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+/****************************************************************************
+ * 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 1.32 2008/05/03 14:28:55 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(windowlist);
+ _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(windowlist);
+}
+#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(windowlist);
+
+ 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(windowlist);
+
+ 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
+ ungetch(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);
+}