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| Current File : //usr/src/contrib/ncurses/ncurses/base/resizeterm.c |
/****************************************************************************
* Copyright (c) 1998-2007,2008 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 *
****************************************************************************/
/*
* 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 1.34 2008/06/07 13:58:40 tom Exp $")
#define stolen_lines (screen_lines - SP->_lines_avail)
/*
* If we're trying to be reentrant, do not want any local statics.
*/
#if USE_REENTRANT
#define EXTRA_ARGS , CurLines, CurCols
#define EXTRA_DCLS , int CurLines, int CurCols
#else
static int current_lines;
static int current_cols;
#define CurLines current_lines
#define CurCols current_cols
#define EXTRA_ARGS /* nothing */
#define EXTRA_DCLS /* nothing */
#endif
#ifdef TRACE
static void
show_window_sizes(const char *name)
{
WINDOWLIST *wp;
_nc_lock_global(curses);
_tracef("%s resizing: %2d x %2d (%2d x %2d)", name, LINES, COLS,
screen_lines, screen_columns);
for (each_window(wp)) {
_tracef(" window %p is %2ld x %2ld at %2ld,%2ld",
&(wp->win),
(long) wp->win._maxy + 1,
(long) wp->win._maxx + 1,
(long) wp->win._begy,
(long) wp->win._begx);
}
_nc_unlock_global(curses);
}
#endif
/*
* Return true if the given dimensions do not match the internal terminal
* structure's size.
*/
NCURSES_EXPORT(bool)
is_term_resized(int ToLines, int ToCols)
{
T((T_CALLED("is_term_resized(%d, %d)"), ToLines, ToCols));
returnCode(ToLines > 0
&& ToCols > 0
&& (ToLines != screen_lines
|| ToCols != screen_columns));
}
/*
*/
static ripoff_t *
ripped_window(WINDOW *win)
{
ripoff_t *result = 0;
ripoff_t *rop;
if (win != 0) {
for (each_ripoff(rop)) {
if (rop->win == win && rop->line != 0) {
result = rop;
break;
}
}
}
return result;
}
/*
* Returns the number of lines from the bottom for the beginning of a ripped
* off window.
*/
static int
ripped_bottom(WINDOW *win)
{
int result = 0;
ripoff_t *rop;
if (win != 0) {
for (each_ripoff(rop)) {
if (rop->line < 0) {
result -= rop->line;
if (rop->win == win) {
break;
}
}
}
}
return result;
}
/*
* Return the number of levels of child-windows under the current window.
*/
static int
child_depth(WINDOW *cmp)
{
int depth = 0;
if (cmp != 0) {
WINDOWLIST *wp;
for (each_window(wp)) {
WINDOW *tst = &(wp->win);
if (tst->_parent == cmp) {
depth = 1 + child_depth(tst);
break;
}
}
}
return depth;
}
/*
* Return the number of levels of parent-windows above the current window.
*/
static int
parent_depth(WINDOW *cmp)
{
int depth = 0;
if (cmp != 0) {
WINDOW *tst;
while ((tst = cmp->_parent) != 0) {
++depth;
cmp = tst;
}
}
return depth;
}
/*
* FIXME: must adjust position so it's within the parent!
*/
static int
adjust_window(WINDOW *win, int ToLines, int ToCols, int stolen EXTRA_DCLS)
{
int result;
int bottom = CurLines + SP->_topstolen - stolen;
int myLines = win->_maxy + 1;
int myCols = win->_maxx + 1;
ripoff_t *rop = ripped_window(win);
T((T_CALLED("adjust_window(%p,%d,%d)%s depth %d/%d currently %ldx%ld at %ld,%ld"),
win, ToLines, ToCols,
(rop != 0) ? " (rip)" : "",
parent_depth(win),
child_depth(win),
(long) getmaxy(win), (long) getmaxx(win),
(long) getbegy(win) + win->_yoffset, (long) getbegx(win)));
if (rop != 0 && rop->line < 0) {
/*
* If it is a ripped-off window at the bottom of the screen, simply
* move it to the same relative position.
*/
win->_begy = ToLines - ripped_bottom(win) - 0 - win->_yoffset;
} else if (win->_begy >= bottom) {
/*
* If it is below the bottom of the new screen, move up by the same
* amount that the screen shrank.
*/
win->_begy += (ToLines - CurLines);
} else {
if (myLines == (CurLines - stolen)
&& ToLines != CurLines) {
myLines = ToLines - stolen;
} else if (myLines == CurLines
&& ToLines != CurLines) {
myLines = ToLines;
}
}
if (myLines > ToLines) {
myLines = ToLines;
}
if (myCols > ToCols)
myCols = ToCols;
if (myCols == CurCols
&& ToCols != CurCols)
myCols = ToCols;
result = wresize(win, myLines, myCols);
returnCode(result);
}
/*
* If we're decreasing size, recursively search for windows that have no
* children, decrease those to fit, then decrease the containing window, etc.
