/* $OpenBSD: lib_mvwin.c,v 1.4 2023/10/17 09:52:08 nicm Exp $ */

/****************************************************************************
 * Copyright 2020,2021 Thomas E. Dickey                                     *
 * Copyright 1998-2009,2010 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.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 *     and: Thomas E. Dickey                        1996-on                 *
 *     and: Juergen Pfeifer                                                 *
 ****************************************************************************/

/*
**      lib_mvwin.c
**
**      The routine mvwin().
**
*/

#include <curses.priv.h>

MODULE_ID("$Id: lib_mvwin.c,v 1.4 2023/10/17 09:52:08 nicm Exp $")

NCURSES_EXPORT(int)
mvwin(WINDOW *win, int by, int bx)
{
#if NCURSES_SP_FUNCS
    SCREEN *sp = _nc_screen_of(win);
#endif

    T((T_CALLED("mvwin(%p,%d,%d)"), (void *) win, by, bx));

    if (!win || IS_PAD(win))
        returnCode(ERR);

    /*
     * mvwin() should only modify the indices.  See test/demo_menus.c and
     * test/movewindow.c for examples.
     */
#if 0
    /* Copying subwindows is allowed, but it is expensive... */
    if (IS_SUBWIN(win)) {
        int err = ERR;
        WINDOW *parent = win->_parent;
        if (parent) {           /* Now comes the complicated and costly part, you should really
                                 * try to avoid to move subwindows. Because a subwindow shares
                                 * the text buffers with its parent, one can't do a simple
                                 * memmove of the text buffers. One has to create a copy, then
                                 * to relocate the subwindow and then to do a copy.
                                 */
            if ((by - parent->_begy == win->_pary) &&
                (bx - parent->_begx == win->_parx))
                err = OK;       /* we don't actually move */
            else {
                WINDOW *clone = dupwin(win);
                if (clone) {
                    /* now we have the clone, so relocate win */

                    werase(win);        /* Erase the original place     */
                    /* fill with parents background */
                    wbkgrnd(win, CHREF(parent->_nc_bkgd));
                    wsyncup(win);       /* Tell the parent(s)           */

                    err = mvderwin(win,
                                   by - parent->_begy,
                                   bx - parent->_begx);
                    if (err != ERR) {
                        err = copywin(clone, win,
                                      0, 0, 0, 0, win->_maxy, win->_maxx, 0);
                        if (ERR != err)
                            wsyncup(win);
                    }
                    if (ERR == delwin(clone))
                        err = ERR;
                }
            }
        }
        returnCode(err);
    }
#endif

    if (by + win->_maxy > screen_lines(SP_PARM) - 1
        || bx + win->_maxx > screen_columns(SP_PARM) - 1
        || by < 0
        || bx < 0)
        returnCode(ERR);

    /*
     * Whether or not the window is moved, touch the window's contents so
     * that a following call to 'wrefresh()' will paint the window at the
     * new location.  This ensures that if the caller has refreshed another
     * window at the same location, that this one will be displayed.
     */
    win->_begy = (NCURSES_SIZE_T) by;
    win->_begx = (NCURSES_SIZE_T) bx;
    returnCode(touchwin(win));
}