ncurses 5.6 - patch 20070728
[ncurses.git] / ncurses / base / resizeterm.c
index 860355024cc39e67e9de31671fab3f0f7df22e1a..01b5cb60f28d4d194e39add0667436288001f98c 100644 (file)
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998 Free Software Foundation, Inc.                        *
+ * Copyright (c) 1998-2006,2007 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            *
@@ -27,7 +27,7 @@
  ****************************************************************************/
 
 /****************************************************************************
- *  Author: Thomas E. Dickey <dickey@clark.net> 1996,1997                   *
+ *  Author: Thomas E. Dickey                                                *
  ****************************************************************************/
 
 /*
 #include <curses.priv.h>
 #include <term.h>
 
-MODULE_ID("$Id: resizeterm.c,v 1.7 1998/09/19 19:27:43 Alexander.V.Lukyanov Exp $")
+MODULE_ID("$Id: resizeterm.c,v 1.21 2007/03/10 23:45:14 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;
+
+    _tracef("%s resizing: %2d x %2d (%2d x %2d)", name, LINES, COLS,
+           screen_lines, screen_columns);
+    for (wp = _nc_windows; wp != 0; wp = wp->next) {
+       _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);
+    }
+}
+#endif
+
+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));
+}
+
+/*
+ * 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 (wp = _nc_windows; wp != 0; wp = wp->next) {
+           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;
+
+    T((T_CALLED("adjust_window(%p,%d,%d) currently %ldx%ld at %ld,%ld"),
+       win, ToLines, ToCols,
+       (long) getmaxy(win), (long) getmaxx(win),
+       (long) getbegy(win), (long) getbegx(win)));
+
+    if (win->_begy >= bottom) {
+       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 (myLines == CurLines
+       && ToLines != CurLines)
+       myLines = ToLines;
+
+    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 (wp = _nc_windows; wp != 0; wp = wp->next) {
+           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 (wp = _nc_windows; wp != 0; wp = wp->next) {
+           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 = (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 = CurLines = screen_lines;
+       int myCols = CurCols = screen_columns;
+
+#ifdef TRACE
+       if (_nc_tracing & TRACE_UPDATE)
+           show_window_sizes("before");
+#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 (_nc_tracing & TRACE_UPDATE) {
+           SET_LINES(ToLines - was_stolen);
+           SET_COLS(ToCols);
+           show_window_sizes("after");
+       }
+#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);
+
+    returnCode(result);
+}
 
 /*
  * This function reallocates NCURSES window structures.  It is invoked in
@@ -51,71 +319,26 @@ MODULE_ID("$Id: resizeterm.c,v 1.7 1998/09/19 19:27:43 Alexander.V.Lukyanov Exp
  * Because this performs memory allocation, it should not (in general) be
  * invoked directly from the signal handler.
  */
-int
+NCURSES_EXPORT(int)
 resizeterm(int ToLines, int ToCols)
 {
-       int stolen = screen_lines - SP->_lines_avail;
-       int bottom = screen_lines + SP->_topstolen - stolen;
+    int result = OK;
 
-       T((T_CALLED("resizeterm(%d,%d) old(%d,%d)"),
-               ToLines, ToCols,
-               screen_lines, screen_columns));
+    SP->_sig_winch = FALSE;
 
-       SP->_sig_winch = FALSE;
+    T((T_CALLED("resizeterm(%d,%d) old(%d,%d)"),
+       ToLines, ToCols,
+       screen_lines, screen_columns));
 
-       if (ToLines != screen_lines
-        || ToCols  != screen_columns) {
-               WINDOWLIST *wp;
+    if (is_term_resized(ToLines, ToCols)) {
 
 #if USE_SIGWINCH
-               ungetch(KEY_RESIZE);    /* so application can know this */
-               clearok(curscr, TRUE);  /* screen contents are unknown */
+       ungetch(KEY_RESIZE);    /* so application can know this */
+       clearok(curscr, TRUE);  /* screen contents are unknown */
 #endif
 
-               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;
+       result = resize_term(ToLines, ToCols);
+    }
 
-       returnCode(OK);
+    returnCode(result);
 }