/* EXTPROTO */
int
rxvt_scrollbar_update (rxvt_t* r, int update)
{
int ret = 0;
int top, bot, len, adj;
if (!rxvt_scrollbar_visible(r))
return 0;
if (update) {
/* first line in the view */
top = (AVTS(r)->nscrolled - AVTS(r)->view_start);
/* last line in the view */
bot = top + (r->TermWin.nrow - 1);
/* total lines in scroll and view */
len = max((AVTS(r)->nscrolled + (r->TermWin.nrow - 1)), 1);
adj = (((bot - top) * scrollbar_size()) % len) > 0 ? 1 : 0;
/*
** scrollBar.beg : beginning of scrollbar, always 0
** scrollBar.end : end of scrollbar excluding buttons
** scrollbar_size : scrollbar length excluding minimal height
**
** scrollBar.top : beginning of scroller
** scrollBar.bot : end of scroller
** scroller_len : length of scroller
*/
r->scrollBar.top = (r->scrollBar.beg + (top * scrollbar_size()) / len);
r->h->scroller_len = ((bot - top) * scrollbar_size()) / len +
scrollbar_minheight() + adj;
r->scrollBar.bot = (r->scrollBar.top + r->h->scroller_len);
/* no change */
if (r->scrollBar.top == r->h->last_top &&
r->scrollBar.bot == r->h->last_bot &&
(r->scrollBar.state == r->h->last_state ||
!scrollbar_isUpDn()))
return 0;
}
ret = r->scrollBar.update(r, update, r->h->last_top, r->h->last_bot,
r->h->scroller_len);
r->h->last_top = r->scrollBar.top;
r->h->last_bot = r->scrollBar.bot;
r->h->last_state = r->scrollBar.state;
return ret;
}
/* EXTPROTO */
int
rxvt_scrollbar_show(rxvt_t *r, int update)
{
int ret = 0;
#ifdef HAVE_SCROLLBARS
int top, bot, len, adj;
if (!scrollbar_visible(r))
return 0;
if (update) {
top = (r->TermWin.nscrolled - r->TermWin.view_start);
bot = top + (r->TermWin.nrow - 1);
len = max((r->TermWin.nscrolled + (r->TermWin.nrow - 1)), 1);
adj = (((bot - top) * scrollbar_size()) % len) > 0 ? 1 : 0;
r->scrollBar.top = (r->scrollBar.beg + (top * scrollbar_size()) / len);
r->h->scrollbar_len = ((bot - top) * scrollbar_size()) / len +
scrollbar_minheight() + adj;
r->scrollBar.bot = (r->scrollBar.top + r->h->scrollbar_len);
/* no change */
if (r->scrollBar.top == r->h->last_top
&& r->scrollBar.bot == r->h->last_bot
&& (r->scrollBar.state == r->h->last_state || !scrollbar_isUpDn()))
return 0;
}
ret = r->scrollBar.update(r, update, r->h->last_top, r->h->last_bot,
r->h->scrollbar_len);
r->h->last_top = r->scrollBar.top;
r->h->last_bot = r->scrollBar.bot;
r->h->last_state = r->scrollBar.state;
#endif
return ret;
}
