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Add support for the SD (scroll down) escape sequence, GitHub issue 1861.

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This commit is contained in:
nicm
2019-08-05 06:42:02 +00:00
parent c4744620af
commit 45f4ff5485
5 changed files with 76 additions and 4 deletions
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25
screen-write.c
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@@ -1088,6 +1088,31 @@ screen_write_scrollup(struct screen_write_ctx *ctx, u_int lines, u_int bg)
ctx->scrolled += lines;
}
/* Scroll down. */
void
screen_write_scrolldown(struct screen_write_ctx *ctx, u_int lines, u_int bg)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct tty_ctx ttyctx;
u_int i;
screen_write_initctx(ctx, &ttyctx);
ttyctx.bg = bg;
if (lines == 0)
lines = 1;
else if (lines > s->rlower - s->rupper + 1)
lines = s->rlower - s->rupper + 1;
for (i = 0; i < lines; i++)
grid_view_scroll_region_down(gd, s->rupper, s->rlower, bg);
screen_write_collect_flush(ctx, 0);
ttyctx.num = lines;
tty_write(tty_cmd_scrolldown, &ttyctx);
}
/* Carriage return (cursor to start of line). */
void
screen_write_carriagereturn(struct screen_write_ctx *ctx)