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Change to match xterm's resizing behaviour, including pushing lines into the

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history from the top when reducing vertical size and pulling them again when
increasing size.
This commit is contained in:
Nicholas Marriott 2009-06-25 16:02:10 +00:00
parent 944520b3a8
commit e6e1b45fa1
1 changed files with 47 additions and 33 deletions
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80
screen.c
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@ -1,4 +1,4 @@
/* $OpenBSD: screen.c,v 1.3 2009/06/04 18:48:24 nicm Exp $ */
/* $OpenBSD: screen.c,v 1.4 2009/06/24 19:12:44 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -169,38 +169,42 @@ void
screen_resize_y(struct screen *s, u_int sy)
{
struct grid *gd = s->grid;
u_int oy, yy, ny;
u_int needed, available, oldy, i;
if (sy == 0)
fatalx("zero size");
oldy = screen_size_y(s);
/*
* When resizing:
*
* If the height is decreasing, delete lines from the bottom until
* hitting the cursor, then push lines from the top into the history.
*
* When increasing, pull as many lines as possible from the history to
* the top, then fill the remaining with blanks at the bottom.
*/
/* Size decreasing. */
if (sy < screen_size_y(s)) {
oy = screen_size_y(s);
if (sy < oldy) {
needed = oldy - sy;
if (s->cy != 0) {
/*
* The cursor is not at the start. Try to remove as
* many lines as possible from the top. (Up to the
* cursor line.)
*/
ny = s->cy;
if (ny > oy - sy)
ny = oy - sy;
grid_view_delete_lines(gd, 0, ny);
s->cy -= ny;
oy -= ny;
/* Delete as many lines as possible from the bottom. */
available = oldy - 1 - s->cy;
if (available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, oldy - available, available);
}
needed -= available;
if (sy < oy) {
/* Remove any remaining lines from the bottom. */
grid_view_delete_lines(gd, sy, oy - sy);
if (s->cy >= sy)
s->cy = sy - 1;
}
}
/*
* Now just increase the history size to take over the lines
* which are left. XXX Should apply history limit?
*/
gd->hsize += needed;
s->cy -= needed;
}
/* Resize line arrays. */
gd->size = xrealloc(gd->size, gd->hsize + sy, sizeof *gd->size);
@ -209,18 +213,28 @@ screen_resize_y(struct screen *s, u_int sy)
gd->udata = xrealloc(gd->udata, gd->hsize + sy, sizeof *gd->udata);
/* Size increasing. */
if (sy > screen_size_y(s)) {
oy = screen_size_y(s);
for (yy = gd->hsize + oy; yy < gd->hsize + sy; yy++) {
gd->size[yy] = 0;
gd->data[yy] = NULL;
gd->usize[yy] = 0;
gd->udata[yy] = NULL;
if (sy > oldy) {
needed = sy - oldy;
/* Try to pull as much as possible out of the history. */
available = gd->hsize;
if (available > 0) {
if (available > needed)
available = needed;
gd->hsize -= available;
s->cy += available;
}
needed -= available;
/* Then fill the rest in with blanks. */
for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++) {
gd->size[i] = gd->usize[i] = 0;
gd->data[i] = gd->udata[i] = NULL;
}
}
/* Set the new size, and reset the scroll region. */
gd->sy = sy;
s->rupper = 0;
s->rlower = screen_size_y(s) - 1;
}