can-move-to? (augmentable only) in pasteboard%

Called before a snip is moved in the editor. If the return value is #f, then the move will be aborted.

See also on-move-to and after-move-to.

The editor is internally locked for writing when this method is called (see also Locks).

• (send a-pasteboard can-move-to? snip x y dragging?) -> boolean
     snip : snip% object
     x : real number
     y : real number
     dragging? : boolean

  If dragging? is not #f, then this move is a temporary move for dragging.