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diff --git a/kcalc/kcalc_button.h b/kcalc/kcalc_button.h
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+++ b/kcalc/kcalc_button.h
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+/*
+    KCalc, a scientific calculator for the X window system using the
+    Qt widget libraries, available at no cost at http://www.troll.no
+
+    Copyright (C) 1996 Bernd Johannes Wuebben
+                       wuebben@math.cornell.edu
+
+    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.
+
+    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, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+*/
+
+#ifndef _KCALC_BUTTON_H
+#define _KCALC_BUTTON_H
+
+#include <kpushbutton.h>
+
+// The class KCalcButton is an overriden KPushButton. It offers extra
+// functionality e.g. labels can be richtext or the accels can be
+// shown in the label, but the most important thing is that the button
+// may have several modes with corresponding labels. When one switches
+// modes, the corresponding label is displayed.
+
+
+enum ButtonModeFlags {ModeNormal = 0, ModeInverse = 1, ModeHyperbolic = 2};
+
+class QDomNode;
+
+// Each kcalc button can be in one of several modes.
+// The following class describes label, tooltip etc. for each mode...
+class ButtonMode
+{
+public:
+  ButtonMode(void) {};
+  ButtonMode(QString &label, QString &tooltip, bool is_label_richtext)
+    : is_label_richtext(is_label_richtext), tooltip(tooltip)
+  {
+    if (is_label_richtext)
+      this->label = "<qt type=\"page\"><center>" + label + "</center></qt>";
+    else
+      this->label = label;
+  };
+
+  QString label;
+  bool is_label_richtext;
+  QString tooltip;
+};
+
+
+class KCalcButton : public KPushButton
+{
+Q_OBJECT
+
+public:
+ KCalcButton(QWidget *parent, const char * name = 0); 
+ KCalcButton(const QString &label, QWidget *parent, const char * name = 0,
+	     const QString &tooltip = QString());
+
+ void addMode(ButtonModeFlags mode, QString label, QString tooltip, bool is_label_richtext = false);
+
+public slots: 
+  void slotSetMode(ButtonModeFlags mode, bool flag); 
+  void slotSetAccelDisplayMode(bool flag);
+
+protected:
+ virtual void drawButtonLabel(QPainter *paint);
+ void paintLabel(QPainter *paint);
+
+protected:
+ bool _show_accel_mode;
+ QString _label;
+
+ ButtonModeFlags _mode_flags;
+
+ QMap<ButtonModeFlags, ButtonMode> _mode;
+};
+
+class KSquareButton : public KCalcButton
+{
+Q_OBJECT
+
+public:
+  KSquareButton(QWidget *parent, const char * name = 0)
+    : KCalcButton(parent, name) { }; 
+ KSquareButton(const QString &label, QWidget *parent, const char * name = 0,
+	       const QString &tooltip = QString())
+   : KCalcButton(label, parent, name, tooltip) { };
+
+protected:
+ virtual void drawButtonLabel(QPainter *paint);
+ void paintLabel(QPainter *paint);
+};
+
+#endif  // _KCALC_BUTTON_H