#include <curses.priv.h>
#include <term.h>
MODULE_ID("$Id: resizeterm.c,v 1.15 2002/12/28 01:21:34 tom Exp $")
#define stolen_lines (screen_lines - SP->_lines_avail)
static int current_lines;
static int current_cols;
NCURSES_EXPORT(bool)
is_term_resized(int ToLines, int ToCols)
{
return (ToLines != screen_lines
|| ToCols != screen_columns);
}
static int
child_depth(WINDOW *cmp)
{
int depth = 0;
if (cmp != 0) {
WINDOWLIST *wp;
for (wp = _nc_windows; wp != 0; wp = wp->next) {
WINDOW *tst = &(wp->win);
if (tst->_parent == cmp) {
depth = 1 + child_depth(tst);
break;
}
}
}
return depth;
}
static int
parent_depth(WINDOW *cmp)
{
int depth = 0;
if (cmp != 0) {
WINDOW *tst;
while ((tst = cmp->_parent) != 0) {
++depth;
cmp = tst;
}
}
return depth;
}
static int
adjust_window(WINDOW *win, int ToLines, int ToCols, int stolen)
{
int result;
int bottom = current_lines + SP->_topstolen - stolen;
int myLines = win->_maxy + 1;
int myCols = win->_maxx + 1;
T((T_CALLED("adjust_window(%p,%d,%d) currently %dx%d at %d,%d"),
win, ToLines, ToCols,
getmaxy(win), getmaxx(win),
getbegy(win), getbegx(win)));
if (win->_begy >= bottom) {
win->_begy += (ToLines - current_lines);
} else {
if (myLines == current_lines - stolen
&& ToLines != current_lines)
myLines = ToLines - stolen;
else if (myLines == current_lines
&& ToLines != current_lines)
myLines = ToLines;
}
if (myLines > ToLines)
myLines = ToLines;
if (myCols > ToCols)
myCols = ToCols;
if (myLines == current_lines
&& ToLines != current_lines)
myLines = ToLines;
if (myCols == current_cols
&& ToCols != current_cols)
myCols = ToCols;
result = wresize(win, myLines, myCols);
returnCode(result);
}
static int
decrease_size(int ToLines, int ToCols, int stolen)
{
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 (wp = _nc_windows; wp != 0; wp = wp->next) {
WINDOW *win = &(wp->win);
if (!(win->_flags & _ISPAD)) {
if (child_depth(win) == depth) {
if (adjust_window(win, ToLines, ToCols, stolen) != OK)
returnCode(ERR);
}
}
}
++depth;
} while (found);
returnCode(OK);
}
static int
increase_size(int ToLines, int ToCols, int stolen)
{
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 (wp = _nc_windows; wp != 0; wp = wp->next) {
WINDOW *win = &(wp->win);
if (!(win->_flags & _ISPAD)) {
if (parent_depth(win) == depth) {
if (adjust_window(win, ToLines, ToCols, stolen) != OK)
returnCode(ERR);
}
}
}
++depth;
} while (found);
returnCode(OK);
}
NCURSES_EXPORT(int)
resize_term(int ToLines, int ToCols)
{
int result = OK;
int was_stolen = (screen_lines - SP->_lines_avail);
T((T_CALLED("resize_term(%d,%d) old(%d,%d)"),
ToLines, ToCols,
screen_lines, screen_columns));
if (is_term_resized(ToLines, ToCols)) {
int myLines = current_lines = screen_lines;
int myCols = current_cols = screen_columns;
if (ToLines > screen_lines) {
increase_size(myLines = ToLines, myCols, was_stolen);
current_lines = myLines;
current_cols = myCols;
}
if (ToCols > screen_columns) {
increase_size(myLines, myCols = ToCols, was_stolen);
current_lines = myLines;
current_cols = myCols;
}
if (ToLines < myLines ||
ToCols < myCols) {
decrease_size(ToLines, ToCols, was_stolen);
}
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);
}
}
LINES = ToLines - was_stolen;
COLS = ToCols;
returnCode(result);
}
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);
clearok(curscr, TRUE);
#endif
result = resize_term(ToLines, ToCols);
}
returnCode(result);
}