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clearok(3XCURSES)	X/Open Curses Library Functions	     clearok(3XCURSES)

NAME
       clearok,	 idlok,	 leaveok,  scrollok,  setscrreg, wsetscrreg - terminal
       output control functions

SYNOPSIS
       cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib \
       -R /usr/xpg4/lib -lcurses [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int clearok(WINDOW *win, bool bf);

       int idlok(WINDOW *win, bool bf);

       int leaveok(WINDOW *win, bool bf);

       int scrollok(WINDOW *win, bool bf);

       int setscrreg(int top, int bot);

       int wsetscrreg(WINDOW *win, int top, int bot);

DESCRIPTION
       These functions set options that deal with  the	output	within	Curses
       functions.

       The  clearok()  function assigns the value of bf to an internal flag in
       the specified window that governs  clearing  of	the  screen  during  a
       refresh.	 If,  during  a refresh operation on the specified window, the
       flag in curscr is TRUE or the flag in the  specified  window  is	 TRUE,
       clearok()  clears  the screen, redraws it in its entirety, and sets the
       flag to FALSE in curscr and in the specified window. The initial	 state
       is unspecified

       The  idlok()  function specifies whether the implementation may use the
       hardware insert-line, delete-line, and scroll features of terminals  so
       equipped.  If  bf  is  TRUE, use of these features is enabled. If bf is
       FALSE, use of these features is disabled and lines are instead  redrawn
       as required. The initial state is FALSE.

       The  leaveok()  function	 controls  the cursor position after a refresh
       operation. If bf is TRUE, refresh operations on	the  specified	window
       may  leave  the	terminal's  cursor  at an arbitrary position. If bf is
       FALSE, then at the end of any refresh operation, the terminal's	cursor
       is positioned at the cursor position contained in the specified window.
       The initial state is FALSE.

       The scrollok() function controls the use of scrolling.If	 bf  is	 TRUE,
       then  scrolling	is  enabled  for the specified window. If bf is FALSE,
       scrolling is disabled for the specified window.	The initial  state  is
       FALSE.

       The  setscrreg() and wsetscrreg() functions define a software scrolling
       region in the current or specified window. The top and bottom arguments
       are  the line numbers of the first and last line defining the scrolling
       region. (Line 0 is the top line of the  window.)	 If  this  option  and
       scrollok()  are	enabled,  an  attempt to move off the last line of the
       margin causes all lines in the scrolling region to scroll one  line  in
       the  direction  of  the	first  line. Only characters in the window are
       scrolled.  If a software scrolling region is set and scrollok() is  not
       enabled,	 an  attempt  to move off the last line of the margin does not
       reposition any lines in the scrolling region.

PARAMETERS
       win	       Is a pointer to a window.

       bf	       Is a Boolean expression.

       top	       Is the top line of the scrolling	 region	 (top  of  the
		       window is line 0).

       bot	       Is  the bottom line of the scrolling region (top of the
		       window is line 0).

RETURN VALUES
       Upon successful completion, the setscrreg() and wsetscrreg()  functions
       return OK. Otherwise, they return ERR.

       The other functions always return OK.

ERRORS
       No errors are defined.

 USAGE
	The  only  reason to enable the idlok() feature is to use scrolling to
       achieve the visual effect of motion of a partial window, such as for  a
       screen editor. In other cases, the feature can be visually annoying.

       The  leaveok() option provides greater efficiency for applications that
       do not use the cursor.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │Unsafe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       bkgdset(3XCURSES),	  clear(3XCURSES),	   doupdate(3XCURSES),
       libcurses(3XCURSES), scrl(3XCURSES), attributes(5), standards(5)

SunOS 5.10			  5 Jun 2002		     clearok(3XCURSES)
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