|
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXTENSIONS | NOTES | PORTABILITY | SEE ALSO | COLOPHON |
curs_slk(3X) curs_slk(3X)
slk_init, slk_set, slk_wset, slk_refresh, slk_noutrefresh, slk_label,
slk_clear, slk_restore, slk_touch, slk_attron, slk_attrset,
slk_attroff, slk_attr_on, slk_attr_set, slk_attr_off, slk_attr,
slk_color, extended_slk_color - curses soft label routines
#include <curses.h>
int slk_init(int fmt);
int slk_set(int labnum, const char *label, int fmt);
int slk_wset(int labnum, const wchar_t *label, int fmt);
char *slk_label(int labnum);
int slk_refresh(void);
int slk_noutrefresh(void);
int slk_clear(void);
int slk_restore(void);
int slk_touch(void);
int slk_attron(const chtype attrs);
int slk_attroff(const chtype attrs);
int slk_attrset(const chtype attrs);
int slk_attr_on(attr_t attrs, void* opts);
int slk_attr_off(const attr_t attrs, void * opts);
int slk_attr_set(const attr_t attrs, short pair, void* opts);
attr_t slk_attr(void);
int slk_color(short pair);
/* extension */
int extended_slk_color(int pair);
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, curses takes over the bottom line of stdscr, reducing
the size of stdscr and the variable LINES. curses 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 useful for PC-like
enduser devices. ncurses simulates this mode by taking over up to
two lines at the bottom of the screen; it does not try to use any
hardware support for this mode.
Initialization
The slk_init routine must be called before initscr or newterm is
called. If initscr eventually uses a line from stdscr to emulate the
soft labels, then fmt determines how the labels are arranged on the
screen:
0 indicates a 3-2-3 arrangement of the labels.
1 indicates a 4-4 arrangement
2 indicates the PC-like 4-4-4 mode.
3 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.
Labels
The slk_set routine (and the slk_wset routine for the wide-character
library) has three parameters:
labnum
is the label number, from 1 to 8 (12 for fmt in slk_init is 2
or 3);
label
is be the string to put on the label, up to eight (five for
fmt in slk_init is 2 or 3) characters in length. A null
string or a null pointer sets up a blank label.
fmt is either 0, 1, or 2, indicating whether the label is to be
left-justified, centered, or right-justified, respectively,
within the label.
The slk_label routine returns the current label for label number
labnum, with leading and trailing blanks stripped.
Screen updates
The slk_refresh and slk_noutrefresh routines correspond to the
wrefresh and wnoutrefresh routines.
The slk_clear routine clears the soft labels from the screen.
The slk_restore routine restores the soft labels to the screen after
a slk_clear has been performed.
The slk_touch routine forces all the soft labels to be output the
next time a slk_noutrefresh is performed.
Video attributes
The slk_attron, slk_attrset, slk_attroff and slk_attr routines
correspond to attron, attrset, attroff and attr_get. 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).
Colors
The slk_color routine corresponds to color_set. It has an effect
only if soft labels are simulated on the bottom line of the screen.
Because slk_color accepts only short (signed 16-bit integer) values,
this implementation provides extended_slk_color which accepts an
integer value, e.g., 32-bits.
These routines return ERR upon failure and OK (SVr4 specifies only
"an integer value other than ERR") upon successful completion.
X/Open defines no error conditions. In this implementation
slk_attr
returns the attribute used for the soft keys.
slk_attroff, slk_attron, slk_clear, slk_noutrefresh, slk_refresh,
slk_touch
return an error if the terminal or the softkeys were not ini‐
tialized.
slk_attrset
returns an error if the terminal or the softkeys were not
initialized.
slk_attr_set
returns an error if the terminal or the softkeys were not
initialized, or the color pair is outside the range 0..COL‐
OR_PAIRS-1.
slk_color
returns an error if the terminal or the softkeys were not
initialized, or the color pair is outside the range 0..COL‐
OR_PAIRS-1.
slk_init
returns an error if the format parameter is outside the range
0..3.
slk_label
returns NULL on error.
slk_set
returns an error if the terminal or the softkeys were not
initialized, or the labnum parameter is outside the range of
label counts, or if the format parameter is outside the range
0..2, or if memory for the labels cannot be allocated.
X/Open Curses documents the opts argument as reserved for future use,
saying that it must be null. This implementation uses that parameter
in ABI 6 for the functions which have a color-pair parameter to
support extended color pairs.
For functions which modify the color, e.g., slk_attr_set, if opts
is set it is treated as a pointer to int, and used to set the
color pair instead of the short pair parameter.
Most applications would use slk_noutrefresh because a wrefresh is
likely to follow soon.
The XSI Curses standard, Issue 4, described the soft-key functions,
with some differences from SVr4 curses:
· It added functions like the SVr4 attribute-manipulation functions
slk_attron, slk_attroff, slk_attrset, but which use attr_t
parameters (rather than chtype), along with a reserved opts
parameter.
Two of these new functions (unlike the SVr4 functions) have no
provision for color: slk_attr_on and slk_attr_off.
The third function (slk_attr_set) has a color-pair parameter.
· It added const qualifiers to parameters (unnecessarily), and
· It added slk_color.
The format codes 2 and 3 for slk_init and the function slk_attr are
specific to ncurses.
X/Open Curses does not specify a limit for the number of colors and
color pairs which a terminal can support. However, in its use of
short for the parameters, it carries over SVr4's implementation
detail for the compiled terminfo database, which uses signed 16-bit
numbers. This implementation provides extended versions of those
functions which use short parameters, allowing applications to use
larger color- and pair-numbers.
curses(3X), curs_attr(3X), curs_initscr(3X), curs_refresh(3X),
curs_variables(3X).
This page is part of the ncurses (new curses) project. Information
about the project can be found at
⟨https://www.gnu.org/software/ncurses/ncurses.html⟩. If you have a
bug report for this manual page, send it to
bug-ncurses-request@gnu.org. This page was obtained from the
project's upstream Git mirror of the CVS repository
⟨git://ncurses.scripts.mit.edu/ncurses.git⟩ on 2017-07-05. If you
discover any rendering problems in this HTML version of the page, or
you believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
curs_slk(3X)