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djvu_viewer.h

//C-  -*- C++ -*-
//C- -------------------------------------------------------------------
//C- DjVuLibre-3.5
//C- Copyright (c) 2002  Leon Bottou and Yann Le Cun.
//C- Copyright (c) 2001  AT&T
//C-
//C- This software is subject to, and may be distributed under, the
//C- GNU General Public License, either Version 2 of the license,
//C- or (at your option) any later version. The license should have
//C- accompanied the software or you may obtain a copy of the license
//C- from the Free Software Foundation at http://www.fsf.org .
//C-
//C- This program is distributed in the hope that it will be useful,
//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//C- GNU General Public License for more details.
//C- 
//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library from
//C- Lizardtech Software.  Lizardtech Software has authorized us to
//C- replace the original DjVu(r) Reference Library notice by the following
//C- text (see doc/lizard2002.djvu and doc/lizardtech2007.djvu):
//C-
//C-  ------------------------------------------------------------------
//C- | DjVu (r) Reference Library (v. 3.5)
//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
//C- | The DjVu Reference Library is protected by U.S. Pat. No.
//C- | 6,058,214 and patents pending.
//C- |
//C- | This software is subject to, and may be distributed under, the
//C- | GNU General Public License, either Version 2 of the license,
//C- | or (at your option) any later version. The license should have
//C- | accompanied the software or you may obtain a copy of the license
//C- | from the Free Software Foundation at http://www.fsf.org .
//C- |
//C- | The computer code originally released by LizardTech under this
//C- | license and unmodified by other parties is deemed "the LIZARDTECH
//C- | ORIGINAL CODE."  Subject to any third party intellectual property
//C- | claims, LizardTech grants recipient a worldwide, royalty-free, 
//C- | non-exclusive license to make, use, sell, or otherwise dispose of 
//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the 
//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU 
//C- | General Public License.   This grant only confers the right to 
//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to 
//C- | the extent such infringement is reasonably necessary to enable 
//C- | recipient to make, have made, practice, sell, or otherwise dispose 
//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to 
//C- | any greater extent that may be necessary to utilize further 
//C- | modifications or combinations.
//C- |
//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//C- +------------------------------------------------------------------
// 
// $Id: djvu_viewer.h,v 1.9 2007/03/25 20:48:23 leonb Exp $
// $Name: debian_version_3_5_20-8 $

#ifndef HDR_DJVU_VIEWER
#define HDR_DJVU_VIEWER
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma interface
#endif


#include "qd_viewer.h"
#include "qd_messenger.h"
#include "DjVuDocument.h"

// It's the file providing the decoding on the fily using or not using
// threads. It has an interface reminding that in Netscape's plugins:
// attach(), detach(), newStream(), etc.

// Please note, that this is the only place where procedures running from
// other threads may be defined (in addition to QDMessenger and DejaVuDecoder)

class DjVuViewerPort : public DjVuPort
{
public:
   class DjVuViewer     * viewer;
   GSafeFlags           disabled;
   
   virtual GP<DataPool> request_data(const DjVuPort * source, const GURL & url);
   virtual bool         notify_error(const DjVuPort * source, const GUTF8String &msg);
   virtual bool         notify_status(const DjVuPort * source, const GUTF8String &msg);

   DjVuViewerPort(class DjVuViewer * v) : viewer(v) {}
};

class DjVuViewer : public QObject, public GPEnabled
{
   Q_OBJECT
private:
   friend class DjVuViewerPort;
   enum CMD { SET_QDVIEWER_DOC };

   QDViewer::PluginData plugin_data;
   int            in_netscape;

   bool           attach_postpone;
   QWidget  * attach_parent;

      // I need to keep copy of the following items here in case
      // if netscape requests detach/attach of the window
   GUTF8String    page_key;

   GP<DjVuViewerPort>   port;
   QDViewer * viewer;
   QDMessenger    messenger;
   
   GP<DjVuDocument>     document;
   GURL                 doc_url;
   GP<DataPool>         doc_pool;

   GP<DataPool>   (* request_data_cb)(const GURL & url, void * cl_data);
   void           * request_data_cl_data;

      // The following functions are just interface to messenger, so that
      // you may call them from any thread
   void           getURL(const GURL & url, const GUTF8String &target);
   void           showStatus(const QString &msg);
   void           showError(const GUTF8String &title, const GUTF8String &msg);
   GP<DataPool>   requestData(const GURL & url);
private slots:
   void           slotViewerDestroyed(void);
   void           slotShowError(const GUTF8String &, const GUTF8String &);
protected:
   virtual bool   eventFilter(QObject * obj, QEvent * ev);
signals:
   void           sigGetURL(const GURL & url, const GUTF8String &target);
   void           sigShowStatus(const QString &msg);
public:
   void           attach(QWidget * parent);
   void           detach(void);
   void           newStream(const GURL & URL, const GP<DataPool> & pool);
   SavedData      getSavedData(void);

   QDViewer *     getQDViewer(void) const { return viewer; }
   GP<DjVuDocument> getDjVuDocument(void) const { return document; };

   void           setRequestDataCB(GP<DataPool> (*)(const GURL &, void *), void *);
   
   DjVuViewer(int in_netscape, const QDViewer::PluginData & pdata);
   ~DjVuViewer(void);
};

inline void
DjVuViewer::setRequestDataCB(GP<DataPool> (* cb)(const GURL &, void *), void * data)
{
   request_data_cb=cb;
   request_data_cl_data=data;
}

inline void
DjVuViewer::getURL(const GURL & url, const GUTF8String &target)
{
   messenger.getURL(url, target);
}

inline void
DjVuViewer::showStatus(const QString &msg)
{
   messenger.showStatus(msg);
}

inline void
DjVuViewer::showError(const GUTF8String &title, const GUTF8String &msg)
{
   messenger.showError(title, msg);
}

#endif

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