DragAnObject SWI Calls (changes)

» DragAnObject

Bit of text to add the technical details (when added in PRM’s later¹)

DragAnObject is very similar to DragASprite in that it allows a graphic
to be dragged around the screen in place of the pointer. It differs by
allowing an arbitrary graphic as opposed to just a sprite to be dragged.
This is achieved by calling a renderer. The current implementation calls
this renderer twice so that a (possibly irregular) mask can be built on the
fly. This makes it possible to drag icons (using Wimp_PlotSprite as a
renderer), toolbox gadgets, or even draw objects.

¹ Alan Robertson