INTERFACE BooleanPropPrivate;

IMPORT GraphicsBase, Prop, PropPrivate;

FROM BooleanProp IMPORT Base, Name, PublicName, Val, PublicVal, Beh, PublicBeh;

REVEAL
  Name <: PrivateName;

TYPE
  PrivateName = PublicName OBJECT
  METHODS
    init (default : Base) : Name;
    getState (base : GraphicsBase.T) : Base;
  END;

REVEAL
  Val <: PrivateVal;

TYPE
  PrivateVal = PublicVal OBJECT
    val : Base;     (* The cache is updated by calling "adjust". *)
  END;

REVEAL
  Beh <: PrivateBeh;

TYPE
  PrivateBeh = PublicBeh OBJECT
  METHODS
    value (time : LONGREAL) : Base RAISES {Prop.BadMethod};
  END;

TYPE
  Stack <: PublicStack;
  PublicStack = PropPrivate.Stack OBJECT
    top : Base;
  METHODS
    push (val : Base);
    pop () : Base;
  END;

END BooleanPropPrivate.