daveray/seesaw — pull request #138 by davesann (2013-05-07 01:10:18+00:00)
Title: modified :import option on default-transfer-handler to allow checking of data before accepting import

As per discussion https://github.com/daveray/seesaw/pull/137

:import

- can now accept either a function (as before)
- or a map {:on-drop (fn {data] ...)
:can-drop? (fn {data] ...)}