Re: Scrolling Problem with Ncurses

[Thomas Dickey]

On Sun, 19 Apr 2009, Krt_Malta wrote:

> Hi,
>
> I am using Ncurses to develop a text editor in C. I am successfully
> scrolling up and down by using, wscrl(stdscr,1); and wscrl(stdscr,-1);
> respectively. However, for example, when I scroll down one line, the first
> line in the terminal clears ok but when I scroll back up, the first line
> does not reappear. It scrolls up, but it gives me an empty line instead.

curses does that - though a quick check of man wscrl doesn't show it 
mentioned til the "NOTES" section.

The application is supposed to fill in the text after the scrolling 
operation.

You can use a pad (see newpad) to store a larger "window" than the actual 
display - this simplifies some of it, but requires some computation to 
keep track of the viewport.

There's an example in the ncurses program (test/ncurses.c in the sources)
which uses a pad.

--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net