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+/*  -*- c++ -*-
+    interfaces/htmlwriter.h
+
+    This file is part of KMail's plugin interface.
+    Copyright (c) 2003 Marc Mutz <mutz@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_HTMLWRITER_H__
+#define __KMAIL_INTERFACES_HTMLWRITER_H__
+
+class QCString;
+class QString;
+
+namespace KMail {
+
+  /**
+   * @short An interface for HTML sinks.
+   * @author Marc Mutz <mutz@kde.org>
+   *
+   */
+  namespace Interface {
+    class HtmlWriter {
+    public:
+      virtual ~HtmlWriter() {}
+
+      /** Signal the begin of stuff to write, and give the CSS definitions */
+      virtual void begin( const QString & cssDefinitions ) = 0;
+      /** Write out a chunk of text. No HTML escaping is performed. */
+      virtual void write( const QString & html ) = 0;
+      /** Signal the end of stuff to write. */
+      virtual void end() = 0;
+    };
+  }
+
+  /**
+   * @short An interface to HTML sinks
+   * @author Marc Mutz <mutz@kde.org>
+   *
+   * @deprecated KMail should be ported to Interface::HtmlWriter. This
+   * interface exposes internal working models. The queueing
+   * vs. writing() issues exposed here should be hidden by using two
+   * different implementations of KHTMLPartHtmlWriter: one for
+   * queueing, and one for writing. This should be fixed before the
+   * release, so we an keep the plugin interface stable.
+   *
+   * Operate this interface in one and only one of the following two
+   * modes:
+   *
+   * @section Sync Mode
+   *
+   * In sync mode, use #begin() to initiate a session, then 
+   * #write() some chunks of HTML code and finally #end() the session.
+   *
+   * @section Async Mode
+   *
+   * In async mode, use #begin() to initialize a session, then
+   * #queue() some chunks of HTML code and finally end the
+   * session by calling #flush().
+   *
+   * Queued HTML code is fed to the html sink using a timer. For this
+   * to work, control must return to the event loop so timer events
+   * are delivered.
+   *
+   * @section Combined mode
+   *
+   * You may combine the two modes in the following way only. Any
+   * number of #write() calls can precede #queue() calls,
+   * but once a chunk has been queued, you @em must @em not
+   * #write() more data, only #queue() it.
+   *
+   * Naturally, whenever you queued data in a given session, that
+   * session must be ended by calling #flush(), not #end().
+   */
+  class HtmlWriter : public Interface::HtmlWriter {
+  public:
+    virtual ~HtmlWriter() {}
+
+    /** Stop all possibly pending processing in order to be able to
+	call #begin() again. */
+    virtual void reset() = 0;
+
+    virtual void queue( const QString & str ) = 0;
+    /** (Start) flushing internal buffers, if any. */
+    virtual void flush() = 0;
+
+    /**
+     * Embed a part with Content-ID @p contentId, using url @p url.
+     */
+    virtual void embedPart( const QCString & contentId, const QString & url ) = 0;
+  };
+
+} // namespace KMail
+
+#endif // __KMAIL_INTERFACES_HTMLWRITER_H__
+