[plt-scheme] 'grabbing' the canvas/pasteboard? to scroll with the mouse pointer

Thanks, at least I know where to look.

I have also been looking at 'wxs_madm.cc'  specifically;
> static Scheme_Object * os_wxMediaAdminScrollTo (int n , Scheme_Object * p
[] ) {

I'm having trouble making sense of it because I have no experience in c++,
and the code lacks any comments.

Is there any documentation to this stuff.

s.



On Jan 18, 2008 2:14 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:

> At Thu, 17 Jan 2008 15:44:20 +0000, "Stephen De Gabrielle" wrote:
> > I'm trying to implement a 'grab and scroll' method that lets the
> > canvas be moved by the mouse pointer.
> >
> > I'm pretty happy with getting the location via   get-x  get-y and
> > dc-location-to-editor-location,
> > but I'm trying to find an alternative to the 'scroll-to' to actually
> > do the moving?
> >
> > (The idea is that while the left mouse button is down, the mouse
> > position is static with respect to the pasteboard position, but moves
> > with respect to the canvas.)
>
> I think there's isn't really an alternative to `scroll-to'. The
> `scroll-to' method of a pasteboard mostly just sends on the request to
> its administrator's `scroll-to' method, which is the only interface for
> talking about the relative position of the editor in the display.
>
> Matthew
>
>


-- 
Cheers,

Stephen

--
Stephen De Gabrielle
s.degabrielle at ucl.ac.uk
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