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Full Discussion: scrolling cursor
Top Forums Shell Programming and Scripting scrolling cursor Post 302227007 by otheus on Wednesday 20th of August 2008 11:25:47 AM
Old 08-20-2008
There's simple and complex.

The simple method is to add a check for ever piece of code that might output data. But if you rely on a sub-process that might never return, this doesn't work too well.

The complex method is to set up a timer and trap the timer with something that outputs to the screen. The trap can check a variable before printing; that variable is reset every time there is output.

This demonstrates (in BASH) the basic concept:

Code:
wake_up() { 
echo "++ Waiting for more input ++" 
}

trap wake_up SIGALRM
( while true; do kill -SIGALRM $$; sleep 30; done ) &

date
sleep 90;
date
sleep 90;
date

 

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LEARN ABOUT SUNOS

idlok

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 argu-
       ments 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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