Screen dragging is definately feasible in software, and could
be reasonably quick in performance if it uses hardware aspects
of most video cards. However even the simplest
implementation would require changing the way that a given
screen is displayed either all the time or as a drag starts so
that it can be blitted lower on the screen and screens behind
it blitted onto the larger or smaller frontmost resolution.
Actually I only ever found it useful in two occasions:
1. Writing a game where the lower quartile of the screen
was a hi-res screen providing the button bar, inventory
and text feedback ( recognise the game yet? )
2. Dragging back and forth QUICKLY to look at a bit of code
or map data behind the current screen.
Any other uses for such obscure functionality?
Now screen real-estate is getting so large I am beginning
to find dragging the mouse to the top of the screen to select
menus a pain and the pop up menu in magic-menu clashes with
some of my apps.
