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$Id: curs_slk.3x,v 1.71 2024/04/20 18:54:36 tom Exp $
#include <curses.h>int slk_init(int fmt);
int slk_set(int labnum, const char *label, int align); int slk_wset(int labnum, const wchar_t *label, int align);
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); /* extension */ attr_t slk_attr(void);
int slk_color(short pair); /* extension */ int extended_slk_color(int pair);
\%ncurses furthermore supports a mode comprising twelve labels of up to five characters each, following a convention associated with the IBM PC/AT keyboard. \%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.
3 0 indicates a 3-2-3 arrangement of the labels.
3 1 indicates a 4-4 arrangement
3 2 indicates the PC-like 4-4-4 mode.
3 3 is again the PC-like 4-4-4 mode, but in addition an index line is generated, helping the user to associate each label with its numbered function key. LINES and the vertical size of \%stdscr are further reduced.
8 \" "labnum" + 2n labnum is the label number, from 1 to 8 (12 if fmt in \%slk_init is 2 or 3);
label is be the string to put on the label, up to eight (five if fmt in \%slk_init is 2 or 3) characters in length. A empty string or a null pointer sets up a blank label.
align is 0 , 1 , or 2 , aligning label to the left, center, or right, respectively, within the 8 (5) character cells housing it.
\%slk_label obtains the string assigned to label number labnum, with any 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.
Because \%slk_color accepts only short (signed 16-bit integer) values, this implementation provides \%extended_slk_color, which accepts an int value of at least 32 bits.
X/Open Curses defines no error conditions.
In this implementation
5 slk_attr returns the attribute used for the soft keys.
5 slk_attroff, slk_attron, slk_clear, slk_noutrefresh, slk_refresh, slk_touch return an error if the terminal or the softkeys were not initialized.
5 slk_attrset returns an error if the terminal or the softkeys were not initialized.
5 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.
5 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.
5 slk_init returns an error if the format parameter is outside the range 0..3.
5 slk_label returns NULL on error.
5 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.
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.
Although \%slk_start is declared in the curses header file, it was not documented by SVr4 other than its presence in a list of libtermlib.so.1 symbols. Reading the source code (i.e., Illumos): .bP \%slk_start has two parameters:
.bP ng (number of groups) and .bP gp (group pointer).
The function \%slk_attr was added by \%ncurses in 1996.
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 int parameters, allowing applications to use larger color- and pair-numbers.
SVr4 added these functions: slk_attroff slk_attron slk_attrset slk_start
X/Open Curses added these: slk_attr_off slk_attr_on slk_attr_set slk_color slk_wset