Scroll Over		by Bob Ebert

Demonstrates scrolling of views (clPictureViews in this case) using two methods.


Method one uses a custom scrolling control which calls SetOrigin() on a clipping
view to move the contents of the view around.  The clipping window also has a
viewClickScript which tracks the pen and scrolls the contents as the user drags.
(The view method :Drag() isnÕt equipped to do this.)

The dragging is interesting and perhaps useful, as long as you donÕt need to click
on the scrolled contents or write over them.  ItÕs also non-intuitive, and should
only be used in conjunction with a scroller control.

The scroller control itself has several things hardcoded that might better be
gotten dynamically.  It was not intended as a generic scrolling utility, but
rather an example to illustrate how to do local scrolling of a view.

In the sample, the scroller control bitmap for the top window comes from a
resource file.  This image is available in the system rom, and could be gotten
at runtime via ROM_canonicalCompass.icon.  (This wonÕt evaluate at compile time!)
I chose to stick with a resource so that the controll image could be swapped.


Method two uses the proto that the Newton electronic book reader has provided
to do all the work.  This is handy, because you have to do almost nothing to
make a view scroll.  With this method, you need to do the following:

	set the scrolledView slot in the canonicalCompass control to the view
		to be scrolled.
	make sure the view to be scrolled has the following slots:
		dataBounds (a viewBounds slot which controls scrolling limits)
		viewOriginX
		viewOriginY
		
In the sample code, all these are done within the viewSetupDoneScript of the
picture view which is scrolled.

This is probably the preferred method, since itÕs so lightweight in RAM and
programming requirements, plus it guarantees a consistent user interface.


Note that the top example will scroll diagonally using the scroller controll,
while the bottom one (using the book proto) doesnÕt.  <shrug>

						--Bob