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Move lines into the history when scrolling even if the scroll region is not

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the entire screen.

Allows ircII users to see history, prompted by naddy.
This commit is contained in:
Nicholas Marriott
2009-10-13 15:38:37 +00:00
parent 71dc6e04e8
commit ad566a86de
3 changed files with 75 additions and 20 deletions
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70
grid.c
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@ -161,29 +161,77 @@ grid_compare(struct grid *ga, struct grid *gb)
return (0);
}
/* Scroll a line into the history. */
/*
* Collect lines from the history if at the limit. Free the top (oldest) 10%
* and shift up.
*/
void
grid_scroll_line(struct grid *gd)
grid_collect_history(struct grid *gd)
{
u_int yy;
GRID_DEBUG(gd, "");
if (gd->hsize >= gd->hlimit) {
/* If the limit is hit, free the bottom 10% and shift up. */
yy = gd->hlimit / 10;
if (yy < 1)
yy = 1;
if (gd->hsize < gd->hlimit)
return;
grid_move_lines(gd, 0, yy, gd->hsize + gd->sy - yy);
gd->hsize -= yy;
}
yy = gd->hlimit / 10;
if (yy < 1)
yy = 1;
grid_move_lines(gd, 0, yy, gd->hsize + gd->sy - yy);
gd->hsize -= yy;
}
/*
* Scroll the entire visible screen, moving one line into the history. Just
* allocate a new line at the bottom and move the history size indicator.
*/
void
grid_scroll_history(struct grid *gd)
{
u_int yy;
GRID_DEBUG(gd, "");
yy = gd->hsize + gd->sy;
gd->linedata = xrealloc(gd->linedata, yy + 1, sizeof *gd->linedata);
memset(&gd->linedata[yy], 0, sizeof gd->linedata[yy]);
gd->hsize++;
}
/* Scroll a region up, moving the top line into the history. */
void
grid_scroll_history_region(struct grid *gd, u_int upper, u_int lower)
{
struct grid_line *gl_history, *gl_upper, *gl_lower;
u_int yy;
GRID_DEBUG(gd, "upper=%u, lower=%u", upper, lower);
/* Create a space for a new line. */
yy = gd->hsize + gd->sy;
gd->linedata = xrealloc(gd->linedata, yy + 1, sizeof *gd->linedata);
/* Move the entire screen down to free a space for this line. */
gl_history = &gd->linedata[gd->hsize];
memmove(gl_history + 1, gl_history, gd->sy * sizeof *gl_history);
/* Adjust the region and find its start and end. */
upper++;
gl_upper = &gd->linedata[upper];
lower++;
gl_lower = &gd->linedata[lower];
/* Move the line into the history. */
memcpy(gl_history, gl_upper, sizeof *gl_history);
/* Then move the region up and clear the bottom line. */
memmove(gl_upper, gl_upper + 1, (lower - upper) * sizeof *gl_upper);
memset(gl_lower, 0, sizeof *gl_lower);
/* Move the history offset down over the line. */
gd->hsize++;
}