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diff --git a/kmail/callback.h b/kmail/callback.h
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+/*  -*- c++ -*-
+    callback.h
+
+    This file is used by KMail's plugin interface.
+    Copyright (c) 2004 Bo Thorsen <bo@sonofthor.dk>
+
+    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 CALLBACK_H
+#define CALLBACK_H
+
+#include <qstring.h>
+
+class KMMessage;
+class KMReaderWin;
+
+#include <kdepimmacros.h>
+
+
+#include <libkcal/attendee.h> // only for an enum, we are not linking
+
+
+namespace KMail {
+
+/** This class is used for callback hooks needed by bodypart
+    formatter plugins. It also holds a pointer to the message we are
+    working on.
+    Feel free to put whatever you want in here. It's not supposed to be
+    a nicely formatted class, but simply include everything necessary
+    for the plugins. */
+class KDE_EXPORT Callback {
+public:
+  Callback( KMMessage* msg, KMReaderWin* readerWin );
+
+  /** Get the full message */
+  KMMessage* getMsg() const { return mMsg; }
+
+  /** Mail a message
+   * @ param status can be accepted/cancel/tentative/delegated
+   */
+  bool mailICal( const QString &to, const QString &iCal,
+                 const QString &subject, const QString &status,
+                 bool delMessage = true ) const;
+
+  /** Get the receiver of the mail */
+  QString receiver() const;
+
+  /** Returns the sender of the mail. */
+  QString sender() const;
+
+  /** Close the main window showing this message, if it's a secondary window. */
+  void closeIfSecondaryWindow() const;
+
+  bool askForComment( KCal::Attendee::PartStat status ) const;
+  bool deleteInvitationAfterReply() const;
+
+private:
+  KMMessage* mMsg;
+  KMReaderWin* mReaderWin;
+  mutable QString mReceiver;
+  mutable bool mReceiverSet;
+};
+
+}
+
+#endif /* CALLBACK_H */
+