X-Git-Url: http://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=ncurses%2Fbase%2Fresizeterm.c;h=9cc8081b9115ef48de76a567706d89feb6491978;hp=860355024cc39e67e9de31671fab3f0f7df22e1a;hb=46722468f47c2b77b3987729b4bcf2321cccfd01;hpb=c633e5103a29a38532cf1925257b91cea33fd090 diff --git a/ncurses/base/resizeterm.c b/ncurses/base/resizeterm.c index 86035502..9cc8081b 100644 --- a/ncurses/base/resizeterm.c +++ b/ncurses/base/resizeterm.c @@ -1,5 +1,5 @@ /**************************************************************************** - * Copyright (c) 1998 Free Software Foundation, Inc. * + * Copyright (c) 1998-2001,2002 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 1996,1997 * + * Author: Thomas E. Dickey * ****************************************************************************/ /* @@ -41,7 +41,219 @@ #include #include -MODULE_ID("$Id: resizeterm.c,v 1.7 1998/09/19 19:27:43 Alexander.V.Lukyanov Exp $") +MODULE_ID("$Id: resizeterm.c,v 1.14 2002/07/13 21:32:57 tom Exp $") + +#define stolen_lines (screen_lines - SP->_lines_avail) + +NCURSES_EXPORT(bool) +is_term_resized(int ToLines, int ToCols) +{ + return (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) +{ + int result; + int bottom = screen_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 - 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 (myLines > ToLines) + myLines = ToLines; + + if (myCols > ToCols) + myCols = ToCols; + + if (myLines == screen_lines + && ToLines != screen_lines) + myCols = ToLines; + + if (myCols == screen_columns + && ToCols != screen_columns) + 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) +{ + 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); +} + +/* + * 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) +{ + 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); +} + +/* + * 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; + 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 = screen_lines; + int myCols = screen_columns; + + if (ToLines > screen_lines) { + increase_size(myLines = ToLines, myCols, was_stolen); + } + + if (ToCols > screen_columns) { + increase_size(myLines, myCols = ToCols, was_stolen); + } + + 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); + } + } + + /* + * 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 - was_stolen; + COLS = ToCols; + + returnCode(result); +} /* * This function reallocates NCURSES window structures. It is invoked in @@ -51,71 +263,26 @@ 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); }