1/****************************************************************************
2 * Copyright (c) 1998,2000,2001 Free Software Foundation, Inc.              *
3 *                                                                          *
4 * Permission is hereby granted, free of charge, to any person obtaining a  *
5 * copy of this software and associated documentation files (the            *
6 * "Software"), to deal in the Software without restriction, including      *
7 * without limitation the rights to use, copy, modify, merge, publish,      *
8 * distribute, distribute with modifications, sublicense, and/or sell       *
9 * copies of the Software, and to permit persons to whom the Software is    *
10 * furnished to do so, subject to the following conditions:                 *
11 *                                                                          *
12 * The above copyright notice and this permission notice shall be included  *
13 * in all copies or substantial portions of the Software.                   *
14 *                                                                          *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
23 * Except as contained in this notice, the name(s) of the above copyright   *
24 * holders shall not be used in advertising or otherwise to promote the     *
25 * sale, use or other dealings in this Software without prior written       *
26 * authorization.                                                           *
27 ****************************************************************************/
28
29/****************************************************************************
30 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32 ****************************************************************************/
33
34/*
35**	lib_mvwin.c
36**
37**	The routine mvwin().
38**
39*/
40
41#include <curses.priv.h>
42
43MODULE_ID("$Id: lib_mvwin.c,v 1.12 2001/12/19 01:06:22 tom Exp $")
44
45NCURSES_EXPORT(int)
46mvwin(WINDOW *win, int by, int bx)
47{
48    T((T_CALLED("mvwin(%p,%d,%d)"), win, by, bx));
49
50    if (!win || (win->_flags & _ISPAD))
51	returnCode(ERR);
52
53    /* Copying subwindows is allowed, but it is expensive... */
54    if (win->_flags & _SUBWIN) {
55	int err = ERR;
56	WINDOW *parent = win->_parent;
57	if (parent) {		/* Now comes the complicated and costly part, you should really
58				 * try to avoid to move subwindows. Because a subwindow shares
59				 * the text buffers with its parent, one can't do a simple
60				 * memmove of the text buffers. One has to create a copy, then
61				 * to relocate the subwindow and then to do a copy.
62				 */
63	    if ((by - parent->_begy == win->_pary) &&
64		(bx - parent->_begx == win->_parx))
65		err = OK;	/* we don't actually move */
66	    else {
67		WINDOW *clone = dupwin(win);
68		if (clone) {
69		    /* now we have the clone, so relocate win */
70
71		    werase(win);	/* Erase the original place     */
72		    /* fill with parents background */
73		    wbkgrnd(win, CHREF(parent->_nc_bkgd));
74		    wsyncup(win);	/* Tell the parent(s)           */
75
76		    err = mvderwin(win,
77				   by - parent->_begy,
78				   bx - parent->_begx);
79		    if (err != ERR) {
80			err = copywin(clone, win,
81				      0, 0, 0, 0, win->_maxy, win->_maxx, 0);
82			if (ERR != err)
83			    wsyncup(win);
84		    }
85		    if (ERR == delwin(clone))
86			err = ERR;
87		}
88	    }
89	}
90	returnCode(err);
91    }
92
93    if (by + win->_maxy > screen_lines - 1
94	|| bx + win->_maxx > screen_columns - 1
95	|| by < 0
96	|| bx < 0)
97	returnCode(ERR);
98
99    /*
100     * Whether or not the window is moved, touch the window's contents so
101     * that a following call to 'wrefresh()' will paint the window at the
102     * new location.  This ensures that if the caller has refreshed another
103     * window at the same location, that this one will be displayed.
104     */
105    win->_begy = by;
106    win->_begx = bx;
107    returnCode(touchwin(win));
108}
109