curs_slk(3X) curs_slk(3X)
NAME
slk_init, slk_set, 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 -curses slk_colorcurses
curses soft label routines
SYNOPSIS
#include <curses.h>
int slk_init(int fmt);
int slk_set(int labnum, const char *label, int fmt);
int slk_refresh(void);
int slk_noutrefresh(void);
char *slk_label(int labnum);
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 color_pair_number, void* opts);
attr_t slk_attr(void);
int slk_color(short color_pair_number);
DESCRIPTION
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 char-acters characters
acters 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 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. Setting fmt to 0 indicates a 3-2-3 arrangement of the labels, 1 indicates a 4-4 arrangement
and 2 indicates the PC like 4-4-4 mode. If fmt is set to 3, 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 slk_set routine requires labnum to be a label number, from 1 to 8 (resp. 12); label 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. 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_refresh and slk_noutrefresh routines correspond to the wrefresh and wnoutrefresh routines.
The slk_label routine returns the current label for label number labnum, with leading and trailing
blanks stripped.
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 per-formed. performed.
formed.
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).
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.
RETURN VALUE
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 initialized.
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..COLOR_PAIRS-1, or opts is not null.
slk_color
returns an error if the terminal or the softkeys were not initialized, or the color pair
is outside the range 0..COLOR_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 pa-rameter parameter
rameter 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.
NOTES
Most applications would use slk_noutrefresh because a wrefresh is likely to follow soon.
PORTABILITY
The XSI Curses standard, Issue 4, describes these functions. It changes the argument type of the at-tribute-manipulation attribute-manipulation
tribute-manipulation functions slk_attron, slk_attroff, slk_attrset to be attr_t, and adds const
qualifiers. The format codes 2 and 3 for slk_init() and the function slk_attr are specific to ncurs-es. ncurses.
es.
SEE ALSO
curses(3X), curs_attr(3X), curs_initscr(3X), curs_refresh(3X)
curs_slk(3X)
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