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diff --git a/kbruch/src/mainqtwidget.h b/kbruch/src/mainqtwidget.h
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+/***************************************************************************
+                          mainqtwidget.h  -  The main Qt/KDE window
+                             -------------------
+    begin                : Tue Mar 16 00:00:00 CET 2003
+    copyright            : (C) 2003-2004 by Sebastian Stein
+    email                : seb.kde@hpfsc.de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   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 MAINQTWIDGET_H
+#define MAINQTWIDGET_H
+
+#include <kmainwindow.h>
+
+
+class KJanusWidget;
+class KWidgetAction;
+
+class QLabel;
+
+class ExerciseCompare;
+class ExerciseConvert;
+class ExerciseFactorize;
+class StatisticsView;
+class TaskView;
+
+/** Constructs the main window and presents the user interface.
+ *  The window is seperated into 2 sections. In the left section is the
+ *  statistic view and in the right section the task view.
+ *  \author Sebastian Stein
+ *  \author Eva Brucherseifer
+ **/
+class MainQtWidget : public KMainWindow
+{
+	Q_OBJECT
+			  
+	public:
+		/** constructor */
+		MainQtWidget();
+
+		/** destructor */
+		~MainQtWidget();
+
+	private:
+		/** read the config file */
+		void readOptions();
+
+		/** read the config file */
+		void writeOptions();
+		
+		/** pointing to the statistics view */
+		StatisticsView * m_statview;
+
+		/** the iconlist for the different exercises */
+		KJanusWidget * m_exercises;
+
+		/** pointing to the exercise solving a task with fractions; added as page
+		 * to the iconlist */
+		TaskView * m_taskview;
+
+		/** pointing to the exercise comparing ratios; added as page to the
+		 * iconlist */ 
+		ExerciseCompare * m_exerciseCompare;
+
+		/** pointing to the exercise convert rational number; added as page to the
+		 * iconlist */ 
+		ExerciseConvert * m_exerciseConvert;
+
+		/** pointing to the exercise factorize a given number; added as page to
+		 * the iconlist */ 
+		ExerciseFactorize * m_exerciseFactorize;
+		
+		bool m_addSub;
+		bool m_mulDiv;
+		unsigned int m_nrRatios;
+		unsigned int m_maxMainDenominator;
+
+		void setupActions();
+
+		QComboBox * m_NrOfTermsBox;
+		QLabel * m_NrOfTermsLabel;
+		KWidgetAction * m_NrOfTermsBoxAction;
+		KWidgetAction * m_NrOfTermsLabelAction;
+
+		QComboBox * m_MaxMainDenominatorBox;
+		QLabel * m_MaxMainDenominatorLabel;
+		KWidgetAction * m_MaxMainDenominatorBoxAction;
+		KWidgetAction * m_MaxMainDenominatorLabelAction;
+
+		QComboBox * m_OperationBox;
+		QLabel * m_OperationLabel;
+		KWidgetAction * m_OperationBoxAction;
+		KWidgetAction * m_OperationLabelAction;
+
+		KAction * m_NewTaskAction;
+
+	private slots:
+		/** 
+		 * called to force generation of a new task 
+		 */
+		void NewTask();
+		/** 
+		 * called when the user changes the number of terms in the ComboBox 
+		 */
+		void NrOfTermsBoxSlot();
+		/** 
+		 *called, when the user changes the max. size of the main denominator in
+ 		 * the ComboBox 
+		 */
+		void MaxMainDenominatorBoxSlot();
+		/** 
+		 * called, when the user changes the wished task's operations 
+		 */
+		void OperationBoxSlot();
+
+		/**
+		 * calls the settings dialog
+		 */
+		void slotPrefs();
+
+		/**
+		 * makes sure, all parts of the UI update to new settings
+		 */
+		void slotApplySettings();
+
+		/**
+		 * called just before another page is shown
+		 */
+		void slotAboutToShowPage(QWidget * page);
+
+	protected:
+		/** Function is called when user calls termination.
+		 *  Used to save the current statistics and settings before exiting.
+		 **/
+		bool queryExit();
+};
+
+#endif // MainQtWidget