/***************************************************************************
                              exercisecompare.h
                             -------------------
    begin                : 2004/06/03
    copyright            : (C) 2004 by Sebastian Stein
    email                : seb.kde@hpfsc.de

    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo@ltia.fc.unesp.br
    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque@ltia.fc.unesp.br
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef EXERCISECOMPARE_H
#define EXERCISECOMPARE_H

#define DEBUG

#ifdef DEBUG
#include <kdebug.h>
#endif

#include "exercisebase.h"
#include "ratio.h"
#include "ratiowidget.h"
#include "resultwidget.h"
//Added by qt3to4:
#include <QLabel>
#include <QVBoxLayout>
#include <QGridLayout>

class QGridLayout;
class QLabel;
class QPushButton;
class QVBoxLayout;


#include <qwidget.h>

/*! Constructs a QWidget, which shows the task to the user.
 *  The class also provides input fields, so that the user can enter the result.
 *  It also controls the interaction, so that the entered result gets checked
 *  and a new task can be generated.
 *  \author Sebastian Stein
 * */
class ExerciseCompare : public ExerciseBase
{
	Q_OBJECT

public:
	/** constructor */
	ExerciseCompare(QWidget * parent = 0);

	/** destructor */
	~ExerciseCompare();

	/** force the creation of a new task */
	void forceNewTask();

	void setQuestionMixed(bool value);

public slots:
	void update();

signals:
	/** class emits this signal, if the task was solved correctly by the user */
	void signalExerciseSolvedCorrect();

	/** class emits this signal, if the task was skipped by the user */
	void signalExerciseSkipped();

	/** class emits this signal, if the task was solved not correctly by the user
	 * */
	void signalExerciseSolvedWrong();

private:
	short m_currentState;

	bool m_questionMixed;

	RatioWidget * m_firstRatioWidget;
	RatioWidget * m_secondRatioWidget;
	
	// Buttons to select the comparison
	QPushButton * m_skipButton;
	QPushButton * m_moreButton;
	QPushButton * m_minorButton;
	QPushButton * m_equalButton;

	ratio m_firstRatio;
	ratio m_secondRatio;

	// Layout Structures
	QGridLayout * checkLayout;
	QGridLayout * taskLayout;
	QGridLayout * baseGrid;

	enum SignButtonState
	{
		lessThen,
		greaterThen,
		equalTo
	};
	SignButtonState m_signButtonState;

	QWidget * checkWidget;
	QWidget * taskWidget;

	ResultWidget* m_resultWidget;

	void createTask();
	void showResult();
	void nextTask();

private slots:
	void slotSkipButtonClicked();
	void slotMinorButtonClicked();
	void slotMoreButtonClicked();
	void slotEqualButtonClicked();
};

#endif
