1 /****************************************************************************
2  * Copyright (c) 1998 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 
36 /*
37 **	lib_mvwin.c
38 **
39 **	The routine mvwin().
40 **
41 */
42 
43 #include <curses.priv.h>
44 
45 MODULE_ID("$Id: lib_mvwin.c,v 1.7 1998/02/11 12:13:55 tom Exp $")
46 
47 int mvwin(WINDOW *win, int by, int bx)
48 {
49 	T((T_CALLED("mvwin(%p,%d,%d)"), win, by, bx));
50 
51 	if (!win || (win->_flags & _ISPAD))
52 	    returnCode(ERR);
53 
54 	/* Copying subwindows is allowed, but it is expensive... */
55 	if (win->_flags & _SUBWIN) {
56 	  int err = ERR;
57 	  WINDOW *parent = win->_parent;
58 	  if (parent)
59 	    { /* Now comes the complicated and costly part, you should really
60 	       * try to avoid to move subwindows. Because a subwindow shares
61 	       * the text buffers with its parent, one can't do a simple
62 	       * memmove of the text buffers. One has to create a copy, then
63 	       * to relocate the subwindow and then to do a copy.
64 	       */
65 	      if ((by - parent->_begy == win->_pary) &&
66 		  (bx - parent->_begx == win->_parx))
67 		err=OK; /* we don't actually move */
68 	      else {
69 		WINDOW* clone = dupwin(win);
70 		if (clone) {
71 		  /* now we have the clone, so relocate win */
72 
73 		  werase(win);             /* Erase the original place     */
74 		  wbkgd(win,parent->_bkgd);/* fill with parents background */
75 		  wsyncup(win);            /* Tell the parent(s)           */
76 
77 		  err = mvderwin(win,
78 				 by - parent->_begy,
79 				 bx - parent->_begx);
80 		  if (err!=ERR) {
81 		    err = copywin(clone,win,
82 				  0, 0, 0, 0, win->_maxy, win->_maxx, 0);
83 		    if (ERR!=err)
84 		      wsyncup(win);
85 		  }
86 		  if (ERR==delwin(clone))
87 		    err=ERR;
88 		}
89 	      }
90 	    }
91 	  returnCode(err);
92 	}
93 
94 	if (by + win->_maxy > screen_lines - 1
95 	||  bx + win->_maxx > screen_columns - 1
96 	||  by < 0
97 	||  bx < 0)
98 	    returnCode(ERR);
99 
100 	/*
101 	 * Whether or not the window is moved, touch the window's contents so
102 	 * that a following call to 'wrefresh()' will paint the window at the
103 	 * new location.  This ensures that if the caller has refreshed another
104 	 * window at the same location, that this one will be displayed.
105 	 */
106 	win->_begy = by;
107 	win->_begx = bx;
108 	returnCode(touchwin(win));
109 }
110