NAME
attroff, wattroff, attron, wattron, attrset, wattrset, color_set,
wcolor_set, standend, wstandend, standout, wstandout, attr_get,
wattr_get, attr_off, wattr_off, attr_on, wattr_on, attr_set, wattr_set,
chgat, wchgat, mvchgat, mvwchgat, PAIR_NUMBER - curses character and
window attribute control routines
SYNOPSIS
#include <curses.h>
int attroff(int attrs);
int wattroff(WINDOW *win, int attrs);
int attron(int attrs);
int wattron(WINDOW *win, int attrs);
int attrset(int attrs);
int wattrset(WINDOW *win, int attrs);
int color_set(short color_pair_number, void* opts);
int wcolor_set(WINDOW *win, short color_pair_number,
void* opts);
int standend(void);
int wstandend(WINDOW *win);
int standout(void);
int wstandout(WINDOW *win);
int attr_get(attr_t *attrs, short *pair, void *opts);
int wattr_get(WINDOW *win, attr_t *attrs, short *pair,
void *opts);
int attr_off(attr_t attrs, void *opts);
int wattr_off(WINDOW *win, attr_t attrs, void *opts);
int attr_on(attr_t attrs, void *opts);
int wattr_on(WINDOW *win, attr_t attrs, void *opts);
int attr_set(attr_t attrs, short pair, void *opts);
int wattr_set(WINDOW *win, attr_t attrs, short pair, void *opts);
int chgat(int n, attr_t attr, short color,
const void *opts)
int wchgat(WINDOW *win, int n, attr_t attr,
short color, const void *opts)
int mvchgat(int y, int x, int n, attr_t attr,
short color, const void *opts)
int mvwchgat(WINDOW *win, int y, int x, int n,
attr_t attr, short color, const void *opts)
DESCRIPTION
These routines manipulate the current attributes of the named window.
The current attributes of a window apply to all characters that are
written into the window with waddch, waddstr and wprintw. Attributes
are a property of the character, and move with the character through
any scrolling and insert/delete line/character operations. To the
extent possible, they are displayed as appropriate modifications to the
graphic rendition of characters put on the screen.
The routine attrset sets the current attributes of the given window to
attrs. The routine attroff turns off the named attributes without
turning any other attributes on or off. The routine attron turns on
the named attributes without affecting any others. The routine
standout is the same as attron(A_STANDOUT). The routine standend is
the same as attrset(A_NORMAL) or attrset(0), that is, it turns off all
attributes.
The attrset and related routines do not affect the attributes used when
erasing portions of the window. See bkgd(3NCURSES) for functions which
modify the attributes used for erasing and clearing.
The routine color_set sets the current color of the given window to the
foreground/background combination described by the color_pair_number.
The parameter opts is reserved for future use, applications must supply
a null pointer.
The routine wattr_get returns the current attribute and color pair for
the given window; attr_get returns the current attribute and color pair
for stdscr. The remaining attr_* functions operate exactly like the
corresponding attr* functions, except that they take arguments of type
attr_t rather than int.
The routine chgat changes the attributes of a given number of
characters starting at the current cursor location of stdscr. It does
not update the cursor and does not perform wrapping. A character count
of -1 or greater than the remaining window width means to change
attributes all the way to the end of the current line. The wchgat
function generalizes this to any window; the mvwchgat function does a
cursor move before acting. In these functions, the color argument is a
color-pair index (as in the first argument of init_pair, see
color(3NCURSES)). The opts argument is not presently used, but is
reserved for the future (leave it NULL).
Attributes
The following video attributes, defined in <curses.h>, can be passed to
the routines attron, attroff, and attrset, or OR’d with the characters
passed to addch.
A_NORMAL Normal display (no highlight)
A_STANDOUT Best highlighting mode of the terminal.
A_UNDERLINE Underlining
A_REVERSE Reverse video
A_BLINK Blinking
A_DIM Half bright
A_BOLD Extra bright or bold
A_PROTECT Protected mode
A_INVIS Invisible or blank mode
A_ALTCHARSET Alternate character set
A_CHARTEXT Bit-mask to extract a character
COLOR_PAIR(n) Color-pair number n
The following macro is the reverse of COLOR_PAIR(n):
PAIR_NUMBER(attrs) Returns the pair number associated
with the COLOR_PAIR(n) attribute.
The return values of many of these routines are not meaningful (they
are implemented as macro-expanded assignments and simply return their
argument). The SVr4 manual page claims (falsely) that these routines
always return 1.
NOTES
Note that attroff, wattroff, attron, wattron, attrset, wattrset,
standend and standout may be macros.
COLOR_PAIR values can only be OR’d with attributes if the pair number
is less than 256. The alternate functions such as color_set can pass a
color pair value directly. However, ncurses ABI 4 and 5 simply OR this
value within the alternate functions. You must use ncurses ABI 6 to
support more than 256 color pairs.
PORTABILITY
These functions are supported in the XSI Curses standard, Issue 4. The
standard defined the dedicated type for highlights, attr_t, which is
not defined in SVr4 curses. The functions taking attr_t arguments are
not supported under SVr4.
The XSI Curses standard states that whether the traditional functions
attron/attroff/attrset can manipulate attributes other than A_BLINK,
A_BOLD, A_DIM, A_REVERSE, A_STANDOUT, or A_UNDERLINE is "unspecified".
Under this implementation as well as SVr4 curses, these functions
correctly manipulate all other highlights (specifically, A_ALTCHARSET,
A_PROTECT, and A_INVIS).
XSI Curses added the new entry points, attr_get, attr_on, attr_off,
attr_set, wattr_on, wattr_off, wattr_get, wattr_set. These are
intended to work with a new series of highlight macros prefixed with
WA_.
Older versions of this library did not force an update of the screen
when changing the attributes. Use touchwin to force the screen to
match the updated attributes.
WA_NORMAL Normal display (no highlight)
WA_STANDOUT Best highlighting mode of the terminal.
WA_UNDERLINE Underlining
WA_REVERSE Reverse video
WA_BLINK Blinking
WA_DIM Half bright
WA_BOLD Extra bright or bold
WA_ALTCHARSET Alternate character set
The XSI curses standard specifies that each pair of corresponding A_
and WA_-using functions operates on the same current-highlight
information.
The XSI standard extended conformance level adds new highlights
A_HORIZONTAL, A_LEFT, A_LOW, A_RIGHT, A_TOP, A_VERTICAL (and
corresponding WA_ macros for each) which this implementation does not
yet support.
RETURN VALUE
All routines return the integer OK on success, or ERR on failure.
X/Open does not define any error conditions.
This implementation returns an error if the window pointer is null.
The wcolor_set function returns an error if the color pair parameter is
outside the range 0..COLOR_PAIRS-1. This implementation also provides
getattrs for compatibility with older versions of curses.
SEE ALSO
ncurses(3NCURSES), addch(3NCURSES), addstr(3NCURSES), bkgd(3NCURSES),
printw(3NCURSES)
attr(3NCURSES)