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Make more robust. E.g. zero length scrollbars.

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svn path=/trunk/netsurf/; revision=12672
This commit is contained in:
Michael Drake 2011-08-27 09:13:23 +00:00
parent 81c52ad494
commit 401072e305
1 changed files with 8 additions and 2 deletions
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10
desktop/scrollbar.c
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@ -105,7 +105,8 @@ bool scrollbar_create(bool horizontal, int length, int full_size,
scrollbar->pair_drag = false;
well_length = length - 2 * SCROLLBAR_WIDTH;
scrollbar->bar_len = (well_length * visible_size) / full_size;
scrollbar->bar_len = (full_size == 0) ? 0 :
((well_length * visible_size) / full_size);
scrollbar->client_callback = client_callback;
scrollbar->client_data = client_data;
@ -467,8 +468,13 @@ void scrollbar_set_extents(struct scrollbar *s, int length,
if (full_size != -1)
s->full_size = full_size;
if (s->full_size < s->visible_size)
s->full_size = s->visible_size;
/* Update scroll offset (scaled in proportion with change in excess) */
s->offset = (s->full_size - s->visible_size) * s->offset / cur_excess;
s->offset = (cur_excess < 1) ? 0 :
((s->full_size - s->visible_size) * s->offset /
cur_excess);
well_length = s->length - 2 * SCROLLBAR_WIDTH;