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lib_mvwin.c
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00001 /****************************************************************************
00002  * Copyright (c) 1998,2000,2001 Free Software Foundation, Inc.              *
00003  *                                                                          *
00004  * Permission is hereby granted, free of charge, to any person obtaining a  *
00005  * copy of this software and associated documentation files (the            *
00006  * "Software"), to deal in the Software without restriction, including      *
00007  * without limitation the rights to use, copy, modify, merge, publish,      *
00008  * distribute, distribute with modifications, sublicense, and/or sell       *
00009  * copies of the Software, and to permit persons to whom the Software is    *
00010  * furnished to do so, subject to the following conditions:                 *
00011  *                                                                          *
00012  * The above copyright notice and this permission notice shall be included  *
00013  * in all copies or substantial portions of the Software.                   *
00014  *                                                                          *
00015  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
00016  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
00017  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
00018  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
00019  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
00020  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
00021  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
00022  *                                                                          *
00023  * Except as contained in this notice, the name(s) of the above copyright   *
00024  * holders shall not be used in advertising or otherwise to promote the     *
00025  * sale, use or other dealings in this Software without prior written       *
00026  * authorization.                                                           *
00027  ****************************************************************************/
00028 
00029 /****************************************************************************
00030  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
00031  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
00032  ****************************************************************************/
00033 
00034 /*
00035 **     lib_mvwin.c
00036 **
00037 **     The routine mvwin().
00038 **
00039 */
00040 
00041 #include <curses.priv.h>
00042 
00043 MODULE_ID("$Id: lib_mvwin.c,v 1.12 2001/12/19 01:06:22 tom Exp $")
00044 
00045 NCURSES_EXPORT(int)
00046 mvwin(WINDOW *win, int by, int bx)
00047 {
00048     T((T_CALLED("mvwin(%p,%d,%d)"), win, by, bx));
00049 
00050     if (!win || (win->_flags & _ISPAD))
00051        returnCode(ERR);
00052 
00053     /* Copying subwindows is allowed, but it is expensive... */
00054     if (win->_flags & _SUBWIN) {
00055        int err = ERR;
00056        WINDOW *parent = win->_parent;
00057        if (parent) {        /* Now comes the complicated and costly part, you should really
00058                              * try to avoid to move subwindows. Because a subwindow shares
00059                              * the text buffers with its parent, one can't do a simple
00060                              * memmove of the text buffers. One has to create a copy, then
00061                              * to relocate the subwindow and then to do a copy.
00062                              */
00063            if ((by - parent->_begy == win->_pary) &&
00064               (bx - parent->_begx == win->_parx))
00065               err = OK;     /* we don't actually move */
00066            else {
00067               WINDOW *clone = dupwin(win);
00068               if (clone) {
00069                   /* now we have the clone, so relocate win */
00070 
00071                   werase(win);     /* Erase the original place     */
00072                   /* fill with parents background */
00073                   wbkgrnd(win, CHREF(parent->_nc_bkgd));
00074                   wsyncup(win);    /* Tell the parent(s)           */
00075 
00076                   err = mvderwin(win,
00077                                by - parent->_begy,
00078                                bx - parent->_begx);
00079                   if (err != ERR) {
00080                      err = copywin(clone, win,
00081                                   0, 0, 0, 0, win->_maxy, win->_maxx, 0);
00082                      if (ERR != err)
00083                          wsyncup(win);
00084                   }
00085                   if (ERR == delwin(clone))
00086                      err = ERR;
00087               }
00088            }
00089        }
00090        returnCode(err);
00091     }
00092 
00093     if (by + win->_maxy > screen_lines - 1
00094        || bx + win->_maxx > screen_columns - 1
00095        || by < 0
00096        || bx < 0)
00097        returnCode(ERR);
00098 
00099     /*
00100      * Whether or not the window is moved, touch the window's contents so
00101      * that a following call to 'wrefresh()' will paint the window at the
00102      * new location.  This ensures that if the caller has refreshed another
00103      * window at the same location, that this one will be displayed.
00104      */
00105     win->_begy = by;
00106     win->_begx = bx;
00107     returnCode(touchwin(win));
00108 }