx(win, beg_y, beg_x);
    while (!done) {
	ch = wgetch(win);
	getyx(win, y, x);
	switch (ch) {
	case 'q':
	    /* FALLTHRU */
	case ESCAPE:
	    done = TRUE;
	    break;
	case 'w':
	    win1 = newwin(max_y, max_x,
			  beg_y, beg_x);
	    win2 = newwin(max_y - 2, max_x - 2,
			  beg_y + 1, beg_x + 1);
	    box(win1, 0, 0);
	    wrefresh(win1);

test_redraw(win2);

delwin(win2);
	    delwin(win1);

touchwin(win);
	    break;

case '!':
	    /*
	     * redrawwin() and wredrawln() do not take into account the
	     * possibility that the cursor may have moved.  That makes them
	     * cumbersome for using with a shell command.  So we simply
	     * trash the current line of the window using backspace/overwrite.
	     */
	    trash(beg_x, max_x, x + beg_x);
	    break;

#ifdef NCURSES_VERSION
	case '@':
	    /*
	     * For a shell command, we can work around the problem noted above
	     * using mvcur().  It is ifdef'd for NCURSES, since X/Open does
	     * not define the case where the old location is unknown. 
	     */
	    system("date");
	    mvcur(-1, -1, y, x);
	    break;
#endif

case CTRL('W'):
	    redrawwin(win);
	    break;

case CTRL('L'):
	    wredrawln(win, y, 1);
	    break;

case KEY_UP:
	    if (y > 0)
		wmove(win, y - 1, x);
	    break;

case KEY_DOWN:
	    if (y < max_y)
		wmove(win, y + 1, x);
	    break;

case KEY_LEFT:
	    if (x > 0)
		wmove(win, y, x - 1);
	    break;

case KEY_RIGHT:
	    if (x < max_x)
		wmove(win, y, x + 1);
	    break;

default:
	    if (ch > KEY_MIN) {
		waddstr(win, keyname(ch));
	    } else {
		waddstr(win, unctrl(UChar(ch)));
	    }
	    break;
	}
	wnoutrefresh(win);
	doupdate();
    }
}

int
main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
{
    initscr();
    raw();
    noecho();
    test_redraw(stdscr);
    endwin();
    ExitProgram(EXIT_SUCCESS);
}

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