UAN: Example 1b

USER ACTION FEEDBACK SYSTEM STATE

mouse_down(x,y) if intersect(object,x,y)

object = selected

then highlight(object)

drag_icon(x,y)* show_outline(object)

if intersect(target,x,y)

then highlight(target)

mouse_up(x’,y’) if intersect(target ,x’,y’)

then hide(object)

intersect_action(target)

else draw(object)

Generic drag and drop interaction: action depends on target