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Manage visible ranges when drawing scrollbars.

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This commit is contained in:
Michael Grant
2025-10-21 09:13:33 +01:00
parent 379e4d976c
commit 72dbbfedce
1 changed files with 21 additions and 1 deletions
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22
screen-redraw.c
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@@ -917,6 +917,22 @@ screen_redraw_draw_status(struct screen_redraw_ctx *ctx)
}
}
static int
screen_redraw_is_visible(struct visible_ranges *ranges, u_int px)
{
struct visible_range *vr;
u_int r;
vr = ranges->array;
for (r=0; r<ranges->n; r++) {
if (vr[r].nx == 0)
continue;
if ((px >= vr[r].px) && (px <= vr[r].px + vr[r].nx))
return (1);
}
return (0);
}
/* Construct ranges of line at px,py of width cells of base_wp that are
unobsructed. */
struct visible_ranges *
@@ -1179,6 +1195,7 @@ screen_redraw_draw_scrollbar(struct screen_redraw_ctx *ctx,
int px, py, ox = ctx->ox, oy = ctx->oy;
int sx = ctx->sx, sy = ctx->sy, xoff = wp->xoff;
int yoff = wp->yoff;
struct visible_ranges *visible_ranges;
/* Set up style for slider. */
gc = sb_style->gc;
@@ -1195,12 +1212,15 @@ screen_redraw_draw_scrollbar(struct screen_redraw_ctx *ctx,
for (j = 0; j < jmax; j++) {
py = sb_y + j;
visible_ranges = screen_redraw_get_visible_ranges(wp, sb_x, py,
imax);
for (i = 0; i < imax; i++) {
px = sb_x + i;
if (px < xoff - ox - (int)sb_w - (int)sb_pad ||
px >= sx || px < 0 ||
py < yoff - oy - 1 ||
py >= sy || py < 0)
py >= sy || py < 0 ||
! screen_redraw_is_visible(visible_ranges, px))
continue;
tty_cursor(tty, px, py);
if ((sb_pos == PANE_SCROLLBARS_LEFT &&