*/
static int
decrease_size(int ToLines, int ToCols, int stolen EXTRA_DCLS)
{
bool found;
int depth = 0;
WINDOWLIST *wp;
T((T_CALLED("decrease_size(%d, %d)"), ToLines, ToCols));
do {
found = FALSE;
TR(TRACE_UPDATE, ("decreasing size of windows to %dx%d, depth=%d",
ToLines, ToCols, depth));
for (each_window(wp)) {
WINDOW *win = &(wp->win);
if (!(win->_flags & _ISPAD)) {
if (child_depth(win) == depth) {
found = TRUE;
if (adjust_window(win, ToLines, ToCols,
stolen EXTRA_ARGS) != OK)
returnCode(ERR);
}
}
}
++depth;
} while (found);
returnCode(OK);
}
/*
* If we're increasing size, recursively search for windows that have no
* parent, increase those to fit, then increase the contained window, etc.
*/
static int
increase_size(int ToLines, int ToCols, int stolen EXTRA_DCLS)
{
bool found;
int depth = 0;
WINDOWLIST *wp;
T((T_CALLED("increase_size(%d, %d)"), ToLines, ToCols));
do {
found = FALSE;
TR(TRACE_UPDATE, ("increasing size of windows to %dx%d, depth=%d",
ToLines, ToCols, depth));
for (each_window(wp)) {
WINDOW *win = &(wp->win);
if (!(win->_flags & _ISPAD)) {
if (parent_depth(win) == depth) {
found = TRUE;
if (adjust_window(win, ToLines, ToCols,
stolen EXTRA_ARGS) != OK)
returnCode(ERR);
}
}
}
++depth;
} while (found);
returnCode(OK);
}
/*
* This function reallocates NCURSES window structures, with no side-effects
* such as ungetch().
*/
NCURSES_EXPORT(int)
resize_term(int ToLines, int ToCols)
{
int result = OK EXTRA_ARGS;
int was_stolen;
T((T_CALLED("resize_term(%d,%d) old(%d,%d)"),
ToLines, ToCols,
screen_lines, screen_columns));
if (SP == 0) {
returnCode(ERR);
}
_nc_lock_global(curses);
was_stolen = (screen_lines - SP->_lines_avail);
if (is_term_resized(ToLines, ToCols)) {
int myLines = CurLines = screen_lines;
int myCols = CurCols = screen_columns;
#ifdef TRACE
if (USE_TRACEF(TRACE_UPDATE)) {
show_window_sizes("before");
_nc_unlock_global(tracef);
}
#endif
if (ToLines > screen_lines) {
increase_size(myLines = ToLines, myCols, was_stolen EXTRA_ARGS);
CurLines = myLines;
CurCols = myCols;
}
if (ToCols > screen_columns) {
increase_size(myLines, myCols = ToCols, was_stolen EXTRA_ARGS);
CurLines = myLines;
CurCols = myCols;
}
if (ToLines < myLines ||
ToCols < myCols) {
decrease_size(ToLines, ToCols, was_stolen EXTRA_ARGS);
}
screen_lines = lines = ToLines;
screen_columns = columns = ToCols;
SP->_lines_avail = lines - was_stolen;
if (SP->oldhash) {
FreeAndNull(SP->oldhash);
}
if (SP->newhash) {
FreeAndNull(SP->newhash);
}
#ifdef TRACE
if (USE_TRACEF(TRACE_UPDATE)) {
SET_LINES(ToLines - was_stolen);
SET_COLS(ToCols);
show_window_sizes("after");
_nc_unlock_global(tracef);
}
#endif
}
/*
* Always update LINES, to allow for call from lib_doupdate.c which
* needs to have the count adjusted by the stolen (ripped off) lines.
*/
SET_LINES(ToLines - was_stolen);
SET_COLS(ToCols);
_nc_unlock_global(curses);
returnCode(result);
}
/*
* 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 = ERR;
T((T_CALLED("resizeterm(%d,%d) old(%d,%d)"),
ToLines, ToCols,
screen_lines, screen_columns));
if (SP != 0) {
result = OK;
SP->_sig_winch = FALSE;
if (is_term_resized(ToLines, ToCols)) {
#if USE_SIGWINCH
ripoff_t *rop;
bool slk_visible = (SP != 0
&& SP->_slk != 0
&& !(SP->_slk->hidden));
if (slk_visible) {
slk_clear();
}
#endif
result = resize_term(ToLines, ToCols);
#if USE_SIGWINCH
_nc_ungetch(SP, KEY_RESIZE); /* so application can know this */
clearok(curscr, TRUE); /* screen contents are unknown */
/* ripped-off lines are a special case: if we did not lengthen
* them, we haven't moved them either. repaint them, too.
*
* for the rest - stdscr and other windows - the client has to
* decide which to repaint, since without panels, ncurses does
* not know which are really on top.
*/
for (each_ripoff(rop)) {
if (rop->win != stdscr
&& rop->win != 0
&& rop->line < 0) {
if (rop->hook != _nc_slk_initialize) {
touchwin(rop->win);
wnoutrefresh(rop->win);
}
}
}
/* soft-keys are a special case: we _know_ how to repaint them */
if (slk_visible) {
slk_restore();
slk_touch();
slk_refresh();
}
#endif
}
}
returnCode(result);
}