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+/*  -*- mode: C++; c-file-style: "gnu" -*-
+    interfaces/rulewidgethandler.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_INTERFACES_RULEWIDGETHANDLER_H__
+#define __KMAIL_INTERFACES_RULEWIDGETHANDLER_H__
+
+#include "../kmsearchpattern.h"
+
+class QWidget;
+class QWidgetStack;
+class QCString;
+class QString;
+class QObject;
+
+namespace KMail {
+  /**
+   * @short An interface to filter/search rule widget handlers
+   */
+  class RuleWidgetHandler {
+  public:
+    virtual ~RuleWidgetHandler() {}
+
+    virtual QWidget * createFunctionWidget( int number,
+                                            QWidgetStack *functionStack,
+                                            const QObject *receiver ) const = 0;
+    virtual QWidget * createValueWidget( int number,
+                                         QWidgetStack *valueStack,
+                                         const QObject *receiver ) const = 0;
+    virtual KMSearchRule::Function function( const QCString & field,
+                                             const QWidgetStack *functionStack ) const = 0;
+    virtual QString value( const QCString & field,
+                           const QWidgetStack *functionStack,
+                           const QWidgetStack *valueStack ) const = 0;
+    virtual QString prettyValue( const QCString & field,
+                                 const QWidgetStack *functionStack,
+                                 const QWidgetStack *valueStack ) const = 0;
+    virtual bool handlesField( const QCString & field ) const = 0;
+    virtual void reset( QWidgetStack *functionStack,
+                        QWidgetStack *valueStack ) const = 0;
+    virtual bool setRule( QWidgetStack *functionStack,
+                          QWidgetStack *valueStack,
+                          const KMSearchRule *rule ) const = 0;
+    virtual bool update( const QCString & field,
+                         QWidgetStack *functionStack,
+                         QWidgetStack *valueStack ) const = 0;
+
+  };
+
+} // namespace KMail
+
+#endif // __KMAIL_INTERFACES_RULEWIDGETHANDLER_H__
+