EZ_GetDnDDragSrcXYOffset - return the location of the mouse pointer relative to
the upper left corner of the drag
#include <EZ.h>
void EZ_GetDnDDragSrcXYOffset(int *x_return, int *y_return)
x_return,
y_return Specify the return for the XY offset.
EZ_GetDnDDragSrcXYOffset returns the location of the mouse pointer
relative to the upper-left corner of the dragged object. If DnD is not
currently active, it returns the offset corresponding to the previous drag.
EZ_GetDnDDropLocation(3),EZ_WidgetAddDnDDataEncoder(3)