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diff --git a/kmail/rulewidgethandlermanager.h b/kmail/rulewidgethandlermanager.h
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+/*  -*- mode: C++; c-file-style: "gnu" -*-
+    rulewidgethandlermanager.h
+
+    This file is part of KMail, the KDE mail client.
+    Copyright (c) 2004 Ingo Kloecker <kloecker@kde.org>
+
+    KMail 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.
+
+    KMail 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
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of this program with any edition of
+    the Qt library by Trolltech AS, Norway (or with modified versions
+    of Qt that use the same license as Qt), and distribute linked
+    combinations including the two.  You must obey the GNU General
+    Public License in all respects for all of the code used other than
+    Qt.  If you modify this file, you may extend this exception to
+    your version of the file, but you are not obligated to do so.  If
+    you do not wish to do so, delete this exception statement from
+    your version.
+*/
+
+#ifndef __KMAIL_RULEWIDGETHANDLERMANAGER_H__
+#define __KMAIL_RULEWIDGETHANDLERMANAGER_H__
+
+#include "kmsearchpattern.h"
+
+#include <qvaluevector.h>
+
+class QObject;
+class QCString;
+class QString;
+class QWidgetStack;
+
+namespace KMail {
+
+  class RuleWidgetHandler;
+
+  /**
+   * @short Singleton to manage the list of RuleWidgetHandlers
+   */
+  class RuleWidgetHandlerManager {
+    static RuleWidgetHandlerManager * self;
+
+    RuleWidgetHandlerManager();
+  public:
+    ~RuleWidgetHandlerManager();
+
+    static RuleWidgetHandlerManager * instance() {
+      if ( !self )
+	self = new RuleWidgetHandlerManager();
+      return self;
+    }
+
+    void registerHandler( const RuleWidgetHandler * handler );
+    void unregisterHandler( const RuleWidgetHandler * handler );
+
+    void createWidgets( QWidgetStack *functionStack,
+                        QWidgetStack *valueStack,
+                        const QObject *receiver ) const;
+    KMSearchRule::Function function( const QCString & field,
+                                     const QWidgetStack *functionStack ) const;
+    QString value( const QCString & field,
+                   const QWidgetStack *functionStack,
+                   const QWidgetStack *valueStack ) const;
+    QString prettyValue( const QCString & field,
+                         const QWidgetStack *functionStack,
+                         const QWidgetStack *valueStack ) const;
+    bool handlesField( const QCString & field,
+                       const QWidgetStack *functionStack,
+                       const QWidgetStack *valueStack ) const;
+    void reset( QWidgetStack *functionStack,
+                QWidgetStack *valueStack ) const;
+    void setRule( QWidgetStack *functionStack,
+                  QWidgetStack *valueStack,
+                  const KMSearchRule *rule ) const;
+    void update( const QCString & field,
+                 QWidgetStack *functionStack,
+                 QWidgetStack *valueStack ) const;
+
+  private:
+    typedef QValueVector<const RuleWidgetHandler*>::const_iterator const_iterator;
+    typedef QValueVector<const RuleWidgetHandler*>::iterator iterator;
+
+    QValueVector<const RuleWidgetHandler*> mHandlers;
+  };
+
+} // namespace KMail
+
+#endif // __KMAIL_RULEWIDGETHANDLERMANAGER_H__