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+ * Copyright 2018-2019,2020 Thomas E. Dickey *
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- * @Id: curs_scroll.3x,v 1.15 2010/12/04 18:40:45 tom Exp @
+ * @Id: curs_scroll.3x,v 1.19 2020/10/24 09:45:48 tom Exp @
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<H1 class="no-header">curs_scroll 3x</H1>
<PRE>
-<STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG> <STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>
+<STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>
<STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
- <STRONG>int</STRONG> <STRONG>scroll(WINDOW</STRONG> <STRONG>*win);</STRONG>
- <STRONG>int</STRONG> <STRONG>scrl(int</STRONG> <STRONG>n);</STRONG>
- <STRONG>int</STRONG> <STRONG>wscrl(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>n);</STRONG>
+ <STRONG>int</STRONG> <STRONG>scroll(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
+
+ <STRONG>int</STRONG> <STRONG>scrl(int</STRONG> <EM>n</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>wscrl(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
- The <STRONG>scroll</STRONG> routine scrolls the window up one line. This
- involves moving the lines in the window data structure.
- As an optimization, if the scrolling region of the window
- is the entire screen, the physical screen may be scrolled
- at the same time.
+ The <STRONG>scroll</STRONG> routine scrolls the window up one line. This involves mov-
+ ing the lines in the window data structure. As an optimization, if the
+ scrolling region of the window is the entire screen, the <EM>physical</EM>
+ <EM>screen</EM> may be scrolled at the same time.
- For positive <EM>n</EM>, the <STRONG>scrl</STRONG> and <STRONG>wscrl</STRONG> routines scroll the
- window up <EM>n</EM> lines (line <EM>i</EM>+<EM>n</EM> becomes <EM>i</EM>); otherwise scroll
- the window down <EM>n</EM> lines. This involves moving the lines
- in the window character image structure. The current cur-
- sor position is not changed.
+ For positive <EM>n</EM>, the <STRONG>scrl</STRONG> and <STRONG>wscrl</STRONG> routines scroll the window up <EM>n</EM>
+ lines (line <EM>i</EM>+<EM>n</EM> becomes <EM>i</EM>); otherwise scroll the window down <EM>n</EM> lines.
+ This involves moving the lines in the window character image structure.
+ The current cursor position is not changed.
- For these functions to work, scrolling must be enabled via
- <STRONG>scrollok</STRONG>.
+ For these functions to work, scrolling must be enabled via <STRONG>scrollok</STRONG>.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- These routines return <STRONG>ERR</STRONG> upon failure, and <STRONG>OK</STRONG> (SVr4 only
- specifies "an integer value other than <STRONG>ERR</STRONG>") upon success-
- ful completion.
+ These routines return <STRONG>ERR</STRONG> upon failure, and <STRONG>OK</STRONG> (SVr4 only specifies "an
+ integer value other than <STRONG>ERR</STRONG>") upon successful completion.
X/Open defines no error conditions.
- This implementation returns an error if the window pointer
- is null, or if scrolling is not enabled in the window,
- e.g., with <STRONG>scrollok</STRONG>.
+ This implementation returns an error if the window pointer is null, or
+ if scrolling is not enabled in the window, e.g., with <STRONG>scrollok</STRONG>.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
Note that <STRONG>scrl</STRONG> and <STRONG>scroll</STRONG> may be macros.
- The SVr4 documentation says that the optimization of phys-
- ically scrolling immediately if the scroll region is the
- entire screen "is" performed, not "may be" performed.
- This implementation deliberately does not guarantee that
- this will occur, to leave open the possibility of smarter
- optimization of multiple scroll actions on the next up-
- date.
+ The SVr4 documentation says that the optimization of physically
+ scrolling immediately if the scroll region is the entire screen "is"
+ performed, not "may be" performed. This implementation deliberately
+ does not guarantee that this will occur, to leave open the possibility
+ of smarter optimization of multiple scroll actions on the next update.
- Neither the SVr4 nor the XSI documentation specify whether
- the current attribute or current color-pair of blanks gen-
- erated by the scroll function is zeroed. Under this im-
- plementation it is.
+ Neither the SVr4 nor the XSI documentation specify whether the current
+ attribute or current color-pair of blanks generated by the scroll func-
+ tion is zeroed. Under this implementation it is.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
- The XSI Curses standard, Issue 4 describes these func-
- tions.
+ The XSI Curses standard, Issue 4 describes these functions.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
- <STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>
+
<STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>
</PRE>
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