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Improve cursor positioning after reflow by storing the position as an

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offset into the entire history before reflow and restoring it aftewards.
This commit is contained in:
nicm
2019-03-20 19:19:11 +00:00
parent ed962e7612
commit 9ee1a8f701
3 changed files with 79 additions and 72 deletions
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85
grid.c
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@ -1030,7 +1030,7 @@ grid_reflow_move(struct grid *gd, struct grid_line *from)
/* Join line below onto this one. */
static void
grid_reflow_join(struct grid *target, struct grid *gd, u_int sx, u_int yy,
u_int width, u_int *cy, int already)
u_int width, int already)
{
struct grid_line *gl, *from = NULL;
struct grid_cell gc;
@ -1128,11 +1128,7 @@ grid_reflow_join(struct grid *target, struct grid *gd, u_int sx, u_int yy,
grid_reflow_dead(&gd->linedata[i]);
}
/* Adjust cursor and scroll positions. */
if (*cy > to + lines)
*cy -= lines;
else if (*cy > to)
*cy = to;
/* Adjust scroll position. */
if (gd->hscrolled > to + lines)
gd->hscrolled -= lines;
else if (gd->hscrolled > to)
@ -1142,7 +1138,7 @@ grid_reflow_join(struct grid *target, struct grid *gd, u_int sx, u_int yy,
/* Split this line into several new ones */
static void
grid_reflow_split(struct grid *target, struct grid *gd, u_int sx, u_int yy,
u_int at, u_int *cy)
u_int at)
{
struct grid_line *gl = &gd->linedata[yy], *first;
struct grid_cell gc;
@ -1195,9 +1191,7 @@ grid_reflow_split(struct grid *target, struct grid *gd, u_int sx, u_int yy,
memcpy(first, gl, sizeof *first);
grid_reflow_dead(gl);
/* Adjust the cursor and scroll positions. */
if (yy <= *cy)
(*cy) += lines - 1;
/* Adjust the scroll position. */
if (yy <= gd->hscrolled)
gd->hscrolled += lines - 1;
@ -1206,24 +1200,17 @@ grid_reflow_split(struct grid *target, struct grid *gd, u_int sx, u_int yy,
* in the last new line, try to join with the next lines.
*/
if (width < sx && (flags & GRID_LINE_WRAPPED))
grid_reflow_join(target, gd, sx, yy, width, cy, 1);
grid_reflow_join(target, gd, sx, yy, width, 1);
}
/* Reflow lines on grid to new width. */
void
grid_reflow(struct grid *gd, u_int sx, u_int *cursor)
grid_reflow(struct grid *gd, u_int sx)
{
struct grid *target;
struct grid_line *gl;
struct grid_cell gc;
u_int yy, cy, width, i, at, first;
struct timeval start, tv;
gettimeofday(&start, NULL);
log_debug("%s: %u lines, new width %u", __func__, gd->hsize + gd->sy,
sx);
cy = gd->hsize + (*cursor);
u_int yy, width, i, at, first;
/*
* Create a destination grid. This is just used as a container for the
@ -1277,7 +1264,7 @@ grid_reflow(struct grid *gd, u_int sx, u_int *cursor)
* it was previously wrapped.
*/
if (width > sx) {
grid_reflow_split(target, gd, sx, yy, at, &cy);
grid_reflow_split(target, gd, sx, yy, at);
continue;
}
@ -1286,7 +1273,7 @@ grid_reflow(struct grid *gd, u_int sx, u_int *cursor)
* of the next line.
*/
if (gl->flags & GRID_LINE_WRAPPED)
grid_reflow_join(target, gd, sx, yy, width, &cy, 0);
grid_reflow_join(target, gd, sx, yy, width, 0);
else
grid_reflow_move(target, gl);
}
@ -1300,20 +1287,42 @@ grid_reflow(struct grid *gd, u_int sx, u_int *cursor)
free(gd->linedata);
gd->linedata = target->linedata;
free(target);
/*
* Update scrolled and cursor positions.
*/
if (gd->hscrolled > gd->hsize)
gd->hscrolled = gd->hsize;
if (cy < gd->hsize)
*cursor = 0;
else
*cursor = cy - gd->hsize;
gettimeofday(&tv, NULL);
timersub(&tv, &start, &tv);
log_debug("%s: now %u lines (in %llu.%06u seconds)", __func__,
gd->hsize + gd->sy, (unsigned long long)tv.tv_sec,
(u_int)tv.tv_usec);
}
/* Convert point position to offset from the start of the grid. */
u_int
grid_to_offset(struct grid *gd, u_int px, u_int py)
{
u_int yy, offset = 0;
if (py > gd->hsize + gd->sy - 1) {
px = UINT_MAX;
py = gd->hsize + gd->sy - 1;
}
for (yy = 0; yy < py; yy++)
offset += gd->linedata[yy].cellused;
if (px > gd->linedata[yy].cellused)
px = gd->linedata[yy].cellused;
return (offset + px);
}
/* Convert offset from the start of the grid to point position. */
void
grid_from_offset(struct grid *gd, u_int offset, u_int *px, u_int *py)
{
u_int yy;
*px = *py = 0;
for (yy = 0; yy < gd->hsize + gd->sy - 1; yy++) {
if (offset <= gd->linedata[yy].cellused)
break;
offset -= gd->linedata[yy].cellused;
}
if (offset < gd->linedata[yy].cellused)
*px = offset;
else
*px = gd->linedata[yy].cellused;
*py = yy;
}