// -*- C++ -*-
/**
* \file GraphicsLoader.h
- * Copyright 2002 the LyX Team
- * Read the file COPYING
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
*
- * \author Angus Leeming <leeming@lyx.org>
+ * \author Angus Leeming
+ *
+ * Full author contact details are available in file CREDITS
*
* The public face of the graphics cache.
*
* * The user supplies an image file and the display parameters.
* * He can change the file or the display parameters through a reset() method.
* * He must start the loading process explicitly with startLoading().
- * * He receives a statusChanged signal when the loading status changes.
- * * When (status() == Ready), he uses image() to access the loaded image
- * and passes it to the Painter.
+ * * If he is connected through the connect() method, then he'll be informed
+ * when the loading status changes.
+ * * When (status() == Ready), he can use image() to access the loaded image
+ * and pass it to the Painter.
*
* What could be simpler?
*/
#ifndef GRAPHICSLOADER_H
#define GRAPHICSLOADER_H
-#ifdef __GNUG__
-#pragma interface
-#endif
-
#include "GraphicsTypes.h"
#include "LString.h"
#include <boost/signals/signal0.hpp>
#include <boost/scoped_ptr.hpp>
+class Inset;
+class BufferView;
+
namespace grfx {
class Image;
~Loader();
/// The file can be changed, or the display params, or both.
- void reset(string const & file_with_path, DisplayType = ColorDisplay);
+ void reset(string const & file_with_path,
+ DisplayType = ColorDisplay) const;
///
- void reset(string const & file_with_path, Params const &);
+ void reset(string const & file_with_path, Params const &) const;
///
- void reset(Params const &);
+ void reset(Params const &) const;
/// Returns the absolute path of the loaded (loading?) file.
string const & filename() const;
///
bool empty() const { return filename().empty(); }
- /// We are explicit about when we begin the loading process.
- void startLoading();
+ /** starting loading of the image is done by a urgency-based
+ * decision. Here we only call LoaderQueue::touch to request it.
+ */
+ void startLoading() const;
+
+ /** Monitor any changes to the file.
+ * There is no point monitoring the file before startLoading() is
+ * invoked.
+ */
+ void startMonitoring() const;
+ ///
+ bool monitoring() const;
+ /** Returns the check sum of filename() so that, for example, you can
+ * ascertain whether to output a new PostScript version of the file
+ * for a LaTeX run.
+ */
+ unsigned long checksum() const;
/// How far have we got in loading the image?
ImageStatus status() const;
- /// This signal is emitted when the image loading status changes.
- boost::signal0<void> statusChanged;
+ /** Connect and you'll be informed when the loading status of the image
+ * changes.
+ */
+ typedef boost::signal0<void>::slot_type slot_type;
+ ///
+ boost::signals::connection connect(slot_type const &) const;
/** The loaded image with Pixmap set.
* If the Pixmap is not yet set (see status() for why...), returns 0.