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- * Copyright (c) 1998-2013,2015 Free Software Foundation, Inc. *
+ * Copyright 2018-2019,2020 Thomas E. Dickey *
+ * Copyright 1998-2015,2017 Free Software Foundation, Inc. *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* Author: Thomas E. Dickey 1996-on
- * @Id: resizeterm.3x,v 1.21 2015/09/26 19:55:32 tom Exp @
+ * @Id: resizeterm.3x,v 1.27 2020/02/02 23:34:34 tom Exp @
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<H1 class="no-header">resizeterm 3x</H1>
<PRE>
-<STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG> <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
+<STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
<STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
-</PRE>
-<H2><a name="h2-NAME">NAME</a></H2><PRE>
- <STRONG>is_term_resized</STRONG>, <STRONG>resize_term</STRONG>, <STRONG>resizeterm</STRONG> - change the
- curses terminal size
+</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
+ <STRONG>is_term_resized</STRONG>, <STRONG>resize_term</STRONG>, <STRONG>resizeterm</STRONG> - change the curses terminal
+ size
-</PRE>
-<H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
+</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>bool</STRONG> <STRONG>is_term_resized(int</STRONG> <STRONG>lines,</STRONG> <STRONG>int</STRONG> <STRONG>columns);</STRONG>
<STRONG>int</STRONG> <STRONG>resizeterm(int</STRONG> <STRONG>lines,</STRONG> <STRONG>int</STRONG> <STRONG>columns);</STRONG>
-</PRE>
-<H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
- This is an extension to the curses library. It provides
- callers with a hook into the <STRONG>ncurses</STRONG> data to resize win-
- dows, primarily for use by programs running in an X Window
- terminal (e.g., xterm).
+</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
+ This is an extension to the curses library. It provides callers with a
+ hook into the <STRONG>ncurses</STRONG> data to resize windows, primarily for use by pro-
+ grams running in an X Window terminal (e.g., xterm).
-</PRE>
-<H3><a name="h3-resizeterm">resizeterm</a></H3><PRE>
- The function <STRONG>resizeterm</STRONG> resizes the standard and current
- windows to the specified dimensions, and adjusts other
- bookkeeping data used by the <STRONG>ncurses</STRONG> library that record
- the window dimensions such as the <STRONG>LINES</STRONG> and <STRONG>COLS</STRONG> vari-
- ables.
+</PRE><H3><a name="h3-resizeterm">resizeterm</a></H3><PRE>
+ The function <STRONG>resizeterm</STRONG> resizes the standard and current windows to the
+ specified dimensions, and adjusts other bookkeeping data used by the
+ <STRONG>ncurses</STRONG> library that record the window dimensions such as the <STRONG>LINES</STRONG> and
+ <STRONG>COLS</STRONG> variables.
-</PRE>
-<H3><a name="h3-resize_term">resize_term</a></H3><PRE>
- Most of the work is done by the inner function
- <STRONG>resize_term</STRONG>. The outer function <STRONG>resizeterm</STRONG> adds bookkeep-
- ing for the SIGWINCH handler. When resizing the windows,
- <STRONG>resize_term</STRONG> blank-fills the areas that are extended. The
- calling application should fill in these areas with appro-
- priate data. The <STRONG>resize_term</STRONG> function attempts to resize
- all windows. However, due to the calling convention of
- pads, it is not possible to resize these without addi-
- tional interaction with the application.
+</PRE><H3><a name="h3-resize_term">resize_term</a></H3><PRE>
+ Most of the work is done by the inner function <STRONG>resize_term</STRONG>. The outer
+ function <STRONG>resizeterm</STRONG> adds bookkeeping for the <STRONG>SIGWINCH</STRONG> handler, as well
+ as repainting the soft-key area (see <STRONG><A HREF="curs_slk.3x.html">slk_touch(3x)</A></STRONG>).
+ When resizing the windows, <STRONG>resize_term</STRONG> blank-fills the areas that are
+ extended. The calling application should fill in these areas with
+ appropriate data.
-</PRE>
-<H3><a name="h3-is_term_resized">is_term_resized</a></H3><PRE>
- A support function <STRONG>is_term_resized</STRONG> is provided so that
- applications can check if the <STRONG>resize_term</STRONG> function would
- modify the window structures. It returns <STRONG>TRUE</STRONG> if the win-
- dows would be modified, and <STRONG>FALSE</STRONG> otherwise.
+ The <STRONG>resize_term</STRONG> function attempts to resize all windows. However, due
+ to the calling convention of pads, it is not possible to resize these
+ without additional interaction with the application.
+ When resizing windows, <STRONG>resize_term</STRONG> recursively adjusts subwindows,
+ keeping them within the updated parent window's limits. If a top-level
+ window happens to extend to the screen's limits, then on resizing the
+ window, <STRONG>resize_term</STRONG> will keep the window extending to the corresponding
+ limit, regardless of whether the screen has shrunk or grown.
-</PRE>
-<H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- Except as noted, these functions return the integer <STRONG>ERR</STRONG>
- upon failure and <STRONG>OK</STRONG> on success. They will fail if either
- of the dimensions are less than or equal to zero, or if an
- error occurs while (re)allocating memory for the windows.
