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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 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 la-
bels 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 does not 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 in-
dicates 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 performed.
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 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.
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 attribute-manipulation functions slk_at-
tron, 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 ncurses.
SEE ALSO
curses(3X), curs_attr(3X), curs_initscr(3X), curs_refresh(3X)
curs_slk(3X)