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/****************************************************************************
* Copyright (c) 1998,2000,2001 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: Thomas E. Dickey <dickey@clark.net> 1996,1997 *
****************************************************************************/
/*
* This is an extension to the curses library. It provides callers with a hook
* into the NCURSES data to resize windows, primarily for use by programs
* running in an X Window terminal (e.g., xterm). I abstracted this module
* from my application library for NCURSES because it must be compiled with
* the private data structures -- T.Dickey 1995/7/4.
*/
#include <curses.priv.h>
#include <term.h>
MODULE_ID("$Id: resizeterm.c,v 1.13 2002/02/02 19:26:27 tom Exp $")
NCURSES_EXPORT(bool)
is_term_resized(int ToLines, int ToCols)
{
return (ToLines != screen_lines
|| ToCols != screen_columns);
}
/*
* This function reallocates NCURSES window structures, with no side-effects
* such as ungetch().
*/
NCURSES_EXPORT(int)
resize_term(int ToLines, int ToCols)
{
int stolen = screen_lines - SP->_lines_avail;
int bottom = screen_lines + SP->_topstolen - stolen;
T((T_CALLED("resize_term(%d,%d) old(%d,%d)"),
ToLines, ToCols,
screen_lines, screen_columns));
if (is_term_resized(ToLines, ToCols)) {
WINDOWLIST *wp;
for (wp = _nc_windows; wp != 0; wp = wp->next) {
WINDOW *win = &(wp->win);
int myLines = win->_maxy + 1;
int myCols = win->_maxx + 1;
/* pads aren't treated this way */
if (win->_flags & _ISPAD)
continue;
if (win->_begy >= bottom) {
win->_begy += (ToLines - screen_lines);
} else {
if (myLines == screen_lines - stolen
&& ToLines != screen_lines)
myLines = ToLines - stolen;
else if (myLines == screen_lines
&& ToLines != screen_lines)
myLines = ToLines;
}
if (myCols == screen_columns
&& ToCols != screen_columns)
myCols = ToCols;
if (wresize(win, myLines, myCols) != OK)
returnCode(ERR);
}
screen_lines = lines = ToLines;
screen_columns = columns = ToCols;
SP->_lines_avail = lines - stolen;
if (SP->oldhash) {
FreeAndNull(SP->oldhash);
}
if (SP->newhash) {
FreeAndNull(SP->newhash);
}
}
/*
* Always update LINES, to allow for call from lib_doupdate.c which
* needs to have the count adjusted by the stolen (ripped off) lines.
*/
LINES = ToLines - stolen;
COLS = ToCols;
returnCode(OK);
}
/*
* This function reallocates NCURSES window structures. It is invoked in
* response to a SIGWINCH interrupt. Other user-defined windows may also need
* to be reallocated.
*
* Because this performs memory allocation, it should not (in general) be
* invoked directly from the signal handler.
*/
NCURSES_EXPORT(int)
resizeterm(int ToLines, int ToCols)
{
int result = OK;
SP->_sig_winch = FALSE;
T((T_CALLED("resizeterm(%d,%d) old(%d,%d)"),
ToLines, ToCols,
screen_lines, screen_columns));
if (is_term_resized(ToLines, ToCols)) {
#if USE_SIGWINCH
ungetch(KEY_RESIZE); /* so application can know this */
clearok(curscr, TRUE); /* screen contents are unknown */
#endif
result = resize_term(ToLines, ToCols);
}
returnCode(result);
}
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