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.TH Sx_ScrollbarGetRange sx
.BS
.NA
Sx_ScrollbarGetRange, Sx_ScrollbarSetRange \- read and write the range of a scrollbar
.SY
#include <X/Xlib.h>
#include <sx.h>
.sp
Sx_ScrollbarGetRange(\fIscrollbar, topPtr, bottomPtr\fP)
.sp
Sx_ScrollbarSetRange(\fIwindow, top, bottom\fP)
.AR
.AS Window *bottomPtr
.AP Window window in
Window whose associated scrollbar's range is to be queried or set.
Should have been either the return value from a prior Sx_ScrollbarCreate
call or the \fIwindow\fP parameter to a prior Sx_ScrollbarMake call.
.AP float *topPtr out
Location in which to store location of top (or left) edge of view
relative to overall object size.
.AP float *bottomPtr out
Location in which to store location of bottom (or right) edge of view
relative to overall document size.
.AP float top in
New value for top (left) edge of scrollbar range.
.AP float bottom in
New value for bottom (right) edge of scrollbar range.
.BE

.SH DESCRIPTION
.PP
These two procedures allow callers to query and change the range
displayed in the ``elevator'' of the scrollbar associated with
\fIwindow\fP.  The range
of a scrollbar is indicated by two values, \fItop\fP and \fIbottom\fP,
both between 0.0 and 1.0 inclusive.  
For example, if \fItop\fP was 0.0 and \fIbottom\fP
was 0.5, it would mean that the top half of the object is visible in
the window.  For a horizontal scrollbar, it would mean that the left
half of the object is visible in the window.  The elevator displayed
in the scrollbar has its top (or left) edge \fItop\fP of the way along
the length of the scrollbar, and its bottom (or right) edge \fIbottom\fP
of the way along the length of the scrollbar.
.PP
Sx_ScrollbarSetRange does not affect in any way the view in the
window associated with the scrollbar;  all it does is update the
range of the elevator drawn in the scrollbar to reflect the new
values of \fItop\fP and \fIbottom\fP.  It is up to the caller to
make sure that the range of the scrollbar and the view in the
associated window remain consistent.

.SH KEYWORDS
range, scrollbar, window