lyx_mirror/src/graphics/GraphicsConverter.h

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// -*- C++ -*-
/**
* \file GraphicsConverter.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Angus Leeming
*
* Full author contact details are available in file CREDITS.
*
* The controller of a conversion process from file AA of format A to
* file BB of format B.
* Once finished, a signal is emitted to inform any listeners (connected
* through the connect() method).
*/
#ifndef GRAPHICSCONVERTER_H
#define GRAPHICSCONVERTER_H
#include <boost/scoped_ptr.hpp>
#include <boost/signal.hpp>
#include <boost/utility.hpp>
namespace lyx {
namespace graphics {
class Converter : boost::noncopyable {
public:
/// Can the conversion be performed?
static bool isReachable(std::string const & from_format_name,
std::string const & to_format_name);
/** One Converter per conversion ensures that the (hidden) signal
* is always connected to the expected slot.
*/
Converter(std::string const & from_file, std::string const & to_file_base,
std::string const & from_format, std::string const & to_format);
/// Define an empty d-tor out-of-line to keep boost::scoped_ptr happy.
~Converter();
/// We are explicit about when we begin the conversion process.
void startConversion() const;
/** Connect and you'll be informed when the conversion process has
* finished.
* If the conversion is succesful, then the listener is passed \c true.
*/
typedef boost::signal<void(bool)> sig_type;
typedef sig_type::slot_type slot_type;
///
boost::signals::connection connect(slot_type const &) const;
/** If the conversion is succesful, this returns the name of the
* resulting file.
* If conversion fails or has not been completed, however, it
* returns an empty string.
*/
std::string const & convertedFile() const;
private:
/// Use the Pimpl idiom to hide the internals.
class Impl;
/// The pointer never changes although *pimpl_'s contents may.
boost::scoped_ptr<Impl> const pimpl_;
};
} // namespace graphics
} // namespace lyx
#endif // GRAPHICSCONVERTER_H