+</PRE><H3><a name="h3-is_term_resized">is_term_resized</a></H3><PRE>
+ A support function <STRONG>is_term_resized</STRONG> is provided so that applications can
+ check if the <STRONG>resize_term</STRONG> function would modify the window structures.
+ It returns <STRONG>TRUE</STRONG> if the windows would be modified, and <STRONG>FALSE</STRONG> otherwise.
-</PRE>
-<H2><a name="h2-NOTES">NOTES</a></H2><PRE>
- While these functions are intended to be used to support a
- signal handler (i.e., for SIGWINCH), care should be taken
- to avoid invoking them in a context where <STRONG>malloc</STRONG> or <STRONG>real-</STRONG>
- <STRONG>loc</STRONG> may have been interrupted, since it uses those func-
- tions.
- If ncurses is configured to supply its own SIGWINCH han-
- dler,
+</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
+ Except as noted, these functions return the integer <STRONG>ERR</STRONG> upon failure
+ and <STRONG>OK</STRONG> on success. They will fail if either of the dimensions are less
+ than or equal to zero, or if an error occurs while (re)allocating mem-
+ ory for the windows.
+
+
+</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
+ While these functions are intended to be used to support a signal han-
+ dler (i.e., for <STRONG>SIGWINCH</STRONG>), care should be taken to avoid invoking them
+ in a context where <STRONG>malloc</STRONG> or <STRONG>realloc</STRONG> may have been interrupted, since
+ it uses those functions.
+
+ If ncurses is configured to supply its own <STRONG>SIGWINCH</STRONG> handler,
- <STRONG>o</STRONG> on receipt of a SIGWINCH, the handler sets a flag
+ <STRONG>o</STRONG> on receipt of a <STRONG>SIGWINCH</STRONG>, the handler sets a flag
- <STRONG>o</STRONG> which is tested in <STRONG>wgetch</STRONG> and <STRONG>doupdate</STRONG>,
+ <STRONG>o</STRONG> which is tested in <STRONG><A HREF="curs_getch.3x.html">wgetch(3x)</A></STRONG> and <STRONG>doupdate</STRONG>,
<STRONG>o</STRONG> in turn, calling the <STRONG>resizeterm</STRONG> function,
- <STRONG>o</STRONG> which <STRONG>ungetch</STRONG>'s a <STRONG>KEY_RESIZE</STRONG> which will be read on the
- next call to <STRONG>wgetch</STRONG>.
+ <STRONG>o</STRONG> which <STRONG>ungetch</STRONG>'s a <STRONG>KEY_RESIZE</STRONG> which will be read on the next call to
+ <STRONG>wgetch</STRONG>.
- The <STRONG>KEY_RESIZE</STRONG> alerts an application that the screen
- size has changed, and that it should repaint special
- features such as pads that cannot be done automati-
- cally.
+ The <STRONG>KEY_RESIZE</STRONG> alerts an application that the screen size has
+ changed, and that it should repaint special features such as pads
+ that cannot be done automatically.
- Calling <STRONG>resizeterm</STRONG> or <STRONG>resize_term</STRONG> directly from a sig-
- nal handler is unsafe. This indirect method is used
- to provide a safe way to resize the ncurses data
- structures.
+ Calling <STRONG>resizeterm</STRONG> or <STRONG>resize_term</STRONG> directly from a signal handler is
+ unsafe. This indirect method is used to provide a safe way to
+ resize the ncurses data structures.
- If the environment variables <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG> are set,
- this overrides the library's use of the window size
- obtained from the operating system. Thus, even if a SIG-
- WINCH is received, no screen size change may be recorded.
+ If the environment variables <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG> are set, this overrides
+ the library's use of the window size obtained from the operating sys-
+ tem. Thus, even if a <STRONG>SIGWINCH</STRONG> is received, no screen size change may
+ be recorded.
-</PRE>
-<H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
It is possible to resize the screen with SVr4 curses, by
- <STRONG>o</STRONG> exiting curses with <STRONG><A HREF="endwin.3x.html">endwin(3x)</A></STRONG> and
+ <STRONG>o</STRONG> exiting curses with <STRONG><A HREF="curs_initscr.3x.html">endwin(3x)</A></STRONG> and
- <STRONG>o</STRONG> resuming using <STRONG><A HREF="refresh.3x.html">refresh(3x)</A></STRONG>.
+ <STRONG>o</STRONG> resuming using <STRONG><A HREF="curs_refresh.3x.html">refresh(3x)</A></STRONG>.
Doing that clears the screen and is visually distracting.
- This extension of ncurses was introduced in mid-1995. It
- was adopted in NetBSD curses (2001) and PDCurses (2003).
+ This extension of ncurses was introduced in mid-1995. It was adopted
+ in NetBSD curses (2001) and PDCurses (2003).
-</PRE>
-<H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>, <STRONG><A HREF="wresize.3x.html">wresize(3x)</A></STRONG>.
-</PRE>
-<H2><a name="h2-AUTHOR">AUTHOR</a></H2><PRE>
- Thomas Dickey (from an equivalent function written in 1988
- for BSD curses).
+</PRE><H2><a name="h2-AUTHOR">AUTHOR</a></H2><PRE>
+ Thomas Dickey (from an equivalent function written in 1988 for BSD
+ curses).
- <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
+
<STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
</PRE>
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