bool ScrollBar::Set(int apagepos) {
int op = pagepos;
pagepos = apagepos;
if(pagepos > totalsize - pagesize) pagepos = totalsize - pagesize;
if(pagepos < 0) pagepos = 0;
int slsize = GetRange();
int mint = max(minthumb, style->thumbmin);
if(totalsize <= 0)
SetThumb(0, slsize);
else {
double thumbsize = slsize * pagesize / (double) totalsize;
double rest = slsize * pagesize - thumbsize * totalsize;
double ts, ps;
if(thumbsize >= slsize || thumbsize < 0) {
ts = slsize;
ps = 0;
}
else
if(thumbsize <= mint) {
ps = ((slsize - mint) * (double)pagepos + rest) / (double) (totalsize - pagesize);
ts = mint;
}
else {
ps = (slsize * (double)pagepos + rest) / (double) totalsize;
ts = thumbsize;
}
SetThumb(ffloor(ps), fceil(ts));
}
if(pagepos != op) {
Refresh();
WhenScroll();
return true;
}
return false;
}
/* ARGSUSED */
static void
VerticalScroll(Widget w, XtPointer client_data, XtPointer call_data)
{
int pos = (int)(long) call_data;
int new_line; /* The new location for the line pointer. */
ScrollByLineWidget sblw = (ScrollByLineWidget) XtParent(w);
new_line = sblw->scroll.line_pointer + (pos / sblw->scroll.font_height);
(void) ScrollVerticalText( (Widget) sblw, new_line, FALSE);
SetThumb( (Widget) sblw);
}
/* ARGSUSED */
static void
VerticalJump(Widget w, XtPointer junk, XtPointer percent_ptr)
{
float percent = *((float *) percent_ptr);
int new_line; /* The new location for the line pointer. */
ScrollByLineWidget sblw = (ScrollByLineWidget) XtParent(w);
new_line = (int) ((float) sblw->scroll.lines * percent);
if (ScrollVerticalText( (Widget) sblw, new_line, FALSE))
SetThumb((Widget) sblw);
}
void ScrollBar::Drag(Point p) {
if(SetThumb(max(0, IsHorz() ? p.x - delta : p.y - delta), thumbsize) && track)
Position();
}
