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+// Copyright (C) 2011, Gabriel Dos Reis.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     - Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//
+//     - Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in
+//       the documentation and/or other materials provided with the
+//       distribution.
+//
+//     - Neither the name of OpenAxiom. nor the names of its contributors
+//       may be used to endorse or promote products derived from this
+//       software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef OPENAXIOM_CONVERSATION_INCLUDED
+#define OPENAXIOM_CONVERSATION_INCLUDED
+
+#include <QFrame>
+#include <QLineEdit>
+#include <QLabel>
+#include <QFont>
+#include <vector>
+
+namespace OpenAxiom {
+   // A conversation is a set of exchanges.  An exchange is a question
+   // followed by an answer.  A conversation that takes place in a
+   // a certain frame is a debate.
+   class Debate;
+   class Conversation;
+   class Exchange;
+   class Question;
+   class Answer;
+
+   // -- A question is just a one-liner query.
+   class Question : public QLineEdit {
+   public:
+      explicit Question(Exchange&);
+   };
+
+   class Answer : public QLabel {
+   public:
+      explicit Answer(Exchange&);
+   };
+   
+   // -- Elemental conversation widget
+   // -- A basic interaction consists of a query, a reply, and the
+   // -- the type of the reply.
+   class Exchange : public QFrame {
+      Q_OBJECT;
+   public:
+      Exchange(Conversation&, int);
+
+      // Return the parent widget of this conversation topic
+      Conversation* conversation();
+      Debate* debate();
+      
+      // The widget holding the query area
+      Question* question() { return &query; }
+      const Question* question() const { return &query; }
+
+      // The widget holding the reply area.
+      Answer* answer() { return &reply; }
+      const Answer* answer() const { return &reply; }
+
+      // Conversion number
+      int number() const { return no; }
+
+      // Reimplement positiion management.
+      QSize sizeHint() const;
+      QSize minimumSizeHint() const;
+
+   protected:
+      // void resizeEvent(QResizeEvent*);
+
+   private:
+      const int no;
+      Question query;
+      Answer reply;
+
+   private slots:
+      void reply_to_query();
+   };
+
+   // -- Set of conversations that make up a session.
+   // -- We remember and number each topic so that we
+   // -- can go back in the conversation set and reevaluate
+   // -- queries.
+   class Conversation : public QWidget {
+      Q_OBJECT;
+   public:
+      explicit Conversation(Debate&);
+      ~Conversation();
+
+      // Holds if this conversation just started.
+      bool fresh() const { return children.empty(); }
+
+      // Number of exchanges in this conversation
+      int length() const { return children.size(); }
+
+      // Return the `i'-th conversation in this set, if any.
+      Exchange* operator[](int) const;
+
+      // Start a new conversation topic.
+      Exchange* new_topic();
+
+      // Override QWidegt::sizeHint.  Return the cumulative sizes
+      // of all conversations so far.
+      QSize sizeHint() const;
+
+      // Return the parent engine widget.
+      Debate* debate() { return &group; }
+
+   public slots:
+      // Return the topic following a given topic in this set of conversations
+      Exchange* next(Exchange*);
+      
+   private:
+      typedef std::vector<Exchange*> Children;
+      Debate& group;
+      Children children;
+   };
+   
+   // Default number of characters per question line.
+   const int question_columns = 80;
+
+   QFont monospace_font();
+   QSize em_metrics(const QFont&);
+}
+
+#endif  // OPENAXIOM_CONVERSATION_INCLUDED
+
+
+// Local Variables:
+// mode: c++
+// End: