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Store and restore cursor across reflow by working out a position based

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on unwrapped lines, rather than a grid offset. Fixes problems reported
by Thomas Sattler and Paul de Weerd.
This commit is contained in:
nicm
2019-04-02 08:45:32 +00:00
parent 792fcb1dbf
commit ffa4d48967
3 changed files with 51 additions and 30 deletions
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69
grid.c
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@ -1291,40 +1291,61 @@ grid_reflow(struct grid *gd, u_int sx)
free(target);
}
/* 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)
/* Convert to position based on wrapped lines. */
void
grid_wrap_position(struct grid *gd, u_int px, u_int py, u_int *wx, u_int *wy)
{
u_int yy, offset = 0;
u_int ax = 0, ay = 0, yy;
if (py > gd->hsize + gd->sy - 1) {
px = UINT_MAX;
py = gd->hsize + gd->sy - 1;
for (yy = 0; yy < py; yy++) {
if (gd->linedata[yy].flags & GRID_LINE_WRAPPED)
ax += gd->linedata[yy].cellused;
else {
ax = 0;
ay++;
}
}
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);
if (px >= gd->linedata[yy].cellused)
ax = UINT_MAX;
else
ax += px;
*wx = ax;
*wy = ay;
}
/* Convert offset from the start of the grid to point position. */
/* Convert position based on wrapped lines back. */
void
grid_from_offset(struct grid *gd, u_int offset, u_int *px, u_int *py)
grid_unwrap_position(struct grid *gd, u_int *px, u_int *py, u_int wx, u_int wy)
{
u_int yy;
*px = *py = 0;
u_int yy, ax = 0, ay = 0;
for (yy = 0; yy < gd->hsize + gd->sy - 1; yy++) {
if (offset <= gd->linedata[yy].cellused)
if (ay == wy)
break;
offset -= gd->linedata[yy].cellused;
if (gd->linedata[yy].flags & GRID_LINE_WRAPPED)
ax += gd->linedata[yy].cellused;
else {
ax = 0;
ay++;
}
}
if (offset < gd->linedata[yy].cellused)
*px = offset;
else
*px = gd->linedata[yy].cellused;
/*
* yy is now 0 on the unwrapped line which contains wx. Walk forwards
* until we find the end or the line now containing wx.
*/
if (wx == UINT_MAX) {
while (gd->linedata[yy].flags & GRID_LINE_WRAPPED)
yy++;
wx = gd->linedata[yy].cellused;
} else {
while (gd->linedata[yy].flags & GRID_LINE_WRAPPED) {
if (wx < gd->linedata[yy].cellused)
break;
wx -= gd->linedata[yy].cellused;
yy++;
}
}
*px = wx;
*py = yy;
}