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* @Id: curs_slk.3x,v 1.11 2001/03/03 21:05:41 Todd.C.Miller Exp @
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<H1>curs_slk 3x</H1>
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<PRE>
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</PRE>
<H2>NAME</H2><PRE>
<STRONG>slk_init</STRONG>, <STRONG>slk_set</STRONG>, <STRONG>slk_refresh</STRONG>, <STRONG>slk_noutrefresh</STRONG>,
<STRONG>slk_label</STRONG>, <STRONG>slk_clear</STRONG>, <STRONG>slk_restore</STRONG>, <STRONG>slk_touch</STRONG>, <STRONG>slk_attron</STRONG>,
<STRONG>slk_attrset</STRONG>, <STRONG>slk_attroff</STRONG>, <STRONG>slk_attr_on</STRONG>, <STRONG>slk_attr_set</STRONG>,
<STRONG>slk_attr_off</STRONG>, <STRONG>slk_attr</STRONG>, <STRONG>slk_color</STRONG> - <STRONG>curses</STRONG> soft label rou-
tines
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>slk_init(int</STRONG> <STRONG>fmt);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_set(int</STRONG> <STRONG>labnum,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*label,</STRONG> <STRONG>int</STRONG> <STRONG>fmt);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_refresh(void);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_noutrefresh(void);</STRONG>
<STRONG>char</STRONG> <STRONG>*slk_label(int</STRONG> <STRONG>labnum);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_clear(void);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_restore(void);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_touch(void);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_attron(const</STRONG> <STRONG>chtype</STRONG> <STRONG>attrs);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_attroff(const</STRONG> <STRONG>chtype</STRONG> <STRONG>attrs);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_attrset(const</STRONG> <STRONG>chtype</STRONG> <STRONG>attrs);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_attr_on(attr_t</STRONG> <STRONG>attrs,</STRONG> <STRONG>void*</STRONG> <STRONG>opts);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_attr_off(const</STRONG> <STRONG>attr_t</STRONG> <STRONG>attrs,</STRONG> <STRONG>void</STRONG> <STRONG>*</STRONG> <STRONG>opts);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_attr_set(const</STRONG> <STRONG>attr_t</STRONG> <STRONG>attrs,</STRONG>
<STRONG>short</STRONG> <STRONG>color_pair_number,</STRONG> <STRONG>void*</STRONG> <STRONG>opts);</STRONG>
<STRONG>attr_t</STRONG> <STRONG>slk_attr(void);</STRONG>
<STRONG>int</STRONG> <STRONG>slk_color(short</STRONG> <STRONG>color_pair_number);</STRONG>
</PRE>
<H2>DESCRIPTION</H2><PRE>
The slk* functions manipulate the set of soft function-key
labels that exist on many terminals. For those terminals
that do not have soft labels, <STRONG>curses</STRONG> takes over the bottom
line of <STRONG>stdscr</STRONG>, reducing the size of <STRONG>stdscr</STRONG> and the vari-
able <STRONG>LINES</STRONG>. <STRONG>curses</STRONG> standardizes on eight labels of up to
eight characters each. In addition to this, the ncurses
implementation supports a mode where it simulates 12
labels of up to five characters each. This is most common
for todays PC like enduser devices. Please note that
ncurses simulates this mode by taking over up to two lines
at the bottom of the screen, it doesn't try to use any
hardware support for this mode.
The <STRONG>slk_init</STRONG> routine must be called before <STRONG>initscr</STRONG> or
<STRONG>newterm</STRONG> is called. If <STRONG>initscr</STRONG> eventually uses a line from
<STRONG>stdscr</STRONG> to emulate the soft labels, then <EM>fmt</EM> determines how
the labels are arranged on the screen. Setting <EM>fmt</EM> to <STRONG>0</STRONG>
indicates a 3-2-3 arrangement of the labels, <STRONG>1</STRONG> indicates a
4-4 arrangement and <STRONG>2</STRONG> indicates the PC like 4-4-4 mode. If
<STRONG>fmt</STRONG> is set to <STRONG>3</STRONG>, it is again the PC like 4-4-4 mode, but
in addition an index line is generated, helping the user
to identify the key numbers easily.
The <STRONG>slk_set</STRONG> routine requires <EM>labnum</EM> to be a label number,
from <STRONG>1</STRONG> to <STRONG>8</STRONG> (resp. <STRONG>12</STRONG>); <EM>label</EM> must be the string to be put
on the label, up to eight (resp. five) characters in
length. A null string or a null pointer sets up a blank
label. <EM>fmt</EM> is either <STRONG>0</STRONG>, <STRONG>1</STRONG>, or <STRONG>2</STRONG>, indicating whether the
label is to be left-justified, centered, or right-justi-
fied, respectively, within the label.
The <STRONG>slk_refresh</STRONG> and <STRONG>slk_noutrefresh</STRONG> routines correspond to
the <STRONG>wrefresh</STRONG> and <STRONG>wnoutrefresh</STRONG> routines.
The <STRONG>slk_label</STRONG> routine returns the current label for label
number <EM>labnum</EM>, with leading and trailing blanks stripped.
The <STRONG>slk_clear</STRONG> routine clears the soft labels from the
screen.
The <STRONG>slk_restore</STRONG> routine, restores the soft labels to the
screen after a <STRONG>slk_clear</STRONG> has been performed.
The <STRONG>slk_touch</STRONG> routine forces all the soft labels to be
output the next time a <STRONG>slk_noutrefresh</STRONG> is performed.
The <STRONG>slk_attron</STRONG>, <STRONG>slk_attrset</STRONG>, <STRONG>slk_attroff</STRONG> and <STRONG>slk_attr</STRONG> rou-
tines correspond to <STRONG>attron</STRONG>, <STRONG>attrset</STRONG>, <STRONG>attroff</STRONG> and <STRONG>attr_get</STRONG>.
They have an effect only if soft labels are simulated on
the bottom line of the screen. The default highlight for
soft keys is A_STANDOUT (as in System V curses, which does
not document this fact).
The <STRONG>slk_color</STRONG> routine corresponds to <STRONG>color_set</STRONG>. It has an
effect only if soft labels are simulated on the bottom
line of the screen.
</PRE>
<H2>RETURN VALUE</H2><PRE>
These routines return <STRONG>ERR</STRONG> upon failure and OK (SVr4 speci-
fies only "an integer value other than <STRONG>ERR</STRONG>") upon success-
ful completion. <STRONG>slk_attr</STRONG> returns the attribute used for
the soft keys.
<STRONG>slk_label</STRONG> returns <STRONG>NULL</STRONG> on error.
</PRE>
<H2>NOTES</H2><PRE>
Most applications would use <STRONG>slk_noutrefresh</STRONG> because a <STRONG>wre-</STRONG>
<STRONG>fresh</STRONG> is likely to follow soon.
</PRE>
<H2>PORTABILITY</H2><PRE>
The XSI Curses standard, Issue 4, describes these func-
tions. It changes the argument type of the attribute-
manipulation functions <STRONG>slk_attron</STRONG>, <STRONG>slk_attroff</STRONG>,
<STRONG>slk_attrset</STRONG> to be <STRONG>attr_t</STRONG>, and adds <STRONG>const</STRONG> qualifiers. The
format codes <STRONG>2</STRONG> and <STRONG>3</STRONG> for <STRONG>slk_init()</STRONG> and the function
<STRONG>slk_attr</STRONG> are specific to ncurses.
</PRE>
<H2>SEE ALSO</H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>,
<STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
</PRE>
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