xref: /freebsd/contrib/ncurses/ncurses/base/lib_mvwin.c (revision 74bf4e164ba5851606a27d4feff27717452583e5)
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      *
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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   *
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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 
43 MODULE_ID("$Id: lib_mvwin.c,v 1.12 2001/12/19 01:06:22 tom Exp $")
44 
45 NCURSES_EXPORT(int)
46 mvwin(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