on-drop-file

For platforms that support drag-and-drop, this method is called when the user drags a file onto the window. Drag-and-drop must first be enabled for the window with accept-drop-files.

Under MacOS, when the user double-clicks on a MrEd file or drags a file onto the MrEd icon, the on-drop-file method of the frontmost frame is called (if drag-and-drop is enabled for that frame).

• (send a-frame:basic-mixin on-drop-file pathname) -> void
      pathname : string

  Calls handler:edit-file with pathname as an argument.