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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
2009-07-13 10:43:52 +00:00
parent 0b788a3d61
commit 359285928b
6 changed files with 153 additions and 9 deletions
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46
grid.c
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@@ -95,6 +95,8 @@ grid_create(u_int sx, u_int sy, u_int hlimit)
gd->sx = sx;
gd->sy = sy;
gd->flags = GRID_HISTORY;
gd->hsize = 0;
gd->hlimit = hlimit;
@@ -517,3 +519,47 @@ grid_string_cells(struct grid *gd, u_int px, u_int py, u_int nx)
buf[off] = '\0';
return (buf);
}
/*
* Duplicate a set of lines between two grids. If there aren't enough lines in
* either source or destination, the number of lines is limited to the number
* available.
*/
void
grid_duplicate_lines(
struct grid *dst, u_int dy, struct grid *src, u_int sy, u_int ny)
{
u_int yy;
GRID_DEBUG(src, "dy=%u, sy=%u, ny=%u", dy, sy, ny);
if (dy + ny > dst->hsize + dst->sy)
ny = dst->hsize + dst->sy - dy;
if (sy + ny > src->hsize + src->sy)
ny = src->hsize + src->sy - sy;
grid_clear_lines(dst, dy, ny);
for (yy = 0; yy < ny; yy++) {
dst->size[dy] = src->size[sy];
if (src->size[sy] == 0)
dst->data[dy] = NULL;
else {
dst->data[dy] = xcalloc(
src->size[sy], sizeof **dst->data);
memcpy(dst->data[dy], src->data[sy],
src->size[sy] * (sizeof **dst->data));
}
dst->usize[dy] = src->usize[sy];
if (src->usize[sy] == 0)
dst->udata[dy] = NULL;
else {
dst->udata[sy] = xcalloc(
src->usize[sy], sizeof **dst->udata);
memcpy(dst->udata[dy], src->udata[sy],
src->usize[sy] * (sizeof **dst->udata));
}
sy++; dy++;
}
}