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Support "alternate screen" mode (terminfo smcup/rmcup) typically used by full

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screen interactive programs to preserve the screen contents. When activated, it
saves a copy of the visible grid and disables scrolling into and resizing out
of the history; when deactivated the visible data is restored and the history
reenabled.
This commit is contained in:
Nicholas Marriott
2009-07-14 06:40:33 +00:00
parent f41ef2198b
commit e63567d51c
6 changed files with 159 additions and 15 deletions
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28
screen.c
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@ -1,4 +1,4 @@
/* $Id: screen.c,v 1.91 2009-07-12 17:03:11 nicm Exp $ */
/* $Id: screen.c,v 1.92 2009-07-14 06:40:33 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -173,10 +173,20 @@ screen_resize_y(struct screen *s, u_int sy)
needed -= available;
/*
* Now just increase the history size to take over the lines
* which are left. XXX Should apply history limit?
* Now just increase the history size, if possible, to take
* over the lines which are left. If history is off, delete
* lines from the top.
*
* XXX Should apply history limit?
*/
gd->hsize += needed;
available = s->cy;
if (gd->flags & GRID_HISTORY)
gd->hsize += needed;
else if (available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, 0, available);
}
s->cy -= needed;
}
@ -190,14 +200,18 @@ screen_resize_y(struct screen *s, u_int sy)
if (sy > oldy) {
needed = sy - oldy;
/* Try to pull as much as possible out of the history. */
/*
* Try to pull as much as possible out of the history, if is
* is enabled.
*/
available = gd->hsize;
if (available > 0) {
if (gd->flags & GRID_HISTORY && available > 0) {
if (available > needed)
available = needed;
gd->hsize -= available;
s->cy += available;
}
} else
available = 0;
needed -= available;
/* Then fill the rest in with blanks. */