Ubuntu Manpage: slk_init, slk_set, slk_wset, slk_refresh, slk_noutrefresh, slk_label, slk

Provided by: ncurses-doc_6.0+20160213-1ubuntu1_all

NAME

       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 - 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, void* opts);
       attr_t slk_attr(void);
       int slk_color(short color_pair);
       int slk_wset(int labnum, const wchar_t *label, int fmt);

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 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 today's 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.

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.

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_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