(*
    Copyright (C) 2003-19 Richard Bornat & Bernard Sufrin
     
        richard@bornat.me.uk
        sufrin@comlab.ox.ac.uk

    This file is part of the jape proof engine, which is part of jape.

    Jape is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    Jape is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with jape; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    (or look at http://www.gnu.org).

*)

type box          = Box.box
 and displayclass = Displayclass.displayclass
 and element      = Termtype.element
 and 'a hit       = 'a Hit.hit
 and hitkind      = Hit.hitkind
 and path         = Prooftree.Tree.Fmttree.path
 and pos          = Box.pos
 and prooftree    = Prooftree.Tree.Fmttree.prooftree

type displaystaterec =
      { showProof         : prooftree -> box -> path option -> path option -> displaystate;
        showFocussedProof : prooftree -> box -> path option -> displaystate;
        refreshProof      : unit -> unit;
        printProof        : out_channel -> prooftree -> path option -> path option -> unit;
        locateHit         : pos -> displayclass option -> hitkind -> path hit option;
        locateElement     : element -> pos list;
        refineSelection   : bool;
        notifyselect      : (pos * displayclass) option -> (pos * displayclass) list -> unit;
        storedProof       : unit -> prooftree option 
      }

 and displaystate = DisplayState of displaystaterec


