QuestionDialog is a dialog for Question.

questiondialog.h


//---------------------------------------------------------------------------

/*

QuestionDialog, dialog for Question

Copyright (C) 2011 Richel Bilderbeek



This program 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 3 of the License, or

(at your option) any later version.



This program 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 this program.If not, see <http://www.gnu.org/licenses/>.

*/

//---------------------------------------------------------------------------

//From http://www.richelbilderbeek.nl/CppQtQuestionDialog.htm

//---------------------------------------------------------------------------

#ifndef QUESTIONDIALOG_H

#define QUESTIONDIALOG_H

//---------------------------------------------------------------------------

#include <boost/checked_delete.hpp>

#include <boost/shared_ptr.hpp>

//---------------------------------------------------------------------------

struct Question;

//---------------------------------------------------------------------------

///Dialog for an Question

struct QuestionDialog

{

  QuestionDialog(const boost::shared_ptr<Question>& question);



  ///Check if an answer can be submitted

  bool CanSubmit() const { return !m_has_submitted; }



  ///Get all possible correct answers

  const std::vector<std::string> GetCorrectAnswers() const;



  ///Obtain the question

  boost::shared_ptr<Question> GetQuestion() const { return m_question; }



  ///Obtain the version

  static const std::string GetVersion();



  ///Obtain the version history

  static const std::vector<std::string> GetVersionHistory();



  ///Check if an answer has been submitted

  bool HasSubmitted() const { return m_has_submitted; }



  ///See if the submitted answer is correct

  bool IsAnswerCorrect() const;



  ///(Re)set the Question

  //void SetQuestion(const Question * const question);

  void SetQuestion(const boost::shared_ptr<Question>& question);



  ///Submit an answer

  void Submit(const std::string& s);



  protected:

  virtual ~QuestionDialog() {}

  friend void boost::checked_delete<>(QuestionDialog*);



  private:

  ///The question

  boost::shared_ptr<Question> m_question;



  ///Has the user already submitted an answer?

  bool m_has_submitted;



  ///Was the submitted answer correct?

  bool m_is_correct;

};

//---------------------------------------------------------------------------

#endif // OPENQUESTIONDIALOG_H

questiondialog.cpp


//---------------------------------------------------------------------------

/*

QuestionDialog, dialog for Question

Copyright (C) 2011 Richel Bilderbeek



This program 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 3 of the License, or

(at your option) any later version.



This program 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 this program.If not, see <http://www.gnu.org/licenses/>.

*/

//---------------------------------------------------------------------------

//From http://www.richelbilderbeek.nl/CppQtQuestionDialog.htm

//---------------------------------------------------------------------------

#include "openquestion.h"

#include "openquestiondialog.h"

//---------------------------------------------------------------------------

QuestionDialog::QuestionDialog(const boost::shared_ptr<Question>& question)

  : m_has_submitted(false),

    m_is_correct(false)

{

  SetQuestion(question);



  if (question)

  {

    assert(CanSubmit());

    assert(!HasSubmitted());

    assert(GetQuestion());

  }

}

//---------------------------------------------------------------------------

const std::string QuestionDialog::GetVersion()

{

  return "1.0";

}

//---------------------------------------------------------------------------

const std::vector<std::string> QuestionDialog::GetVersionHistory()

{

  std::vector<std::string> v;

  v.push_back("2011-06-29: version 1.0: initial version");

  return v;

}

//---------------------------------------------------------------------------

///See if the submitted answer is correct

bool QuestionDialog::IsAnswerCorrect() const

{

  assert(HasSubmitted());

  return m_is_correct;

}

//---------------------------------------------------------------------------

///Set the Question

void QuestionDialog::SetQuestion(const boost::shared_ptr<Question>& question)

{

  assert(question);

  if (question && question.get() != m_question.get())

  {

    m_question = question;

    m_has_submitted = false;

  }

}

//---------------------------------------------------------------------------

///Submit an answer

void QuestionDialog::Submit(const std::string& s)

{

  assert(CanSubmit());



  m_is_correct = m_question->IsCorrect(s);



  m_has_submitted = true;

  assert(!CanSubmit());

}

//---------------------------------------------------------------------------

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(C++) QuestionDialog

questiondialog.h

questiondialog.cpp